Patent Publication Number: US-2022238060-A1

Title: Display method and display system

Description:
The present application is based on, and claims priority from JP Application Serial Number 2021-011077, filed Jan. 27, 2021, the disclosure of which is hereby incorporated by reference herein in its entirety. 
     BACKGROUND 
     1. Technical Field 
     The present disclosure relates to a display method and a display system. 
     2. Related Art 
     International Publication No. WO 2017/179272 (Document 1) discloses an information processing device which displays a simulation image related to an appearance of a projection image projected from a projector. The simulation image shows an image of a room where the projector is located, and the projection image. The information processing device changes the transmittance of the projection image to thereby simulate the brightness of the projection image. 
     The visibility of the projection image is not decided only by the brightness of the projection image in some cases. Therefore, it is difficult for the user to imagine the actual visibility of the projection image when looking at the simulation image displayed by the information processing device described in Document 1. 
     SUMMARY 
     A display method according to an aspect of the present disclosure includes the steps of obtaining a target image showing a target region including a surface, displaying a simulation image on a display, the simulation image being obtained by superimposing a display image on the target image, the display image corresponding to an image to be projected by a projector on the surface, displaying the target image included in the simulation image on the display with a brightness based on first information configured to designate a brightness of the target region, and displaying the display image included in the simulation image on the display with a brightness based on second information configured to designate a brightness of the display image. 
     A display system according to another aspect of the present disclosure includes a camera, a display, and at least one processor, wherein the at least one processor executes the steps of obtaining a target image showing a target region including a surface using the camera, making the display display a simulation image, the simulation image being obtained by superimposing a display image on the target image, the display image corresponding to an image to be projected by a projector on the surface, making the display display the target image included in the simulation image with a brightness based on first information configured to designate a brightness of the target region, and making the display display the display image included in the simulation image with a brightness based on second information configured to designate a brightness of the display image. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a diagram showing an information processing device  1 . 
         FIG. 2  is a diagram showing a front surface  1   a  of the information processing device  1 . 
         FIG. 3  is a diagram showing a back surface  1   b  of the information processing device  1 . 
         FIG. 4  is a diagram showing an example of a target image H 1 . 
         FIG. 5  is a diagram showing an example of the information processing device  1 . 
         FIG. 6  is a diagram showing an example of a virtual space VS. 
         FIG. 7  is a flowchart for explaining recognition of a wall E 1 . 
         FIG. 8  is a flowchart for explaining display of a first simulation image G 1 . 
         FIG. 9  is a flowchart for explaining an operation of changing the brightness of the first simulation image G 1 . 
         FIG. 10  is a diagram showing an example of an icon i displayed on a touch panel  12 . 
         FIG. 11  is a diagram showing an example of a first guide image t 1 . 
         FIG. 12  is a diagram showing an example of the information processing device  1  displaying the target image H 1 . 
         FIG. 13  is a diagram showing an example of an image u 1 . 
         FIG. 14  is a diagram showing an example of an image u 2 . 
         FIG. 15  is a diagram showing an example of an image u 3 . 
         FIG. 16  is a diagram showing a situation in which the information processing device  1  is shaken by the user. 
         FIG. 17  is a diagram showing an example of an image u 4 . 
         FIG. 18  is a diagram showing another example of the image u 4 . 
         FIG. 19  is a diagram showing still another example of the image u 4 . 
         FIG. 20  is a diagram showing still another example of the image u 4 . 
         FIG. 21  is a diagram showing still another example of the image u 4 . 
         FIG. 22  is a diagram showing an example of an image u 5 . 
         FIG. 23  is a diagram showing another example of the image u 5 . 
         FIG. 24  is a diagram showing still another example of the image u 5 . 
         FIG. 25  is a diagram showing still another example of the image u 5 . 
         FIG. 26  is a diagram showing still another example of the image u 5 . 
         FIG. 27  is a diagram showing an example of a menu image v 4 . 
         FIG. 28  is a diagram showing an example of image candidates v 8 . 
         FIG. 29  is a diagram showing an example of an image u 6 . 
         FIG. 30  is a diagram showing another example of the image u 6 . 
         FIG. 31  is a diagram showing an example of an image u 7 . 
         FIG. 32  is a diagram showing another example of the image u 7 . 
         FIG. 33  is a diagram showing an example of a mask v 16 . 
         FIG. 34  is a diagram showing an example of an image u 8 . 
     
    
    
     DESCRIPTION OF AN EXEMPLARY EMBODIMENT 
     A: First Embodiment 
     A1: Outline of Information Processing Device  1   
       FIG. 1  is a diagram showing an information processing device  1 . The information processing device  1  is a smartphone. The information processing device  1  is not limited to the smartphone, but can also be, for example, a tablet with a camera, a laptop PC (Personal Computer) with a camera, or a laptop PC to which a camera is coupled. The information processing device  1  is an example of a display system. The information processing device  1  is located in a real space RS. 
     The real space RS includes a projector  2 , a wall E 1 , a ceiling E 2 , and a floor E 3  in addition to the information processing device  1 . The position of the projector  2  in the real space RS is not limited to the position shown in  FIG. 1 , but can arbitrarily be changed. 
     The wall E 1  is a vertical plane. The wall E 1  is not limited to the vertical plane, but is sufficiently a plane crossing a horizontal plane. The wall E 1  is an inside wall of a building. The wall E 1  is not limited to the inside wall of the building, but can be, for example, an outside wall of the building. At least a part of the wall E 1  is an example of a plane. The plane is not limited to at least a part of the wall E 1 , but can also be, for example, at least a part of the ceiling E 2 , at least a part of the floor E 3 , a screen, a whiteboard, or a door. The plane is included in a target region TR. 
     The target region TR is included in the real space RS. The position of the target region TR in the real space RS is not limited to the position shown in  FIG. 1 , but can arbitrarily be changed. 
     The projector  2  projects a projection image F 1  on the wall E 1  using light. The information processing device  1  displays a first simulation image G 1  related to an appearance of the projection image F 1 . 
     The information processing device  1  includes a front surface  1   a , a back surface  1   b , a camera  11 , and a touch panel  12 .  FIG. 2  is a diagram showing the front surface  1   a  of the information processing device  1 .  FIG. 3  is a diagram showing the back surface  1   b  of the information processing device  1 . 
     The camera  11  is located on the back surface  1   b  of the information processing device  1 . The camera  11  takes an image of an imaging region. The imaging region of the camera  11  moves in accordance with a movement of the information processing device  1 . 
     The imaging region of the camera  11  is used as the target region TR. Therefore, the target region TR moves in accordance with a movement of the information processing device  1 . The camera  11  takes the image of the target region TR in the state in which the projector  2  does not project the projection image F 1  to thereby generate a target image H 1  showing the target region TR. The target image H 1  showing the target region TR means an image showing an object existing in the target region TR. 
       FIG. 4  is a diagram showing an example of the target image H 1 . The target image H 1  shows the wall E 1 , the ceiling E 2 , and the floor E 3 . 
     As shown in  FIG. 2 , the touch panel  12  is located on the front surface  1   a  of the information processing device  1 . The touch panel  12  is an example of the display. The touch panel  12  displays the first simulation image G 1 . The first simulation image G 1  is an example of a simulation image. 
     The first simulation image G 1  is an image obtained by superimposing a sample image J 1  on the target image H 1 . The sample image J 1  is an example of a display image. An aspect ratio of the sample image J 1  is equal to an aspect ratio of the projection image F 1 . The sample image J 1  is an image corresponding to the projection image F 1 . The sample image J 1  shows, for example, the projection image F 1 . The sample image J 1  can be an image different from the projection image F 1  such as an image obtained by monochromating the projection image F 1 . The sample image J 1  has predetermined transmittance. The transmittance of the sample image J 1  can be variable. 
     The first simulation image G 1  includes a projector image L 1 . The projector image L 1  is an image showing a projector. The shape of the projector shown in the projector image L 1  is the same as the shape of the projector  2 . The shape of the projector shown in the projector image L 1  can be different from the shape of the projector  2 . The projector image L 1  has predetermined transmittance. The transmittance of the projector image L 1  can be variable. 
     The first simulation image G 1  further includes a path image L 2 . The path image L 2  is an image showing a light path used when the projector  2  projects the projection image F 1 . The path image L 2  is also an image showing a light path virtually used when a virtual projector C 4  corresponding to the projector  2  projects an image corresponding to the projection image F 1 . The virtual projector C 4  will be described later. The path image L 2  has predetermined transmittance. The transmittance of the path image L 2  can be variable. 
     The first simulation image G 1  is not required to include at least one of the projector image L 1  and the path image L 2 . 
     A2: Example of Information Processing Device  1   
       FIG. 5  is a diagram showing an example of the information processing device  1 . The information processing device  1  includes the camera  11 , the touch panel  12 , a motion sensor  13 , a storage device  14 , and a processing device  15 . 
     The camera  11  includes an imaging lens  111  and an image sensor  112 . 
     The imaging lens  111  forms an optical image on the image sensor  112 . The imaging lens  111  forms the target image H 1  representing the target region TR on the image sensor  112 . 
     The image sensor  112  is a CCD (Charge Coupled Device) image sensor. The image sensor  112  is not limited to the CCD image sensor, but can also be, for example, a CMOS (Complementary Metal Oxide Semiconductor) image sensor. The image sensor  112  generates imaging data k based on the optical image formed on the image sensor  112 . For example, the image sensor  112  generates imaging data kt representing the target image H 1  based on the target image H 1  formed by the imaging lens  111 . The imaging data kt is an example of the imaging data k. 
     The touch panel  12  includes a display  121  and an input device  122 . The display  121  displays a variety of images. The input device  122  receives a variety of instructions. 
     The motion sensor  13  includes an acceleration sensor and a gyro sensor. The motion sensor  13  detects a motion of the information processing device  1 . For example, the motion sensor  13  detects the motion of the information processing device  1  moved by the user. The motion of the information processing device  1  is represented by at least a moving distance of the information processing device  1 , an amount of rotation of the information processing device  1 , and a direction of the information processing device  1 . The motion sensor  13  generates motion data m representing the motion of the information processing device  1 . 
     The storage device  14  is a recording medium which can be read by the processing device  15 . The storage device  14  includes, for example, a nonvolatile memory and a volatile memory. The nonvolatile memory is one of, for example, a ROM (Read Only Memory), an EPROM (Erasable Programmable Read Only Memory), and an EEPROM (Electrically Erasable Programmable Read Only Memory). The volatile memory is, for example, a RAM (Random Access Memory). The storage device  14  stores a program P 1  and a variety of types of data. The program P 1  is, for example, an application program. The program P 1  is provided to the information processing device  1  from a server not shown. The program P 1  can be stored in advance in the storage device  14 . 
     The processing device  15  is formed of a signal CPU (Central Processing Unit) or a plurality of CPUs. The single CPU or the plurality of CPUs is an example of a single processor or a plurality of processors. The processor is an example of a processor set forth in the appended claims. Each of the CPU and the processor is an example of a computer. 
     The processing device  15  retrieves the program P 1  from the storage device  14 . The processing device  15  executes the program P 1  to thereby function as an acquirer  151 , a recognizer  152 , and an operation controller  153 . 
     It is possible for the processing device  15  to function as the acquirer  151  and the operation controller  153  by executing the program P 1 , and function as the recognizer  152  by executing a program different from the program P 1 . In this case, the program different from the program. P 1  is stored in the storage device  14 , and the processing device  15  retrieves the program different from the program P 1  from the storage device  14 . 
     Each of the acquirer  151 , the recognizer  152 , and the operation controller  153  can be realized by a circuit such as a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), or an FPGA (Field Programmable Gate Array). 
     The acquirer  151  obtains the target image H 1  showing the target region TR. For example, the acquirer  151  obtains the imaging data kt representing the target image H 1  from the camera  11  to thereby obtain the target image H 1 . Further, the acquirer  151  obtains the motion data m from the motion sensor  13 . 
     The recognizer  152  obtains the imaging data kt and the motion data m from the acquirer  151 . The recognizer  152  executes three-dimensional measurement with respect to an object existing in the target region TR based on the imaging data kt and the motion data m. 
     The recognizer  152  executes the three-dimensional measurement in the following manner in the situation in which the information processing device  1  is moved from a first point to a second point while the camera  11  is imaging the wall E 1 . 
     The recognizer  152  obtains motion data ms from the acquirer  151 . The motion data ms corresponds to the motion data m which is generated by the motion sensor  13  in the situation in which the information processing device  1  is moved from the first point to the second point while the camera  11  is imaging the wall E 1 . The recognizer  152  decides the distance from the first point to the second point as a base line length based on the motion data ms. The base line length is also referred to as a length of a base line. 
     The recognizer  152  obtains first imaging data k 1  and second imaging data k 2  from the acquirer  151 . The first imaging data k 1  corresponds to the imaging data kt which is generated by the camera  11  when the information processing device  1  is located at the first point. The second imaging data k 2  corresponds to the imaging data kt which is generated by the camera  11  when the information processing device  1  is located at the second point. Each of the first imaging data k 1  and the second imaging data k 2  represents at least the wall E 1 . 
     The recognizer  152  executes triangulation using the base line length, the first imaging data k 1 , and the second imaging data k 2  to thereby execute the three-dimensional measurement. 
     The result of the three-dimensional measurement expresses the shape of the object existing in the target region TR using three-dimensional coordinates. The position of the camera  11  in the real space RS is used as a reference position of the three-dimensional measurement. The recognizer  152  recognizes the wall E 1  based on the result of the three-dimensional measurement. For example, the recognizer  152  recognizes a vertical plane as the wall E 1  based on the result of the three-dimensional measurement. The recognizer  152  decides a distance n from the information processing device  1  to the wall E 1  based on the result of the three-dimensional measurement. 
     The operation controller  153  controls an operation of the information processing device  1 . The operation controller  153  provides image data r representing an image to the touch panel  12  to thereby make the touch panel  12  display the image represented by the image data r. 
     The operation controller  153  makes the touch panel  12  display the first simulation image G 1 . The operation controller  153  generates simulation image data r 1  based on the result of the three-dimensional measurement and the imaging data kt. The simulation image data r 1  is an example of the image data r. The simulation image data r 1  represents the first simulation image G 1 . 
     For example, the operation controller  153  decides a size q of the sample image J 1  based on the distance n decided from the result of the three-dimensional measurement. The distance n is a distance from the information processing device  1  to the wall E 1 . The size q of the sample image J 1  represents the length in a lateral direction of the sample image J 1  and the length in a longitudinal direction of the sample image J 1 . The operation controller  153  increases the size q in accordance with, for example, an increase in the length n. The operation controller  153  decides a correspondence relationship between the distance n and the size q based on the field angle of the projector  2 . The field angle of the projector  2  is described in the program P 1 . Therefore, the operation controller  153  recognizes the field angle of the projector  2  in advance. 
     The operation controller  153  decides an image obtained by superimposing the sample image J 1  with the size q, and projector image L 1 , and the path image L 2  on the target image H 1  as the first simulation image G 1 . 
     The operation controller  153  decides the sample image J 1  using the virtual space VS as a three-dimensional space.  FIG. 6  is a diagram showing an example of the virtual space VS. 
     The operation controller  153  uses the virtual space VS to thereby reproduce the arrangement of the object in the real space RS. 
     The operation controller  153  uses the result of the three-dimensional measurement with respect to the wall E 1  to thereby set a first position C 1  in the virtual space VS. The first position C 1  in the virtual space VS corresponds to a position of the wall E 1  in the real space RS. 
     The operation controller  153  decides a shape of a virtual plane C 3  based on the result of the three-dimensional measurement with respect to the wall E 1 . The virtual plane C 3  has substantially the same shape as that of the wall E 1 . The virtual plane C 3  is a plane corresponding to the wall E 1 . The operation controller  153  disposes the virtual plane C 3  at the first position C 1 . 
     The operation controller  153  sets a second position C 2  in the virtual space VS based on a position of the camera  11  in the real space RS. The second position C 2  in the virtual space VS corresponds to a position of the camera  11  in the real space RS. The camera  11  is located in the information processing device  1  together with the touch panel  12 . Therefore, the second position C 2  in the virtual space VS corresponds to a position of the camera  11  in the real space RS, and at the same time, corresponds to a position of the touch panel  12  in the real space RS. 
     The operation controller  153  disposes a virtual projector C 4  at the second position C 2 . Therefore, in the virtual space VS, a relative position of the virtual projector C 4  to the second position C 2  is fixed. In the virtual space VS, the state in which the relative position of the virtual projector C 4  to the second position C 2  is fixed is not limited to the state in which the virtual projector C 4  is located at the second position C 2 . For example, in the virtual space VS, it is possible for the relative position of the virtual projector C 4  to the second position C 2  to be fixed in the state in which the virtual projector C 4  is located at a position different from the second position C 2 . 
     The second position C 2  changes in accordance with the change in position of the touch panel  12  in the real space RS. Therefore, in the situation in which the relative position of the virtual projector C 4  to the second position C 2  is fixed in the virtual space VS, when the position of the touch panel  12  in the real space RS changes, the position of the virtual projector C 4  changes in the virtual space VS. 
     The virtual projector C 4  is a projector corresponding to the projector  2 . Specifications of the virtual projector C 4  are substantially the same as specifications of the projector  2 . The specifications of the projector  2  are described in the program P 1 . Therefore, the operation controller  153  recognizes the specifications of the projector  2  in advance. 
     The operation controller  153  makes the orientation of the optical axis of a projection lens of the virtual projector C 4  with respect to the virtual plane C 3  coincide with the orientation of the optical axis of the imaging lens  111  with respect to the wall E 1 . It should be noted that the operation controller  153  decides the orientation of the optical axis of the imaging lens  111  with respect to the wall E 1  based on the recognition result of the wall E 1  and the motion data m. 
     The operation controller  153  disposes a screen image v 2  on the virtual plane C 3 . The screen image v 2  is an image obtained by viewing an image, which is displayed on the virtual plane C 3  in the situation in which the virtual projector C 4  projects the image on the virtual plane C 3 , from the second position C 2 . The screen image v 2  is another example of the display image. The screen image v 2  is an image showing a region in which the sample image J 1  is displayed. The screen image v 2  functions as a screen of the sample image J 1 . A size of the screen image v 2  is equal to the size q of the sample image J 1 . The operation controller  153  decides the size of the screen image v 2  using a method substantially the same as the method of deciding the size q of the sample image J 1 . The screen image v 2  is an image corresponding to the projection image F 1 . 
     The position of the screen image v 2  in the virtual plane C 3  is fixed in accordance with an instruction from the user. Until the instruction is obtained from the user, the operation controller  153  decides the position of the screen image v 2  in the virtual plane C 3  based on a position of an intersection between the virtual plane C 3  and the optical axis of the projection lens of the virtual projector C 4 . For example, the operation controller  153  conforms a central position of the screen image v 2  in the virtual plane C 3  to the position of the intersection between the virtual plane C 3  and the optical axis of the projection lens of the virtual projector C 4 . The central position of the screen image v 2  is, for example, a position of an intersection of diagonal lines in the screen image v 2 . 
     The operation controller  153  changes the screen image v 2  to the sample image J 1  to thereby decide the first simulation image G 1 . 
     The sample image J 1  is an image obtained by viewing an image, which is displayed on the virtual plane C 3  in the situation in which the image is projected on the virtual plane C 3  from the virtual projector C 4  the relative position to the second position C 2  of which is fixed, from the second position C 2 . 
     In the situation in which the relative position of the virtual projector C 4  to the second position C 2  is fixed in the virtual space VS, when the position of the touch panel  12  in the real space RS changes, a position of a viewpoint from which the image displayed on the virtual plane C 3  is viewed changes in addition to the position of the virtual projector C 4  in the virtual space VS. 
     The operation controller  153  generates the simulation image data r 1  representing the first simulation image G 1 . 
     The operation controller  153  provides the touch panel  12  with the simulation image data r 1  to thereby make the touch panel  12  display the first simulation image G 1 . 
     The operation controller  153  makes the touch panel  12  display the target image H 1  included in the first simulation image G 1  and the projector image L 1  included in the first simulation image G 1  with the brightness based on first information designating the brightness of the target region TR. For example, the operation controller  153  changes the brightness of the target image H 1  included in the first simulation image G 1  and the brightness of the projector image L 1  included in the first simulation image G 1  to the brightness based on the first information. It should be noted that the brightness of the projector image L 1  can be constant. 
     The operation controller  153  makes the touch panel  12  display the sample image J 1  included in the first simulation image G 1  and the path image L 2  included in the first simulation image G 1  with the brightness based on second information designating the brightness of the sample image J 1 . For example, the operation controller  153  changes the brightness of the sample image J 1  included in the first simulation image G 1  and the brightness of the path image L 2  included in the first simulation image G 1  to the brightness based on the second information. The second information also corresponds to information of designating the brightness of the light used when the virtual projector C 4  projects the image. It should be noted that the brightness of the path image L 2  can be constant. 
     The first information is input to the touch panel  12  by, for example, the user. The second information is input to the touch panel  12  by, for example, the user. The operation controller  153  can generate the second information based on the first information input to the touch panel  12 . The operation controller  153  can generate the first information based on the second information input to the touch panel  12 . 
     A3: Recognition of Wall E 1   
       FIG. 7  is a flowchart for explaining an operation of recognizing the wall E 1 . 
     When the touch panel  12  has received a start-up instruction from the user, the processing device  15  starts execution of the program P 1  as an application program in the step S 101 . 
     Subsequently, in the step S 102 , the operation controller  153  makes the camera  11  start imaging of the target region TR. The camera  11  images the target region TR to thereby generate the imaging data kt. 
     Subsequently, in the step S 103 , the operation controller  153  makes the motion sensor  13  operate. The motion sensor  13  generates the motion data m. 
     Subsequently, in the step S 104 , the acquirer  151  starts acquisition of the imaging data kt and the motion data m. 
     Subsequently, in the step S 105 , the operation controller  153  makes the recognizer  152  recognize the wall E 1 . 
     In the step S 105 , the recognizer  152  executes the three-dimensional measurement with respect to the object existing in the target region TR based on the imaging data kt and the motion data m obtained by the acquirer  151  in a scanning situation. 
     The scanning situation means the situation in which the information processing device  1  is moved from the first point to the second point while the camera  11  is imaging the wall E 1 . The first point is, for example, a position of the information processing device  1  at the starting point of the scanning situation. The second point is, for example, a position of the information processing device  1  at the ending point of the scanning situation. The imaging data kt obtained by the acquirer  151  in the scanning situation corresponds to the first imaging data k 1  and the second imaging data k 2 . The first imaging data k 1  corresponds to the imaging data kt which is generated by the camera  11  when the information processing device  1  is located at the first point. The second imaging data k 2  corresponds to the imaging data kt which is generated by the camera  11  when the information processing device  1  is located at the second point. The motion data m obtained by the acquirer  151  in the scanning situation corresponds to the motion data ms. The motion data ms corresponds to the motion data m which is generated by the motion sensor  13  in the situation in which the information processing device  1  is moved from the first point to the second point while the camera  11  is imaging the wall E 1 . 
     The recognizer  152  decides the distance from the first point to the second point as the base line length based on the motion data ms. The recognizer  152  executes the triangulation using the base line length, the first imaging data k 1 , and the second imaging data k 2  to thereby execute the three-dimensional measurement. 
     Subsequently, the recognizer  152  recognizes the wall E 1  based on the result of the three-dimensional measurement. For example, the recognizer  152  recognizes the vertical plane as the wall E 1  based on the result of the three-dimensional measurement. 
     A4: Display of First Simulation Image G 1   
       FIG. 8  is a flowchart for explaining an operation of displaying the first simulation image G 1 . The operation shown in  FIG. 8  is executed in the situation in which the wall E 1  is recognized. 
     In the step S 201 , the operation controller  153  makes the recognizer  152  decide the distance n from the information processing device  1  to the wall E 1 . 
     In the step S 201 , the recognizer  152  first obtains the motion data m from the acquirer  151 . Subsequently, the recognizer  152  decides the position of the information processing device  1  in the real space RS, namely the position of the camera  11  in the real space RS, based on the motion data m. Subsequently, the recognizer  152  decides the distance n from the information processing device  1  to the wall E 1  based on the result of the three-dimensional measurement and the position of the information processing device  1  in the real space RS. 
     Subsequently, in the step S 202 , the operation controller  153  generates the virtual space VS. 
     Subsequently, in the step S 203 , the operation controller  153  sets the first position C 1  and the second position C 2  in the virtual space VS. 
     In the step S 203 , the operation controller  153  first uses the result of the three-dimensional measurement with respect to the wall E 1  to thereby set the first position C 1  in the virtual space VS. The first position C 1  in the virtual space VS corresponds to a position of the wall E 1  in the real space RS. Subsequently, the operation controller  153  uses the position of the camera  11  in the real space RS to thereby set the second position C 2  in the virtual space VS. The second position C 2  in the virtual space VS corresponds to the position of the camera  11  in the real space RS. 
     Subsequently, in the step S 204 , the operation controller  153  disposes the virtual plane C 3  in the virtual space VS. 
     In the step S 204 , the operation controller  153  first makes the shape of the virtual plane C 3  coincide with the shape of the wall E 1  of the virtual plane C 3  based on the result of the three-dimensional measurement with respect to the wall E 1 . Subsequently, the operation controller  153  disposes the virtual plane C 3  at the first position C 1 . 
     Subsequently, in the step S 205 , the operation controller  153  disposes the virtual projector C 4  at the second position C 2 . 
     In the step S 205 , the operation controller  153  disposes the virtual projector C 4  at the second position C 2  to thereby fix the relative position of the virtual projector C 4  to the second position C 2 . Subsequently, the operation controller  153  decides the orientation of the optical axis of the imaging lens  111  with respect to the wall E 1  based on the recognition result of the wall E 1  and the motion data m. Subsequently, the operation controller  153  makes the orientation of the optical axis of the projection lens of the virtual projector C 4  with respect to the virtual plane C 3  coincide with the orientation of the optical axis of the imaging lens  111  with respect to the wall E 1 . 
     Subsequently, in the step S 206 , the operation controller  153  disposes the screen image v 2  on the virtual plane C 3 . 
     In the step S 206 , the operation controller  153  conforms the central position of the screen image v 2  in the virtual plane C 3  to the position of the intersection between the virtual plane C 3  and the optical axis of the projection lens of the virtual projector C 4 . It should be noted that the central position of the screen image v 2  in the virtual plane C 3  is not limited to the position of the intersection between the virtual plane C 3  and the optical axis of the projection lens of the virtual projector C 4 , but is only required to be a position based on the position of the intersection. Subsequently, the operation controller  153  decides the size of the screen image v 2  based on a decision result of the distance n. The operation controller  153  increases the size of the screen image v 2  in accordance with an increase in the distance n. The operation controller  153  decides the correspondence relationship between the distance n and the size of the screen image v 2  based on the field angle of the projector  2 . Subsequently, the operation controller  153  sets a path of the projection light proceeding from the virtual projector C 4  toward the screen image v 2  in the virtual space VS. Subsequently, when the touch panel  12  has received a position setting instruction from the user, the operation controller  153  fixes the screen image v 2  at the position of the screen v 2  when the position setting instruction has been received. 
     Subsequently, in the step S 207 , the operation controller  153  decides an original image of the sample image J 1 . In the step S 207 , the operation controller  153  first decides the image, which is displayed in the screen image v 2  in the virtual plane C 3  in the situation in which the image is projected on the screen image v 2  in the virtual plane C 3  from the virtual projector C 4  the relative position to the second position C 2  of which is fixed, as the original image of the sample image J 1 . It should be noted that the size of the original image of the sample image J 1  is equal to the size of the screen image v 2 . 
     Subsequently, in the step S 208 , the operation controller  153  decides the first simulation image G 1 . 
     In the step S 208 , the operation controller  153  first changes the screen image v 2  to the original image of the sample image J 1  in the virtual space VS. Subsequently, the operation controller  153  installs a virtual camera having the same characteristics as the characteristics of the camera  11  at the second position C 2 . The position of the optical axis of the imaging lens of the virtual camera coincides with a position of the optical axis of the projection lens of the virtual projector C 4 . 
     Subsequently, the operation controller  153  deletes the virtual plane C 3  from the virtual space VS while leaving the original image of the sample image J 1 , the virtual projector C 4 , and the path of the projection light from the virtual projector C 4  toward the original image of the sample image J 1  in the virtual space VS. 
     Subsequently, the operation controller  153  decides an image, which is obtained when the virtual camera executes the imaging, as the first image. 
     The first image has a transmissive property. The first image includes an image obtained when viewing the original image of the sample image J 1  from the second position C 2 . In the first image, the image obtained when viewing the original image of the sample image J 1  from the second position C 2  becomes the sample image J 1 . 
     The first image further includes an image showing the virtual projector C 4 . In the first image, the image showing the virtual projector C 4  is an example of the projector image L 1 . 
     The first image further includes an image showing the path of the projection light from the virtual projector C 4  toward the original image of the sample image J 1 . In the first image, an image showing the path of the projection light from the virtual projector C 4  toward the original image of the sample image J 1  is an example of the path image L 2 . 
     Subsequently, the operation controller  153  superimposes the first image on the target image H 1  to thereby decide the first simulation image G 1 . It should be noted that the operation controller  153  decides the brightness of the sample image J 1  in the first simulation image G 1  based on a first default value which designates the brightness of the sample image J 1  when starting the display of the sample image J 1 . The operation controller  153  decides the brightness of the target image H 1  in the first simulation image G 1  based on a second default value which represents the brightness of the target image H 1  when starting the display of the target image H 1 . The operation controller  153  decides the brightness of the projector image L 1  in the first simulation image G 1  based on a third default value which represents the brightness of the projector image L 1  when starting the display of the projector image L 1 . The operation controller  153  decides the brightness of the path image L 2  in the first simulation image G 1  based on a fourth default value which represents the brightness of the path image L 2  when starting the display of the path image L 2 . 
     Subsequently, in the step S 209 , the operation controller  153  generates the simulation image data r 1  representing the first simulation image G 1 . 
     Subsequently, in the step S 210 , the operation controller  153  provides the touch panel  12  with the simulation image data r 1  to thereby make the touch panel  12  display the first simulation image G 1 . 
     As described above, in the virtual space VS, when the relative position of the virtual projector C 4  to the second position C 2  is fixed, the operation controller  153  displays the first simulation image G 1  in which the sample image J 1  is superimposed on the target image H 1  on the touch panel  12 . The sample image J 1  is an image obtained by viewing an image, which is displayed on the virtual plane C 3  in the situation in which the virtual projector C 4  the relative position to the second position C 2  of which is fixed projects the image on the virtual plane C 3 , from the second position C 2 . 
     A5: Operation of Changing Brightness of First Simulation Image G 1   
     The visibility of the projection image F 1  projected from the projector  2  depends on the brightness of the projection image F 1  and the brightness of the target region TR. For example, when the target region TR becomes dark in the state in which the brightness of the projection image F 1  is kept, the visibility of the projection image F 1  increases. The visibility of the projection image F 1  is represented as the visibility of the sample image J 1  in the first simulation image G 1 . Therefore, in the first simulation image G 1 , it is possible to adjust both of the brightness of the sample image J 1  and the brightness of the target image H 1  so that the visibility of the projection image F 1  can be confirmed using the first simulation image G 1 . 
       FIG. 9  is a flowchart for explaining an operation of changing the brightness of the first simulation image G 1 . The operation shown in  FIG. 9  is repeated in the situation in which the touch panel  12  displays the first simulation image G 1 . 
     In the situation in which the touch panel  12  displays the first simulation image G 1 , the operation controller  153  judges whether or not the touch panel  12  has received the first information from the user in the step S 301 . In the case of YES in the step S 301 , namely when the operation controller  153  has judged that the touch panel  12  has received the first information from the user, the operation controller  153  executes the step S 302 . It should be noted that the first information is information of designating the brightness of the target region TR. 
     In the step S 302 , the operation controller  153  changes the brightness of the target image H 1  included in the first simulation image G 1  and the brightness of the projector image L 1  included in the first simulation image G 1  to the brightness based on the first information. It should be noted that in the case of NO in the step S 301 , namely when the operation controller  153  judges that the touch panel  12  has not received the first information from the user, the step S 302  is skipped. 
     Subsequently, in the step S 203 , the operation controller  153  judges whether or not the touch panel  12  has received the second information from the user. In the case of YES in the step S 303 , namely when the operation controller  153  has judged that the touch panel  12  has received the second information from the user, the operation controller  153  executes the step S 304 . It should be noted that the second information is the information of designating the brightness of the light used when the virtual projector C 4  projects the image, and furthermore, the information of designating the brightness of the sample image J 1 . 
     In the step S 304 , the operation controller  153  changes the brightness of the sample image J 1  included in the first simulation image G 1  and the brightness of the path image L 2  included in the first simulation image G 1  to the brightness based on the second information. It should be noted that in the case of NO in the step S 303 , namely when the operation controller  153  judges that the touch panel  12  has not received the second information from the user, the step S 304  is skipped. 
     The brightness of each of images included in an image u 4  described later can also be changed using substantially the same method as the method of changing the brightness of the first simulation image G 1 . In this case, the screen image v 2  is used instead of the sample image J 1 . 
     The brightness of each of images included in an image u 5  described later can also be changed using substantially the same method as the method of changing the brightness of the first simulation image G 1 . In this case, the screen image v 2  is used instead of the sample image J 1 . 
     A6: Example of Operation 
     Then, an example of the operation described above will be descried. In the step S 101 , the processing device  15  starts the execution of the program P 1 . The step S 101  is executed when the touch panel  12  receives a start-up instruction from the user. The start-up instruction is, for example, is a tap on an icon i representing the program P 1  displayed on the touch panel  12 .  FIG. 10  is a diagram showing an example of the icon i displayed on the touch panel  12 . 
     When the icon i is tapped, the processing device  15  retrieves the program P 1  from the storage device  14 . Subsequently, the processing device  15  executes the program P 1 . 
     The processing device  15  makes the touch panel  12  display a splash screen until the program P 1  is executed. When the processing device  15  executes the program P 1 , the operation controller  153  makes the touch panel  12  display a first guide image t 1 . 
       FIG. 11  is a diagram showing an example of the first guide image t 1 . The first guide image t 1  shows an outline of a function of the information processing device  1  realized by executing the program P 1 . 
     For example, the first guide image t 1  shown in  FIG. 11  shows a projector d 1  which makes a comment “I TRY TO INSTALL PROJECTOR IN MY ROOM WITH AR.” AR is an abbreviation of Augmented Reality, and means augmented reality. 
     The comment shown in the first guide image t 1  is not limited to the comment “I TRY TO INSTALL PROJECTOR IN MY ROOM WITH AR” and can arbitrarily be changed. The first guide image t 1  is not required to show the projector d 1 . The first guide image t 1  can show an object different from the projector d 1  such as an animal instead of the projector d 1 . 
     Subsequently, in the step S 102 , the camera  11  images the target region TR to thereby generate the imaging data kt. Subsequently, in the step S 103 , the motion sensor  13  generates the motion data m. Subsequently, in the step S 104 , the acquirer  151  starts the acquisition of the imaging data kt and the motion data m. 
     After completion of the step S 104 , it is possible for the operation controller  153  to obtain the imaging data kt from the acquirer  151 . In this case, the operation controller  153  provides the touch panel  12  with the imaging data kt as the image data r to thereby make the touch panel  12  display the target image H 1 .  FIG. 12  is a diagram showing an example of the information processing device  1  displaying the target image H 1 . 
     Subsequently, in the step S 105 , the operation controller  153  makes the recognizer  152  recognize the wall E 1 . 
     In the step S 105 , the operation controller  153  first makes the touch panel  12  display an image u 1 . 
       FIG. 13  is a diagram showing an example of the image u 1 . The image u 1  is an image obtained by superimposing a second guide image t 2  on the target image H 1 . The second guide image t 2  shows the projector d 1  making a comment “HI, LET&#39;S TRY TO USE PROJECTOR!” 
     The comment shown in the second guide image t 2  is not limited to the comment “HI, LET&#39;S TRY TO USE PROJECTOR!” but can arbitrarily be changed. The second guide image t 2  is not required to show the projector d 1 . The second guide image t 2  can show an object different from the projector d 1  such as an animal instead of the projector d 1 . 
     Subsequently, the operation controller  153  makes the touch panel  12  display an image u 2 . 
       FIG. 14  is a diagram showing an example of the image u 2 . The image u 2  is an image obtained by superimposing a third guide image t 3  and a button v 1  on the target image H 1 . The third guide image t 3  is an image which prompts the user to generate the scanning situation. The scanning situation means the situation in which the information processing device  1  is moved from the first point to the second point while the camera  11  is imaging the wall E 1 . The button V 1  is a button for receiving an input of start of the scanning situation. 
     The third guide image t 3  shows the projector d 1  making a comment “FIRST, PLEASE PUSH BUTTON WHERE YOU WANT TO PERFORM PROJECTION, AND THEN SHAKE SMARTPHONE.” 
     The comment shown in the third guide image t 3  is not limited to the comment “FIRST, PLEASE PUSH BUTTON WHERE YOU WANT TO PERFORM PROJECTION, AND THEN SHAKE SMARTPHONE,” but can arbitrarily be changed as long as the comment prompts the user to generate the scanning situation. The third guide image t 3  is not required to show the projector d 1 . The third guide image t 3  can show an object different from the projector d 1  such as an animal instead of the projector d 1 . The configuration of the button v 1  is not limited to the configuration shown in  FIG. 14 , but can arbitrarily be changed. 
     In accordance with the comment in the third guide image t 3 , the user pushes the button v 1  in the state in which, for example, the wall E 1  is displayed on the touch panel  12 , and then shakes the information processing device  1 . 
     When the touch panel  12  has detected the tap on the button v 1 , the operation controller  153  makes the touch panel  12  display an image u 3 . 
       FIG. 15  is a diagram showing an example of the image u 3 . The image u 3  is an image obtained by superimposing a fourth guide image t 4  on the target image H 1 . The fourth guide image t 4  shows the projector d 1  making a comment “WALL SURFACE WILL BE SCANNED.” 
     The comment shown in the fourth guide image t 4  is not limited to the comment “WALL SURFACE WILL BE SCANNED,” but can arbitrarily be changed. The fourth guide image t 4  is not required to show the projector d 1 . The fourth guide image t 4  can show an object different from the projector d 1  such as an animal instead of the projector d 1 . 
       FIG. 16  is a diagram showing a situation in which the information processing device  1  is shaken by the user. When the user shakes the information processing device  1 , the scanning situation occurs. 
     In the scanning situation, the recognizer  152  obtains the first imaging data k 1 , the second imaging data k 2 , and the motion data ms. 
     The recognizer  152  recognizes the wall E 1  based on the first imaging data k 1 , the second imaging data k 2 , and the motion data ms. 
     Subsequently, in the step S 201 , the operation controller  153  makes the recognizer  152  decide the distance n from the information processing device  1  to the wall E 1 . 
     Subsequently, in the step S 202 , the operation controller  153  generates the virtual space VS. 
     Subsequently, in the step S 203 , the operation controller  153  sets the first position C 1  and the second position C 2  in the virtual space VS. 
     Subsequently, in the step S 204 , the operation controller  153  disposes the virtual plane C 3  in the virtual space VS. 
     Subsequently, in the step S 205 , the operation controller  153  disposes the virtual projector C 4  in the virtual space VS. 
     Subsequently, in the step S 206 , the operation controller  153  disposes the screen image v 2  on the virtual plane C 3 . 
     In the step S 206 , the operation controller  153  first conforms the central position of the screen image v 2  in the virtual plane C 3  to the position of the intersection between the virtual plane C 3  and the optical axis of the projection lens of the virtual projector C 4 . 
     Subsequently, the operation controller  153  sets the path of the projection light proceeding from the virtual projector C 4  toward the screen image v 2  in the virtual space VS. 
     Subsequently, the operation controller  153  installs the virtual camera having the same characteristics as the characteristics of the camera  11  at the second position C 2 . The position of the optical axis of the imaging lens of the virtual camera coincides with the position of the optical axis of the projection lens of the virtual projector C 4 . 
     Subsequently, the operation controller  153  deletes the virtual plane C 3  from the virtual space VS while leaving the screen image v 2 , the virtual projector C 4 , and the path of the projection light from the virtual projector C 4  toward the original image of the sample image J 1  in the virtual space VS. 
     Subsequently, the operation controller  153  decides an image, which is obtained when the virtual camera executes the imaging, as the second image. 
     The second image has a transmissive property. The second image includes an image obtained when viewing the screen image v 2  from the second position C 2 . In the second image, an image obtained when viewing the screen image v 2  from the second position C 2  is another example of the display image. 
     The second image further includes an image showing the virtual projector C 4 . In the second image, the image showing the virtual projector C 4  is another example of the projector image L 1 . 
     The second image further includes an image showing the path of the projection light from the virtual projector C 4  toward the screen image v 2 . In the second image, the image showing the path of the projection light from the virtual projector C 4  toward the screen image v 2  is another example of the path image L 2 . 
     Subsequently, the operation controller  153  superimposes the second image and a fifth guide image t 5  on the target image H 1  to thereby generate the image u 4 . The image u 4  is a second simulation image. Each of the image u 4  and the second simulation image is another example of the simulation image. Subsequently, the operation controller  153  makes the touch panel  12  display the image u 4 . 
       FIG. 17  is a diagram showing an example of the image u 4 . In the image u 4 , the position of the screen image v 2  to the wall E 1  changes in accordance with each of a change in position of the touch panel  12  in the real space RS and a change in orientation of the touch panel  12  in the real space RS. The touch panel  12  is installed in the information processing device  1 . Therefore, the change in position of the touch panel  12  in the real space RS means a change in position of the information processing device  1  in the real space RS. Further, the change in orientation of the touch panel  12  in the real space RS means a change in orientation of the information processing device  1  in the real space RS. Therefore, it is possible for the user to adjust the position of the screen image v 2  with the feeling as if the information processing device  1  were the projector  2  by changing each of the position of the information processing device  1  and the orientation of the information processing device  1 . 
     Further, a portion of the wall E 1  shown in the target image H 1  is changed in accordance with each of the change in position of the touch panel  12  in the real space RS and the change in orientation of the touch panel  12  in the real space RS. 
     Therefore, when there occurs either one of the change in position of the touch panel  12  in the real space RS and the change in orientation of the touch panel  12  in the real space RS, a portion of the wall E 1  shown in the target image H 1  in the image u 4  is changed on the one hand, but the position of the projector image L 1  in the image u 4  is not changed on the other hand. Therefore, it is possible for the user to adjust the position of the screen image v 2  on the wall E 1  with the feeling as if the projector  2  existed at the position of the information processing device  1  by viewing the image u 4  displayed on the touch panel  12 . 
     The screen image v 2  includes an operation button v 3 . The operation button v 3  is used for fixing the position of the screen image v 2  to the wall E 1 . Furthermore, the operation button v 3  is used for the user to input a position setting instruction. 
     The configuration of the operation button v 3  is not limited to the configuration shown in  FIG. 17 , but can arbitrarily be changed. The color of the screen image v 2  having the operation button v 3  is gray. The color of the screen image v 2  having the operation button v 3  is not limited to gray, but can arbitrarily be changed. 
     The fifth guide image t 5  is an image which prompts the user to perform an operation of fixing the position of the screen image v 2  to the wall E 1 . The fifth guide image t 5  shows the projector d 1  making a comment “LET&#39;S PRESS OPERATION BUTTON WHEN LOCATION OF SCREEN IS DECIDED.” 
     The comment shown in the fifth guide image t 5  is not limited to the comment “LET&#39;S PRESS OPERATION BUTTON WHEN LOCATION OF SCREEN IS DECIDED,” but can arbitrarily be changed as long as the comment prompts the user to perform the operation of fixing the position of the screen image v 2 . The fifth guide image t 5  is not required to show the projector d 1 . The fifth guide image t 5  can show an object different from the projector d 1  such as an animal instead of the projector d 1 . 
     The user confirms the image u 4  while changing the position of the information processing device  1 .  FIG. 18  is a diagram showing an example of the image u 4  displayed on the information processing device  1  when the position of the information processing device  1  becomes closer to the wall E 1  than the position of the information processing device  1  displaying the image u 4  shown in  FIG. 17 . In  FIG. 18 , the fifth guide image t 5  is omitted. The closer to the wall E 1  the information processing device  1  is, the lower the ratio of the size of the screen image v 2  to the size of the wall E 1  becomes. The size of the screen image v 2  shown in  FIG. 18  is smaller than the size of the screen image v 2  shown in  FIG. 17 . It should be noted that the size of the screen image v 2  shown in the image u 4  is not required to be changed. 
     In order to notify the user of a method of decreasing the ratio of the size of the screen image v 2  to the size of the wall E 1 , it is possible for the operation controller  153  to superimpose the image showing the projector making a comment “THE CLOSER YOU GET, THE SMALLER IT BECOMES” on the image u 4 . The comment “THE CLOSER YOU GET, THE SMALLER IT BECOMES” is an example of a first operation comment representing an operation of decreasing the ratio of the size of the screen image v 2  to the size of the wall E 1 . 
     The first operation comment is not limited to the comment “THE CLOSER YOU GET, THE SMALLER IT BECOMES,” but can arbitrarily be changed. As long as the first operation comment is shown, it is not required to show the projector d 1  making the first operation comment. The object making the first operation comment is not limited to the projector d 1 , but can also be an object different from the projector d 1  such as an animal. 
       FIG. 19  is a diagram showing an example of the image u 4  displayed on the information processing device  1  when the position of the information processing device  1  becomes farther from the wall E 1  than the position of the information processing device  1  displaying the image u 4  shown in  FIG. 17 . In  FIG. 19 , the fifth guide image t 5  is omitted. The farther from the wall E 1  the information processing device  1  is, the higher the ratio of the size of the screen image v 2  to the size of the wall E 1  becomes. The size of the screen image v 2  shown in  FIG. 19  is larger than the size of the screen image v 2  shown in  FIG. 17 . It should be noted that the size of the screen image v 2  shown in the image u 4  is not required to be changed. 
     In order to notify the user of a method of increasing the ratio of the size of the screen image v 2  to the size of the wall E 1 , it is possible for the operation controller  153  to superimpose the image showing the projector making a comment “THE FARTHER YOU GET, THE LARGER IT BECOMES” on the image u 4 . The comment “THE FARTHER YOU GET, THE LARGER IT BECOMES” is an example of a second operation comment representing an operation of increasing the ratio of the size of the screen image v 2  to the size of the wall E 1 . 
     The second operation comment is not limited to the comment “THE FARTHER YOU GET, THE LARGER IT BECOMES,” but can arbitrarily be changed. As long as the second operation comment is shown, it is not required to show the projector d 1  making the second operation comment. The object making the second operation comment is not limited to the projector d 1 , but can also be an object different from the projector d 1  such as an animal. 
     It should be noted that it is possible for the operation controller  153  to change the transmittance of the screen image v 2  in the image u 4  in accordance with the distance n from the information processing device  1  to the wall E 1 . For example, the operation controller  153  increases the transmittance of the screen image v 2  in the image u 4  in accordance with an increase in the distance n. In this case, the visibility of the screen image v 2  in the image u 4  degrades in accordance with an increase in the distance n. Therefore, it is possible for the operation controller  153  to simulate the phenomenon that the visibility of the projection image F 1  in the wall E 1  degrades in accordance with an increase in distance from the wall E 1  to the projector  2 . 
       FIG. 20  is a diagram showing an example of the image u 4  displayed on the information processing device  1  when the optical axis of the imaging lens  111  is tilted with respect to a normal line of the wall E 1 . In this case, the screen image v 2  has a distortion corresponding to the tilt of the optical axis of the imaging lens  111  with respect to the normal line of the wall E 1 . The distortion is called a keystone distortion. When the projector  2  has a distortion correction function of correcting the keystone distortion, the operation controller  153  corrects the keystone distortion of the screen image v 2  using a distortion correction function equivalent to the distortion correction function provided to the projector  2 .  FIG. 21  is a diagram showing an example of the image u 4  having the screen image v 2  in which the keystone distortion shown in  FIG. 20  is corrected. In  FIG. 20  and  FIG. 21 , the fifth guide image t 5  is omitted. 
     When the touch panel  12  has detected the tap on the operation button v 3 , the operation controller  153  fixes the screen image v 2  at the position where the screen image v 2  is shown when the operation button v 3  is tapped. 
     Subsequently, the operation controller  153  updates the image u 4  into the image u 5 . For example, the operation controller  153  performs deletion of the operation button v 3 , a change of the color of the screen image v 2  from gray to blue, and addition of a sixth guide image t 6  on the image u 4  to thereby update the image u 4  into the image u 5 . The color which has been changed of the screen image v 2  is not limited to blue, but can arbitrarily be chanted. 
       FIG. 22  is a diagram showing an example of the image u 5 . The image u 5  is another example of the simulation image. The sixth guide image t 6  in the image u 5  is an image which prompts the user to decide the image to be displayed in the screen image v 2 . 
     In  FIG. 22 , the sixth guide image t 6  shows the projector d 1  making a comment “LET&#39;S TAP SCREEN TO PROJECT YOUR CHOICE ON SCREEN.” 
     The comment shown in the sixth guide image t 6  is not limited to the comment “LET&#39;S TAP SCREEN TO PROJECT YOUR CHOICE ON SCREEN,” but can arbitrarily be changed to an image as long as the image prompts the user to decide the image to be displayed in the screen image v 2 . The sixth guide image t 6  is not required to show the projector d 1 . The sixth guide image t 6  can show an object different from the projector d 1  such as an animal instead of the projector d 1 . 
     It is possible for the user to confirm the screen image v 2  thus fixed by looking at the image u 5  while moving the information processing device  1 .  FIG. 23  is a diagram showing an example of the image u 5  displayed on the information processing device  1  when the position of the information processing device  1  becomes closer to the wall E 1  than the position of the information processing device  1  displaying the image u 5  shown in  FIG. 22 . In  FIG. 23 , the sixth guide image t 6  is omitted. In the situation in which the position of the screen image v 2  is fixed, the ratio of the size of the screen image v 2  to the size of the wall E 1  also decreases in accordance with the decrease in distance between the information processing device  1  and the wall E 1 . The size of the screen image v 2  shown in  FIG. 23  is smaller than the size of the screen image v 2  shown in  FIG. 22 . It should be noted that the size of the screen image v 2  shown in the image u 5  can be constant. 
     It is possible for the operation controller  153  to superimpose an image showing the projector d 1  which makes the first operation comment such as “THE CLOSER YOU GET, THE SMALLER IT BECOMES” on the image u 5 . As long as the first operation comment is shown, it is not required to show the projector d 1  making the first operation comment. The object making the first operation comment is not limited to the projector d 1 , but can also be an object different from the projector d 1  such as an animal. 
       FIG. 24  is a diagram showing an example of the image u 5  displayed on the information processing device  1  when the position of the information processing device  1  becomes farther from the wall E 1  than the position of the information processing device  1  displaying the image u 5  shown in  FIG. 22 . In  FIG. 24 , the sixth guide image t 6  is omitted. In the situation in which the position of the screen image v 2  is fixed, the ratio of the size of the screen image v 2  to the size of the wall E 1  also increases in accordance with the increase in distance between the information processing device  1  and the wall E 1 . The size of the screen image v 2  shown in  FIG. 24  is larger than the size of the screen image v 2  shown in  FIG. 22 . It should be noted that the size of the screen image v 2  shown in the image u 5  can be constant. 
     It is possible for the operation controller  153  to superimpose an image showing the projector d 1  which makes the second operation comment such as “THE FARTHER YOU GET, THE LARGER IT BECOMES” on the image u 5 . As long as the second operation comment is shown, it is not required to show the projector d 1  making the second operation comment. The object making the second operation comment is not limited to the projector d 1 , but can also be an object different from the projector d 1  such as an animal. 
     It should be noted that it is possible for the operation controller  153  to change the transmittance of the screen image v 2  in the image u 5  in accordance with the distance n from the information processing device  1  to the wall E 1 . For example, the operation controller  153  increases the transmittance of the screen image v 2  in the image u 5  in accordance with an increase in the distance n. 
       FIG. 25  is a diagram showing an example of the image u 5  displayed on the information processing device  1  when the optical axis of the imaging lens  111  is tilted with respect to the normal line of the wall E 1 . In this case, the screen image v 2  has a keystone distortion corresponding to the tilt of the optical axis of the imaging lens  111  with respect to the normal line of the wall E 1 . When the projector  2  has the distortion correction function of correcting the keystone distortion, the operation controller  153  corrects the keystone distortion of the screen image v 2  using the distortion correction function equivalent to the distortion correction function provided to the projector  2 .  FIG. 26  is a diagram showing an example of the image u 5  having the screen image v 2  in which the keystone distortion shown in  FIG. 25  is corrected. In  FIG. 25  and  FIG. 26 , the sixth guide image t 6  is omitted. 
     It is possible for the user to decide the image to be displayed in the screen image v 2  by operating the information processing device  1  in accordance with the sixth guide image t 6 . 
     When the touch panel  12  has detected the tap on the screen image v 2  in the image u 5 , the operation controller  153  makes the touch panel  12  display a menu image v 4 . 
       FIG. 27  is a diagram showing an example of the menu image v 4 . The menu image v 4  includes a selection button v 5 , a first adjustment button v 6 , and a second adjustment button v 7 . 
     The selection button v 5  is used for deciding an image to be displayed in the screen image v 2 , namely the sample image J 1 . The first adjustment button v 6  is used for adjusting the brightness of the target image H 1 . The second adjustment button v 7  is used for adjusting the brightness of the screen image v 2  and the brightness of the sample image J 1 . Adjusting the brightness of the screen image v 2  and adjusting the brightness of the sample image J 1  each mean adjusting the brightness of the light emitted by the virtual projector C 4 . 
     When the touch panel  12  has detected a tap on the selection button v 5 , the operation controller  153  makes the touch panel  12  display an image v 81 . 
       FIG. 28  is a diagram showing an example of the image v 81 . The image v 81  shows candidates v 8  of an image to be displayed in the screen image v 2 . The candidates v 8  of the image are each an image corresponding to the projection image F 1  projected from the projector  2 . For example, the candidates v 8  of the image are each an image showing the projection image F 1  projected from the projector  2 . The candidate v 8  of the image is, for example, a photographic image represented by photographic data. The candidate v 8  of the image can be an image of a document represented by document data. 
     The user taps one of the candidates v 8  of the image to be used as the sample image J 1 . When the tough panel  12  has detected the tap on the candidate v 8  of the image, the operation controller  153  decides the candidate v 8  of the image thus tapped as the sample image J 1 . 
     Subsequently, in the step S 207 , the operation controller  153  decides an original image of the sample image J 1 . In the step S 207 , the operation controller  153  changes the size of the sample image J 1  into the size of the screen image v 2  to thereby decide the original image of the sample image J 1 . 
     Subsequently, in the step S 208 , the operation controller  153  decides the first simulation image G 1 . 
     In the step S 208 , the operation controller  153  changes the screen image v 2  to the original image of the sample image J 1  in the virtual space VS. Subsequently, the operation controller  153  installs the virtual camera having the same specifications as the specifications of the camera  11  at the second position C 2 . The position of the optical axis of the imaging lens of the virtual camera coincides with the position of the optical axis of the projection lens of the virtual projector C 4 . 
     Subsequently, the operation controller  153  deletes the virtual plane C 3  from the virtual space VS while leaving the original image of the sample image J 1 , the virtual projector C 4 , and the path of the projection light from the virtual projector C 4  toward the original image of the sample image J 1  in the virtual space VS. 
     Subsequently, the operation controller  153  decides an image, which is obtained when the virtual camera executes the imaging, as the first image. 
     Subsequently, the operation controller  153  superimposes the first image on the target image H 1  to thereby decide the first simulation image G 1 . 
     Subsequently, in the step S 209 , the operation controller  153  generates the simulation image data r 1  representing the first simulation image G 1 . 
     Subsequently, in the step S 210 , the operation controller  153  provides the touch panel  12  with the simulation image data r 1  to thereby make the touch panel  12  display the first simulation image G 1 . 
     In the situation in which the first simulation image G 1  is displayed on the touch panel  12 , when the touch panel  12  has detected the tap on the sample image J 1 , the operation controller  153  makes the touch panel  12  display the menu image v 4  shown in  FIG. 27 . 
     When the touch panel  12  has detected the tap on the first adjustment button v 6  in the menu image v 4 , the operation controller  153  makes the touch panel  12  display an image u 6 . 
       FIG. 29  is a diagram showing an example of the image u 6 . The image u 6  includes an image u 61  and an image u 62 . The image u 61  is an image showing an operator v 9 . The image u 62  is an image obtained by superimposing a fixation button v 10  and a cancel button v 11  on the first simulation image G 1 . 
     The operator v 9  includes an adjustment button v 91 , a positive mark v 92 , and a negative mark v 93 . 
     The adjustment button v 91  can move between the positive mark v 92  and the negative mark v 93 . The movement of the adjustment button v 91  is performed by a swipe at the adjustment button v 91  by the user. The swipe at the adjustment button v 91  by the user is received by the touch panel  12 . An end position of the swipe at the adjustment button v 91  by the user is an example of the first information for designating the brightness of the target region TR. The operation of the touch panel  12  receiving the swipe at the adjustment button v 91  by the user is an example of the step S 301 . 
     Subsequently, in the step S 302 , the operation controller  153  changes the brightness of the target image H 1  included in the first simulation image G 1  and the brightness of the projector image L 1  included in the first simulation image G 1  to the brightness based on the swipe at the adjustment button v 91 . 
     In the step S 302 , the operation controller  153  first decides the position of the adjustment button v 91  which has been moved based on the swipe received by the touch panel  12 . The operation controller  153  adjusts the brightness of the target image H 1  and the brightness of the projector image L 1  based on the position of the adjustment button v 91  having been moved. 
     The operation controller  153  makes the target image H 1  brighter in accordance with a decrease in distance between the position of the adjustment button v 91  and the positive mark v 92 . The operation controller  153  makes the projector image L 1  brighter in accordance with the decrease in distance between the position of the adjustment button v 91  and the positive mark v 92 . 
     The operation controller  153  makes the target image H 1  darker in accordance with a decrease in distance between the position of the adjustment button v 91  and the negative mark v 93 . The operation controller  153  makes the projector image L 1  darker in accordance with the decrease in distance between the position of the adjustment button v 91  and the negative mark v 93 . 
       FIG. 30  is a diagram showing an example in which the operation controller  153  has made the target image H 1  and the projector image L 1  darker in accordance with the decrease in distance between the position of the adjustment button v 91  and the negative mark v 93 . 
     It is possible for the user to adjust the brightness of the target image H 1  by performing the swipe at the adjustment button v 91 . 
     The fixation button v 10  is used for fixing the brightness of the target image H 1 . When the touch panel  12  has detected the tap on the fixation button v 10 , the operation controller  153  fixes the brightness of the target image H 1  and the brightness of the projector image L 1  to the brightness based on the position of the adjustment button v 91 . Subsequently, the operation controller  153  changes the display on the touch panel  12  from the image u 6  to the first simulation image G 1 . 
     The cancel button v 11  is used for canceling the adjustment of the brightness of the target image H 1  due to the movement of the adjustment button v 91 . When the touch panel  12  has detected the tap on the cancel button v 11 , the operation controller  153  restores the brightness of the target image H 1  and the brightness of the projector image L 1  to the brightness before the adjustment button v 121  is moved. Subsequently, the operation controller  153  changes the display on the touch panel  12  from the image u 6  to the first simulation image G 1 . 
     When the touch panel  12  has detected the tap on the second adjustment button v 7  in the menu image v 4  shown in  FIG. 27 , the operation controller  153  makes the touch panel  12  display an image u 7 . 
       FIG. 31  is a diagram showing an example of the image u 7 . The image u 7  includes an image u 71  and an image u 72 . The image u 71  is an image showing an operator v 12 . The image u 72  is an image obtained by superimposing a fixation button v 13  and a cancel button v 14  on the first simulation image G 1 . 
     The operator v 12  includes an adjustment button v 121 , a positive mark v 122 , and a negative mark v 123 . 
     The adjustment button v 121  can move between the positive mark v 122  and the negative mark v 123 . The movement of the adjustment button v 121  is performed by a swipe at the adjustment button v 121  by the user. The swipe at the adjustment button v 121  by the user is received by the touch panel  12 . An end position of the swipe at the adjustment button v 121  by the user is an example of the second information for designating the brightness of the sample image J 1  and the brightness of the screen image v 2 . The second information also corresponds to information of designating the brightness of the light used when the virtual projector C 4  projects the projection image F 1 . The operation of the touch panel  12  receiving the swipe at the adjustment button v 121  by the user is an example of the step S 303 . 
     Subsequently, in the step S 304 , the operation controller  153  changes the brightness of the sample image J 1  included in the first simulation image G 1  and the brightness of the path image L 2  included in the first simulation image G 1  to the brightness based on the swipe at the adjustment button v 121 . 
     In the step S 304 , the operation controller  153  first decides the position of the adjustment button v 121  based on the detection result by the touch panel  12 . 
     The operation controller  153  makes the sample image J 1  brighter in accordance with a decrease in distance between the position of the adjustment button v 121  and the positive mark v 122 . It is possible for the operation controller  153  to make the path image L 2  brighter in accordance with the decrease in distance between the position of the adjustment button v 121  and the positive mark v 122 . 
     The operation controller  153  makes the sample image J 1  darker in accordance with a decrease in distance between the position of the adjustment button v 121  and the negative mark v 123 . It is possible for the operation controller  153  to make the path image L 2  darker in accordance with the decrease in distance between the position of the adjustment button v 121  and the negative mark v 123 . 
       FIG. 32  is a diagram showing an example in which the operation controller  153  has made the sample image J 1  and the path image L 2  darker in accordance with the decrease in distance between the position of the adjustment button v 121  and the negative mark v 123 . 
     It is possible for the user to adjust the brightness of the sample image J 1  and the brightness of the path image L 2  by performing the swipe at the adjustment button v 121 . The position of the adjustment button v 121  decided by the swipe at the adjustment button v 121  is an example of the second information. 
     The fixation button v 13  is used for fixing the brightness of the sample image J 1 . When the touch panel  12  has detected the tap on the fixation button v 13 , the operation controller  153  fixes the brightness of the sample image J 1  and the brightness of the path image L 2  to the brightness based on the position of the adjustment button v 121 . Subsequently, the operation controller  153  changes the display on the touch panel  12  from the image u 7  to the first simulation image G 1 . 
     The cancel button v 14  is used for canceling the adjustment of the brightness of the sample image J 1  due to the movement of the adjustment button v 121 . When the touch panel  12  has detected the tap on the cancel button v 14 , the operation controller  153  restores the brightness of the sample image J 1  and the brightness of the path image L 2  to the brightness before the adjustment button v 121  is moved. Subsequently, the operation controller  153  changes the display on the touch panel  12  from the image u 7  to the first simulation image G 1 . 
     A7: Conclusion of First Embodiment 
     The display method and the information processing device  1  according to the first embodiment include the following aspects. 
     The acquirer  151  obtains the target image H 1  showing the target region TR including the wall E 1 . The operation controller  153  makes the touch panel  12  display the first simulation image G 1 . The first simulation image G 1  is the image obtained by superimposing the sample image J 1  corresponding to the projection image F 1  to be projected on the wall E 1  by the projector  2  on the target image H 1 . The operation controller  153  makes the touch panel  12  display the target image H 1  included in the first simulation image G 1  with the brightness based on the first information designating the brightness of the target region TR. The operation controller  153  makes the touch panel  12  display the sample image J 1  included in the first simulation image G 1  with the brightness based on the second information designating the brightness of the sample image J 1 . According to this aspect, it is possible to adjust the brightness of the target image H 1  and the brightness of the sample image J 1  in the first simulation image G 1  using the first information and the second information. Therefore, it becomes easy for the user to imagine the actual visibility of the projection image F 1  by viewing the first simulation image G 1 . 
     The first simulation image G 1  includes the projector image L 1  as the image showing the projector  2 . According to this aspect, it becomes easy for the user to imagine the projector  2  projecting the projection image F 1  by viewing the first simulation image G 1 . 
     The operation controller  153  makes the touch panel display the projector image L 1  included in the first simulation image G 1  with the brightness based on the first information. According to this aspect, it becomes easier for the user to imagine the aspect of the projector  2  projecting the projection image F 1  by viewing the first simulation image G 1 . 
     The first simulation image G 1  includes the path image L 2  showing the path of the light used by the projector  2  for the projection of the projection image F 1 . According to this aspect, it becomes easy for the user to imagine the path of the light used by the projector  2  for the projection of the projection image F 1  by viewing the first simulation image G 1 . 
     The operation controller  153  makes the touch panel  12  display the path image L 2  included in the first simulation image G 1  with the brightness based on the second information. According to this aspect, it becomes easier for the user to imagine the path of the light used by the projector  2  for the projection of the projection image F 1  by viewing the first simulation image G 1 . 
     B: Modified Examples 
     Some aspects of the modifications of the embodiment hereinabove illustrated will hereinafter be illustrated. It is also possible to arbitrarily combine two or more aspects arbitrarily selected from the following illustrations with each other within a range in which the aspects do not conflict with each other. 
     B1: First Modified Example 
     In the first embodiment, it is possible for the operation controller  153  to decide the second information based on the first information. 
     For example, when the target image H 1  included in the first simulation image G 1  becomes bright due to the first information, the operation controller  153  decides the second information which makes the sample image J 1  included in the first simulation image G 1  dark. Further, when the target image H 1  included in the first simulation image G 1  becomes dark due to the first information, the operation controller  153  decides the second information which makes the sample image J 1  included in the first simulation image G 1  bright. In such a case, it is possible for the operation controller  153  to prevent the contrast between the target image H 1  and the sample image J 1  from degrading. Therefore, it is possible to prevent the deterioration of the visibility of the sample image J 1  due to the degradation of the contrast between the target image H 1  and the sample image J 1 . 
     According to the first modified example, it is possible for the operation controller  153  to change the brightness of the sample image J 1  in accordance with the change in brightness of the target image H 1 . 
     Further, in the first embodiment and the first modified example, it is possible for the operation controller  153  to decide the first information based on the second information. 
     When the sample image J 1  included in the first simulation image G 1  becomes bright due to the second information, the operation controller  153  decides the first information which makes the target image H 1  included in the first simulation image G 1  dark. Further, when the sample image J 1  included in the first simulation image G 1  becomes dark due to the second information, the operation controller  153  decides the first information which makes the target image H 1  included in the first simulation image G 1  bright. In such a case, it is possible for the operation controller  153  to prevent the contrast between the target image H 1  and the sample image J 1  from degrading. Therefore, it is possible to prevent the deterioration of the visibility of the sample image J 1  due to the degradation of the contrast between the target image H 1  and the sample image J 1 . 
     In this case, it is possible for the operation controller  153  to change the brightness of the target image H 1  in accordance with the change in brightness of the sample image J 1 . 
     B2: Second Modified Example 
     In the first modified example, each of the target image H 1  and the sample image J 1  can be semi-transparent. 
     When both of the target image H 1  and the sample image J 1  are not affected by the first information and the second information, namely when the neither the first information nor the second information is input by the user, the operation controller  153  sets a value of a coefficient w 1  for adjusting the brightness of the target image H 1  to “0.5.” When both of the target image H 1  and the sample image J 1  are not affected by the first information and the second information, the operation controller  153  sets a value of a coefficient w 2  for adjusting the brightness of the sample image J 1  to “0.5.” 
     The operation controller  153  multiplies the luminance of each of the pixels of the target image H 1  by the coefficient W 1  to thereby change the luminance of each of the pixels of the target image H 1 . The operation controller  153  multiplies the luminance of each of the pixels of the sample image J 1  by the coefficient W 2  to thereby change the luminance of each of the pixels of the sample image J 1 . 
     The operation controller  153  superimposes the sample image J 1  in which the luminance of each of the pixels has been changed on the target image H 1  in which the luminance of each of the pixels has been changed to thereby prevent the luminance of the portion where the sample image J 1  is superimposed on the target image H 1  from becoming excessively high even which each of the target image H 1  and the sample image J 1  is semi-transparent. 
     When the brightness based on the first information is the brightness which makes the target image H 1  bright, the operation controller  153  increases the value of the coefficient w 1  and decreases the value of the coefficient w 2  so that a total value of the value of the coefficient w 1  and the value of the coefficient w 2  is kept at “1.” 
     When the brightness based on the first information is the brightness which makes the target image H 1  dark, the operation controller  153  decreases the value of the coefficient w 1  and increases the value of the coefficient w 2  so that the total value of the value of the coefficient w 1  and the value of the coefficient w 2  is kept at “1.” 
     When the brightness based on the second information is the brightness which makes the sample image J 1  bright, the operation controller  153  decreases the value of the coefficient w 1  and increases the value of the coefficient w 2  so that the total value of the value of the coefficient w 1  and the value of the coefficient w 2  is kept at “1.” 
     When the brightness based on the second information is the brightness which makes the sample image J 1  dark, the operation controller  153  increases the value of the coefficient w 1  and decreases the value of the coefficient w 2  so that the total value of the value of the coefficient w 1  and the value of the coefficient w 2  is kept at “1.” 
     It should be noted that the coefficient w 1  having been changed corresponds to the first information, and the coefficient w 2  having been changed corresponds to the second information. 
     According to the second modified example, even when each of the target image H 1  and the sample image J 1  is semi-transparent, it is prevented that the luminance of the portion where the sample image J 1  is superimposed on the target image H 1  becomes excessively high. 
     B3: Third Modified Example 
     In the first embodiment, and the first and second modified examples, it is possible for the operation controller  153  to change the brightness of the path image L 2  into the brightness different from the brightness based on the second information when the touch panel  12  receives a change instruction of changing the brightness of the path image L 2 . The change instruction is a tap on the projector image L 1 . The change instruction is not limited to the tap on the projector image L 1 , but can be, for example, a tap on the path image L 2 . 
     For example, when the touch panel  12  receives the change instruction, the operation controller  153  makes the brightness of the path image L 2  darker than the brightness based on the second information. Making the brightness of the path image L 2  darker than the brightness based on the second information includes making the transmittance of the path image L 2  higher than the transmittance of the path image L 2  having the brightness based on the second information. In this case, it is possible to make the display of the path image L 2  inconspicuous. According to the third modified example, it is possible to change the brightness of the path image L 2  independently of the brightness of the sample image J 1 . 
     B4: Fourth Modified Example 
     In the first embodiment, and the first through third modified examples, it is possible for the projector  2  to have an optical zoom lens. In this case, it is possible for the operation controller  153  to change the size of the screen image v 2  and the size of the sample image J 1  within a range based on a zoom characteristic of the optical zoom lens provided to the projector  2 . 
     For example, when the touch panel  12  has received pinch-in in the situation in which the touch panel  12  displays the screen image v 2 , the operation controller  153  decreases the size of the screen image v 2  within the range based on the zoom characteristic of the optical zoom lens. 
     When the touch panel  12  has received pinch-out in the situation in which the touch panel  12  displays the screen image v 2 , the operation controller  153  increases the size of the screen image v 2  within the range based on the zoom characteristic of the optical zoom lens. 
     When the touch panel  12  has received pinch-in in the situation in which the touch panel  12  displays the sample image J 1 , the operation controller  153  decreases the size of the sample image J 1  within the range based on the zoom characteristic of the optical zoom lens. 
     When the touch panel  12  has received pinch-out in the situation in which the touch panel  12  displays the sample image J 1 , the operation controller  153  increases the size of the sample image J 1  within the range based on the zoom characteristic of the optical zoom lens. 
     When the projector  2  has a digital zoom function, it is possible for the operation controller  153  to change the size of the screen image v 2  and the size of the sample image J 1  within a range based on a zoom characteristic of the digital zoom function provided to the projector  2 . A method of changing the size of the screen image v 2  when the projector  2  has the digital zoom function is substantially the same as, for example, the method of changing the size of the screen image v 2  when the projector  2  has the optical zoom lens. A method of changing the size of the sample image J 1  when the projector  2  has the digital zoom function is substantially the same as, for example, the method of changing the size of the sample image J 1  when the projector  2  has the optical zoom lens. 
     According to the fourth modified example, when the projector  2  has the optical zoom lens or the digital zoom function, it is possible to display the first simulation image G 1  corresponding to the zoom function provided to the projector  2 . 
     B5: Fifth Modified Example 
     In the first embodiment, and the first through fourth modified examples, it is possible for the projector  2  to have a lens shifting function. In this case, it is possible for the operation controller  153  to change the position of the screen image v 2  and the position of the sample image J 1  within a range based on a shifting characteristic of the lens shifting function provided to the projector  2 . 
     For example, when the touch panel  12  has received a swipe at the screen image v 2 , the operation controller  153  moves the screen image v 2  in accordance with the swipe within a range based on the shifting characteristic of the lens shifting function. 
     When the touch panel  12  has received a swipe at the sample image J 1 , the operation controller  153  moves the sample image J 1  in accordance with the swipe within a range based on the shifting characteristic of the lens shifting function. 
     According to the fifth modified example, when the projector  2  has the lens shifting function, it is possible to display the first simulation image G 1  corresponding to the lens shifting function provided to the projector  2 . 
     B6: Sixth Modified Example 
     In the first embodiment, and the first through fifth modified examples, a portion to be displayed on the touch panel out of the screen image v 2  can be restricted. For example, the operation controller  153  uses a mask v 16  to thereby limit the portion to be displayed on the touch panel  12  out of the screen image v 2 . 
       FIG. 33  is a diagram showing an example of the mask v 16 . The mask v 16  includes a transmissive region v 161  and a non-transmissive region v 162 . The transmittance of the transmissive region v 161  is 100%. The transmittance of the non-transmissive region v 162  is 0%. Each of the shape of the transmissive region v 161  and the shape of the non-transmissive region v 162  can arbitrarily be changed. The mask v 16  is selected by the user. 
     The operation controller  153  superimposes the mask v 16  on the screen image v 2  to thereby limit the portion to be displayed on the touch panel  12  out of the screen image v 2 . In this case, only the portion on which the transmissive region v 161  is superimposed is displayed on the touch panel  12  out of the screen image v 2 . 
     It is possible for the operation controller  153  to superimpose the mask v 16  on the sample image J 1  to thereby limit the portion to be displayed on the touch panel  12  out of the sample image J 1 . In this case, only the portion on which the transmissive region v 161  is superimposed is displayed on the touch panel  12  out of the sample image J 1 . 
     According to the sixth modified example, it is possible to restrict the portion to be displayed on the touch panel  12  out of the screen image v 2 , and the portion to be displayed on the touch panel  12  out of the sample image J 1 . Further, it is possible to set the shape of the portion to be displayed on the touch panel  12  out of the screen image v 2 , and the shape of the portion to be displayed on the touch panel  12  out of the sample image J 1  in accordance with the shape of the non-transmissive region v 162 . 
     B7: Seventh Modified Example 
     In the first embodiment, and the first through sixth modified examples, it is possible for the operation controller  153  to make the touch panel  12  display at least one of the size of the screen image v 2  and the size of the sample image J 1 . Further, in the first embodiment, and the first through sixth modified examples, it is possible for the operation controller  153  to make the touch panel  12  display the distance n from the information processing device  1  to the wall E 1 . 
       FIG. 34  is a diagram showing an example of an image u 8  which displays the size of the screen image v 2  and the distance n. 
     In  FIG. 34 , α m is shown as a length in a horizontal direction of the screen image v 2 . As a length in a vertical direction of the screen image v 2 , there is shown β m. As the distance n, there is shown γ m. 
     It should be noted that the display configuration of the size of the sample image J 1  is substantially the same as, for example, the display configuration of the size of the screen image v 2 . The display configuration of the size of the screen image v 2 , the display configuration of the distance n, and the display configuration of the sample image J 1  are not limited to the display configurations shown in  FIG. 34 , but can arbitrarily be changed. 
     According to the seventh modified example, it is possible for the user to confirm at least one of the size of the screen image v 2 , the size of the sample image J 1 , and the distance n by viewing the touch panel  12 . 
     B8: Eighth Modified Example 
     In the first embodiment, and the first through seventh modified examples, it is possible to change the projector  2  as an object of the simulation. In this case, the operation controller  153  generates the first simulation image G 1  based on the characteristics of the projector  2  which has been changed, and which is the object of the simulation. 
     In the first embodiment, and the first through seventh modified examples, it is possible to select the projector  2  as the object of the simulation from a plurality of projectors. In this case, the operation controller  153  generates the first simulation image G 1  based on the characteristics of the projector  2  which has been selected, and which is the object of the simulation. 
     B9: Ninth Modified Example 
     In the first embodiment, and the first through eighth modified examples, the position of the virtual projector C 4  can be fixed to the virtual space VS. 
     B10: Tenth Modified Example 
     In the first embodiment, and the first through ninth modified examples, the camera  11 , the touch panel  12 , and the processing device  15  can be made as separated bodies. In the first embodiment, and the first through ninth modified examples, the camera  11  and the touch panel  12  can be separated from the information processing device  1 . In the first embodiment, and the first through ninth modified examples, the camera  11  can be separated from the information processing device  1 . In the first embodiment, and the first through ninth modified examples, the touch panel  12  can be separated from the information processing device  1 . In the first embodiment, and the first through ninth modified examples, the display  121  and the input device  122  can be separated from each other.