Abstract: A predetermined action is performed between a player object and another object positioned in a first determination range when a player designates said another object by controlling a pointing device. On the other hand, when the player performs an operation so as to designate said another object positioned outside the first determination range, a position of the player object is updated based on the designated position.

Abstract: A multiple video stream capture and encoding apparatus produces compressed data that represents multiple video streams capturing a common scene. Images from multiple video streams are analyzed to identify image color segments that are encoded into a composite graph data structure. Corresponding image segments across the multiple video streams are also identified and represented by one node in the composite graph data structure. The composite graph data structure also includes links between pairs of nodes that describe the relationship between the image segments associated with those nodes. The composite graph data structure is updated to represent changes to the image segments in the multiple video streams over time. The composite graph data structure is used to create compressed encoded data for storage and/or transmission.

Abstract: The present invention describes a self-contained omni-directional imaging device. The device is designed to contain within it all mechanic, electronic, optic and electro-optic components required for its operation, namely: omni-directional optics, image capture device, power source, illumination sources, transmitters, receivers and additional optional elements for enhanced capabilities. A preferred embodiment of the invention describes such a device housed inside a durable spherical structure, designed for deployment to potentially hazardous environments, enabling omni-directional view to those environments without endangering the viewer. The device is capable of acquiring and transmitting still or video images and audio streams to a remote, control and display unit located near the operator.

Abstract: A picture photographed by a camera portion is sent to a video capturing portion of a computer. The picture is displayed in an operation area of a monitor. A panorama picture of which pictures in part or all moving range of a pan tiler are combined is displayed in a panorama operation area. A pan tilter portion sends positional information of pan and tilt to the computer through a mode controller. With a mouse, the operation area and the panorama operation area are operated so as to select an object. The computer obtains data for driving the pan tilter. Thus, the selected object is displayed at the center of the operation area.

Abstract: A system and method for an omnidirectional camera for use in recording events around a police vehicle is disclosed. The system and method include an omnidirectional camera and a digital processor for processing the omnidirectional images captured by the omnidirectional camera. The digital processor may be operable to locate one or more regions of interests disposed within the omnidirectional images. A recordable medium is also disclosed for storing at least some of the captured images.

Abstract: A panoramic camera design that is lower cost, robust, stable and more user friendly than prior art designs. The camera design makes use of a unified molded structure of optical material to house a mirror, aligned sensor, and lens assembly. The unified molded structure of the camera keeps the sensed optical path enclosed to minimize dust and user's fingers and maintain optical alignment.

Abstract: Systems and methods for maintaining orientation of a non-cylindrical panorama is described wherein an initial magnetometer reading is obtained for a panoramic camera. If the panoramic camera is rotated from an initial position, a new magnetometer reading is obtained and a magnitude of rotation is determined. The magnitude of rotation is factored into an image stitching and warping process to create a panoramic image that maintains the initial orientation.

Abstract: An apparatus configured for use in a camera identifies appropriate times to capture optical images with the camera. The apparatus includes a motion detector for generating movement data based on movement of the camera. A controller coupled to the movement detector identifies appropriate times to capture optical images based on the movement data.

Abstract: A coverage area picture imaging a maximum area is displayed on a coverage area picture display. A camera is moved within a predetermined range and a plurality of frames obtained as a result form a picture. The pixels of the picture is decimated in vertical and horizontal directions and form a thumbnail as the coverage area picture. The coverage area picture display presents a display indicating a direction in which the camera is currently directed for picture photographing. In accordance with the display, a photographing direction is controlled. A plurality of frames are photographed with respect to a designated position, then stored, and displayed. A whole picture display presents a whole panorama picture. A selective picture display presents a frame at the position designated within the whole panorama picture as a selected picture.

Abstract: To provide a technology for easily distributing an image in a requested photograph direction. Photograph images, which are photographed by turning a photographing apparatus and continuously photographing the periphery of the photographing apparatus, are stored in a storing region. Any direction in a photograph range of the photographing apparatus is specified and a distribution request of an image photographed in the specified direction is received. A reading start position on one image is determined from the continuous photograph images in accordance with the specified direction of the distribution request. A part of the photograph image is read out from the start position as a distribution image. The distribution images are read out from the positions moved correspondingly to the turns from the start position on the image following the photograph image. The distribution images are distributed to request destinations of the distribution requests.

Abstract: Provided is a specific configuration of an omnidirectional photographing device which includes one camera module equipped with a lens for directly taking a 360-degree annular image. More specifically, there is provided an omnidirectional photographing device configured to facilitate carrying. The omnidirectional photographing device includes: one camera module equipped with a lens capable of directly taking a 360-degree annular image; a main body for holding the camera module; and a display unit fixed to the main body, for displaying an image photographed by the camera module.

Abstract: In one embodiment, a longitudinal camera array is rotated through a capture cylinder, with each camera in the array capturing multiple images as the array rotates. These images can be looking outward along the radials of the cylinder, or alternatively looking tangential to the cylinder. The longitudinal camera array allows the surrounding scene to be captured from multiple different planes that are substantially parallel to the ends of the capture cylinder, allowing for more accurate subsequent rendering of the scene. A view of the scene can be subsequently rendered by determining a location and direction of view of an observer, and then selecting one or more of the multiple lateral and longitudinally adjacent capture images, as well as one or more pixels within that capture image(s), to use to determine a display value for the pixel.

Abstract: A photographic device equipped with a camera capable of photographing a 360-degree all-round image at a time includes a memory for recording the all-round image photographed by the camera, a control unit for specifying a predetermined range within the all-round image, extracting an image of the predetermined range from the memory to display the image, and for extracting and displaying the image within the all-round image recorded in the memory by changing a position of the predetermined range, thereby displaying the image as if the predetermined range moves in a circumferential direction, and a display unit for displaying at least the image of the predetermined range.

Abstract: In one embodiment, a longitudinal camera array is rotated through a capture cylinder, with each camera in the array capturing multiple images as the array rotates. These images can be looking outward along the radials of the cylinder, or alternatively looking tangential to the cylinder. The longitudinal camera array allows the surrounding scene to be captured from multiple different planes that are substantially parallel to the ends of the capture cylinder, allowing for more accurate subsequent rendering of the scene. A view of the scene can be subsequently rendered by determining a location and direction of view of an observer, and then selecting one or more of the multiple lateral and longitudinally adjacent capture images, as well as one or more pixels within that capture image(s), to use to determine a display value for the pixel.

Abstract: A system and method for automatically selecting an object from a field of view of a handheld image capture device. The system includes sensors configured to sense features of one or more objects in the field of view and a decision unit configured to automatically select one or more objects from the field of view based on the sensed features using a decision algorithm that is based on a decision structure, wherein the decision structure receives and prioritizes inputs from the sensors. The system may also optionally include an object movement detecting module configured to detect movement of objects, and a manual selection unit configured to provide user priorities; if included, the information from these elements may also be used by the decision unit to automatically select the object or objects.

Abstract: To provide a processing apparatus for performing synthesis of video data to which video data of optically overlapped (duplicated overlap) video images are imparted. An image processor includes gamma removal units 810, 811, and 812 which remove gamma processing performed on video data to which video data of optically overlapped (duplicated overlap) video images are imparted, a video synthesis unit 825 which synthesizes video data adjacent to each other in the video data from which the gamma processing is removed, and a gamma addition unit 826 which re-performs gamma processing on the synthesized video data.

Abstract: A method of remotely viewing a video from a selected viewpoint selected by the viewer from a continuous segment, including, recording a video of a subject using at least one depth video camera that records a video comprising a sequence of picture frames and additionally records a depth value for each pixel of the picture frames, recording a video of the subject using at least one standard video camera positioned to record a video at a viewpoint that differs from the viewpoint of the depth video camera, rendering a depth hull that defines a three dimensional outline of the subject being recorded using the depth values recorded by the depth video cameras, providing the recorded video from one or more cameras positioned on either side of the selected viewpoint, incorporating the recorded video from the one or more cameras onto the rendered depth hull to render a viewable video from the selected viewpoint; and displaying the rendered viewable video to the viewer.

Abstract: The present invention provides a method of generating a virtual viewpoint video image when the virtual viewpoint position is not located on a plane where a camera is disposed. In an environment in which a plurality of cameras having a horizontal optical axis are disposed in a real zone (for example, on the circumference) which surrounds an object, a video image of an arbitrary viewpoint on the circumference is generated. Further, by synthesizing video images photographed by a camera, a free viewpoint video image is generated from a virtual viewpoint (viewpoint from a high or low position) where no camera is placed. According to a method of achieving this, a travel distance of a display position is calculated by the local region synthesizing portion and this travel distance is reflected to the free viewpoint video image of a local region.

Abstract: A method of and apparatus for efficient encoding and decoding by reconstructing an icosahedron panorama image are provided. The method includes: dividing patches forming a top part and a bottom part, respectively, in development figure of an icosahedron panorama image, from patches forming a middle part; reconstructing the divided patches on a 2-dimensional plane so that patches having a high correlation are placed adjacent to each other; and encoding the reconstructed patches.

Abstract: A 360°-image is formed on the object-side surface (doughnut-shaped) 15 of an optical fiber array 13. The image is applied from the element-side surface 16 of the array, which is substantially rectangular, to an imaging element 11 that is rectangular. The image that has been photographed is converted in accordance with the image signals generated at the object-side surface. Hence, the entire surface of the imaging element 11 can serve as effective photographing region. In addition, the image of the camera, which is formed on the center part of the object-side surface 15, is not transmitted to the imaging element 11.

Abstract: The present disclosure is directed to a virtual pan/tilt camera system and method for use with vehicles, and particularly ground vehicles (MGVs). The disclosure utilizes autonomous navigation systems (ANSs) used with pan/tilt cameras, but eliminates the pan/tilt cameras substituting a plurality of video cameras. Each video camera is mounted in a fixed orientation on the vehicle and covers a selected angular range of lateral view. Commands from the ANS are mapped to selected addresses where the video data from the video cameras are stored, and appropriately transformed data from the selected addresses are input to the ANS. Computers and software in the MGV receive video data from the cameras and stitch the imagery together into a single panoramic view. Video data from cameras with overlapping fields of view are used to simulate the view of stereo cameras.

Abstract: Aspects of the invention can provide a sight line inducing information display device, a sight line inducing information display program and a sight line inducing information display method able to precisely estimate the flowing direction of a sight line of an observer from the arrangement of partial areas itself. After image information of a visual document, etc. is divided into partial areas and is recognized, an initial noticing probability every partial area, its sight line inducing direction and its probability can be respectively calculated. The initial noticing probability, its sight line inducing direction and the probability can be respectively displayed. On the basis of these displays, the flowing path of the sight line of the user observing this visual document can be estimated. Thus, the flowing direction of the sight line of the observer can be precisely estimated from the arrangement of the partial areas itself.

Abstract: The digital camera includes a photographing unit which picks-up image data, a storage control unit which stores the image data, a reconstruction control unit which reconstructs the stored image data, an image data processing unit which combines the picked-up image data and the reconstructed image data, and stores the produced image data into the recording medium, a display control unit makes a display unit simultaneously display the picked-up image data for monitoring and the reconstructed image data, or makes the display unit display the image data generated by the image data processing unit.

Abstract: A panoramic image management system and method is disclosed. The system provides for improved calibration of a 360 degree panoramic camera, as well as improved means for manipulating the images, and correlating images from conventional video cameras with the images from the 360 degree panoramic camera. The system also provides means for archiving and retrieving stored images. The present invention contributes to an improved video surveillance system.

Abstract: A system and method for providing privacy regions in a picture or video. In one example embodiment, a camera is provided which has a lens system and detector, image processing circuitry, compression and formatting circuitry, and control circuitry. Images or video taken from the camera are preferably corrected for distortion (such as that introduced by an anamorphic lens system) and sent to an operator's workstation, where a privacy region is defined. The privacy region is merged with the rest of the image, whether constant or dynamic, and displayed. Other processing, such as object tracking and alarms, can also be implemented at varying points in the process.

Abstract: A system and method for designing and using freeform reflectors to collect images of a wide angle field-of-view scene is provided. A freeform reflector may enable a wide angle field-of-view to be collected in an unwarpped and unwrapped manner such that computer processing may be eliminated. Furthermore, the use of a freeform reflector allows for larger areas of an image sensor chip to be used, thereby providing higher resolution images. Because freeform reflectors may be configured to map a scene onto the image sensor chip in a scalar and mathematically correct manner, output images may be directly displayed from the image sensor chip. Wide angle field-of-view imaging systems, such as surveillance, alarm, and projector system, may utilize freeform reflectors as provided herein.

Abstract: A system and process for attaching tags to panoramic video. Tags provide information when viewing panoramic images, serve as references to specific actions and serve as reference for outside systems into a panoramic image database. Objects in a video can be tagged. It defines tags through 4-D time-space curves, which specify the 3-D location of a tagged object over time. It provides a user-friendly mechanism for defining said curves in panoramic video, which rely on curve fitting techniques to minimize the number of images to be labeled. It provides a mechanism for annotating tags with further information. When displaying tagged panoramic video, tags are graphically superimposed on the panoramic video feed using projective projection techniques. From this visualization, a user can then select a given tag and invoke an associated action. Additionally a mechanism whereby tags and associated user-provided information are used as index into panoramic image databases is provided.

Abstract: A system and process of morphing location-referenced panoramic images into views at nearby locations. When using panoramic images in an interactive tour, a user might desire to see the environment from viewpoints for which no panoramic images are available. This invention makes this possible. It enables a user to experience views from arbitrary locations in the environment, so as long as one or more panoramic images are available at nearby locations. In particular, this invention makes it possible to combine two non-overlapping geo-referenced panoramic video streams into a new video stream which seamlessly transitions between these streams. When used in a client-server architecture, this invention also makes it possible for the server to transmit a sparse sequence of panoramic images, and provide the user with a dense panoramic video stream, by synthesizing the missing panoramic images. Said system and process is also applicable to incomplete panoramic images, photographs, and video.

Abstract: A panorama photography method and apparatus is provided to inform a use of an optimum photographing position for the next photograph when capturing in succession several adjacent photographs to obtain a combined panorama photograph. In the method, after a first image is captured, a guide image is generated from a predefined section of the first image, and a first edge is detected in the guide image. A preview image is acquired for a second image to be captured, and a second edge is detected in the preview image. The second edge is obtained from a predefined part of the preview image that coincides with the guide image. Based on comparison between the first and second edges, notification data are generated and outputted together with a synthetic image of the guide image and the preview image.

Abstract: The invention relates to building spherical panoramas for image-based virtual reality systems. The image-based spherical panoramas can be navigated in any desired view direction (360-degrees) by suitable three-dimensional image browsers or viewers. The method and system also includes computing the number of photographs required to be taken and the azimuth angle of the center point of each photograph for building a spherical environment map representative of the spherical panorama. The method and system also includes an algorithm for computing the accurate azimuth angles of these taken photographs and seaming them together to build the spherical environment map.

Abstract: A method and apparatus is disclosed for providing special effects for wide-angle video images. The special effects include replacing a selected portion of a wide-angle video image with a predetermined image or an associated portion of a video image captured in a subsequent frame. Other special effects include image intensity scaling for wide-angle video images.

Abstract: A composite camera system includes a control section for performing positional control and magnification ratio control of at least one zoom camera ratio for omnidirectional image data centered on a prescribed portion thereof, the omnidirectional image data being obtained by an omnidirectional camera capable of taking an omnidirectional image over a viewing angle of a maximum of 360 degrees; and a display section for displaying an omnidirectional image taken by the omnidirectional camera and a zoom image taken by the zoom camera.

Abstract: A surround surveillance system mounted on a mobile body for surveying surroundings around the mobile body includes an omniazimuth visual system, the omniazimuth visual system includes at least one omniazimuth visual sensor including an optical system capable of obtaining an image with an omniazimuth view field area therearound and capable of central projection transformation of the image into an optical image, and an imaging section including an imaging lens for converting the optical image obtained by the optical system into image data, an image processor for transforming the image data into at least one of panoramic image data and perspective image data, a display section for displaying one of a panoramic image corresponding to the panoramic image data and a perspective image corresponding to the perspective image data and a display control section for controlling the display section.

Abstract: The systems and methods described herein include, among other things, a technique for calibrating the outputs of multiple sensors, such as CCD devices, that have overlapping fields of view and mapping the pixels of those outputs to the pixels of a display screen by means of a lookup table so that a user can see a selected field of view within the larger fields of view that are seen by the sensors.

Abstract: A background lighting module illuminates an object from behind by visible light with respect to a photographing module to identify an area including the boundary between the object and the background portion in an image to be photographed by the photographing module. A controller controls a photographing operation including the exposure of the photographing module and the lighting intensity of the background lighting module. An image processing module processes the images photographed by the photographing module. The controller sets the exposure and lighting intensity to specific conditions so as to photograph a processing image where the background portion on the periphery of the object has a higher luminance than that of the silhouette portion of the object. The image processing module extracts the shape of the object by using the luminance difference between the silhouette area of the object and the background area on the periphery of the object.

Abstract: A remote monitoring system which enables the owner and the custodian of a facility to recognize an intrusion from the outside and the owner himself to confirm the details of the intrusion, and which comprises a monitor device (11) for detecting abnormalities of facility and photographing them, and a control server (24) for receiving information from the monitor device (11) to transmit it to mobile terminals (28). The control server 24 (24) comprises an image DB (48) for storing received images in conjunction with the monitor device, a customer/facility specifying unit (44) in the monitor device for specifying mobile terminals carried by customers, and a message preparing unit for preparing messages to be notified to mobile terminals, thereby transmitting messages and contents to mobile terminal (28).

Abstract: A wide-angle optical system (2, 40) having an objective (4, 42) and a mirror system, including a curved mirror (6, 46) for projecting a wide-angle image through the objective (4, 42) onto a detector (10, 44). At least one mirror (8, 46) of the mirror system is arranged movably relative to the objective (4, 42). It is possible to achieve a zoom function, a large elevation range and a selection of an enlarged section from the wide-angle image.

Abstract: An image reproduction apparatus includes display-image discrimination unit for discriminating a display mode (normal display, at-a-glance display, panoramic display, etc.) in which selected image data is to be displayed, display-mode setting unit for setting the display mode, which is discriminated by the display-image discrimination unit, to the image data, and display unit for displaying the image data in the display mode set by the display-mode setting unit.

Abstract: A system and method for exposing different parts of a single field of view for various and differing lengths of time while capturing an image is provided. For astrophotography, unwanted light pollution or over-saturation bleeding from nearby or obtrusive stars may be greatly reduced or eliminated while still capturing the image of the nearby brighter star in the same field of view. Also, a system and method for real-time contrast control while capturing an image to optimize signal-to-noise ratio for various parts of the captured image, is provided. An embodiment of the present invention provides such techniques by using spatial light modulator devices, such as a digital micro-mirror device, to controllably mask different portions of light from an image that expose film or a charge-coupled device. A system and method for a way to use a spatial light modulator device as an active and controllable mask for photolithography, is provided.

Abstract: The image input apparatus comprises the image pickup unit which optically scans a subject and successively acquires partial images of the subject. The relative change detection unit detects an amount of relative change in position or speed of the image pickup unit between a time when a previous partial image was taken and a time when a current partial image is being taken. The an overlapping amount calculating unit calculates an amount of overlap between the previous partial image and the current partial image based upon the amount of relative change in position or speed detected by the relative change detection unit. The image recording determination unit determines whether or not the current partial image is to be recorded based upon the amount of overlap calculated by the overlapping amount calculating unit.

Abstract: This invention has as its object to provide a convenient image processing apparatus which does not limit image sensing purposes. To achieve this object, an image processing apparatus has a recording medium for recording and playing back an image sensed by an image sensing unit, and an image display unit for playing back and displaying at least an image sensed before the current image. The image display unit has a display layout mode for displaying the current image sensing signal and at least the image sensed before the current image sensing signal with their partial boundary regions overlapping each other.

Abstract: Methods and apparatus for shifting perspective in a composite image derived from a plurality of images including a first image as a center of projection, and a modified version of a second image that is corrected for perspective distortion relative to the first image. A user input specifies a change in perspective to make the second image the center of projection. In response, a transformation is determined for mapping reference points in the modified version of the second image to reference points in the original, uncorrected second image. The transformation is applied to each of the plurality of images in the composite image, and the transformed images are merged to form a second composite image that has the second image as its center of projection. The methods and apparatus can be implemented as an interactive tool capable of changing perspective based on a single user input.

Abstract: A method and a system of generating an image sequence of an object within a scene. According to one embodiment, the method includes capturing an image (images I1-N) of the object with a plurality of camera systems, wherein the camera systems are positioned around the scene. Next, the method includes 2D projective transforming certain of the images (I2-N) such that a point of interest in each of the images is at a same position as a point of interest in a first image (I1) from one of the camera systems. The method further includes outputting the transformed images (I2?-N?) and the first image (I1) in a sequence corresponding to a positioning of the corresponding camera systems around the scene.

Abstract: The purpose of obtaining a high resolution image with fewer number of image sensings in an image input device which allocates a planar object such as a document or the like into a plurality of areas for image sensing, and combines the obtained image data for output to a printer or display device or the like. An image reading device using an area sensor as an image sensing element 30 which is stationary in an image sensing unit 14 facing the center of a document 1 on a table 11, and a taking lens 31 moves parallel to the document 1 and the image sensing element 30 to read the images of allocated sections A˜I of the document 1.

Abstract: In one embodiment, a longitudinal camera array is rotated through a capture cylinder, with each camera in the array capturing multiple images as the array rotates. These images can be looking outward along the radials of the cylinder, or alternatively looking tangential to the cylinder. The longitudinal camera array allows the surrounding scene to be captured from multiple different planes that are substantially parallel to the ends of the capture cylinder, allowing for more accurate subsequent rendering of the scene. A view of the scene can be subsequently rendered by determining a location and direction of view of an observer, and then selecting one or more of the multiple lateral and longitudinally adjacent capture images, as well as one or more pixels within that capture image(s), to use to determine a display value for the pixel.

Abstract: An image synthesization method, whereby a plurality of images, each of which has a partially overlapping image area, are synthesized to create a single synthetic image, comprises a determination step of inputting a plurality of image data sets that correspond to the plurality of images that are input, and of determining whether or not an image in the partially overlapping image area of each of images that are indicated by the plurality of image data sets includes mainly characters an image processing step of performing, for the plurality of image data sets that are input, image processing in consonance with a result of a determination performed at the determination step and an image synthesization step of synthesizing images that are indicated by the resultant plurality of image data, for which the image processing has been performed at the image processing step. With this arrangement, a plurality of images can be easily and effectively synthesized.

Abstract: A multi-camera capture system is aligned using a capture system so that a subject remains in the field of view of a camera. In one embodiment of the present invention, the multi-camera system capture system is mounted on a camera platform. The camera platform is connected to a subject platform and the subject platform is constrained to remain in the field of view of a first camera of the multi-camera capture system. In another embodiment of the present invention, the multi-camera capture system is mounted on a camera platform that moves along a circular track system. The camera platform is configurable to align a first camera to capture a subject within the circular track system as the camera platform moves along the circular track system.

Abstract: A live camera whose image pickup direction is remote-controlled is utilized, and a plurality of frames picked up in different pickup directions are composed so as to generate a composite image, and this is stored in a memory. Upon request from the user for altering the pickup direction, in the composite image within the memory, an extraction area is shifted in the horizontal direction and vertical direction in response to the request for alteration in a manner so as to correspond to a pickup image in the live camera, and the image within the extracted area is transmitted to the user. This arrangement eliminates the necessity of altering the pickup direction of the live camera mechanically, and independent of the mechanical alteration, only the electrical image processing of the composite image is carried out, with the result that the user is allowed to feel as if he or she were actually operating the live camera.

Abstract: Apparatus, methods and computer program products are disclosed that track movement or a moving object through a warped video image. The warped video image can result from a video camera attached to a warping lens such as a wide-angle lens or panoramic lens. Some embodiments allow a user to select the portion of the image that interests the user for tracking. Other embodiments automatically select and track movement through the warped video image without input from a user. Still other embodiments track when movement comes into proximity with an area-of-interest and will raise an alarm that can be used to start recording of the warped video image or to trigger other alarm responses. Yet other embodiments change the bandwidth allocated to portions of the warped video image sent over a network responsive to the tracked movement so that the movement stays in a quality view.

Abstract: In an audio/video/computer graphics data synchronous reproducing/synthesizing system, a demultiplexer separates a bit stream in which an audio signal, a video signal, and computer graphics data are compressed and multiplexed, into compressed audio and video signal streams, audio and video signal time reference values, and a compressed computer graphics data stream. An audio PLL generates a first decoding clock. An audio decoder decodes the audio signal. An audio memory stores the decoded audio signal. A modulator modulates the audio signal in accordance with sound source control information. A video PLL generates a second decoding clock. A video decoder decodes the video signal. A video memory stores the decoded video signal. A CG decoder decodes the computer graphics data and event time management information. A CG memory stores the decoded computer graphics data. An event generator generates an event driving instruction. A detector detects viewpoint movement of an observer.