JP2009217115A - Camera picture simulator program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simulate a virtual image to be imaged by a camera by using data of a two-dimensional top view. <P>SOLUTION: This camera picture simulator program is used to simulate an image to be imaged when the camera is arranged at an optional position in a predetermined area and display a part or the whole of image of the top view in the predetermined area based on the data of the top view in the predetermined area in a display device. A scale of the image of the top view, a position of the camera arranged on the image of the top view, a position indicating height of the camera, an angle for installing the camera horizontally and vertically, and an angle of view are optionally set. Three-dimensional graphics being virtual images to be imaged by the camera are prepared based on the set information and the data of the top view and are displayed in the display device. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a program for simulating how a picture is taken when a camera is installed in a predetermined area.

  Conventionally, as a technique related to the above simulation, there is one disclosed in Patent Document 1. In this technology, the layout diagram of the monitoring target location on the display screen, the installation position of the camera, the center position of the video frame indicating the range of the video obtained by this camera on the layout diagram, and the video frame Is provided as data, and a layout diagram is displayed on the display screen, and the position of the camera and a video frame are displayed on the layout diagram.

JP 2006-148406 A

  The above technology displays a video frame indicating which range on the layout diagram is captured for the camera after it is actually installed, so that the range of the range captured by the camera in the layout drawing is displayed. It shows the positional relationship roughly. This technology is intended to make the operation after the camera is installed efficiently, and cannot be used for knowing in advance what the image will look like. That is, conventionally, before the camera was installed, it was impossible to clearly know how the camera would appear. For this reason, the position, angle, and angle of view of the camera must be changed by trial and error at the time of installation, and in the worst case, it may be found that desired shooting cannot be performed at the installation position. In addition, in the case of a surveillance camera or the like, the installation position is often high, and this installation position adjustment work is accompanied by great difficulty.

  Therefore, an object of the present invention is to provide a camera video simulator program capable of simulating a virtual three-dimensional shot video of a camera using two-dimensional top view data that is relatively easily available as shooting area information. To do. In addition, the present invention relates to the camera indicator arranged on the area image and the photographing object indicator so that the installation angle necessary for automatically photographing the photographing object with a desired size can be reduced. It is an object of the present invention to provide a camera video simulator program capable of simulating a virtual three-dimensional shot video generated by calculation with an angle of view.

  A camera video simulator program according to an aspect of the present invention simulates a captured video when a camera is arranged at an arbitrary position in a predetermined area. A computer executing the camera video simulator program is a top view of the predetermined area. Based on the data, a process of displaying a part or all of the top view image of the predetermined area on the display device is performed. Processing for arbitrarily setting the scale of the top view image, the arrangement position of the camera on the top view image, the height position of the camera, the horizontal and vertical installation angles of the camera, and the angle of view is also performed. The computer also creates a three-dimensional graphic that is a virtual photographed image of the camera based on the setting information and the top view data, and displays the same on a display device.

  According to this program, by setting the scale, camera placement, camera height, camera horizontal and vertical installation angles, and angle of view with respect to the top view, 3D graphics can be generated from the top view as 2D data. Can be created. Therefore, it is possible to create a virtual photographed image of the camera based on two-dimensional data that is relatively easy to obtain. Further, since a top view image is also displayed, it is possible to compare the top view with a virtual photographed image taken by the camera. In other words, the user can intuitively understand what kind of video can be taken before installing the camera, and the user carefully considers the desired shot image before installing the actual camera, Camera installation work can be done.

  The computer can also perform processing for arranging and displaying a photographing object indicator representing a photographing object and a camera indicator representing the camera at arbitrary positions on the top view image. In this case, processing for calculating the horizontal and vertical installation angles and the angle of view of the camera necessary for photographing the object to be photographed with a desired size with the camera is performed based on the arrangement position of each indicator. Is called. Examples of the desired size include various sizes such as a size where the entire object to be imaged is imaged and a size where the upper half of the object is imaged. Based on the calculation result of this process, the scale of the set top view image, the height position of the camera, the arrangement position of the camera indicator, and the top view data, A process of creating certain 3D graphics and displaying them on a display device is also performed.

  With this configuration, by arranging the shooting target indicator and the camera indicator on the top view, the virtual shooting video obtained by shooting the shooting target object corresponding to the shooting target indicator with the camera corresponding to the camera indicator is displayed. It can be created based on a top view which is two-dimensional data. In addition, in the virtual captured video, the object to be photographed automatically becomes a state of being photographed at a desired size. Therefore, in order to obtain a state of being photographed at a desired size, the user needs to set the horizontal and vertical positions of the camera one by one. There is no need to set the installation angle and the angle of view on the top view.

  Furthermore, the display elements can be arranged to move to different positions after being arranged at arbitrary positions on the top view image. In this case, the computer that executes the camera video simulator program needs the camera to capture the object to be photographed at a desired size with the camera according to the moving arrangement of one or both of the display elements. Recalculate the horizontal and vertical installation angles and angle of view. Based on the result of this recalculation, the scale of the set top view image, the height position of the camera, the placement position after the placement of the camera indicator, and the top view data, The 3D graphics that is the captured video is recreated and displayed on the display device.

  With this configuration, even if the position of the photographing object indicator or the camera indicator is moved on the top view, a virtual photographed image obtained by photographing the photographing object with a desired size is automatically obtained even at the changed position. Obtainable.

  The scale setting of the top view image is performed by superimposing a portion whose length is known in the top view image and a scaler indicator represented by a movable stretchable line segment, and the known length is a computer. Can be set as a scale in a virtual three-dimensional space based on the top view image.

  If comprised in this way, the setting of the scale in virtual three-dimensional space can be performed easily.

  A camera video simulator program according to an embodiment of the present invention is executed by a computer, for example, a personal computer, and displays an image as shown in FIG. 1 on the screen of a display device of the personal computer, for example, a liquid crystal display device. Although not shown, the personal computer includes a CPU as a calculation means, a memory as a storage means, a hard disk, a CD-ROM or DVD-ROM driver, a keyboard as an instruction means, a mouse and a tablet as pointing means, and the like. I have. This program is stored in a recording medium such as a CD-ROM or DVD-ROM, and is transferred from the recording medium to a memory or a hard disk. It is also possible to download from the server via the network.

  A window 2 serving as a base is displayed on the screen of the liquid crystal display device. In the upper left part of the window 2, an area display section, for example, a rectangular top view window 4 is displayed. In the top view window 4, a top view 6 representing a predetermined area, for example, a region where a camera is to be installed, for example, the inside or outside of a building, is displayed. The image data for displaying the top view 6 is two-dimensional image data. Although not shown, the file reading tab displayed on the base window 2 is selected by using a mouse or the like and read. Is. The image data to be read corresponds to various image formats. For example, the top view of the floor in the building or the image data of the architectural drawing received from the manager of the building or the top view printed on paper is used. It can be read by a scanner and captured as image data. As the image data, for example, image data in a bitmap format or JPEG format can be used. The top view window 4 displays only a part of the top view 6, and when displaying other parts of the top view 6 on the top view window 4, a slider 4 a at the bottom of the top view window 4 is provided. Operate or drag the pointer on the top view window 4. It is also possible to display the entire top view by changing the display magnification.

  A camera selection window 8 is displayed obliquely below the top view window 4. In the camera selection window 8, a model number of a plurality of cameras, for example, video cameras, a place where the cameras are used (for indoor use, for outdoor use), a minimum field angle, and a maximum field angle are displayed in a list format. Yes. The type of the camera can be specified from the model number of the camera and the place of use. When the contents of these lists are judged, the model number of the desired camera is selected with a mouse or the like, and dragged and dropped to an arbitrary position on the top view 6, a camera indicator which is a symbol representing the camera, for example, a camera top view display A child 10 is displayed on top of FIG. At the same time, another camera indicator which is a symbol representing a camera, for example, a camera elevation indicator 16 is also displayed in the elevation 14 in the elevation window 12 disposed below the top view window 4. Is done.

  At the same time, a horizontal field indicator 18 extending from the camera top view indicator 10 is displayed on the top view 6, and a vertical field indicator 20 extending from the camera elevation view indicator 16 is displayed on the elevation view 14. The horizontal visual field indicator 18 represents a horizontal visual field obtained by projecting a photographing range that can be photographed by the camera onto a horizontal plane, and the vertical visual field indicator 20 is a vertical plane through which the optical axis passes through the photographing range that can be photographed by the camera. It represents the vertical field of view projected onto.

  A scale indicator such as a scaler 22 is displayed in the top view window 4 by a solid line. The scaler 22 can be moved and expanded by the user's mouse operation. The user can move the scaler 22 to a known length portion (for example, the length of a building) displayed in the top view window 4 in advance. It is possible to set how many meters the scaler 22 is recognized by performing an overlapping operation. That is, if the known length is 10 m, the scale which is the conversion coefficient between the top view image and the actual size is set by setting the scaler 22 superimposed on the known length portion on the screen to 10 m. Is done. On the other hand, how many meters is recognized as the height from the ground indicator 24 of the height scale indicator 26 drawn by a broken line above the reference surface drawn on the elevation 14, for example, the ground indicator 24 representing the ground surface? Can also be set in advance by the user operating a mouse or the like. Further, in the elevation view 14, a camera position indicator 30 displayed vertically from the camera elevation indicator 16 to the ground indicator 24, and scale indicators 32, 32... Representing the distance from the camera position indicator 30. • is displayed.

  The horizontal visual field indicator 18 and the vertical visual field indicator 20 are arranged so that the camera is arranged at a predetermined height, a predetermined depression angle, and a predetermined direction when the camera upper surface indicator 10 is arranged in the top view 6. Is set and displayed as being in the maximum angle of view.

  The horizontal visual field indicator 18 is displayed in a trapezoidal shape, and an area inside the trapezoid is a range that can be photographed. The vertical visual field indicator 20 shows a photographing range of the camera projected on a plane perpendicular to the ground through the optical axis indicator indicated by reference numeral 34 in the elevation view 14, and a near indicator 20 a close to the ground indicator 24. And a far indicator 20b far from the ground indicator 24. A range surrounded by the near indicator 20a, the far indicator 20b, and the ground indicator 24 is a shootable range.

  The camera top surface indicator 10 can be changed in position by clicking on it with a mouse or the like and dragging it in any direction, and the position of the horizontal field indicator 18 is automatically recalculated accordingly. Then, by clicking and rotating the horizontal visual field indicator 18, the camera upper surface indicator 10, its direction (direction of the optical axis indicator 34), and the horizontal installation angle that is the direction of the horizontal visual field indicator 18 are changed. be able to.

  The camera elevation indicator 16 can change the height position of the camera elevation indicator 16 by clicking it with a mouse or the like and dragging it up and down. Further, the vertical installation angle can be changed by rotating the vertical visual field indicator 20 while clicking with the mouse or the like.

  In the above description, the description has been made on the assumption that the angle of view of the camera is the maximum, but by clicking the edge of the horizontal field indicator 18 or the vertical field indicator 20 with a mouse or the like and moving it inward, The horizontal visual field indicator 18 and the vertical visual field indicator 20 can be continuously changed until the angle of view is set to the minimum angle of view. On the contrary, from the state in which the angle of view is set to the minimum, the edge of the horizontal field indicator 18 or the vertical field indicator 20 is clicked with a mouse or the like and moved outward to bring the angle of view to the maximum angle of view. The horizontal field indicator 18 and the vertical field indicator 20 can be changed continuously.

  Below the camera selection window 8, shooting object icons such as a person icon 36 and a car icon 38 are displayed. When the person icon 36 or the car icon 38 is clicked and dragged and dropped onto the top view 6, a photographing target indicator, for example, a person top face indicator 40 or a car top face indicator 42 is displayed. The arrangement position and direction of the person upper surface indicator 40 or the vehicle upper surface indicator 42 can be changed by dragging. When these arrangement positions are in the horizontal visual field indicator 18, the person elevation indicator 44 or the vehicle elevation indicator (not shown) is displayed in the elevation view 14. Further, the user can input the height of the person represented by the person upper surface indicator 40 and the length of the car represented by the vehicle upper surface indicator 42 with the person upper surface indicator 40 or the car upper surface indicator 42. The width and depth dimensions of the person represented by the person upper surface indicator 40 are set in proportion to the input height, and similarly, the width and height dimensions of the car represented by the vehicle upper surface indicator 42 are also proportional to the length of the car. To be preset. Therefore, by setting the height and the length of the car as described above, all the three-dimensional data of the person and the car are obtained.

  In the 3D video display window 46 at the upper part of the camera selection window 8, a 3D video that is a virtual captured video corresponding to the imaging range determined by the horizontal visual field indicator 18 and the vertical visual field indicator 20 is displayed. This 3D image is a top view showing a state where the ground is viewed from the position and direction of the camera upper surface indicator 10 described above and the position of the three-dimensional coordinates of the camera determined from the position of the camera elevation indicator 16. The image obtained by the coordinate conversion is displayed as a range defined by the horizontal field indicator 18 and the vertical field indicator 20. The algorithm for obtaining this 3D video is, for example, as follows.

  The top view is two-dimensional data. Two-dimensional data can be considered as a plane in a three-dimensional space. Using this idea, as shown in FIG. 3B, a three-dimensional space stretched by three orthogonal axes of Xw, Yw, and Zw is constructed so that the top view is a zero-height plane in the three-dimensional space. To do. 3A is the origin 0 of the three-dimensional space, the right direction of the top view is + Xw, the top direction of the top view is + Yw, and from the back of the top view (FIG. 3A). The three-dimensional space is configured so that the direction from the back side to the front side of the sheet is + Zw. The scale of the three-dimensional space is configured to be the same as that in the top view.

  Here, it is assumed that the installation information of the camera is given as follows by the user's operation on the top view and the elevation view as described above.

Camera information Value Camera coordinates on top view uc, vc (pix) Set on top view Camera height h (mm) Set on top view Camera horizontal installation angle θ (rad) Set on top view Vertical installation angle of the camera ρ (rad) Set on the elevation view Conversion factor between top view and actual size k (pix / mm) Set with the scaler Horizontal view angle of the camera θh (rad) Set on the top view Vertical view angle of the camera θv (rad) Set on elevation

In the 3D video creation program, for example, when OpenGL is used as a library for creating 3D graphics, the 3D placement position of the camera and the point of sight (the tip of the optical axis mentioned above intersects the object to be photographed). Point) If the angle of view is set, an image in the three-dimensional space viewed from the camera can be drawn. Of the three-dimensional camera positions (xc, yc, zc) under the above conditions, xc and yc are derived from the camera coordinates (uc, vc) on the top view. Xc = uc, yc = vc
Is required. For zc, the height h (mm) set on the elevational view 14 is used. However, since the scale of the three-dimensional space is configured to be the same as the top view as described above, zc must be obtained in units of pixels. For this reason, the scaler 22 set on the top view is used. Using the conversion coefficient k (pix / mm) obtained by the scaler 22 set on the top view, zc is
zc = h * k
Is required. This makes it possible to calculate the camera position that maintains the positional relationship with the top view in the three-dimensional space. Here, the scale of the three-dimensional space is set in units of pixels, but by using the setting of the scaler 22, it can be set in units of millimeters.

The gazing point O of the camera in the three-dimensional space is calculated using the camera positions xc, yc, zc, the horizontal installation angle θ, and the vertical installation angle ρ. Here, if the gazing point O is on the Xw-Yw plane, the distance r from the point (xc, yc, 0) to the gazing point O is
r = zc / tanρ
Is required. Of the coordinates (xo, yo, 0) of the gazing point O, xo and yo are
xo = xc + r · cos θ
yo = yc + r · sin θ
Is required.

Further, the horizontal field angle θh and the vertical field angle θv of the camera are also set. By the way, the horizontal angle of view and the vertical angle of view of the normal camera are in a relationship in which one is determined and the other is also dependently determined. Therefore, it is only necessary to set one of the horizontal field angle and the vertical field angle of the camera.
Therefore, by using the camera position, the gazing point, and the angle of view calculated in these three-dimensional spaces, it is possible to generate a camera simulation image that accurately reflects the installation conditions specified by the user.

  However, since the three-dimensional data is prepared for the person and the car corresponding to the person upper surface indicator 40 and the car upper surface indicator 42 as described above, the person upper surface indicator 40 and the car upper surface indicator 42 are in the horizontal field of view. When all or part of the display 18 is in the display 18, or when all or part of the person's elevation indicator 44 or vehicle elevation is in the vertical field indicator 20, the corresponding image is displayed in 3D. Three-dimensional display is performed on the video display unit 46. Moreover, the image is displayed as corresponding to the size seen from the camera.

  Therefore, for example, when the camera is to be used for monitoring, the person upper surface indicator 40 and the vehicle upper surface indicator 42 are arranged at a place to be monitored, the arrangement position and direction of the camera upper surface indicator 10 are changed, and the camera By adjusting the height and depression angle of the surface indicator 16, it is possible to recognize from the display on the 3D video display window 46 how a person or a car can be photographed. Further, by dragging the person upper surface indicator 40 or the car upper surface indicator 42, it is possible to recognize from the display of the 3D video display window 46 how the moving person or car is displayed.

The above description is for the case where only one camera upper surface indicator 10 is displayed. However, a plurality of camera upper surface indicators 10 are simultaneously displayed on the top view 6 and the horizontal field of view of the plurality of cameras is simultaneously displayed. The child 18 can also be displayed on the top view 6. In this case, the elevation view 14 displays the camera elevation indicator 16 and the vertical field indicator 20 corresponding to the camera top view indicator 10 selected with the mouse or the like in the top view, and displays the 3D video display window 46. Displays a virtual photographed image corresponding to the camera top view indicator 10 selected with the mouse or the like in the top view.
Further, a plurality of elevation views 14 and 3D video display windows 46 are prepared, and elevation views and three-dimensional virtual captured images corresponding to a plurality of cameras can be displayed simultaneously.

  Further, in this embodiment, in addition to the display as described above, the camera is arranged at a desired camera arrangement position, and the photographing object arranged at the photographing object arrangement position is changed to a desired size from the camera photographing position. It is also possible to automatically set the horizontal and vertical installation angles and angle of view of the camera necessary for shooting.

  For example, as shown in FIG. 2, the person upper surface indicator 40 is arranged at the photographing object arrangement position which is the position where the camera wants to shoot, and the camera upper surface indicator 10 is directed to an arbitrary direction at the desired camera installation position. Is displayed. In this state, when the mouse is right-clicked on the camera upper surface indicator 10, a plurality of target angles of view, for example, a target angle of view for photographing the upper half of the photographing object, a target angle of view for photographing the whole photographing object, and photographing. There are a total of four target angles of view for shooting in a state where the entire object occupies 1/2 of the height of the screen, and a target angle of view for shooting in a state where the entire photographic object occupies 1/3 of the height of the screen. An angle of view is displayed. Click the desired target angle of view.

  Thus, the camera and the object to be imaged are associated with each other, and an association line indicator 58 indicated by a one-dot chain line in FIG. When the line indicator 58 is dragged to the person upper surface indicator 40 with the mouse and clicked on the person upper surface indicator 40, the camera upper surface indicator 10 moves the person upper surface indicator 40 side as shown by an arrow in FIG. The horizontal field indicator 18 displays the shooting range for shooting with the direction and the specified target angle of view. Although not shown, the vertical field indicator 20 displays a shooting range for shooting at a specified target angle of view. At the same time, the 3D video display window 46 displays a virtual captured video that simulates a state in which a person is captured at a specified target angle of view using 3D graphics. The camera top surface indicator 10 and the person top surface indicator 40 are associated with each other when the plurality of camera top surface indicators 10 and the plurality of person top surface indicators 40 are displayed on the top view 6. This is because the camera represented by the upper surface indicator 10 determines which person the upper surface indicator 40 represents. The same can be done for the vehicle upper surface indicator 42.

  In the state where the camera upper surface indicator 10 faces the human upper surface indicator 40 as described above and the shooting range for photographing at the specified angle of view is displayed by the horizontal visual field indicator 18, for example, the upper surface character indicator 40 is displayed. When dragging with the mouse, the camera is displayed horizontally and vertically so that the camera represented by the camera upper surface indicator 10 can continue to shoot a person while maintaining the set target angle of view as the upper surface character indicator 40 moves. The installation angle and the angle of view are changed, and the virtual captured video of the 3D video display window 46 is changed in accordance with the change. Similarly, when the camera upper surface indicator 10 is dragged with the mouse, the camera upper surface indicator 10 is horizontally and vertically aligned so that the person represented by the upper surface character indicator 40 can be continuously photographed while maintaining the angle of view set by the camera. The installation angle is changed, and the virtual captured video of the 3D video display window 46 is changed in accordance with the change.

  Hereinafter, in order to perform the display as described above, the camera level is such that shooting of a person can be continued with the set target angle of view maintained according to the movement of the camera upper surface indicator 10 or the upper surface character indicator 40. It is necessary to automatically obtain the installation angle, the vertical installation angle, and the angle of view. An algorithm for obtaining these will be described.

  In FIG. 5, the user changes the position of the camera upper surface indicator 10 or the camera elevation surface indicator 16 by operating the mouse or the like, and the camera installation position C is determined. Assume that coordinates (xc, yc, zc) have been acquired. Similarly, the user changes the position of the person upper surface indicator 40 or the person elevation indicator 44 by operating the mouse or the like to determine the position of the person, and the coordinates (xo, It is assumed that yo, 0) has been acquired. Further, it is assumed that the height Ho of the person is given by a user setting or a program default value.

  Assume that the camera gazes at a gaze point O (xo, yo, zo) on a person. The height zo of the gazing point O is determined by setting the target angle of view, such as whether to shoot the upper half of the photographic object described above or the entire photographic object. For example, zo = Ho / 2 is set when shooting the entire shooting target, and zo = Ho * 3/4 is set when shooting the upper half of the shooting target. Now, let zo = Ho / 2.

When the horizontal installation angle θ of the camera is an angle with respect to the + Xw axis direction, tan θ is
tan θ = [(yo−yc) / (xo−xc)]
So
θ = tan ⁻¹ [(yo−yc) / (xo−xc)]
It is obtained.

Next, the vertical installation angle ρ is obtained. The vertical installation angle ρ is an angle formed by a straight line connecting the camera installation position C and the gazing point O with respect to a plane passing through the camera installation position C and parallel to the Xw-Yw plane. Here, let P ′ be the intersection of a vertical line standing on the Xw-Yw plane from the camera installation position and a straight line extending from the gazing point O toward this vertical line. The intersection point of the perpendicular line to the Xw-Yw plane is defined as P point. Since the vertical installation angle ρ is equal to the angle COP ′, the angle COP ′ may be obtained. If tanCOP ′ is the distance between P′O, r,
tanCOP ′ = (zc−zo) / r
Is required. As is apparent from FIG. 5, the distance r is
r = [(xo-xc) ² + (yo-yc) ² ] ^1/2
Is required. Therefore, ρ is
ρ = tan ⁻¹ [(zc-zo) / r]
Is required.

Next, the angle of view set for the camera is calculated. Here, the vertical angle of view θv is derived using FIG. 6 so as to satisfy the target angle of view as described above. At this time, assuming that the target angle of view is set so that the whole image of the person to be photographed is displayed at the full height of the screen, the person's height Ho with the gaze point O as the center as shown in FIG. It is only necessary to calculate the angle of view so that a range of a length V converted from a pixel value is captured. At this time, if V is set to be perpendicular to the line segment OC, the vertical field angle θv is an angle between both ends of the vertical line segment passing through the center of the screen and the coordinate position C of the camera. Therefore, tan (θv / 2) is
tan (θv / 2) = (V / 2) / OC
Is required. Segment OC is determined by the square root of the sum of the squares ^{(zo-zc) 2} of the square ^{r 2} of r as described above (zo-zc). Therefore, θv / 2 is
θv / 2 = tan ⁻¹ {(V / 2) / [(xo−xc) ² + (yo−yc) ² + (zo−zc) ² ] ^−1/2 }
Is required.

  3D graphics are created in accordance with the vertical angle of view θv, the horizontal installation angle θ, the vertical installation angle ρ, and the installation position obtained in this manner, and displayed on the 3D video display window 46.

  When the vertical angle of view is determined in this way, the vertical direction of the screen can always be taken with the length V regardless of the vertical installation angle ρ of the camera. For example, the subject to be photographed is directly under the camera. Even in this case, the vertical angle of view θv does not become zero, and the object to be photographed can be projected. However, as the vertical installation angle ρ increases, the manner in which the object to be photographed is smaller than the desired size. Therefore, as shown in FIG. 7, it is possible to determine a vertical angle of view θv such that the object to be photographed is projected in the full length of the screen. In this method, even if the vertical installation angle ρ increases, the object to be photographed is projected at a set size.

In FIG. 7, assuming that the coordinates of the person's feet are O ′ and the angle O′CP is θb, by using the vertical installation angle ρ, θv / 2 is
θv / 2 = (π / 2−ρ) −θb
It is represented by tanθb is
tan θb = zc / r
Therefore, θb is
θb = tan ⁻¹ (zc / r)
It is represented by As described above, r is
r = [(xo-xc) ² + (yo-yc) ² ] ^1/2
Therefore, θb is
θb = tan ⁻¹ {zc / [(xo−xc) ² + (yo−yc) ² ] ^−1/2 }
Is required. Therefore, θv / 2 is
θv / 2 = (π / 2−ρ) − (tan ⁻¹ {zc / [(xo−xc) ² + (yo−yc) ² ] ^−1/2 })
Is required.

  In this method, the angle of view can be set so that the object to be photographed is projected vertically across the screen regardless of the vertical installation angle ρ. However, as the vertical installation angle increases, the vertical angle of view θv decreases, and becomes zero when the camera faces straight down.

  As described above, each of the two methods has advantages and disadvantages according to the vertical installation angle ρ. Therefore, either method may be selected by the user, or a predetermined vertical installation angle ρ, for example, 45 may be selected. The latter method can be automatically selected when the angle is less than or equal to 45 degrees, and the former method can be automatically selected when the angle is 45 degrees or more.

  Using the vertical angle of view θv thus obtained, 3D graphics is created and displayed on the 3D video display window 46 in the same manner as described above.

It is a figure which shows the image which the computer is displaying based on the camera installation simulator program of one Embodiment of this invention. FIG. 2 is a partially enlarged view of the image of FIG. 1. It is explanatory drawing of the relationship between a top view and three-dimensional space by the camera installation simulator program of embodiment. It is explanatory drawing of the calculation method of the installation position of a camera and the gaze point in the three-dimensional space of FIG. It is explanatory drawing of the method of calculating | requiring the horizontal installation angle and vertical installation angle of the camera for simulating with the camera installation simulator program of the embodiment. It is explanatory drawing of an example of the method of calculating | requiring the vertical angle of view of the camera for simulating with the camera installation simulator program of embodiment. It is explanatory drawing of the other example of the method of calculating | requiring the vertical view angle of the camera for simulating with the camera installation simulator program of embodiment.

Explanation of symbols

4 Top View Display Window 6 Top View 10 Camera Top Indicator 12 Elevation View Display Window 14 Elevation View 16 Camera Elevation Indicator 18 Horizontal Field Indicator 20 Vertical Field Indicator

Claims (4)

A camera image simulator program for simulating a captured image when a camera is arranged at an arbitrary position in a predetermined area,
A computer that executes the camera video simulator program includes:
Processing for displaying a part or all of the top view image of the predetermined area on the display device based on the top view data of the predetermined area;
Processing for arbitrarily setting the scale of the top view image, the placement position of the camera on the top view image, the height position of the camera, the horizontal and vertical installation angles, and the angle of view;
Based on these setting information and the top view data, to create a three-dimensional graphics that is a virtual captured video of the camera, and to display on the display device,
A camera image simulator program characterized by being performed. A computer that executes the camera video simulator program includes:
A process of displaying a shooting target indicator representing a shooting target and a camera indicator representing the camera arranged at arbitrary positions on the top view image, respectively,
A process of calculating the horizontal and vertical installation angles and the angle of view of the camera necessary for photographing the object to be photographed with a desired size with the camera based on the arrangement position of each indicator;
Based on the calculation result, the scale of the set top view image, the height position of the camera, the arrangement position of the camera indicator, and the top view data, it is a virtual photographed image of the camera. Processing to create three-dimensional graphics and display on the display device;
The camera image simulator program according to claim 1, wherein the camera image simulator program is executed. Each of the indicators can be moved and arranged at different positions after being arranged at an arbitrary position on the top view image,
A computer that executes the camera video simulator program includes:
The horizontal and vertical installation angles and angle of view of the camera after the moving arrangement necessary for photographing the object to be photographed with a desired size with the camera according to the moving arrangement of one or both of the indicators. Processing to recalculate
Based on the result of this recalculation, the scale of the set top view image, the height position of the camera, the placement position after the placement of the camera indicator, and the top view data, Re-creating three-dimensional graphics that are virtual images and displaying them on the display device;
3. The camera image simulator program according to claim 2, wherein the camera image simulator program is executed.   The scale setting of the top view image is performed by superimposing a portion whose length is known in the top view image and a scaler indicator represented by a movable stretchable line segment, and the known length is a computer. The camera image simulator program according to claim 1, wherein the camera image simulator program is set as a scale in a virtual three-dimensional space based on the top view image.

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