Patent Publication Number: US-2017374212-A1

Title: Information processing apparatus, information processing system, and image forming apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based on and claims priority under 35 USC 119 from Japanese Patent Application No. 2016-124494 filed Jun. 23, 2016. 
     BACKGROUND 
     (i) Technical Field 
     The present invention relates to an information processing apparatus, an information processing system, and an image forming apparatus. 
     (ii) Related Art 
     In some cases, displays of information processing apparatuses display in the form of a display image a list of functions relating to apparatuses that includes the displays. In a typical method in such cases, the user selects a target function from the list. 
     SUMMARY 
     According to an aspect of the present invention, an information processing apparatus includes a display, an operating unit, and a controller. The display displays in a form of a display image a list of plural functions relating to the information processing apparatus. The operating unit accepts a selecting operation in which a user selects his or her target function from the list of the plural functions. The controller performs control so that the list of the plural functions includes a function or functions relating to a position in a line of sight of the user. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Exemplary embodiment of the present invention will be described in detail based on the following figures, wherein: 
         FIG. 1  illustrates an information processing system according to an exemplary embodiment; 
         FIG. 2  is the appearance of an image forming apparatus according to the present exemplary embodiment; 
         FIG. 3  illustrates an internal structure of the image forming apparatus according to the present exemplary embodiment; 
         FIG. 4  is an example of a display image displayed in the user interface; 
         FIG. 5  is a block diagram illustrating an example of a functional configuration of a control device; 
         FIG. 6  is a flowchart illustrating a first example of operations of the control device; 
         FIG. 7  illustrates an example of a list of functions displayed in a user interface when the position watched by the user is a document transport unit; 
         FIG. 8  illustrates an example of a list of functions displayed in the user interface when the position watched by the user is a manual feed tray; 
         FIG. 9  is a flowchart illustrating a second example of the operations of the control device; and 
         FIG. 10  is an example of a display image displayed in the user interface according to the second example. 
     
    
    
     DETAILED DESCRIPTION 
     An exemplary embodiment will be described in detail below with reference to the accompanying drawings. 
     Description of an Overall Structure of an Information Processing System 
       FIG. 1  illustrates an information processing system according to an exemplary embodiment. 
     As illustrated in  FIG. 1 , an information processing system S includes a detection device  500  and an image forming apparatus (information processing apparatus)  1 . The detection device  500  serves as an example of a detector that detects a line of sight of a user. The image forming apparatus  1  forms an image on a recording material. 
     Description of the Detection Device  500   
     The detection device  500  includes a camera  510  and a processing device  520 . The camera  510  is used to take an image of the user. The processing device  520  obtains the line of sight of the user in accordance with the image taken by the camera  510 . 
     The camera  510  includes, for example, an optical system and an image sensor. The optical system converges light incident thereupon. The image sensor is an imaging device that detects the light having been converged by the optical system. 
     The optical system includes a single lens or plural lenses combined with one another. Various types of aberrations are eliminated by a combination of the lenses, coatings provided on the surfaces of the lenses, and so forth. The image sensor includes imaging elements such as charge coupled devices (CCDs) or complementary metal oxide semiconductors (CMOSs) arranged therein. 
     The processing device  520  analyzes the image taken by the camera  510  and detects the line of sight of the user in accordance with the analysis of the image. Here, the line of sight of the user refers to, for example, information about what is a target watched by the user, and furthermore, includes, for example, information about the size of the pupil, information about whether or not the user intensely watches the target, and so forth. 
     The processing device  520  extracts, for example, parts of the user such as the face and the eye from the image taken by the camera  510  and detects the line of sight of the user in accordance with the orientation of the face, the position of the pupil in the eye, and the like. 
     Description of an Overall Structure of the Image Forming Apparatus  1   
       FIG. 2  is the appearance of the image forming apparatus  1  according to the present exemplary embodiment.  FIG. 3  is an internal structure of the image forming apparatus  1  according to the present exemplary embodiment. 
     The image forming apparatus  1  includes an image reading device  100  that reads an image on an original document and an image recording device  200  that records the image on the recording material (“recording material” is also representatively referred to as “sheet P” hereafter. Also, “sheet P” is described in the plural form “sheets P” where appropriate). Furthermore, the image forming apparatus  1  includes a user interface (UI)  300  that accepts operating input performed by the user and displays various types of information for the user. Furthermore, the image forming apparatus  1  includes a control device  400  that controls operations of the entirety of the image forming apparatus  1 . 
     The image reading device  100  is disposed on an upper portion of the image forming apparatus  1 . The image recording device  200  is disposed below the image reading device  100 . The control device  400  is disposed in the image recording device  200 . The user interface  300  is disposed in an upper central portion on the front side of the image processing apparatus  1 , that is, on the front side of a central portion of an image reading unit  110 , which will be described later, of the image reading device  100 . 
     First, the image reading device  100  is described. 
     The image reading device  100  includes the image reading unit  110  that reads the image of the original document and a document transport unit  120  that transports the original document to the image reading unit  110 . The document transport unit  120  is disposed in an upper portion of the image reading device  100 . The image reading unit  110  is disposed in a lower portion the image reading device  100 . 
     The document transport unit  120  includes a document loader  121  and a document output unit  122 . The document loader  121  contains the original document. The original document transported from the document loader  121  is output to the document output unit  122 . Thus, the original document is transported from the document loader  121  to the document output unit  122 . The document transport unit  120  is also referred to as an auto document feeder (ADF). 
     The image reading unit  110  includes a platen glass  111 , a light radiation unit  112 , a light guide unit  113 , and an imaging lens  114 . The light radiation unit  112  radiates light toward a target side (image side) of the original document. The light guide unit  113  guides light L radiated by the light radiation unit  112  toward the target side of the original document and reflected at the target side of the original document. The imaging lens  114  focuses an optical image of the light L guided by the light guide unit  113 . Furthermore, the image reading unit  110  includes a detection unit  115  and an image processing unit  116 . The detection unit  115  includes a photoelectric converter such as a CCD image sensor that photoelectrically converts the light L having been focused by the imaging lens  114 , so that the detection unit  115  detects the focused optical image. The image processing unit  116  is electrically connected to the detection unit  115 , so that an electric signal as image information obtained by the detection unit  115  is transmitted to the image processing unit  116 . 
     The image reading unit  110  reads an image of the original document transported by the document transport unit  120  and an image of the original document placed on the platen glass  111 . 
     Next, the image recording device  200  is described. 
     The image recording device  200  includes an image forming section  20 , a sheet feed unit  60 , a sheet output unit  70 , and an inversion transport unit  80 . The image forming section  20  forms an image on the sheet P. The sheet feed unit  60  feeds the sheet P to the image forming section  20 . The sheet output unit  70  outputs the sheet P on which the image has been formed by the image forming section  20 . The inversion transport unit  80  inverts the sheet P on one side of which the image has been formed by the image forming section  20  while transporting again the sheet P toward the image forming section  20 . 
     The image forming section  20  includes four image forming units  21 Y,  21 M,  21 C, and  21 K for yellow (Y), magenta (M), cyan (C), and black (K). The image forming units  21 Y,  21 M,  21 C, and  21 K are arranged parallel to one another and spaced from one another with a certain distance set therebetween. The image forming units  21  include respective photosensitive drums  22 , respective chargers  23 , and respective developing devices  24 . The chargers  23  uniformly charge the surfaces of the respective photosensitive drums  22 . The developing devices  24  each develop an electrostatic latent image formed by laser radiation performed by an optical system unit  50 , which will be described later, with toner of a corresponding one of predetermined color components so as to make visible the electrostatic latent image. Furthermore, the image forming section  20  is provided with toner cartridges  29 Y,  29 M,  29 C, and  29 K that supply toner of the colors to the developing devices  24  of the respective image forming units  21 Y,  21 M,  21 C, and  21 K. 
     The image forming section  20  includes the optical system unit  50  below the image forming units  21 Y,  21 M,  21 C, and  21 K. The optical system unit  50  radiates laser light toward the photosensitive drums  22  of the image forming units  21 Y,  21 M,  21 C, and  21 K. The optical system unit  50  includes a semiconductor laser (not illustrated) and a modulator (not illustrated). The optical system unit  50  also includes a polygon mirror (not illustrated), a window (not illustrated) and a frame (not illustrated). The polygon mirror deflects and scans the laser light emitted from the semiconductor laser. The window formed of glass allows the laser light to pass therethrough. The frame tightly encloses the elements of the optical system unit  50 . 
     Furthermore, the image forming section  20  includes an intermediate transfer unit  30 , a second transfer unit  40 , and a fixing device  45 . The intermediate transfer unit  30  performs multi-transfer, through which the toner images of the colors formed on the photosensitive drums  22  of the image forming units  21 Y,  21 M,  21 C, and  21 K are transferred onto an intermediate transfer belt  31 . The second transfer unit  40  transfers the toner images superposed on the intermediate transfer unit  30  onto the sheet P. The fixing device  45  fixes the toner images formed on the sheet P by applying heat and pressure. 
     The intermediate transfer unit  30  includes the intermediate transfer belt  31 , a drive roller  32 , and a tension roller  33 . The drive roller  32  drives the intermediate transfer belt  31 . The tension roller  33  applies a certain amount of tension to the intermediate transfer belt  31 . The intermediate transfer unit  30  also includes first transfer rollers  34  and a backup roller  35 . Two or more (four according to the present exemplary embodiment) of the first transfer rollers  34  face the photosensitive drums  22  with the intermediate transfer belt  31  interposed therebetween and transfers the toner images formed on the photosensitive drums  22  onto the intermediate transfer belt  31 . The backup roller  35  faces a second transfer roller  41 , which will be described later, with the intermediate transfer belt  31  interposed therebetween. 
     The intermediate transfer belt  31  is looped over plural rotating members including, for example, the drive roller  32 , the tension roller  33 , the first transfer rollers  34 , the backup roller  35 , and a driven roller  36 . The intermediate transfer belt  31  is rotated in an arrow direction at a predetermined speed by the drive roller  32  rotated by a drive motor (not illustrated). The intermediate transfer belt  31  is formed of, for example, rubber or resin. 
     The intermediate transfer unit  30  also includes a cleaner  37  that removes residual toner and the like existing on the intermediate transfer belt  31 . The cleaner  37  removes the residual toner, paper dust, and the like from the surface of the intermediate transfer belt  31  after the toner images have been transferred. 
     The second transfer unit  40  includes the second transfer roller  41  provided at a second transfer position. The second transfer roller  41  is pressed against the backup roller  35  with the intermediate transfer belt  31  interposed therebetween so as to transfer the images onto the sheet P through second transfer. The second transfer position is formed by the second transfer roller  41  and the backup roller  35  that faces the second transfer roller  41  with the intermediate transfer belt  31  interposed therebetween. At the second transfer position, the toner images having been transferred onto the intermediate transfer belt  31  are transferred onto the sheet P. 
     The fixing device  45  fixes onto the sheet P the images (toner images) having been transferred onto the sheet P through the second transfer performed by the intermediate transfer unit  30 . This fixing of the images is performed by utilizing heat and pressure with a heating fixing roller  46  and a pressure roller  47 . 
     The sheet feed unit  60  includes sheet containers  61 , feed rollers  62 , a transport path  63 , and transport rollers  64 ,  65 , and  66 . The sheet containers  61  contain the sheets P on which images are to be formed. The feed rollers  62  feed sheets P contained in the sheet containers  61 . The sheets P fed by the feed rollers  62  are transported through the transport path  63 . The transport rollers  64 ,  65 , and  66  are disposed along the transport path  63  so as to transport the sheets P fed by the feed rollers  62  to the second transfer position. The sheet feed unit  60  also includes a manual feed tray  67  that allows the sheets to be manually fed. The manual feed tray  67  is openable. Thus, the manual feed tray  67  is opened when in use so as to allow the sheets P to be set therein and closed when not in use.  FIG. 3  illustrates the manual feed tray  67  in a closed state. 
     The sheet output unit  70  includes a first placement tray  71  and a second placement tray  72 . The first placement tray  71  is provided above the image forming section  20  and allows the sheets P on which the images have been formed by the image forming section  20  to be placed thereon. The second placement tray  72  is provided between the first placement tray  71  and the image reading device  100  and allows the sheets P on which the images have been formed by the image forming section  20  to be placed thereon. 
     The sheet output unit  70  also includes a transport roller  75  and a switching gate  76 . The transport roller  75  is provided downstream of the fixing device  45  in a transport direction so as to transport each of the sheets P onto which the toner images have been fixed. The switching gate  76  is provided downstream of the transport roller  75  in the transport direction and switches the transport direction of the sheet P. The sheet output unit  70  also includes a first output roller  77  disposed downstream of the switching gate  76  in the transport direction. The first output roller  77  outputs to the first placement tray  71  the sheet P transported in the transport direction switched to one side (right side of  FIG. 3 ) by the switching gate  76 . The sheet output unit  70  also includes a transport roller  78  and a second output roller  79  disposed downstream of the switching gate  76  in the transport direction. The transport roller  78  transports the sheet P transported in the transport direction switched to the other side (upper side of  FIG. 3 ) by the switching gate  76 . The second output roller  79  outputs the sheet P transported by the transport roller  78  to the second placement tray  72 . 
     The inversion transport unit  80  includes an inversion transport path  81  beside the fixing device  45 . The sheet P is inverted by rotating the transport roller  78  in the opposite direction to the direction in which the transport roller  78  outputs the sheet P to the second placement tray  72  and being transported through the inversion transport path  81 . Plural transport rollers  82  are provided along the inversion transport path  81 . The sheet P transported by these transport rollers  82  are fed to the second transfer position again by the transport rollers  82 . 
     Furthermore, the image recording device  200  includes a device-body frame  11  and a device housing  12 . The device-body frame  11  directly or indirectly supports the image forming section  20 , the sheet feed unit  60 , the sheet output unit  70 , the inversion transport unit  80 , and the control device  400 . The device housing  12  is attached to the device-body frame  11  so as to form the outer surface of the image forming apparatus  1 . 
     The device-body frame  11  includes a reading-device support  13  on one lateral end side of the image forming apparatus  1 . The components such as the switching gate  76 , the first output roller  77 , the transport roller  78 , and the second output roller  79  are disposed in the reading-device support  13 . The reading-device support  13  extends in the up-down direction so as to support the image reading device  100 . The reading-device support  13  cooperates with a portion of the device-body frame  11  on the rear side for supporting the image reading device  100 . 
     Furthermore, the image recording device  200  includes a front covering  15  as part of the device housing  12 . The front covering  15  is provided on the front side of the image forming section  20  and openably attached to the device-body frame  11 . 
     The user is able to replace any of the intermediate transfer unit  30  and the toner cartridges  29 Y,  29 M,  29 C, and  29 K of the image forming section  20  with a new one by opening the front covering  15 . 
     The user interface  300  is, for example, a touch panel. With the touch panel used as the user interface  300 , various types of information such as image forming conditions of the image forming apparatus  1  are displayed in the touch panel. Also according to the present exemplary embodiment, a list of plural functions relating to the image forming apparatus  1  is displayed in the form of a display image. The user performs input operations for the image forming conditions and so forth by touching the touch panel. Also according to the present exemplary embodiment, the user selects his or her target function from the list. That is, the user interface  300  functions as a display that displays in the form of a display image the list of the plural functions relating to the image forming apparatus  1  in which the user interface  300  is included, and the user interface  300  also functions as an operating unit that accepts a selecting operation in which the user selects a target function from the list. The user interface  300  is not necessarily a touch panel. The functions of the display and the functions of the operating unit may be separated. That is, the user interface  300  may include a display and an operating unit separated from each other. In this case, the display includes a liquid crystal display or the like and the operating unit includes physical buttons or the like. 
     Description of the Operations of the Image Forming Apparatus  1   
     The image forming apparatus  1  having the above-described structure operates as follows. 
     For example, the user is able to copy an original document by using the image forming apparatus  1 . That is, the original document is able to be copied by forming an image on the sheet P with the image recording device  200  in accordance with image data of the original document read by the image reading device  100 . Furthermore, the user is able to perform printing by transmitting a print job to the image forming apparatus  1  from a personal computer (PC) or the like (not illustrated) connected to a line of communication. That is, the printing is able to be performed by receiving the print job through the line of communication and forming an image on the sheet P with the image recording device  200  in accordance with image data included in the print job. Furthermore, facsimile communication is usable for the user. That is, image data of an original document read by the image reading device  100  is able to be transmitted through the line of communication. The user is also able to save image data of an original document. That is, the image data of the original document is able to be saved in the image forming apparatus  1  or a PC connected to the line of communication. 
     Here, operations of the image forming apparatus  1  are described in detail with an example in which the user copies an original or performs printing. 
     An image of the original document read by the image reading device  100  and image data received from the PC or the like are subjected to predetermined image processing. The image data on which the image processing has been performed is converted into colorant gradation data of the four colors, that is, yellow (Y), magenta (M), cyan (C), and black (K) and output to the optical system unit  50 . 
     In the optical unit  50 , the laser light emitted from the semiconductor laser (not illustrated) in accordance with the received color gradation data is directed to the polygon mirror through an f-θ lens (not illustrated). With the polygon mirror, the laser light incident thereupon is modulated in accordance with the gradation data of the colors, deflected and scanned, and radiated to the photosensitive drums  22  of the image forming units  21 Y,  21 M,  21 C, and  21 K through an imaging lens (not illustrated) and plural mirrors (not illustrated). 
     The surfaces of the photosensitive drums  22  of the image forming units  21 Y,  21 M,  21 C, and  21 K having been charged by the chargers  23  are exposed to and scanned by the laser light, thereby electrostatic latent images are formed. The electrostatic latent images having been formed are developed into toner images of yellow (Y), magenta (M), cyan (C), and black (K) colors by the respective image forming units  21 Y,  21 M,  21 C, and  21 K. The toner images formed on the photosensitive drums  22  of the image forming units  21 Y,  21 M,  21 C, and  21 K are transferred onto the intermediate transfer belt  31  serving as an intermediate transfer body through multi-transfer. 
     Meanwhile, in the sheet feed unit  60 , the sheet P contained in one of the sheet containers  61  is picked up by rotating a corresponding one of the feed rollers  62  at timing adjusted to timing of image formation. The picked up sheet P is transported through the transport path  63  by the transport rollers  64  and  65 . After that, the transport roller  66  is rotated at timing adjusted to movement timing of the intermediate transfer belt  31  on which the toner images have been formed, thereby transporting the sheet P to the second transfer position formed by the backup roller  35  and the second transfer roller  41 . At the second transfer position, the toner images of four colors superposed on one another are transferred in the sub-scanning direction by using a pressure contact force and a predetermined electric field onto the sheet P being transported upward from below. The sheet P onto which the toner images of the colors have been transferred is subjected to a fixing process of heat and pressure performed by the fixing device  45  and then output and placed on the first placement tray  71  or the second placement tray  72 . 
     When duplex printing is requested, the sheet P on one side of which the images have been formed is transported by the inversion transport unit  80  so as to be inverted, and the sheet P is fed again to the second transfer position. At the second transfer position, the toner images are transferred onto the other side of the sheet P, and the transferred images are fixed by the fixing device  45 . After that, the sheet P on both the sides of which the toner images have been formed is output and placed on the first placement tray  71  or the second placement tray  72 . 
     The user interface  300  operates as follows. 
       FIG. 4  is an example of a display image displayed in the user interface  300 . 
     As has been described, the display image displayed in the user interface  300  is a list of the plural functions relating to the image forming apparatus  1  in which the user interface  300  is included. 
     The example of  FIG. 4  is the list of the functions displayed in the user interface  300  in a standard state. In this case, the user interface  300  displays icons representing the following functions so as to be watched at a glance: “Copy”, “Fax/Internet Fax”, “Scan and Mail”, “Job Flow”, “Print Anywhere”, “Simple Fax Setting”, “Scan to PC”, “External Access”, “Scan to Box”, “Box Operation”, “Job Memory”, and “Camera Print”. 
     In order to use a target function, the user performs a selecting operation to select one of the icons. 
     Specifically, when the user interface  300  is a touch panel, the selecting operation is an operation in which the user touches an icon. However, this is not limiting. When the user interface  300  includes, for example, a liquid crystal display and physical buttons separated from each other, the selecting operation is able to be performed as follows: the user presses down physical arrow buttons to select an icon and similarly presses down a physical determination button. 
     when the number of functions increases, it is impossible to display all the functions in the user interface  300  at a time. In order to address this, the functions may be displayed, for example, in a hierarchic manner. In this case, the user is able to locate a target function by performing selecting operations sequentially from higher to lower levels of the hierarchy. 
     In some cases, it is difficult for the user to recognize where the target function exists. In this case, when the hierarchy is deep, it takes time and effort to navigate up and down the hierarchy. When the hierarchy is shallow and the number of functions displayed per screen is increased, the user takes time to find the target function. 
     According to the present exemplary embodiment, this may be suppressed by controlling with the control device  400  the list of the functions displayed in the user interface  300  as follows. Although the details will be described later, the control device  400  functions as a controller that performs control for displaying in the user interface  300  the list of the functions relating to the position in the line of sight of the user. 
     Description of the Control Device  400   
       FIG. 5  is a block diagram illustrating an example of a functional configuration of the control device  400 . It is noted that, in  FIG. 5 , functions relating to the present exemplary embodiment are selected and illustrated out of the various functions of the control device  400 . 
     As illustrated in  FIG. 5 , the control device  400  according to the present exemplary embodiment includes a line-of-sight determination unit  401 , a process information obtaining unit  402 , a function list determination unit  403 , and a display control unit  404 . The line-of-sight determination unit  401  determines the line of sight of the user. The process information obtaining unit  402  obtains information about a process performed by the image forming apparatus  1 . The function list determination unit  403  determines functions to be displayed in the user interface  300 . The display control unit  404  controls the display image displayed in the user interface  300 . 
     The line-of-sight determination unit  401  obtains information about the line of sight of the user detected by the detection device  500  (see  FIG. 1 ). Thus, the line-of-sight determination unit  401  determines what position is watched by the user. 
     The process information obtaining unit  402  obtains information about a process performed by the image forming apparatus  1  in a present state. For example, when the user transmits in advance a print job from the PC or the like to perform printing by the image forming apparatus  1 , information about this process is obtained. 
     The function list determination unit  403  determines functions to be displayed in the user interface  300  in accordance with the position watched by the user. 
     The display control unit  404  performs control for displaying in the user interface  300  the list of the functions determined by the function list determination unit  403 . Actually, the display control unit  404  generates at a predetermined time interval display image data of the display image to be displayed in the user interface  300  and sequentially outputs the display image data to the user interface  300 . 
     Description of Operations of the Control Device  400  First Example 
     Next, a first example of operations of the control device  400  is described. 
       FIG. 6  is a flowchart illustrating the first example of the operations of the control device  400 . 
     First, the line-of-sight determination unit  401  obtains information about the line of sight of the user detected by the detection device  500  (step S 101 ). Furthermore, the line-of-sight determination unit  401  determines the position watched by the user (step S 102 ). 
     Next, the process information obtaining unit  402  obtains information about a process performed by the image forming apparatus  1  in a present state (step S 103 ). 
     The function list determination unit  403  determines functions to be displayed in the user interface  300  in accordance with the position watched by the user and the type of the process obtained by the process information obtaining unit  402  (step S 104 ). 
     The display control unit  404  performs control for displaying in the user interface  300  a list of the functions determined by the function list determination unit  403  (step S 105 ). 
       FIGS. 7 and 8  are examples of display images displayed in the user interface  300  according to the first example. 
     Among these drawings,  FIG. 7  illustrates an example of the list of the functions displayed in the user interface  300  when the position watched by the user is the document transport unit  120  (see  FIG. 3 ). 
     The list of the functions using the document transport unit  120  is displayed by arranging icons in the user interface  300  at this time. Specifically, the user interface  300  displays icons representing the following functions as the list: “Copy”, “Fax/Internet Fax”, “Scan and Mail”, “Scan and Send URL”, “Simple Copy Setting”, “Simple Fax Setting”, “Scan to PC”, “Eco Copy”, “Scan to Box”, and “Scan to USB”. These functions relate to scanning, printing, and facsimile and different from the functions represented by the list of the functions displayed in the standard state of  FIG. 4 . 
       FIG. 8  illustrates an example of the list of the functions displayed in the user interface  300  when the position watched by the user is the manual feed tray  67  (see  FIG. 3 ). 
     The list of the functions relating to manual feed copying is displayed by arranging icons in the user interface  300  at this time. Specifically, the user interface  300  displays icons representing the following sizes as the list: “Automatic Size”, “Standard Size”, and “Non-standard Size”. In this case, instead of the functions relating to the manual feed copying, the way to use the manual feed tray  67  (for example, an instruction on the orientation of the sheet P) may be displayed. 
     When the position watched by the user is one of the output trays, that is, the first placement tray  71  or the second placement tray  72  (see  FIG. 3 ), it is thought that the user only wishes to collect the sheet P having undergone printing. Accordingly, it is sufficient that the list of the functions to be displayed in the user interface  300  be the list displayed in the standard state of  FIG. 4 . 
     The examples of  FIGS. 7 and 8  are for the cases where the function list determination unit  403  determines the functions relating to the position in the line of sight of the user and the display control unit  404  displays the list of these functions as the icons in the user interface  300 . 
     In contrast, when a process obtained by the process information obtaining unit  402  is a print job from the user, the functions relating to the print function are displayed regardless of what position is watched by the user. In this case, the function list determination unit  403  determines the functions relating to the process performed in advance by the user and the display control unit  404  displays these functions in the user interface  300 . 
     Second Example 
     Next, a second example of the operations of the control device  400  is described. 
       FIG. 9  is a flowchart illustrating the second example of the operations of the control device  400 . 
     Processing from step S 201  to step S 205  of  FIG. 9  is the same as or similar to the processing from step S 101  to step S 105  of  FIG. 6 . Thus, description of the processing from step S 201  to step S 205  is omitted. 
     After step S 205 , the line-of-sight determination unit  401  further obtains information about the line of sight of the user detected by the detection device  500  (step S 206 ). The line-of-sight determination unit  401  determines the position watched by the user (step S 207 ). 
     Next, the line-of-sight determination unit  401  determines whether or not the position watched by the user is the user interface  300  (step S 208 ). 
     When the position watched by the user is not the user interface  300  (“NO” in step S 208 ), the processing returns to step S 204 . 
     In contrast, when the position watched by the user is the user interface  300  (“YES” in step S 208 ), the function list determination unit  403  determines functions in accordance with a function presently displayed at the position in the line of sight of the user toward the user interface  300  (step S 209 ). 
     The display control unit  404  reselects the functions and displays the reselected functions in the user interface  300  (step S 210 ). 
       FIG. 10  is an example of a display image displayed in the user interface  300  according to the second example. 
       FIG. 10  illustrates an example in which the position watched by the user is the user interface  300 , and more specifically, the icon of, for example, “Scan and Mail” at the position in step S 208  described above. 
     At this time, as functions in accordance with the function of “Scan and Mail”, the icons of “Scan and Send URL”, “Scan to PC”, “Scan to USB”, Scan to Box”, and “Scan Settings” are displayed in the user interface  300  in addition to “Scan and Mail”. 
     At this time, a high priority may be assigned to displaying of functions not included in the list of the functions displayed before the reselection. For example, a high priority is assigned to display of functions that are not in the list for the functions displayed in the standard state as illustrated in  FIG. 4  and that are found only by navigating down the hierarchy. 
     According to the above-described exemplary embodiment, changing the list of the functions displayed in the user interface  300  is controlled in accordance with the line of sight of the user. Thus, the user may easily find a target function from the list. 
     Although the information processing apparatus is exemplified by the image forming apparatus  1  in the above-described examples, this is not limiting. That is, the present exemplary embodiment is applicable to any of apparatuses as long as the apparatuses display a list of plural functions in the form of a display image. For example, the present exemplary embodiment is also applicable to devices such as mobile phones, smart phones, and tablets in which icons of application programs are displayed and arranged as the list of functions. 
     Furthermore, in the above-described examples, the information processing system S is configured by providing the detection device  500  and the image forming apparatus  1  as the information processing apparatus as separate units. However, for example, the detection device  500  may be disposed in the image forming apparatus  1  so as to be integrated with the image forming apparatus  1 . 
     The foregoing description of the exemplary embodiment of the present invention has been provided for the purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations will be apparent to practitioners skilled in the art. The embodiment was chosen and described in order to best explain the principles of the invention and its practical applications, thereby enabling others skilled in the art to understand the invention for various embodiments and with the various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the following claims and their equivalents.