Abstract:
An apparatus, method, and computer-readable storage medium for processing image data are provided. The apparatus includes an output unit configured to project a first image on a projection surface, a detection unit configured to detect movement of the apparatus, and a processor configured to change the first image to a second image based on the detected movement.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims priority of Japanese Patent Application No. 2010-214043, filed on Sep. 24, 2010, the entire content of which is hereby incorporated by reference. 
       BACKGROUND 
       [0002]    The present disclosure relates to an information processing apparatus, an information processing terminal, an information processing method and a computer program. More particularly, the present disclosure relates to an information processing terminal which has a projector, and an information processing apparatus, an information processing method and a computer program which carry out display control of the information processing terminal. 
         [0003]    In recent years, miniaturization of mobile apparatus such as mobile communication terminal has been and is advancing. As the size of an apparatus itself decreases, also the size of the display area provided on the apparatus inevitably decreases. However, if the visibility of information and the operability are taken into consideration, then the size of the display region cannot be made smaller than a predetermined size, and there is a limitation to miniaturization of apparatus. 
         [0004]    In contrast, a projector which is one of display apparatuses which project an image to a screen or the like to display the image does not require provision of the display region on the apparatus. Therefore, provision of a projector in place of the display region makes miniaturization of a mobile apparatus possible. For example, Japanese Patent Laid-Open No. 2009-3281 discloses a configuration wherein a projector module is provided on a portable electronic apparatus. 
       SUMMARY 
       [0005]    However, in the case where an image or the like is projected and displayed by a projector, different from a touch panel or the like, the display screen cannot be used to directly carry out an inputting operation thereon. Therefore, there is a problem that a large number of operating elements such as buttons for operating display information are obliged to be provided on the apparatus. Since the user operates the operation elements while observing the operation section, a considerable operation burden in operation is imposed on the user. 
         [0006]    Therefore, it is desirable to provide a novel and improved information processing apparatus, information processing terminal, information processing method and computer program which make it possible to intuitively operate display information in response to a variation of a state of an apparatus which includes a projector with respect to a projection plane. 
         [0007]    Accordingly, there is disclosed an apparatus for processing image data. The apparatus may include an output unit configured to project a first image on a projection surface; a detection unit configured to detect movement of the apparatus; and a processor configured to change the first image to a second image based on the detected movement. 
         [0008]    In accordance with an embodiment, there is provided a method for processing image data. The method may include projecting, by a projector included in the device, a first image on a projection surface; detecting movement of the device; and changing the first image to a second image based on the detected movement. 
         [0009]    In accordance with an embodiment, there is provided a computer-readable storage medium including instructions, which, when executed on a processor, cause the processor to perform a method of processing image data. The method may include projecting a first image on a projection surface; detecting movement of a device, the processor being included in the device; and changing the first image to a second image based on the detected movement. 
         [0010]    With the information processing apparatus, information processing terminal, information processing method and computer program, display information can be operated intuitively in response to a variation of a state of an apparatus which includes a projector with respect to a projection plane. 
         [0011]    The above and other features and advantages of the present disclosure will become apparent from the following description and the appended claims, taken in conjunction with the accompanying drawings in which like parts or elements denoted by like reference symbols. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0012]      FIG. 1  is a block diagram showing an example of a hardware configuration of an information processing terminal according to an embodiment of the present disclosure; 
           [0013]      FIG. 2  is a schematic view illustrating a method for detecting a posture variation of the information processing terminal using an acceleration sensor; 
           [0014]      FIG. 3  is a schematic view illustrating a method of detecting a posture variation of the information processing terminal using an angular speed sensor; 
           [0015]      FIG. 4  is a block diagram showing a functional configuration of the information processing terminal; 
           [0016]      FIG. 5  is a flow chart illustrating a display controlling process by the information processing terminal; 
           [0017]      FIG. 6  is a schematic view illustrating an example of a display controlling process of display information by a translational movement of the information processing terminal; 
           [0018]      FIG. 7  is a schematic view illustrating an example of a display controlling process for controlling an eye point of a content projected to a projection plane; 
           [0019]      FIG. 8  is a schematic view illustrating an example of a display controlling process for carrying out scrolling of an object list projected to the projection plane; 
           [0020]      FIG. 9  is a schematic view illustrating another example of the display controlling process for carrying out scrolling of an object list projected to the projection plane; 
           [0021]      FIG. 10  is a schematic view illustrating a further example of the display controlling process for carrying out scrolling of an object list projected to the projection plane; 
           [0022]      FIG. 11  is a schematic view illustrating a movement of the information processing terminal and a variation of display information when a desired object is selected from within an object group including a plurality of objects based on a proximity distance; 
           [0023]      FIG. 12  is a schematic view illustrating a process for changing the display granularity of a map displayed on the projection plane in response to a proximity distance; and 
           [0024]      FIG. 13  is a schematic view illustrating a process for changing the display granularity of a GUI displayed on the projection plane in response to a proximity distance. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0025]    In the following, an embodiment of the present disclosure is described in detail with reference to the accompanying drawings. It is to be noted that, in the specification and the accompanying drawings, substantially like parts or elements having substantially like functional configurations are denoted by like reference characters, and overlapping description of the same is omitted herein to avoid redundancy. 
         [0026]    It is to be noted that description is given in the following order. 
         [0027]    1. Configuration of the Information Process Terminal Including a Projector (example of a hardware configuration, functional configuration) 
         [0028]    2. Display Control by the Information Processing Terminal 
         [0029]    2-1. Change of Display Information by Transitional Movement of the Information Processing Terminal 
         [0030]    2-2. Change of Display Information by a Gradient of the Information Processing Terminal 
         [0031]    2-3. Scroll of Display Information by a Gradient of the Information Processing Terminal 
         [0032]    2-4. Object Selection Operation from within an Object Group 
         [0033]    2-5. Zoom processing in Response to the Proximity Distance between the Information Processing Terminal and a Projection Plane 
       &lt;1. Configuration of the Information Process Terminal Including a Projector&gt; 
       [0000]    
       
         Example of a Hardware Configuration 
       
     
         [0035]    First, an example of a hardware configuration of an information processing terminal according to an embodiment of the present disclosure is described with reference to  FIGS. 1 to 3 . 
         [0036]    The information processing terminal  100  according to the present embodiment includes a projector and varies the display substance of a GUI projected to a projection plane of a projection target body by the projector in response to a variation of the posture of the information processing terminal  100  or a change of the distance of the information processing terminal  100  to the projection plane. The information processing terminal  100  may be applied to various apparatus which include a projector irrespective of functions thereof such as, for example, small-sized apparatus like a personal digital assistant, a smartphone or the like. 
         [0037]    Referring particularly to  FIG. 1 , the information processing terminal  100  includes a CPU  101  (e.g., a processor), a RAM (Random Access Memory)  102 , a nonvolatile memory  103 , a sensor  104  (e.g., a detection unit) and a projection apparatus  105  (e.g., an output unit). 
         [0038]    The CPU  101  functions as an arithmetic processing unit and a control apparatus and controls general operation in the information processing terminal  100  in accordance with various programs. The CPU  101  may be a microprocessor. The RAM  102  temporarily stores programs to be used in execution by the CPU  101  and parameters and so forth which vary suitably in the execution. The CPU  101  and the RAM  102  are connected to each other by a host bus configured from a CPU bus or the like. The nonvolatile memory  103  stores programs, calculation parameters and so forth to be used by the CPU  101 . The nonvolatile memory  103  can be formed using, for example, a ROM (Read Only Memory) or a flash memory. 
         [0039]    The sensor  104  includes one or a plurality of detection portions for detecting a variation of the posture of the information processing terminal  100  or a variation of the distance of the information processing terminal  100  to the projection plane. For the sensor  104  which detects a variation of the posture of the information processing terminal  100 , for example, an acceleration sensor or an angular speed sensor as seen in  FIG. 2 or 3  can be used. 
         [0040]    The acceleration sensor detects an acceleration based on a variation of the position of the mass when it is accelerated. A mechanical acceleration sensor, an optical acceleration sensor, a semiconductor sensor of the capacitance type, piezoresistance type, Gaussian temperature distribution type or the like and so forth can be used. For example, it is assumed that the information processing terminal  100  is moved downwardly from an upper position on the plane of  FIG. 2 . At this time, if a three-axis acceleration sensor is provided in the information processing terminal  100 , then the gravitational acceleration can be measured. Consequently, it is possible to detect the direction of gravity with respect to the posture of the terminal and detect the posture of the information processing terminal  100 . 
         [0041]    The angular speed sensor is a sensor such as a gyroscope which detects an angular speed utilizing dynamic inertia or optical interference acting upon a material body. For example, a mechanical angular speed sensor of the rotation type or the oscillation type, an optical angular speed sensor and so forth can be used. For example, it is assumed that the information processing terminal  100  is moved downwardly from an upper position on the plane of  FIG. 3  similarly as in  FIG. 2 . At this time, if an angular speed sensor is provided in the information processing terminal  100 , then it is possible to acquire an angular speed and detect a gradient θ of the information processing terminal  100 . 
         [0042]    The information processing terminal  100  further includes, as the sensor  104 , a distance sensor which can detect the distance from the projection apparatus  105  to the projection plane. 
         [0043]    The projection apparatus  105  is a display apparatus which projects an image or the like to the projection plane (e.g., a projection surface) of the projection target body such as a screen to display the image on the projection plane. The projection apparatus  105  can display an image in an expanded scale utilizing, for example, a CRT, liquid crystal or the DPL (registered trademark) (Digital Light Processing). 
         [0044]    Display image displayed by projection by the projection apparatus  105  of the information processing terminal  100  having such a configuration as described above can be operated or controlled by changing the posture of the information processing terminal  100  or the proximity distance of the information processing terminal  100  to the projection plane. Now, a functional configuration of the information processing terminal  100  is described with reference to  FIG. 4 .
   Functional Configuration   
 
         [0046]    The information processing terminal  100  includes a detection section  110 , a movement information acquisition section  120 , a display information processing section  130 , a projection section  140 , and a setting storage section  150 . 
         [0047]    The detection section  110  detects a variation of the posture of the information processing terminal  100  or a variation of the proximity distance to the projection plane. The detection section  110  corresponds to the sensor  104  shown in  FIG. 1  and can be implemented by an acceleration sensor, an angular speed sensor, a distance sensor or the like. The information processing terminal  100  acquires and outputs the detected direction of gravity, angular speed of the information processing apparatus  100  and proximity distance to the projection plane to the movement information acquisition section  120 . 
         [0048]    The movement information acquisition section  120  acquires movement information representative of a movement of the information processing terminal  100  such as a posture state or a direction of movement based on a result of detection inputted thereto from the detection section  110 . In particular, the movement information acquisition section  120  decides in what manner the information processing terminal  100  is moved by the user from a variation of the direction of gravity or the acceleration of the information processing terminal  100 . Then, the movement information acquisition section  120  outputs the acquired movement information to the display information processing section  130 . 
         [0049]    The display information processing section  130  determines display information to be projected from the projection section  140  so as to be displayed on the screen or the like based on the movement information inputted thereto from the movement information acquisition section  120 . For example, if the display information processing section  130  recognizes, for example, from the movement information that the posture of the information processing terminal  100  has changed, then it changes the display information to be displayed from the projection section  140  in response to the posture variation. At this time, the display information processing section  130  decides, from the movement information, an operation input to the display information displayed on the projection plane and changes the display information. The display information processing section  130  can refer to the setting storage section  150  hereinafter described to decide the carried out operation input using the display information currently displayed and the movement information. 
         [0050]    By varying the posture of the information processing terminal  100  itself or varying the distance from the information processing terminal  100  to the projection plane in this manner, the display information projected on the projection plane can be operated. The display information processing section  130  outputs the display information to the projection section  140 . It is to be noted that the movement information acquisition section  120  and the display information processing section  130  function as an information processing apparatus which changes the display information in response to an operation input to the display information projected on the information processing terminal  100 . 
         [0051]    The projection section  140  projects display information of an image or the like to the projection plane. The projection section  140  is, for example, a projector and corresponds to the projection apparatus  105  shown in  FIG. 1 . The user can observe the display information outputted from the projection section  140  to the projection plane and move the information processing terminal  100  to operate or control the display information. 
         [0052]    The setting storage section  150  is a storage section for storing information to be used for a display controlling process for varying the display information in response to a posture variation or the like of the information processing terminal  100  and corresponds to the RAM  102  or the nonvolatile memory  103  shown in  FIG. 1 . The setting storage section  150  stores, for example, a corresponding relationship between a signal representative of a detection result of the detection section  110  and a direction of gravity, an angular speed, a distance from the projection plane and so forth. Further, the setting storage section  150  stores a corresponding relationship between display information and movement information displayed currently and a changing process of the display information, that is, a changing process of display information corresponding to an operation input and so forth. The information mentioned is referred to by the movement information acquisition section  120 , display information processing section  130  and so forth. The information stored in the setting storage section  150  may be set in advance or may be set suitably by the user. 
       &lt;2. Display Control by the Information Processing Apparatus&gt; 
       [0053]    The information processing terminal  100  changes the display information to be projected to the projection plane from the projection section  140  in response to a posture variation and so forth of the information processing terminal  100 . In the following, a display controlling process by the information processing terminal  100  is described with reference to  FIGS. 5 to 13 . 
       2-1. Change of Display Information by Translational Movement of the Information Processing Terminal 
       [0054]    First, a changing process of display information when the information processing terminal  100  is moved translationally is described as an example of the display controlling process by the information processing terminal  100  with reference to  FIGS. 5 and 6 . It is to be noted that also the display controlling process by the information processing terminal  100  hereinafter described is carried out in accordance with a flow chart of  FIG. 5 . 
         [0055]    With the information processing terminal  100  according to the present embodiment, the range of display information to be displayed on the projection plane can be changed by the user moving the information processing terminal  100  translationally along the projection plane. For example, in the example illustrated in  FIG. 6 , a map is displayed as display information (e.g., a first image) on a projection plane  200 . In a state illustrated in an upper figure of  FIG. 6 , only a portion  202 A of an entire map  202  is displayed on the projection plane  200 . If, in this state, the information processing terminal  100  is moved translationally by the user, for example, in an x direction along the projection plane, then the substance of the map  202  displayed on the projection plane  200  is changed from the display substance of the portion  202 A to the display substance of another portion  202 B (e.g., a second image). 
         [0056]    Referring to  FIG. 5 , such display controlling process is started from decision of whether or not an operation of the projection section  140  has been carried out by the movement information acquisition section  120  at step S 100 . For example, when the movement information acquisition section  120  detects a projection starting signal for starting projection of display information by the projection section  140  of the information processing terminal  100 , then it starts a display controlling process of display information to be projected on the projection plane  200 . The projecting starting signal is outputted, for example, if a switch or the like provided on the information processing terminal  100  is depressed, then projection of display information by the projection section  140  is enabled. The movement information acquisition section  120  does not start the display controlling process of display information to be projected on the projection plane  200  before the projection starting signal is detected, and the process at step S 100  is repeated. 
         [0057]    If it is detected that an operation of the projection section  140  is started, then the movement information acquisition section  120  decides at step S 110  whether or not the information processing terminal  100  exhibits some movement. The movement information acquisition section  120  decides from a result of the detection by the detection section  110  whether or not the posture of the information processing terminal  100  exhibits some variation or whether or not the proximity distance to the projection plane  200  exhibits some variation. Then, if the information processing terminal  100  exhibits some movement, then the movement information acquisition section  120  outputs the movement information of the information processing terminal  100  to the display information processing section  130 . The display information processing section  130  changes the display information displayed on the projection plane  200  in response to the movement of the information processing terminal  100  based on the display information displayed at present and the movement information at step S 120 . The display information after the change is outputted to the projection section  140  so that it is displayed on the projection plane  200  by the projection section  140 . 
         [0058]    In the example illustrated in  FIG. 6 , a process of moving the eye point of the map  202  displayed by the information processing terminal  100  through translational movement of the information processing terminal  100  when the map  202  is displayed is carried out. The substance of such process is stored in the setting storage section  150 . Here, the translational movement of the information processing terminal  100  can be detected by extracting a component of the movement of the information processing terminal  100 , for example, depending upon the variation of the acceleration which can be detected by an acceleration sensor or the variation of the angular speed which can be detected by the angular acceleration sensor as described hereinabove. Or, in the case where the information processing terminal  100  includes a camera not shown for picking up an image in the projection direction of the projection section  140 , the movement information acquisition section  120  can pick up an image in the projection direction by means of the camera and extract a component of the movement of the information processing terminal  100  from a variation of the picked up image. 
         [0059]    When the component of the movement of the information processing terminal  100  is extracted, then the movement information acquisition section  120  outputs the component of the movement as movement information to the display information processing section  130 . The display information processing section  130  determines an amount of movement of the display information to be projected, that is, a display information movement amount, in response to the amount of movement by which the information processing terminal  100  is moved translationally based on the movement information. Then, the display information processing section  130  determines the portion  202 B moved by the display information movement amount from the portion  202 A displayed in the upper figure of  FIG. 6  from within the map  202  displayed on the projection plane  200  as new display information and outputs the new display information to the projection section  140 . 
         [0060]    In this manner, if the user moves the information processing terminal  100  translationally, then also the eye point of the display information to be projected on the projection plane  200  moves correspondingly and the display information to be projected on the projection plane  200  varies. Thereafter, for example, if a predetermined operation such as depression of a switch is carried out and a projecting ending signal for ending the operation by the projection section  140  is detected, then the operation of the projection section  140  is ended at step S 130 . However, until after the projecting ending signal is detected, the processes beginning with step S 110  are carried out repetitively. 
         [0061]    The display controlling process in the case where the user moves the information processing terminal  100  translationally along the projection plane so that the information processing terminal  100  changes the range of the display information to be displayed on the projection plane  200  is described above. The user can carry out an operation for changing the display information to be projected on the projection plane  200  only by moving the information processing terminal  100  translationally above the projection plane  200 . 
       2-2. Change of Display Information by a Gradient of the Information Processing Terminal 
       [0062]    Now, a display controlling process for controlling the eye point for a content projected on the projection plane  200  by the information processing terminal  100  according to the present embodiment is described with reference to  FIG. 7 . 
         [0063]    In the present example, if the gradient from within the posture of the information processing terminal  100  with respect to the projection plane  200  is varied, then the eye point of a content to be projected by the information processing terminal  100 , that is, a direction of the line of sight, is controlled and the substance of the display information to be projected varies. For example, if the projection section  140  of the information processing terminal  100  is directed toward the projection plane  200  to start projection, then a portion  204 A of a content such as, for example, a photograph  204  is displayed on the projection plane  200  as seen from a left figure of  FIG. 7 . At this time, the information processing terminal  100  is directed downwardly, that is, in the negative direction of the x axis, and the portion  204 A of the photograph  204  when it is viewed in the direction of a downward line of sight is displayed. 
         [0064]    It is assumed that, in this state, for example, the information processing terminal  100  is directed upwardly, that is, in the positive direction of the x axis and the posture of the information processing terminal  100  is changed as seen in a right figure of  FIG. 7 . At this time, since the gradient of the information processing terminal  100  with respect to the projection plane  200  varies, the movement information acquisition section  120  acquires the gradient of the information processing terminal  100  with respect to the projection plane  200  and outputs the acquired gradient to the display information processing section  130 . 
         [0065]    The display information processing section  130  determines an amount of movement of the display information to be projected, that is, a display information movement amount, in response to a variation of the gradient of the information processing terminal  100  with respect to the projection plane  200  based on the movement information. Then, the display information processing section  130  determines, from within the photograph  204  displayed on the projection plane  200 , a portion  204 B moved by the display information movement amount from the portion  204 A displayed in a left figure of  FIG. 7  as new display information and outputs the new display information to the projection section  140 . Consequently, the portion  204 B of the photograph  204  when viewed in the direction of the obliquely upwardly directed line of sight is displayed as seen in a right figure of  FIG. 7 . 
         [0066]    The display controlling process in the case where the user tilts the information processing terminal  100  with respect to the projection plane so that the information processing terminal  100  changes the range of the display information to be displayed on the projection plane  200  is described above. The user can carry out an operation for changing the display information to be projected to the projection plane  200  only by varying the gradient of the information processing terminal  100  with respect to the projection plane  200 . 
       2-3. Scroll of Display Information by a Gradient of the Information Processing Terminal 
       [0067]    Now, an example wherein an operation of display information displayed on the projection plane  200  is carried out in response to a posture variation of the information processing terminal  100  according to the present embodiment is described with reference to  FIGS. 8 to 10 . 
         [0068]    In the present example, an example is studied wherein an object list  210  formed from a plurality of objects  210   a,    210   b,    210   c, . . .  is displayed on the projection plane  200 . At this time, the information processing terminal  100  detects a rotational movement of the information processing terminal  100  itself in a predetermined direction and scrolls the object list  210  in the direction. 
         [0069]    For example, an object list  210  including a plurality of objects  210   a,    210   b,    210   c  and  210   d  arrayed in a y direction is displayed on the projection plane  200  as seen in a left figure of  FIG. 8 . At this time, if the user rotates the information processing terminal  100  in a predetermined direction, here in the array direction of the object list  210 , that is, in the y direction, then the detection section  110  outputs a detection result in response to the movement of the information processing terminal  100 . The movement information acquisition section  120  acquires a rotational direction in the y direction of the information processing terminal  100  from the detection result of the detection section  110 . 
         [0070]    The rotational direction in the y direction signifies a direction of a y-direction component when the information processing terminal  100  is tilted with respect to the projection plane  200  with reference to the z axis perpendicular to the projection plane  200 . When the display information processing section  130  detects from the movement information that the information processing terminal  100  is tilted in the y-axis positive direction, then it varies the display information so that the object list  210  is scrolled in the y-axis positive direction. On the other hand, if the display information processing section  130  detects from the movement information that the information processing terminal  100  is tilted in the y-axis negative direction, then it varies the display information so that the object list  210  is scrolled in the y-axis negative direction. 
         [0071]    For example, it is assumed that the posture of the information processing terminal  100  varies from a state in which it is directed in an obliquely downward direction of the line of sight to another state as seen in a left figure of  FIG. 8  in which it is directed in an obliquely upward direction of the line of sight as seen in a right figure of  FIG. 8 . At this time, since the information processing terminal  100  is inclined in the y-axis negative direction, the object list  210  is scrolled in the y-axis negative direction as seen in a right figure of  FIG. 8 . Consequently, for example, the objects  210   c,    210   d,    210   e  and  210   f  are displayed on the projection plane  200 . In this manner, it is possible to scroll the projected object list  210  by varying the gradient of the information processing terminal  100  with respect to the projection plane  200 . 
         [0072]    Here, the gradient of the information processing terminal  100  and the display position of the information processing terminal  100  of all objects which configure the object list  210  may correspond one by one to each other. Or the information processing terminal  100  may be configured otherwise such that scrolling is carried out continuously while the information processing terminal  100  is inclined by more than a predetermined angle from a reference position as seen in  FIG. 9 or 10 . 
         [0073]    In the example illustrated in  FIG. 9 , when an object list  210  formed from a plurality of objects  210   a,    210   b,    210   c, . . .  is displayed on the projection plane  200  similarly as in the case of  FIG. 8 , the information processing terminal  100  detects a rotational movement in a predetermined direction of the information processing terminal  100  and scrolls the object list  210  in the direction. At this time, the movement information acquisition section  120  acquires the gradient of the information processing terminal  100  with respect to the reference position which is the z direction perpendicular to the projection plane  200  from the detection result of the detection section  110 . It is to be noted that the reference position may be determined based on the positional relationship to the projection plane  200 . Then, the display information processing section  130  decides whether or not the gradient of the information processing terminal  100  from the reference position is greater than the predetermined angle. If the gradient is greater than the predetermined angle, then the display information processing section  130  scrolls the object list  210  continuously in the rotational direction of the information processing terminal  100 . 
         [0074]    For example, it is assumed that the information processing terminal  100  is inclined in the y-axis positive direction as seen in an upper figure of  FIG. 9  and the gradient θ of the information processing terminal  100  from the reference position is greater than the predetermined angle. At this time, the display information processing section  130  continuously scrolls the object list  210  displayed on the projection plane  200  in the y-axis positive direction. On the other hand, it is assumed that the information processing terminal  100  is inclined in the y-axis negative direction and the gradient θ of the information processing terminal  100  from the reference position is greater than the predetermined angle. At this time, the display information processing section  130  continuously scrolls the object list  210  displayed on the projection plane  200  in the y-axis negative direction. 
         [0075]    It is to be noted that, in the case where the gradient of the information processing terminal  100  from the reference position is smaller than the predetermined angle, the object list  210  is scrolled in the rotational direction in response to the magnitude of the gradient θ of the information processing terminal  100 . 
         [0076]    Further, while scrolling of the object list  210  formed from a plurality of objects arrayed in the projection plane  200  erected in the vertical direction is described above with reference to  FIG. 9 , also in the case where the projection plane  200  is placed horizontally as seen in  FIG. 10 , display control is carried out similarly. In  FIG. 10 , the projection plane  200  is provided on a horizontal plane perpendicular to the vertical direction, and objects  210   a,    210   b,    210   c, . . .  are arrayed in a predetermined direction, for example, in the x direction, along a horizontal plane. Also in this instance, the information processing terminal  100  detects a rotational movement of the information processing terminal  100  in a predetermined direction and scrolls the object list  210  in the direction. 
         [0077]    At this time, the movement information acquisition section  120  acquires the gradient of the information processing terminal  100  from a reference position which is the z direction perpendicular to the projection plane  200  from a result of the detection by the information processing terminal  100 . Then, the display information processing section  130  decides whether or not the gradient of the information processing terminal  100  from the reference position is equal to or greater than the predetermined angle. If the gradient is equal to or greater than the predetermined angle, then the display information processing section  130  continuously scrolls the object list  210  in the rotational direction of the information processing terminal  100 . 
         [0078]    For example, it is assumed that the information processing terminal  100  is inclined in the x-axis negative direction and the gradient θ of the information processing terminal  100  from the reference position is equal to or greater than the predetermined angle as seen in a left figure of  FIG. 10 . At this time, the display information processing section  130  continuously scrolls the object list  210  displayed on the projection plane  200  in the x-axis negative direction. On the other hand, it is assumed that the information processing terminal  100  is inclined in the x-axis positive direction and the gradient θ of the information processing terminal  100  from the reference position is equal to or greater than the predetermined angle as seen in a right figure of  FIG. 10 . At this time, the display information processing section  130  continuously scrolls the object list  210  displayed on the projection plane  200  in the x-axis positive direction. 
         [0079]    It is to be noted that, in the case where the gradient of the information processing terminal  100  from the reference position is smaller than the predetermined angle, the object list  210  is scrolled in the rotational direction in response to the magnitude of the gradient θ of the information processing terminal  100 . The projected object list  210  can be scrolled by varying the gradient of the information processing terminal  100  with respect to the projection plane  200  in this manner. 
         [0000]    2-4. Object Selection Operation from within an Object Group 
         [0080]    The detection section  110  of the information processing terminal  100  according to the present embodiment can detect also the proximity distance of the information processing terminal  100  with respect to the projection plane  200 . Thus, the information processing terminal  100  according to the present embodiment can carry out also an operation for selecting a desired object from within an object group formed from a plurality of objects in response to the proximity distance. In the following, a display controlling process of display information to be displayed on the projection plane  200  when an operation for selecting an object from within an object group is carried out by the information processing terminal  100  is described with reference to  FIG. 11 . 
         [0081]    It is assumed that display information to be projected from the projection section  140  of the information processing terminal  100  is an object group  220  formed from a plurality of objects  222  as seen in  FIG. 11 . When the projection section  140  of the information processing terminal  100  is spaced by a distance Z 1  from the projection plane  200 , the objects  222  are displayed in an array of 4×4 grating on the projection plane  200  as seen in a left figure of  FIG. 11 . In the present example, the display information processing section  130  varies the number of objects  222  to be displayed from within the object group  220  in response to the proximity distance of the information processing terminal  100  to the projection plane  200 . 
         [0082]    For example, as the distance of the information processing terminal  100  to the projection plane  200  decreases, the display information processing section  130  decreases the number of objects  222  to be displayed on the projection plane  200  and finally displays only one object  222 . By decreasing the number of objects  222  to be displayed on the projection plane  200  in this manner, it is possible to narrow down the objects  222  of the object group  220  such that a single object  222  can be selected finally. 
         [0083]    In  FIG. 11 , when the information processing terminal  100  is moved toward the projection plane  200  to vary the distance from the projection plane  200  to the information processing terminal  100  from the distance Z 1  to another distance Z 2 , the number of objects  222  displayed on the projection plane  200  is decreased as seen in a figure centrally in  FIG. 11 . Those objects  222  to be displayed as selection candidates when the information processing terminal  100  is moved toward the projection plane  200  to narrow down the objects  222  are determined in response to the position of the information processing terminal  100  with respect to the projection plane  200 . 
         [0084]    For example, it is assumed that the information processing terminal  100  approaches the projection plane  200  while it is moved in the x-axis positive direction and the y-axis negative direction toward a position above a desired object  222   a.  Thereupon, only 3×3 objects  222  centered at the object  222   a  from within the projection plane  200  are displayed. In this manner, the selection target can be narrowed down from 4×4 objects  222  to 3×3 objects  222 . 
         [0085]    Further, if the information processing terminal  100  is moved toward the projection plane  200  to approach the desired object  222   a  until the distance from the projection plane  200  to the information processing terminal  100  becomes equal to a distance Z 3 , then the display information processing section  130  causes only the desired object  222   a  to be displayed as seen in a right figure of  FIG. 11 . The object  222   a  can be selected by causing only the desired object  222   a  to be displayed in this manner. Thereafter, if a predetermined operation such as to depress a button provided on the information processing terminal  100  is carried out, then a function, for example, associated with the object  222   a  can be executed. 
         [0086]    It is to be noted that, while, in the example described above, the display information processing section  130  changes the display information depending upon whether or not the proximity distance between the projection plane  200  and the information processing terminal  100  exceeds any of the distances Z 1  to Z 3  set in advance, the present disclosure is not limited to this example. For example, the display information may be varied continuously in response to the proximity distance between the projection plane  200  and the information processing terminal  100 . 
         [0087]    By varying the proximity distance between the information processing terminal  100  including the projection section  140  and the projection plane  200  in this manner, narrowing down or selection of display information displayed on the projection plane  200  can be carried out. Since the user can operate display information only by varying the position of the information processing terminal  100  with respect to the projection plane  200 , it can carry out an operation intuitively. 
         [0000]    2-5. Zoom processing in Response to the Proximity Distance between the Information Processing Terminal and a Projection Plane 
         [0088]    As another example of operating display information displayed on the projection plane  200  using the proximity distance between the projection plane  200  and the information processing terminal  100 , for example, also it is possible to change the display granularity of display information displayed on the projection plane  200  in response to the proximity distance. 
         [0089]    Referring to  FIG. 12 , it is assumed that, for example, a map  230  is projected as display information to the projection plane  200  by the projection section  140  of the information processing terminal  100 . When the information processing terminal  100  and the projection plane  200  are spaced away from each other as seen in a left figure of  FIG. 12 , a map  230 A for a wide area is displayed on the projection plane  200 . If, in this state, the information processing terminal  100  is moved in the z direction toward the projection plane  200 , then a zoomed map  230 B is displayed on the projection plane  200  as seen in a right figure of  FIG. 12 . 
         [0090]    The zoom process of the display information is carried out, for example, by varying the display granularity in response to the proximity distance around an intersecting point of a perpendicular from the projection section  140  of the information processing terminal  100  to the projection plane  200  with the projection plane  200 . As the proximity distance between the information processing terminal  100  and the projection plane  200  decreases, the display granularity increases and the display information is displayed in a correspondingly expanded state. 
         [0091]    Consequently, the user can carry out zoom-in/zoom-out of display information displayed on the projection plane  200  by moving the information processing terminal  100  toward or away from the projection plane  200 , and can carry out an operation intuitively. 
         [0092]    As another example wherein the display granularity of display information displayed on the projection plane  200  is changed in response to the proximity distance, it is possible to change the display granularity of a GUI in response to the proximity distance as seen in  FIG. 13 . It is assumed that, for example, a plurality of objects  241 ,  242 ,  243  and  244  are displayed on the projection plane  200  as seen in a left figure of  FIG. 13 . The objects  241 ,  242 ,  243  and  244  are representative icons representing general substances, and objects belonging to the same group are associated with each of the objects  241 ,  242 ,  243  and  244 . 
         [0093]    If the information processing terminal  100  is moved toward the projection plane  200 , then objects are developed in response to the proximity distance. An object which is to make a target of the development may be that object to which the information processing terminal  100  is positioned most closely. For example, it is assumed that, in a state illustrated in a left figure of  FIG. 13 , the information processing terminal  100  is moved in the x-axis positive direction and the y-axis negative direction toward a position above the objects  244  to approach the projection plane  200 . The display information processing section  130  recognizes the movement of the information processing terminal  100  from the movement information and develops the object  244  such that it causes objects  244   a,    244   b,    244   c  and  244   d  associated with the object  244  to be displayed on the projection plane as seen in a central figure of  FIG. 13 . 
         [0094]    Thereafter, if the information processing terminal  100  further approaches the projection plane  200 , then only that object in the proximity of which the information processing terminal  100  is positioned is displayed. For example, if the information processing terminal  100  approaches the projection plane  200  toward the object  244   a  as seen in a right figure of  FIG. 13 , then only the object  244   a  is displayed on the projection plane  200 . By causing only the desired object  244   a  to be displayed in this manner, the object  244   a  can be selected. Thereafter, if a predetermined operation such as to depress a button provided on the information processing terminal  100  or the like is carried out, then a function, for example, associated with the object  244   a  can be executed. 
         [0095]    It is to be noted that, while, in the example illustrated in  FIG. 13 , the number of times by which development of an object is carried out is one time, the present disclosure is not limited to this. The objects may be arranged in a plurality of hierarchical layers. At this time, the information processing terminal  100  may change a hierarchical layer to be displayed in response to the proximity distance thereof to the projection plane  200 . Further, while, in the examples illustrated in  FIGS. 12 and 13 , the display information processing section  130  continuously varies the display information in response to the proximity distance between the projection plane  200  and the information processing terminal  100 , the present disclosure is not limited to this. For example, the display information may be changed depending upon whether or not the proximity distance between the projection plane  200  and the information processing terminal  100  exceeds a distance threshold value set in advance as in the example of  FIG. 11 . 
         [0096]    The configuration of the information processing terminal  100  including the projection section  140  according to the present embodiment and the display controlling process by the information processing terminal  100  have been described above. The information processing terminal  100  according to the present embodiment can vary a virtual eye point for display information to be projected on the projection plane  200  by varying the posture of the information processing terminal  100 . Consequently, the information processing terminal  100  makes it possible for a user to browse display information, particularly a content of a 3D image or an omnidirectional image, with an immersion feeling. 
         [0097]    Further, by varying the posture of the information processing terminal  100 , a display region changing operation, a scrolling operation, a selection operation or the like of display information to be displayed on the projection plane  200  can be carried out. The user can carry out an operation intuitively while watching the projected display information. Further, by varying the proximity distance between the information processing terminal  100  and the projection plane  200 , zoom-in/zoom-out of display information of a map or the like or a development operation of display information can be carried out, and the user can carry out an operation intuitively. 
         [0098]    While several embodiments of the present disclosure have been described above with reference to the accompanying drawings, the present disclosure is not limited to these embodiments. It is apparent that a person skilled in the art could have made various alterations or modifications without departing from the spirit and scope of the disclosure as defined in claims, and it is understood that also such alterations and modifications naturally fall within the technical scope of the present disclosure. 
         [0099]    It is to be noted that, while, in the description of the embodiment, the z axis perpendicular to the projection plane  200  is set as a reference position, the present disclosure is not limited to this. For example, the user may set a reference position upon starting of projection by the projection section  140  of the information processing terminal  100 , or the reference position may be set by calibration upon starting of use of the information processing terminal  100 .