JP5701967B2 - Image display device and image display method - Google Patents

Description

  The present invention relates to an apparatus and a method for displaying an image.

  Digital still cameras and digital video cameras have become widespread, and there are more opportunities to save and view captured still images and movies on a computer, display them on the screen of game consoles and television (TV) systems. Yes. In addition, it is also popular to upload a captured video to an Internet posting site and share the video with other users.

  Some digital cameras can take panoramic images, and it has become possible to easily take panoramic images with a wide viewing angle. A software tool that generates a panoramic image by combining a plurality of images taken by a digital camera while changing the shooting direction is also often used.

  There is also a site called 360 cities (http; // www.360cities.net) that accepts postings of panoramic images taken by users and publishes them on the Internet, and can browse panoramic images posted by users all over the world. .

  If a large number of panoramic images with different shooting locations are posted on the site, multiple panoramic images with different shooting locations will simply be on the site unless you devise arrangements such as organizing panoramic images at the shooting location. Use of panoramic images is not promoted.

  The above-mentioned site called 360 cities uses an interface that allows a user to select and view a panoramic image shot at a point while searching for a point on the map by pasting the posted panoramic image on a flat map. .

  However, since panoramic images at different shooting locations are not directly related to each other, when viewing of the panoramic image taken at a certain point is finished, the user returns to the map display and selects a point on another map. You have to search and select a panoramic image taken at a new location.

  The present invention has been made in view of these problems, and an object of the present invention is to provide a technique that allows panoramic images with different shooting locations to be associated with each other and browsed efficiently.

In order to solve the above problem, an image display device according to an aspect of the present invention acquires a storage unit that stores an image in which information about a shooting location and information about a shooting direction are associated, and acquires an image to be displayed from the storage unit An acquisition unit that performs display, a display control unit that displays an image to be displayed on a screen, and an interface unit that receives a user instruction for the displayed image. When the interface unit receives an instruction to switch the displayed image to another image, the interface unit sets another image as a new display target image instead of the image that has been displayed so far, and is displayed so far. The region of the other image to be displayed first on the screen is set according to the shooting location of the image and the shooting location of the other image.
Another aspect of the present invention is an image display method. In this method, a processor reads out an image to be displayed from a storage device that holds an image in which information related to a shooting location and information related to a shooting direction are associated, and displays the image to be displayed on a screen. Receiving a user instruction for the image. In the step of accepting the user's instruction, when an instruction to switch the displayed image to another image is received, instead of the image displayed so far, another image is set as a new display target image, The region of the other image to be displayed first on the screen is set according to the shooting location of the image displayed so far and the shooting location of the other image.

Yet another embodiment of the present invention is a panoramic image display device. The apparatus includes a storage unit that holds a panoramic image in which information about a shooting location and information about a shooting direction are associated, an acquisition unit that acquires a panoramic image to be displayed from the storage unit, and shooting of the panoramic image to be displayed When a shooting location of another panoramic image exists in the direction, a marker setting unit that associates a marker indicating that another panoramic image exists in the shooting direction with the panoramic image to be displayed, and a marker of the other panoramic image A mapping processing unit that maps the associated panorama image to be displayed as a texture to a three-dimensional panorama space, and a shooting position of the panorama image to be displayed as a viewpoint position in the specified viewing direction. A three-dimensional image generation unit for generating a three-dimensional panoramic image when viewed; and the three-dimensional panorama Comprising a display control unit for displaying an image on a screen, and an interface unit that receives an instruction of a user on the displayed 3-dimensional panoramic images.
Yet another embodiment of the present invention is also a panoramic image display device. The apparatus includes a storage unit that holds a panoramic image in which information about a shooting location and information about a shooting direction are associated, an acquisition unit that acquires a panoramic image to be displayed from the storage unit, and shooting of the panoramic image to be displayed When a shooting location of another panoramic image exists in the direction, a marker setting unit that associates a marker indicating that another panoramic image exists in the shooting direction with the panoramic image to be displayed, and a marker of the other panoramic image And a display control unit that displays the associated panoramic image to be displayed on the screen.

  Yet another embodiment of the present invention is a panoramic image display method. In this method, a processor reads a panoramic image at a certain shooting location as a display target from a storage device in which a plurality of panoramic images associated with information on the shooting location and information on a shooting direction are stored; If there is a shooting location of another panoramic image in the shooting direction, the processor associates a marker indicating that another panoramic image exists in the shooting direction with the panoramic image to be displayed, and then displays the panoramic image to be displayed. Displaying on the screen.

  Yet another embodiment of the present invention is a program. This program has a function of acquiring a panorama image to be displayed from a storage unit that holds a panorama image in which information about a shooting location and information about a shooting direction are associated, and another panorama image in the shooting direction of the panorama image to be displayed. If there is a shooting location, a function for associating a marker indicating that another panoramic image exists in the shooting direction with the panorama image to be displayed, and a texture of the panorama image to be displayed together with a marker for the other panoramic image. A function for mapping to a three-dimensional panoramic space, and a function for generating a three-dimensional panoramic image when the three-dimensional panoramic space is viewed in a specified line-of-sight direction with the shooting location of the panoramic image to be displayed as a viewpoint position; Is realized on a computer.

  It should be noted that any combination of the above-described constituent elements and the expression of the present invention converted between a method, an apparatus, a system, a computer program, a data structure, a recording medium, etc. are also effective as an aspect of the present invention.

  According to the present invention, panoramic images with different shooting locations and shooting times can be browsed efficiently.

1 is a configuration diagram of a panoramic image display device according to an embodiment. It is a block diagram of the controller which is an example of the input device connected to the panorama image display apparatus of FIG. FIGS. 3A to 3D are diagrams for explaining the mechanism and shooting direction of the omnidirectional shooting system used for shooting a panoramic image. 4A illustrates the azimuth angle θ of the camera 200, and FIG. 4B illustrates the elevation angle φ of the camera 200. FIGS. 5A to 5C are diagrams illustrating panoramic images that are shot when the initial position of the camera is in the direction of the azimuth angle θ. FIGS. 6A to 6C are views for explaining panoramic images taken when the elevation angle φ of the camera is 60 °. It is a figure explaining the method of connecting a some image and producing a panoramic image. It is a figure explaining the method of connecting a some image and producing a panoramic image. FIGS. 8A to 8E are diagrams for explaining an alignment method based on color difference correction when a plurality of images are joined together. 9A to 9C are diagrams for explaining correction of lens distortion. It is a figure explaining the panoramic image displayed as a symbol at the shooting location on a two-dimensional map. It is a figure explaining the panoramic image displayed as a symbol in the imaging location on the surface of the earth displayed in three dimensions. It is a figure explaining the panoramic image with which the marker was linked | related. It is a figure which shows typically a mode that the panoramic image with which the marker of FIG. 12 was linked | related was displayed in three dimensions. It is a figure explaining the panoramic image displayed three-dimensionally when a marker is selected. It is a figure explaining the example of a setting of a gaze direction when a viewpoint moves from one imaging point to another imaging point.

  An outline of an embodiment of the present invention will be described. Assume that a plurality of panoramic images photographed at different photographing positions are given. When a panoramic image shot at a certain shooting position is selected as a display target and viewed with a viewer, the presence of a panoramic image shot at another shooting position is displayed with a marker in the panoramic image to be displayed.

  In addition to the latitude / longitude information of the shooting location, the panoramic image includes information related to the shooting direction of the panoramic image. It is assumed that there is a place where another panoramic image is shot in the shooting direction of the panoramic image, for example, in the southwest direction. At that time, a marker indicating that another panoramic image is present at a location where the southwest direction is photographed in the panoramic image to be displayed is displayed. Many such markers are associated with the panoramic image.

  When the user browses the panorama image to be displayed with the viewer, if a marker in the panorama image is selected, another panorama image corresponding to the marker is displayed instead of the panorama image browsed so far. If there is a shooting location for another panorama image in a specific shooting direction of another panorama image, a marker is displayed in the same shooting direction, and you can switch to another panorama image by selecting the marker. it can.

  In this way, the user can select and view the panorama image by selecting the marker displayed in the panorama image, as if warping from one shooting location to another shooting location.

  FIG. 1 is a configuration diagram of a panoramic image display apparatus 100 according to an embodiment. The panoramic image / additional data storage unit 24 holds a panoramic image in which information about the shooting location and information about the shooting direction are associated. Additional data such as information on the shooting location and shooting direction may be added directly to the panoramic image data file, and the additional data may be managed as a separate file from the panoramic image.

  The information regarding the shooting location includes, for example, latitude / longitude information given by GPS (Global Positioning System). The information on the shooting direction includes, for example, information on the azimuth angle of the center point of the panoramic image obtained from the direction sensor, and may include information on the elevation angle and roll angle of the camera at the time of shooting.

  If the azimuth angle of the center point of the panoramic image is given as information on the shooting azimuth, the azimuth of an arbitrary point of the panoramic image can be calculated based on the angle of panning the camera in the left-right direction. Put the coordinate values of the pixels in the true north, true south, true east, and true west directions of the panoramic image calculated based on the azimuth angle and pan angle of the center point of the panoramic image as information on the shooting direction. May be.

  The panorama image acquisition unit 10 acquires a panorama image to be displayed from the panorama image / additional data storage unit 24. The panorama image to be displayed is specified by the user specifying the shooting location on a map or the like, and another panorama image corresponding to the marker is newly displayed by the user specifying the marker in the panorama image. It may be specified as a panoramic image.

  When there is a shooting location of another panoramic image in the shooting direction of the panorama image to be displayed, the marker setting unit 12 associates a marker indicating that another panorama image exists in the shooting direction with the panorama image to be displayed. . Based on the latitude / longitude information of the panoramic image to be displayed and the latitude / longitude information of the other panoramic images stored in the panoramic image / additional data storage unit 24, the marker setting unit 12 It is possible to specify in which direction of the panoramic image to be displayed the shooting location is. The marker functions as a link for associating panoramic images based on the shooting position and shooting direction. The marker may include latitude / longitude information of the shooting location of the linked panoramic image to identify the linked panoramic image, or may include identification information that uniquely identifies the linked panoramic image.

  The marker setting unit 12 changes the display mode of the marker according to the distance from the shooting location of the panoramic image to be displayed to the shooting location of another panoramic image. For example, highlight markers with different size, color, shape, etc. so that the markers at the shooting location at a close distance stand out, highlight the markers at the shooting location far away, or display above the other markers So let the user feel far away.

  The mapping processing unit 14 performs a process of mapping a display target panoramic image associated with another panoramic image marker as a texture in the three-dimensional panoramic space. In the case of an omnidirectional panoramic image, a sphere is assumed as a three-dimensional panoramic space, and the panoramic image is texture-mapped to a spherical surface by spherical mapping. Alternatively, a cube may be assumed as the three-dimensional panorama space, and the panorama image may be texture-mapped on the cube surface by cube mapping. Further, when the panorama image is an image that does not have a component in the tilt direction and spreads only in the pan direction, a cylinder may be assumed as the three-dimensional panorama space, and the panorama image may be texture-mapped on the cylinder surface. The same applies to a case where the panoramic image has no pan direction component and spreads only in the tilt direction.

  The mapping processing unit 14 maps the display target panorama image as a texture in the three-dimensional panorama space, and then maps a marker associated with the panoramic image shooting direction to the three-dimensional panorama space. Thereby, the marker is combined with the panoramic image.

  The mapping processing unit 14 does not necessarily map all markers associated with the panorama image to be displayed. This is because when a large number of markers are combined with a panoramic image, it may be difficult to see. Therefore, when a large number of markers are concentrated and associated in the same shooting direction of the panoramic image to be displayed or in the vicinity thereof, one representative marker in which a plurality of markers are collected is mapped and displayed. When the two are brought close to each other, a plurality of collected markers may be expanded and displayed. Further, the markers may be classified according to themes by information such as keywords given as additional information of the panoramic image, and only the markers of the theme that match the user's preference may be mapped.

  The three-dimensional image generation unit 16 generates a three-dimensional panoramic image when the mapping processing unit 14 views the three-dimensional panoramic space in which the panoramic image is texture-mapped in a specified line-of-sight direction. When the three-dimensional panoramic space is a sphere, the viewpoint is placed at the center of the sphere. When the cube is a cube, the viewpoint is placed at the center inside the cube. In the case of a cylinder, the viewpoint is placed on the center axis of the cylinder. The viewpoint is a place where a panoramic image to be displayed is photographed, and the line-of-sight direction is a direction of looking around from the photographing place, and is specified by an azimuth angle and an elevation angle. The three-dimensional image generation unit 16 generates a three-dimensional image when the three-dimensional panoramic space is viewed in the viewing direction specified by the azimuth angle and the elevation angle.

  The map generation unit 20 refers to the map data held in the map data storage unit 26, sets a symbol indicating the presence of a panoramic image at a position on the earth surface corresponding to the shooting position, and generates a map image of the earth surface To do.

  The display control unit 18 displays the generated three-dimensional panoramic image and map image on the screen of the display device.

  The user interface unit 40 is a graphical user interface that allows the user to operate the graphics displayed on the display screen using an input device. The user interface unit 40 receives a user instruction from an input device such as a game console controller, a mouse, or a keyboard for a map or a three-dimensional panoramic image displayed on the screen. FIG. 2 shows a controller 102 as an example of an input device, and details of the configuration will be described later.

  When the user interface unit 40 receives an instruction to select a symbol of the panoramic image on the displayed map image from the user, the user interface unit 40 acquires the panoramic image so as to acquire the designated panoramic image from the panoramic image / additional data storage unit 24. The unit 10 is instructed.

  For example, the user can input an instruction to change the line-of-sight direction of viewing the three-dimensional panoramic space by operating the analog stick 118 or the direction key group 116 of the controller 102. The line-of-sight direction setting unit 32 of the user interface unit 40 gives the line-of-sight direction indicated by the user to the three-dimensional image generation unit 16. The three-dimensional image generation unit 16 generates an image when the three-dimensional panoramic space is viewed from the designated line-of-sight direction.

  The angle-of-view setting unit 31 sets the angle of view when the user performs a zoom operation on the displayed panoramic image, and the information on the angle of view set in the panoramic image acquisition unit 10 and the three-dimensional image generation unit 16 is set. give. When panoramic images having different angles of view are stored in the panoramic image / additional data storage unit 24, the panoramic image acquisition unit 10 reads a panoramic image having the angle of view closest to the set angle of view, and displays a panoramic image to be displayed. Switch. The three-dimensional image generation unit 16 realizes a zoom-in / zoom-out visual effect by enlarging / reducing the three-dimensional panoramic image according to the set angle of view.

  The panorama image is also provided with information on the shooting altitude, and the panorama image / additional data storage unit 24 may hold panorama images shot at different altitudes at the same shooting position. In that case, for example, the user can input an instruction to change the altitude by operating the L1 / L2 buttons 161 and 162 on the left side of the front surface of the housing of the controller 102. By pressing the L1 button 161, an instruction to raise the altitude can be given, and by pushing the L2 button 162, an instruction to lower the altitude can be given.

  For example, the display control unit 18 may notify the user that there are panoramic images taken at different altitudes at the same shooting location by displaying small arrows at the top and bottom of the screen. Good. If there is an upward arrow at the top of the screen, it indicates that there is an image with a higher shooting altitude than the current level, and if there is an downward arrow at the bottom of the screen, it indicates that there is an image with a lower shooting altitude than the current level.

  When the altitude setting unit 34 of the user interface unit 40 receives an instruction to change the altitude from the user, the altitude setting unit 34 acquires a panoramic image corresponding to the specified altitude from the panoramic image / additional data storage unit 24 with the same latitude and longitude. The panorama image acquisition unit 10 is instructed to do so. When the L1 button 161 is pressed, the panorama image acquisition unit 10 acquires a panorama image having a higher shooting altitude than the currently displayed panorama image, and when the L2 button 162 is pressed, the panorama image acquisition unit 10 acquires the shooting altitude. Get a lower panoramic image.

  When the display control unit 18 switches and displays panoramic images with different shooting altitudes, the display control unit 18 may apply a special effect to the images, for example, in order to give a feeling as if the user is moving up and down with an elevator. For example, when switching to a higher-level panoramic image, the user scrolls down the currently displayed panoramic image so that the higher-level panoramic image descends from the top, so that the user can move up and down. You can feel as if you went to.

  The panorama image is also given information related to the shooting date and time, and the panorama image / additional data storage unit 24 may hold panorama images with different shooting dates and times at the same shooting position. In that case, for example, the user can input an instruction to change the shooting date and time by operating the R1 / R2 buttons 151 and 152 on the right side of the front surface of the housing of the controller 102. An instruction to shift to a later date and time can be given by pressing the R1 button 151, and an instruction to shift to an earlier date and time can be given by pressing the R2 button 152.

  The display control unit 18 may notify the user that there are panoramic images taken at different dates and times for the currently displayed panoramic image, for example, by displaying a clock or calendar icon at the corner of the screen. A clock icon is displayed when there are panoramic images with different time zones such as morning, noon, and night, and a calendar icon is displayed when there are panoramic images with different seasons such as spring, summer, autumn, and winter.

  When receiving an instruction to change the date / time from the user, the date / time setting unit 36 of the user interface unit 40 obtains a panorama image corresponding to the designated date / time from the panorama image / additional data storage unit 24 at the same shooting position. The panorama image acquisition unit 10 is instructed to do so. When the R1 button 151 is pressed, the panorama image acquisition unit 10 acquires a panorama image that is newer than the currently displayed panorama image, and when the R2 button 152 is pressed, the panorama image acquisition unit 10 acquires the shooting date and time. Get older panoramic images.

  Thus, for example, even at the same shooting location, a panoramic image taken in the morning time zone is switched to a panoramic image in the night time zone, or a panoramic image taken in the autumn from the panoramic image taken in the spring It is possible to switch to a panoramic image with a different time zone or season. When switching the panoramic image, the display control unit 18 may apply an effect such as fade-in / fade-out to the image.

  When the user selects a marker associated with the displayed panoramic image, the marker selecting unit 38 of the user interface unit 40 instructs to set a shooting position of another panoramic image corresponding to the selected marker to a new viewpoint position. To the viewpoint position setting unit 30. The viewpoint position setting unit 30 instructs the panorama image acquisition unit 10 to acquire from the panorama image / additional data storage unit 24 a panorama image corresponding to the new viewpoint position, that is, another panorama image specified by the marker. To do. The viewpoint position setting unit 30 notifies the three-dimensional image generation unit 16 of a new viewpoint position.

  Further, the marker selection unit 38 changes the line-of-sight direction to a predetermined direction so that the line-of-sight direction is fixed in a certain direction when switching from the currently displayed panoramic image to another panoramic image specified by the marker. It is also possible to give the line-of-sight direction setting unit 32 an instruction to set to. For example, the marker selection unit 38 instructs the line-of-sight direction setting unit 32 to set the initial line-of-sight direction from the current panoramic image shooting position to the direction of viewing another panoramic image shooting position specified by the marker. Also good. Alternatively, it may be instructed to set the initial line-of-sight direction in a direction to look back on the current panoramic image shooting position from the shooting position of another panoramic image specified by the marker.

  The line-of-sight direction setting unit 32 gives the specified line-of-sight direction to the three-dimensional image generation unit 16. When the panoramic image is switched, the three-dimensional image generation unit 16 generates an image when the three-dimensional panoramic space is viewed from the gaze direction specified by the gaze direction setting unit 32. As a result, the user sets the line-of-sight direction in the direction in which the marker is set, and sets the line-of-sight direction to look at the new panoramic image, or to look back at the shooting location of the panoramic image that was viewed before selecting the marker. New panoramic images.

  FIG. 2 is a configuration diagram of the controller 102 as an example of an input device connected to the panoramic image display apparatus 100 of FIG. The panorama image display device 100 may be a game machine as an example.

  The controller 102 has a plurality of buttons and keys for performing operation input to the panoramic image display apparatus 100. When the user operates a button or key of the controller 102, the operation input is transmitted to the panoramic image display apparatus 100 by wireless or wired.

  A direction key group 116, an analog stick 118, and an operation button group 120 are provided on the housing upper surface 122 of the controller 102. The direction key group 116 includes “up”, “down”, “left”, and “right” direction instruction keys. The operation button group 120 includes a circle button 124, a x button 126, a square button 128, and a Δ button 130.

  The user grips the left grip 134b with the left hand, grips the right grip 134a with the right hand, and operates the direction key group 116, the analog stick 118, and the operation button group 120 on the housing upper surface 122.

  Further, a right operation unit 150 and a left operation unit 160 are provided on the front surface of the housing of the controller 102. The right operation unit 150 includes an R1 button 151 and an R2 button 152, and the left operation unit 160 includes an L1 button 161 and an L2 button 162.

  The user can move the pointer displayed on the screen in the up, down, left, and right directions by operating the direction key group 116. For example, when selecting any of the plurality of markers displayed in the panoramic image, the direction key group 116 can be operated to move between the plurality of markers on the screen. When the pointer is over a desired marker, the user can select the marker by pressing the ○ button 124.

  Different functions may be assigned to the buttons of the operation button group 120 depending on the panoramic image display application program. For example, the Δ button 130 has a function for specifying menu display, the X button 126 has a function for specifying cancellation of a selected item, the ○ button 124 has a function for specifying determination of a selected item, and the □ button. 128 is assigned a function for designating display / non-display of the table of contents.

  The analog stick 118 includes means for outputting an analog value when it is tilted by a user. The controller 102 sends an analog output signal corresponding to the direction and amount when the analog stick 118 is tilted to the panoramic image display device 100. For example, the user can move the viewpoint in a desired direction in the three-dimensional panoramic image displayed on the display by tilting the analog stick 118 in a desired direction.

  On the top surface 122 of the housing, a button 136 with an LED, a select button 140, and a start button 138 are further provided. The button 136 with LED is used as a button for displaying a menu screen on a display, for example. The start button 138 is a button for the user to instruct the start of the panorama image display application, the start of playback of the panorama image, the pause, and the like. The select button 140 is a button for the user to instruct selection of a menu display displayed on the display.

  FIGS. 3A to 3D are views for explaining the mechanism and shooting direction of the omnidirectional shooting system 230 used for shooting a panoramic image.

  As shown in FIG. 3D, in the omnidirectional imaging system 230, the camera 200 is fixed to the operation panel 210, and the pan angle of the camera is changed by rotating the operation panel 210 around the Z axis, so that the X axis The tilt angle of the camera can be changed by rotating around, and the roll angle of the camera can be changed by rotating around the Y axis. Here, the Z axis is a vertical axis (gravity direction axis).

  FIG. 3A is a top view of the camera 200 installed on the operation panel 210. The initial position (Y-axis direction) of the operation panel is a pan angle of 0 °, and −180 ° to + 180 ° around the Z axis. The pan angle can be changed within the range.

  FIG. 3B is a front view of the camera 200 installed on the operation panel 210. When the operation panel 210 is placed horizontally, the roll angle is 0 °, and −180 ° to + 180 ° around the Y axis. The roll angle can be changed within the range.

  FIG. 3C is a side view of the camera 200 installed on the operation panel 210. When the operation panel 210 is placed horizontally, the tilt angle is 0 °, and −90 ° to + 90 ° around the X axis. The tilt angle can be changed within the range.

  In order to give information about the shooting direction to the panoramic image shot by the omnidirectional shooting system 230 of FIG. 3D, it is necessary to record in which direction the camera 200 was directed at the time of shooting. For this purpose, the omnidirectional imaging system 230 includes an azimuth sensor for measuring the azimuth and an acceleration sensor for measuring the tilt angle. Furthermore, a GPS sensor or the like is provided for measuring the shooting position and shooting time.

  4A illustrates the azimuth angle θ of the camera 200, and FIG. 4B illustrates the elevation angle φ of the camera 200. FIG. 4A is a top view of the camera 200. The camera 200 faces a direction 220 that is shifted from true north to east by an azimuth angle θ at the initial shooting position, and this direction corresponds to a pan angle of 0 °. To do. That is, the azimuth angle of the pan angle reference direction 220 is θ. When shooting a panoramic image, the subject is panoramic shot while changing the pan angle in a range of −180 ° to + 180 ° with respect to the reference direction 220 of the azimuth angle θ.

  FIG. 4B is a side view of the camera 200, and the elevation angle φ is defined as positive when the camera 200 is rotated about the X axis, ie, the upward direction with respect to the 0 ° tilt direction, that is, the Y axis direction. It is an angle to do. Usually, since the camera 200 is set to the horizontal position and shot, the elevation angle φ = 0 °. However, in order to take a panoramic image of the whole celestial sphere, it is necessary to tilt the camera and change the elevation angle φ to shoot the subject. There is.

  FIGS. 5A to 5C are diagrams illustrating panoramic images that are shot when the initial position of the camera 200 is in the direction of the azimuth angle θ.

  As shown in the top view of FIG. 5A, the camera 200 faces the direction 220 of the azimuth angle θ at the initial position, and the elevation angle φ = 0 of the camera 200 as shown in the side view of FIG. °. While maintaining the elevation angle φ = 0 °, panoramic images of all directions at the elevation angle φ = 0 ° are taken while changing the pan angle of the camera 200 in the range of −180 ° to + 180 ° with respect to the reference direction 220. FIG. 5C shows a panoramic image 300 shot in this way. The center of the panorama image 300 has a pan angle of 0 °, the left half of the panorama image 300 is an image taken by changing the pan angle from 0 ° to −180 °, and the right half has a pan angle of 0 ° to 180 °. It is an image that was taken by changing up to.

  Since the center position of pan angle 0 ° of panorama image 300 is shifted east from true north by azimuth angle θ, the positions of north (N), south (S), east (E), and west (W) are dotted lines. It becomes the part shown by. As long as the panoramic image 300 has the azimuth angle θ at the center position with a pan angle of 0 ° as information on the shooting direction, the pixel positions of north (N), south (S), east (E), and west (W) are In consideration of the deviation of the azimuth angle θ, it can be obtained by calculation. Alternatively, instead of the azimuth angle θ, the coordinate values of the pixel positions of north (N), south (S), east (E), and west (W) may be already used as information regarding the shooting direction.

  In order to obtain a panoramic image of the whole celestial sphere, it is necessary to shoot by changing the elevation angle of the camera 200. For example, assuming that the angle of view of the camera 200 is 60 °, in principle, the camera 200 is tilted by ± 60 ° up and down, and the same shooting is performed while changing the pan angle in the range of −180 ° to 180 °. The panoramic image of the whole celestial sphere can be obtained.

  FIGS. 6A to 6C are views for explaining panoramic images taken when the elevation angle φ of the camera 200 is 60 °. As shown in the top view of FIG. 6A, the camera 200 faces the direction 220 of the azimuth angle θ at the initial position, and the elevation angle φ = 60 of the camera 200 as shown in the side view of FIG. °. While maintaining the elevation angle φ = 60 °, the pan angle of the camera 200 is changed in the range of −180 ° to + 180 ° with respect to the reference direction 220, and the elevation angle φ = 60 ° as shown in FIG. A panoramic image 302 is taken.

  Similarly, while maintaining the elevation angle of the camera 200 at φ = −60 °, the panoramic image at the elevation angle φ = −60 ° is shot while the pan angle is changed in the range of −180 ° to + 180 °. An omnidirectional panoramic image can be obtained by combining panoramic images with elevation angles φ = 0 °, 60 °, and −60 °. However, in terms of mounting, in order to correct inconsistency caused by lens distortion when images are bonded at the boundary portion of the angle of view, a method of photographing the vicinity of the boundary is often employed.

  The omnidirectional panoramic image obtained in this way is given information on the azimuth angle and the elevation angle, and the azimuth and elevation angle can be specified for any pixel of the panoramic image based on the information. In addition, latitude / longitude information measured by GPS is given to the panoramic image as position information of the shooting location. For example, the additional information to be added to the panoramic image may be recorded in accordance with an image file standard called Exif (Exchangeable Image File Format). The place name of the shooting location can be recorded as a part of the file name, and the shooting date and time, the latitude / longitude of the shooting location, the altitude, the azimuth angle, and the like can be recorded as Exif format data. The elevation angle is not defined in the Exif format, but is recorded as extended data.

  7A and 7B are diagrams illustrating a method of creating a panoramic image by connecting a plurality of images.

  In the example of FIG. 7A, seven images 341 to 347 taken while tilting (or panning) the camera 200 are mapped onto a cylinder, and then joined together to create a cylindrical image 340. When joining the images, overlap the borders of the images.

  As shown in FIG. 7B, by shooting with the camera 200 panned (or tilted), a plurality of cylindrical images shown in FIG. 7A are obtained in the pan (or tilted) direction. By combining these cylindrical images 340a to 340f by overlapping the vicinity of the boundary between the images, an omnidirectional panoramic image 360 is finally obtained.

  FIGS. 8A to 8E are diagrams for explaining an alignment method based on color difference correction when a plurality of images are joined together.

  When a panoramic image is generated by overlapping a plurality of images in the vicinity of the boundary, inconsistency due to lens distortion occurs in the overlap portion. For example, if the two images 350 and 352 shown in FIG. 8A are simply translated and joined together, the images do not overlap well at the overlap portion as shown in FIG. 8B. Therefore, as shown in FIGS. 8C to 8E, by further rotating one of the images 352, an arrangement (alignment) in which the color difference between the pixels of the overlapping portions of the two images 350 and 352 is minimized. Explore. In this example, the color difference of the overlap portion is the smallest in the arrangement of FIG. At the time of joining a plurality of images described with reference to FIGS. 7A and 7B, the images are synthesized by obtaining an optimal alignment by correcting the color difference by translating and rotating the images.

  9A to 9C are diagrams for explaining correction of lens distortion. The captured image generally has barrel distortion as shown in FIG. 9A and pincushion distortion as shown in FIG. 9B. Therefore, when creating a panoramic image, optical distortion is corrected as shown in FIG. Since the marker is associated with the panoramic image whose distortion has been corrected, the direction indicated by the marker and the shooting direction indicated by the position on the panoramic image to which the marker is associated almost exactly match each other. Little affected.

  FIG. 10 is a diagram illustrating a panoramic image displayed as a symbol at a shooting location on a two-dimensional map. When there are panoramic images taken at points A, B, and C in South America, the map generation unit 20 combines the symbols 400a, 400b, and 400c of the panoramic image with the points A, B, and C on the map in South America. A map image is generated. This symbol is a thumbnail image or icon of a panoramic image. The scale of the displayed map can be changed. The user selects a panoramic image taken at a desired point while browsing the map.

  The map generation unit 20 may display the earth three-dimensionally and display a panoramic image as a symbol at points on the surface of the earth. FIG. 11 is a diagram illustrating a panoramic image displayed as a symbol at a shooting location on the surface of the earth displayed in three dimensions. As in FIG. 10, panoramic image symbols 400a, 400b, and 400c are synthesized in three dimensions at points A, B, and C in South America. The user selects a panoramic image taken at a desired point while rotating the earth. When you zoom in by specifying a point on the earth, the map is enlarged. At the time of enlarged display, there is a case where it automatically shifts to a two-dimensional map as shown in FIG.

  FIG. 12 is a diagram illustrating a panoramic image associated with a marker. Here, a panoramic image 300 at the shooting point A in FIG. 10 or FIG. 11 will be described as an example. When viewed from the shooting point A, the shooting point B is in the southeast direction, and the shooting point C is in the southwest direction. The panorama image 300 at the shooting point A is associated with markers 310 and 312 for indicating that there is a panoramic image at the shooting point B in the southeast direction and that there is a panoramic image at the shooting point C in the southwest direction. The marker 310 corresponding to the shooting point B is associated with the pixel position in the southeast direction of the panoramic image 300, and the marker 312 corresponding to the shooting point C is associated with the pixel position in the southwest direction of the panoramic image 300. Since the shooting point B is closer to the shooting point A than the shooting point C, the marker 310 corresponding to the shooting point B is also highlighted and displayed by the marker 312 corresponding to the shooting point C. For example, the marker size is increased or the marker color is increased.

  FIG. 13 is a diagram schematically illustrating a state in which the panoramic image 300 associated with the marker in FIG. 12 is displayed in a three-dimensional manner. The panorama image 300 at the shooting point A is texture-mapped in a three-dimensional panorama space such as a spherical surface or a cylindrical surface, and a three-dimensional image when the three-dimensional panorama space is viewed from the viewpoint 500 in the viewing direction 510 is displayed on the screen. . When the line-of-sight direction 510 is directed in the southeast direction, the marker 310 of the photographing point B associated on the panoramic image 300 is in the eye, and when the line-of-sight direction 510 is directed in the southwest direction, the marker 312 at the photographing point C is in the eye.

  In FIG. 13, it is assumed that the user selects the marker 310 of the shooting point B. At this time, the panoramic image 320 of the shooting point B is displayed instead of the panoramic image 300 of the shooting point A that has been displayed so far.

  FIG. 14 is a diagram for explaining a panoramic image 320 of the shooting point B that is three-dimensionally displayed when the marker 310 of the shooting point B is selected. Similarly, a marker indicating that there is a panoramic image at another shooting point is associated with the panorama image 320 at the shooting point B. Here, a marker 312 at the shooting point C is displayed.

  When the panorama image 300 at the shooting point A is switched to the panoramic image 320 at the shooting point B, the user's line-of-sight direction 510 may be set to the direction from the shooting point A to the shooting point B, that is, the southeast direction. Thereby, the user can have a sense of warping to the shooting point B while looking at the direction from the shooting point A to the shooting point B.

  FIG. 15 is a diagram illustrating another setting example of the line-of-sight direction 510 when the viewpoint 500 moves from the shooting point A to the shooting point B. FIG. In this example, when the panorama image 300 at the shooting point A is switched to the panoramic image 320 at the shooting point B, the user's line-of-sight direction 510 is set to the direction of looking back from the shooting point B to the shooting point A, that is, the northwest direction. Thus, when the viewpoint 500 moves to the shooting point B, the user sees the rear panorama image 322 instead of the front panorama image 320.

  In the rear panorama image 322, a marker 314 corresponding to the shooting point A is associated with a position in the northwest direction, and when the user moves to the shooting point B, the marker 314 at the shooting point A that was immediately before is moved to the front. You will see. When the user warps from the shooting point A to the shooting point B, the user can feel as if looking back at the shooting point A. When the user returns to the shooting point A and wants to view the panorama image 300 at the shooting point A again, the marker 314 of the shooting point A is displayed immediately before the marker 314 of the shooting point A. To switch to the panoramic image 300 at the shooting point A.

  A setting example of another line-of-sight direction 510 will be described. It is assumed that the panoramic image of the moving destination shooting point is not an omnidirectional image, but only a part of the pan angle range is shot. When the destination line-of-sight direction 510 is set to the direction in which the destination is viewed or the direction in which the destination is looked back as described above, there may be no captured image in that direction in the destination panorama image. Will be displayed. In order to avoid a blank screen, the initial line-of-sight direction 510 in the destination panorama image may be set to a direction with a pan angle of 0 ° of the destination panorama image. Alternatively, the line-of-sight direction 510 in the destination panorama image may be determined in advance as a desired direction. The desired direction may be determined by the user, or may be automatically set on the system side, for example, as a viewing direction recommended in the panoramic image.

  As described above, according to the panoramic image display device of the present embodiment, when a plurality of panoramic images having different shooting locations are given, there are shooting locations of other panoramic images in the shooting direction of a certain panoramic image. A panoramic image is associated so that it can be visually confirmed. This makes it possible to switch and display panoramic images as if warping from one shooting location to another.

  The present invention has been described based on the embodiments. The embodiments are exemplifications, and it will be understood by those skilled in the art that various modifications can be made to combinations of the respective constituent elements and processing processes, and such modifications are within the scope of the present invention. .

  The panorama image preview may be displayed on the screen that displays the symbol of the panorama image at the shooting point on the map as shown in FIGS. In the preview, for example, a part of the panoramic image is displayed in the form of a thumbnail image, and the panoramic image can be browsed by gradually changing the pan angle and the tilt angle in the thumbnail image frame. In addition, when the panoramic image preview is displayed in this way, the direction of the pan angle direction on the map may be displayed with an arrow or the like.

  In the above description, the panoramic image associated with the marker is mapped to a three-dimensional panoramic space such as a spherical surface, and the three-dimensional panoramic image when the three-dimensional panoramic space is viewed from the designated viewing direction is displayed on the screen. The panoramic image associated with the marker may be simply two-dimensionally displayed. In this case, the configuration of the mapping processing unit 14 and the three-dimensional image generation unit 16 is unnecessary, and the panoramic image display device 100 can be simplified. Even in this case, when the user selects the marker of the panoramic image displayed in two dimensions, the panoramic image corresponding to the marker is switched and displayed.

  The panoramic image is not limited to the one taken with the omnidirectional photographing system as shown in FIG. 3, but is composed of an image photographed using a fisheye lens or a plurality of images photographed with a normal digital camera while changing the photographing direction. It may be an image.

  In the above description, the marker setting unit 12 maps the panorama image before combining the markers to the three-dimensional panorama space, and then maps the marker to the three-dimensional panorama space so that the marker is superimposed on the three-dimensional panorama image. Displayed. As another method for synthesizing the marker with the panoramic image, the mapping processing unit 14 synthesizes the marker with the panoramic image to be displayed, and then the mapping processing unit 14 textures the panoramic image with the marker synthesized in the three-dimensional panoramic space. You may make it map. In any case, as long as the position where the marker should be displayed is associated with the panorama image to be displayed, it is possible to synthesize the marker with the panorama image to be displayed at any stage. It is also possible to synthesize after appropriately selecting the marker to be synthesized without synthesizing this marker. When a newly captured panorama image is registered in the panorama image / additional data storage unit 24, a marker of the newly registered panorama image may be added to the already displayed panorama image and displayed. .

  When displaying a marker in a panoramic image, even if the shooting point A and the shooting point B have the same latitude and the shooting point B is on the east side of the shooting point A, the shooting point B is in a different country Alternatively, the display mode of the marker at the shooting point B may be changed. For example, when displaying a panoramic image taken in a country different from the shooting country of the displayed panoramic image with a marker, the shape of the marker is represented by the national flag of the country of the shooting point. When the shooting point B is on the back side of the earth when viewed from the shooting point A, the marker of the shooting point B may be displayed at the bottom of the panoramic image of the shooting point A.

  DESCRIPTION OF SYMBOLS 10 Panorama image acquisition part, 12 Marker setting part, 14 Mapping process part, 16 3D image generation part, 18 Display control part, 20 Map generation part, 24 Panorama image and additional data storage part, 26 Map data storage part, 30 viewpoint Position setting unit, 32 gaze direction setting unit, 34 altitude setting unit, 36 date and time setting unit, 38 marker selection unit, 40 user interface unit, 100 panoramic image display device, 200 camera.

Claims (5)

A storage unit for holding an image associated with information about a shooting location and information about a shooting direction;
An acquisition unit that acquires an image to be displayed from the storage unit;
A display control unit for displaying an image to be displayed on the screen;
An interface unit for receiving a user instruction for the displayed image,
When the interface unit receives an instruction to switch the displayed image to another image, the interface unit sets another image as a new display target image instead of the image that has been displayed so far, and is displayed so far. Depending on the shooting location of the image and the shooting location of the other image, the region of the other image to be displayed first on the screen is set ,
When setting the another image as a new display target image, the interface unit sets the shooting location of the new display target image as a new viewpoint position, and starts from the shooting location of the new display target image. The direction of looking back at the shooting location of the image is set to a new line-of-sight direction, and the region of the other image that should be seen when viewed in the new line-of-sight direction from the new viewpoint position should be displayed on the screen first. An image display device, wherein the image display device is set as a region of the other image . A marker setting unit for associating a marker indicating that another image exists in the shooting direction with the image to be displayed in the shooting direction of the image to be displayed, when a shooting location of another image exists in the shooting direction of the display target image;
The display control unit displays a display target image associated with a marker of another image on a screen,
When the interface unit receives an instruction to select a marker in the display target image, the interface unit replaces the image displayed up to now with another image corresponding to the selected marker as a new display target image. The image display device according to claim 1, wherein: A processor reading an image to be displayed from a storage device that holds an image associated with information about a shooting location and information about a shooting direction;
Displaying an image to be displayed on the screen;
Receiving a user instruction for the displayed image,
In the step of accepting the user's instruction, when an instruction to switch the displayed image to another image is received, instead of the image displayed so far, another image is set as a new display target image, According to the shooting location of the image that has been displayed so far and the shooting location of the other image, the region of the other image that should be displayed on the screen first is set ,
The step of receiving an instruction from the user sets the shooting location of the new display target image to a new viewpoint position when setting the other image as a new display target image, and sets the new display target image. The direction of looking back from the shooting location to the shooting location of the previous image is set to a new gaze direction, and the region of the other image that should be seen when viewed from the new viewpoint position to the new gaze direction is first displayed on the screen. An image display method characterized in that it is set as an area of the other image to be displayed. A function of reading an image to be displayed from a storage device that holds an image associated with information on a shooting location and information on a shooting direction;
A function to display an image to be displayed on the screen;
The computer has a function of accepting user instructions for the displayed image, and
The function of accepting the user's instruction, when receiving an instruction to switch the displayed image to another image, sets another image as a new display target image instead of the image displayed so far, According to the shooting location of the image that has been displayed so far and the shooting location of the other image, the region of the other image that should be displayed on the screen first is set ,
The function of accepting an instruction from the user sets a shooting position of a new display target image to a new viewpoint position when setting the other image as a new display target image, and sets the new display target image. The direction of looking back from the shooting location to the shooting location of the previous image is set to a new gaze direction, and the region of the other image that should be seen when viewed from the new viewpoint position to the new gaze direction is first displayed on the screen. A program which is set as an area of the another image to be displayed .   A recording medium storing the program according to claim 4.

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