JP2012221105A - Image processing system, image processing method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an arbitrary designation of a polygon face to be texture-mapped and to avoid inappropriate texture-mapping.SOLUTION: An image generation unit generates a computer graphic image based on CG descriptive data. A user selects an object or material and designates a polygon face in the CG descriptive data through a target designation unit. An image mapping unit performs texture-mapping of a predetermined image onto the polygon face designated by the target designation unit. A mapping condition check unit checks whether or not the polygon face designated by the target designation unit has a condition for the texture-mapping. When it is determined that the polygon face has a condition for the mapping, the image mapping unit performs mapping of the predetermined image onto the polygon face designated by the target designation unit.

Description

  The present technology relates to an image processing device, an image processing method, and a program. In particular, the present technology relates to an image processing apparatus that texture maps an image on the surface of a computer graphics object.

  In the three-dimensional graphics system, the whole image is drawn by decomposing the three-dimensional coordinates into polygons such as triangles and drawing the polygons. Therefore, in this case, it can be said that the three-dimensional image is defined by a combination of polygons. By the way, the surface of an object around us often has a repeated pattern of complicated patterns, and as the patterns and patterns become more complicated and finer, it becomes more difficult to model each pattern or pattern with a triangle or the like. Therefore, texture mapping is used as a means for solving this problem.

  Texture mapping achieves a high-reality image with a small number of vertices by pasting image data captured by a scanner or the like onto the surface of the object. From the object coordinate system to the texture coordinate system. Furthermore, the mapping from the window coordinate system to the texture coordinate system is obtained, and the texture element corresponding to each pixel (Pixel, Picture Cell Element) in the window coordinate system (Texel: Find Texture Cell Element).

  Image data used for the texture is stored in a memory area called a texture memory. Therefore, if a process of updating the texture memory as needed using moving image data is performed, a texture mapping process using moving images can be performed.

  For example, Patent Document 1 describes an image processing device that texture maps an image to a CG image generated based on CG (computer graphics) description data.

  In the CG description data, the color and reflection characteristics of the surface of the virtual object are defined as characteristics called materials and assigned to each surface of each virtual object. As a result, the appearance when rendering is calculated, and the color and reflection are determined. A material may have a texture file to be texture mapped.

  The texture file is an image file, and the result is that it is pasted on the target surface. The pasting position and expansion / contraction are determined by values given to the vertices of each polygon called texture coordinates (UV coordinates). The texture coordinates indicate a correspondence relationship between each textured polygon and a texture file as a two-dimensional area having values of 0 and 1 for both x and y.

JP 2011-022728 A

  For example, in order to change a CG image according to a situation for broadcasting, an apparatus capable of texture mapping an arbitrary selected image on an arbitrary surface in the CG is required. In that case, since the options are all faces (a set of polygons), they are not necessarily faces created with the intention of texture mapping at the time of CG production. In the CG description data, the texture coordinates may not be defined for a surface that is not texture-mapped.

  If texture mapping is performed on a surface with undefined texture coordinates, the correspondence with each pixel of a still image, which is a texture file, cannot be calculated, and the display becomes impossible. Even if texture coordinates and other attributes are defined, depending on the texture file, the mapped image may be in an inappropriate state depending on the pasting direction, the position offset on the surface, and the like.

  An object of the present technology is to make it possible to arbitrarily specify a polygon surface to be texture-mapped, and to prevent inappropriate texture mapping from being performed.

The concept of this technology is
An image generator for generating a computer graphics image based on the computer graphics description data;
A target designating unit for receiving an operation input for designating a polygonal surface in the computer graphics description data;
An image mapping unit for texture-mapping a predetermined image on the surface of the polygon designated by the target designation unit;
A mapping condition check unit for determining whether or not the polygon surface specified by the target specifying unit has a texture mapping condition;
The image mapping unit
When the mapping condition check unit determines that a texture mapping condition is provided, the image processing apparatus is configured to texture-map a predetermined image on the surface of the polygon designated by the target designation unit.

  In the present technology, a computer graphics image is generated by the image generation unit based on the computer graphics description data. In addition, the target designating unit designates a polygon surface in the computer graphics description data. Then, the image mapping unit texture maps a predetermined image on the surface of the polygon designated by the target designation unit.

  At this time, the mapping condition check unit checks whether or not the surface of the polygon designated by the target designation unit has a texture mapping condition. When it is determined that the texture mapping condition is satisfied, the image mapping unit texture-maps a predetermined image on the surface of the polygon designated by the target designation unit.

  For example, the image generation unit performs a real-time rendering operation on the frame rate of the output image, and the image mapping unit determines that the mapping condition check unit has a texture mapping condition for each frame image generation. A predetermined image is texture-mapped on the surface of the polygon.

  As described above, in the present technology, the user can arbitrarily designate a polygon surface to be texture-mapped by the target designation unit. Further, the image is not texture-mapped on all the polygonal surfaces specified by the target specifying unit, and the image is texture-mapped only on the polygonal surfaces having the texture mapping conditions. Therefore, it is possible to avoid mapping an image in an inappropriate state on the surface of the polygon.

  In the present technology, for example, the target designation unit may be configured not to receive an operation input for designating a polygon surface that is not determined to have the mapping condition by the mapping condition check unit. For example, the target designating unit rejects an operation input designating the surface of the polygon or makes an error. Further, for example, the target designating unit does not display the polygon surface as an option. As a result, it is possible to avoid in advance that the user designates a polygon surface that does not have a mapping condition, and operability can be improved.

  In the present technology, for example, the mapping condition check unit determines that the texture mapping condition is not provided when the texture coordinates are not defined on the surface of the polygon designated by the target designation unit. May be. This is because if texture mapping is performed on a surface where the texture coordinates are undefined, the correspondence with each pixel of the image cannot be calculated, and the display becomes impossible.

  In this case, for example, when the target designating unit determines that the polygon surface designated by the target designating unit does not have a texture mapping condition, the geometric shape for determining texture coordinates in the computer graphics virtual space is used. The texture coordinates may be determined by projecting the surface of the image onto the surface of the designated polygon, and the texture coordinates may be assigned to the surface of the designated polygon. As a result, even if the texture coordinates are undefined on the surface of the designated polygon, the image can be appropriately texture-mapped.

  Further, in the present technology, for example, the mapping condition check unit does not include a texture mapping condition when the distortion on the polygon is greater than or equal to a threshold value for the texture coordinates of the polygon surface specified by the target specifying unit. Judgment may be made. Here, the distortion means that the distance is the same in the texture coordinates, but the distance is different depending on the location in the CG space. In this case, since the image is deformed or distorted, it is not suitable for texture mapping.

  In the present technology, for example, when the image mapping unit texture maps a stereo image to the polygon surface specified by the target specifying unit, the mapping condition check unit has the polygon surface on an axis perpendicular to the screen of the output image. On the other hand, when there is a rotation greater than or equal to the threshold value, it may be determined that the texture mapping condition is not provided. In this case, the left-right image and the right-eye image are shifted from each other up and down due to the rotation, which makes it difficult to display a stereoscopic image appropriately.

  In this case, for example, when the image mapping unit determines that the polygon surface specified by the target specifying unit does not have a texture mapping condition by the mapping condition check unit, only the left-eye image or the right-eye image is displayed. Mapping may be performed. In this case, a two-dimensional image instead of a stereoscopic image is displayed on the surface of the polygon, and it is possible to texture-map the image on this surface.

  In the present technology, for example, when the image mapping unit texture maps a stereo image to the polygon surface specified by the target specifying unit, the mapping condition check unit has the polygon surface on an axis parallel to the screen of the output image. On the other hand, when there is a rotation greater than or equal to the threshold value, it may be determined that the texture mapping condition is not provided. In this case, for example, when rotating around the x-axis, the parallax between the left-eye image and the right-eye image should be reduced, but the parallax between the left-eye image and the right-eye image parallax is not reduced. Therefore, it becomes an unnatural stereoscopic image display.

  In this case, for example, when the polygon mapping surface specified by the target specification unit determines that the mapping condition check unit does not have a texture mapping condition, the image mapping unit performs mapping using only the left eye image or the right eye image. Doing so may be done. In this case, a two-dimensional image instead of a stereoscopic image is displayed on the surface of the polygon, and it is possible to texture-map the image on this surface.

  Also, in this case, for example, when the image mapping unit determines that the polygon surface specified by the target specifying unit does not have the texture mapping condition by the mapping condition check unit, the image for the left eye and the image for the right eye Texture mapping may be performed by reducing parallax between images. In this case, an unnatural stereoscopic image can be prevented from being displayed on the designated polygon surface.

  According to the present technology, a polygon surface to be texture-mapped can be arbitrarily specified, and inappropriate texture mapping can be avoided.

It is a block diagram showing an example of composition of an image processing device as an embodiment of this art. It is a figure which shows the example of GUI which enabled selection of arbitrary objects or materials from the display choice. It is a figure which shows the example of GUI which enabled selection of arbitrary objects or materials from the display choice. It is a figure which shows an example of the image which should be texture-mapped, and a texture mapping result. It is a block diagram which shows the structural example of an image generation part (an image mapping part and a mapping condition check part). It is a figure which shows the structural example of the functional block of an image generation part (an image mapping part and a mapping condition check part). It is a flowchart which shows the procedure of the texture mapping process during the rendering in an image generation part. It is a figure which shows the example which determines a texture coordinate by projecting from a plane. It is a figure which shows the example which distortion or distortion arises in the image mapped on the polygon. It is a figure for demonstrating rotation with respect to the Z-axis of the surface of a polygon in the case of texture-mapping a stereo image. It is a figure for demonstrating rotation with respect to the X-axis, the Y-axis, etc. of the surface of a polygon in the case of texture-mapping a stereo image. It is a figure which shows the relationship between the parallax between the image for left eyes, and the image for right eyes, and the depth of a to-be-photographed object. It is a flowchart which shows the process sequence of the texture mapping of the stereo image to the some polygon surface in an image mapping part. It is a flowchart which shows the process sequence of the option display of the object (node) in a target operation part. It is a block diagram which shows the other structural example of an image processing apparatus. It is a figure which shows an example of a program output and the preview output with respect to it.

Hereinafter, modes for carrying out the invention (hereinafter referred to as “embodiments”) will be described. The description will be given in the following order.
1. Embodiment 2. FIG. Modified example

<1. Embodiment>
[Configuration of image processing apparatus]
FIG. 1 shows a configuration example of an image processing apparatus 100 as an embodiment of the present technology. The image processing apparatus 100 includes a CG (computer graphics) production unit 110, a network 120, an image generation unit 130, an image mapping unit 140, a mapping condition check unit 190, and a storage unit 150. The image processing apparatus 100 further includes a matrix switch 160, an image selection operation unit 170, and an image composition unit (program / preview mixer) 180. The CG production unit 110, the image generation unit 130, and the image selection operation unit 170 are each connected to the network 120.

  The CG production unit 110 is configured by a personal computer (PC) having CG production software. The CG production unit 110 outputs CG description data in a predetermined format. As a format of CG description data, for example, Collada (registered trademark) is available. Collada is a description definition for realizing the exchange of 3D CG data on XML (Extensible Markup Language). In the CG description data, for example, the following information is described.

(A) Definition of Material (Surface Aspect) The definition of this material is the surface quality (appearance) of the CG object. The definition of this material includes information such as color, reflection method, light emission, and unevenness. The material definition may include texture mapping information. As described above, texture mapping is a method of pasting an image on a CG object, and can express a complicated pattern or the like while relatively reducing the load on the processing system.

(B) Definition of Geometric Information Geometry The definition of the geometric information Geometry includes information such as position coordinates and vertex coordinates about the polygon mesh.
(C) Camera definition This camera definition includes camera parameters.

(D) Definition of Animation This animation definition includes various information in each key frame of the animation. Further, the definition of the animation includes time information at each key frame of the animation. The various information is, for example, information such as the time of the key frame point of the corresponding object (node), the coordinate value of the position and the vertex, the size, the tangent vector, the interpolation method, and changes in various information during animation.
(E) Node (object) position, direction, size, corresponding geometric information definition in the scene, and corresponding material definition

These pieces of information are not separated but are associated as follows, for example.
・ Node ・ ・ ・ Geometry information ・ Node ・ ・ ・ Material (s)
・ Geometry information: Polygon set (multiple)
・ Polygon set: Material (one of the nodes)
・ Animation ・ ・ ・ Node

  A description constituting one screen is called a scene. Each definition is called a library and is referenced from within the scene. For example, when there are two cuboid objects, each is described as one node, and each node is associated with one of the material definitions. As a result, a material definition is associated with each rectangular parallelepiped object, and the object is drawn with a color and reflection characteristics according to each material definition.

  Alternatively, a rectangular parallelepiped object is described by a plurality of polygon sets, and when a material definition is associated with the polygon set, each polygon set is drawn with a different material definition. For example, there are six rectangular parallelepiped faces, but three of these faces have one polygon set, one polygon set on one face, one polygon set on two faces, and so on. In some cases, it is described by a set of three polygons. Since different material definitions can be associated with each polygon set, it is possible to draw different colors for each surface.

  When texture mapping is designated in the material definition, an image based on image data is texture-mapped on the associated object surface.

  For example, it is set to texture-map the image with respect to the material definition. Therefore, the same image can be texture-mapped on all the faces of the rectangular parallelepiped object, and different images can be texture-mapped for each face.

  The matrix switch 160 selectively extracts a predetermined image (image data) from a plurality of input images (input image data). The matrix switch 160 includes 10 input lines, 13 output bus lines 211 to 223, and 13 crosspoint switch groups 231 to 243. The matrix switch 160 constitutes a part of the effect switcher, and is used to supply image data to the image mapping unit 140 as an external device and to supply image data to the internal image composition unit 180 and the like. The

  The output bus lines 211 to 214 are bus lines for supplying image data to the image mapping unit 140. The output bus lines 215 to 221 are bus lines for outputting image data to the outside. The output bus lines 222 and 223 are bus lines for supplying image data to the internal image composition unit 180.

  The ten input lines are arranged in one direction (horizontal direction in FIG. 1). Image data is input to the input lines “1” to “9” from a VTR, a video camera, or the like. The CG image data output from the image generation unit 130 is input to the input line “10”. The 13 output bus lines 211 to 223 intersect with the input lines and are arranged in other directions (vertical direction in FIG. 1).

  The cross point switch groups 231 to 234 perform connection at each cross point where the 10 input lines intersect with the output bus lines 211 to 214. Based on the user's image selection operation, the connection of the cross point switch groups 231 to 234 is controlled, and any of the image data input to the 10 input lines is selectively output to the output bus lines 211 to 214. The The output bus lines 211 to 214 form output lines for texture mapping image data (mapping inputs) T1 to T4.

  Further, the cross point switch groups 235 to 241 perform connection at each cross point where the 10 input lines and the output bus lines 215 to 221 cross each other. The crosspoint switch groups 235 to 241 are controlled based on the user's image selection operation, and any of the image data input to the 10 input lines is selectively output to the output bus lines 215 to 221. The output bus lines 215 to 221 constitute output lines for image data OUT1 to OUT7 for external output.

  Further, the cross point switch groups 242 and 243 perform connection at each cross point where the 10 input lines intersect with the output bus lines 222 and 223, respectively. Based on the user's image selection operation, the cross point switch groups 242 and 243 are controlled, and any of the image data input to the ten input lines is selectively output to the output bus lines 222 and 223.

  Note that the on / off operations of the cross point switches of the cross point switch groups 231 to 243 are performed within a vertical blanking interval, which is a frame break, because the image data is composed of continuous frame data.

  The image data output to the output bus lines 222 and 223 is input to the image composition unit (program / preview mixer) 180. The image composition unit 180 performs composition processing on image data input from the output bus lines 222 and 223. A program (PGM) output is output to the outside from the image synthesis unit 180 through the program output line 251, and a preview output is output to the outside through the preview output line 252.

  The image selection operation unit 170 receives an instruction operation input to the matrix switch 160. The image selection operation unit 170 includes an operation console (not shown) including a push button row for operating on / off of the switches of each cross point switch group of the matrix switch 160.

  The image selection operation unit 170 includes a target designation unit 171. The target designating unit 171 receives an operation input for designating a polygon surface in the CG description data to be texture-mapped. The target designating unit 171 designates an object (node) or a material (surface mode) associated with a polygon surface in order to designate a polygon surface to be texture-mapped.

  The target designation unit 171 designates a mapping target image as well as a polygon face to be texture-mapped. The target image is, for example, an image of an image file held by the image generation unit 130 or an image input from the matrix switch 160. This image may be either a still image or a moving image.

  In the target designating unit 171, for example, an object or material is selected on the basis of display of an option of an object and / or material on a display unit (not shown), thereby designating a polygon surface to be texture-mapped. Made.

  FIG. 2 shows a GUI example in which an object or material in CG description data is selectively displayed, and an arbitrary object or material can be selected from the display options. In this example, “Video 1” to “Video 5” are displays for designating images, and “Video 1” is selected in the figure.

  FIG. 3 shows an example of a GUI in which objects or materials in CG description data are displayed in a tree form, and an arbitrary object or material can be selected from the display options. In this example, the object “Group1” is selected. “Video 1” to “Video 5” are displays for designating an image, and “Video 5” is selected in the figure.

  The image generation unit 130 generates a CG image that is a three-dimensional space image based on the CG description data produced by the CG production unit 110. The storage unit 150 stores CG description data. When the CG description data is read, the image generation unit 130 stores information such as each definition on the memory, and also stores the correspondence thereof as a data structure. The image generation unit 130 also stores various values in key frames for executing animation in the memory.

  For example, in order to draw a polygon set in the geometric information of a certain node, the drawing is performed according to the designation of the color or the like with reference to the geometric information and the associated material definition. In the case of animation, the current time is advanced every frame, each value in the preceding and following key frames is determined from the current time to determine each value, and drawing is performed.

  The image generation unit 130 controls the image mapping unit 140 so that the image specified by the target specifying unit 171 is similarly texture-mapped on the polygon surface specified by the target specifying unit 171 of the image selection operation unit 170. .

  The image mapping unit 140 performs texture mapping under the control of the image generation unit 130. FIG. 4 shows an example of texture mapping. FIG. 4A shows an image to be texture mapped. FIG. 4B shows the result of texture mapping of the image of FIG. 4A onto the polygon plane when texture coordinates are defined as shown in the figure.

  The mapping condition check unit 190 determines whether the polygon surface designated by the target designating unit 171 has a texture mapping condition. When the mapping condition check unit 190 determines that the texture mapping condition is provided, the image mapping unit 140 texture-maps the image onto the polygon plane specified by the target specifying unit 171. Details of the determination in the mapping condition check unit 190 will be described later.

  Note that when the CG includes animation, or when controlled by a joystick or the like in real time, the parameter changes for each frame (field). Since the rotation angle and distortion of the surface of the polygon that is texture-mapping also change, the conditions suitable for texture mapping become unsuitable over time (operation). Therefore, the mapping condition check unit 190 determines whether or not a condition is provided every time rendering is performed, and the image mapping unit 140 performs or cancels texture mapping based on the determination result.

  Further, the material associated with each polygon in the CG description data can be changed based on a user operation from the image selection operation unit 170. In this case, when the material corresponding to a certain polygon is changed, the changed material may be the material selected by the target specifying unit 171. In this case, if the surface of the polygon has a texture mapping condition, the surface of the polygon is a target for texture mapping.

  Even if the texture mapping is canceled, the image is not disturbed. Since it becomes the virtual object surface in the original state at the time of CG data production, it does not give an unpleasant feeling to the viewer and can provide an image having higher value than continuing inappropriate texture mapping. The texture coordinates themselves (UV coordinate system) may be the target of animation or operation.

  For example, the image mapping unit 140 and the mapping condition check unit 190 are integrated with the above-described image generation unit 130, and are realized by software control on the CPU and operation by hardware such as a GPU. . The control software designates a polygon set to be texture-mapped and instructs the hardware.

[Configuration example of image generation unit]
FIG. 5 shows a configuration example of the image generation unit 130 (including the image mapping unit 140 and the mapping condition check unit 190). The image generation unit 130 includes an image input / output unit 141, a GPU 142, a local memory 143, a CPU 144, and a main memory 145. The image generation unit 130 includes a peripheral device control unit 146, a hard disk drive (HDD) 147, an Ethernet circuit 148a, and a network terminal 148b. Further, the image generation unit 130 includes a USB (Universal Serial Bus) terminal 149 and an SDRAM (Synchronous DRAM) 151. “Ethernet” is a registered trademark.

  The image input / output unit 141 inputs image data for texture mapping, and outputs image data of a CG image in which an image based on the image data is appropriately texture mapped. The image input / output unit 141 can input a maximum of four systems of image data, and can output a maximum of four systems of image data. The image data handled here is, for example, HD-SDI (High Definition television-Serial Digital Interface) standard image data defined by SMPTE292M. The GPU 142 and the main memory 145 are equally accessible to the image input / output unit 141.

  The main memory 145 functions as a work area for the CPU 144 and temporarily stores image data input from the image input / output unit 141. The CPU 144 controls the entire image generation unit 130. A peripheral device control unit 146 is connected to the CPU 144. The peripheral device control unit 146 performs interface processing between the CPU 144 and the peripheral device.

  A built-in hard disk drive 147 is connected to the CPU 144 via the peripheral device control unit 146. In addition, a network terminal 148b is connected to the CPU 144 via the peripheral device control unit 146 and the Ethernet circuit 148a. In addition, a USB terminal 149 is connected to the CPU 144 via the peripheral device control unit 146. Further, the SDRAM 151 is connected to the CPU 144 via the peripheral device control unit 146.

  The CPU 144 controls texture coordinates. In other words, the CPU 144 performs processing for texture mapping on the input image data on the polygonal surface on which the GPU 142 draws the resulting image. As described above, the surface of the polygon to be texture-mapped is designated by the target designation unit 171 of the image selection operation unit 170. As described above, the CPU 144 determines whether or not the surface of the polygon has a texture mapping condition, and controls the texture mapping process in the GPU 142 based on the determination result.

  The GPU 142 generates a CG image based on the CG description data held in the hard disk drive 147 or the like, and texture-maps the image onto the designated polygon surface as necessary. The local memory 143 functions as a work area for the GPU 142 and temporarily stores image data of a CG image created by the GPU 142.

  The CPU 144 can access the main memory 145 as well as the local memory 143. Similarly, the GPU 142 can access the local memory 143 and can also access the main memory 145. The CG image data generated by the GPU 142 and temporarily stored in the local memory 143 is sequentially read from the local memory 143 and output from the image input / output unit 141.

  FIG. 6 shows an example of the functional block configuration of the image generation unit 130 described above. The image generation unit 130 includes functional blocks of an image input unit 152, a texture image storage unit 153, a CG control unit 154, a CG drawing unit 155, a texture coordinate control unit 156, a frame buffer 157, and an image output unit 158. .

  The image input unit 152 and the image output unit 158 are configured by an image input / output unit 141. The texture image storage unit 153 includes a main memory 145. Further, the CG control unit 154 and the texture coordinate control unit 156 are configured by the CPU 144. Further, the CG drawing unit 155 is configured by the GPU 142. The frame buffer 157 includes a local memory 143.

  The image input unit 152 and the texture image storage unit 153 are a pair, and by increasing these, the system of image input can be increased. Further, the frame buffer 157 and the image output unit 158 are a pair, and by increasing these, the image output system can be increased.

  The flowchart of FIG. 7 shows the procedure of texture mapping processing during rendering in the image generation unit 130 (including the image mapping unit 140 and the mapping condition check unit 190). Here, an example is shown in which a surface of a polygon on which texture mapping is performed is performed by selecting a material with the target designation unit 171.

  In step ST1, the image generation unit 130 starts processing, and then proceeds to processing in step ST2. In step ST2, the image generation unit 130 finds a polygon to which the selected material is assigned from the CG description data. Thereafter, the image generating unit 130 proceeds to the process of step ST3. In step ST3, the image generation unit 130 determines whether or not the processing of all polygons found in step ST2 has been completed. If not completed, the image generation unit 130 repeats the following processing using the remaining polygons as target polygons sequentially.

  That is, the image generation unit 130 (mapping condition check unit 190) checks the texture mapping condition of the target polygon in step ST4. Then, the image generation unit 130 (mapping condition check unit 190) determines whether or not the surface of the target polygon has a texture mapping condition.

  When determining that the surface of the target polygon has the condition for texture mapping, the image generation unit 130 (image mapping unit 140) performs texture mapping on the surface of the target polygon in step ST6, and then in step ST3. Return to processing. On the other hand, when determining that the surface of the target polygon does not have the texture mapping condition, the image generation unit 130 (image mapping unit 140) immediately determines that the surface of the target polygon is not texture-mapped in step ST7. The process returns to step ST3.

  When the image generation unit 130 determines in step ST3 that all polygons have been processed, the texture mapping process ends in step ST8.

[Judgment of texture mapping condition]
The mapping condition check unit 190 determines that the designated polygon surface does not have a texture mapping condition in the following case.

(1) Undefined Texture Coordinates The mapping condition check unit 190 determines that the mapping condition is not provided when the texture coordinates are not defined on the surface of the polygon designated by the target designating unit 171. This is because if texture mapping is performed on the surface of a polygon whose texture coordinates are undefined, the correspondence with each pixel of the image cannot be calculated, and the display becomes impossible.

  Here, when the target designating unit 171 selects a material and designates a polygon surface to be texture-mapped, if there are a plurality of polygon surfaces to which the material is assigned, a texture coordinate is defined and a definition surface is defined. There may be unfinished surfaces. In this case, whether or not texture coordinates are defined is determined for each surface, and texture mapping is performed only on the surfaces of polygons for which texture coordinates are defined.

  In addition, when the texture coordinate is not defined in the surface of the polygon designated by the target designation | designated part 171, it is possible that the target designation | designated part 171 gives a texture coordinate to the surface of the said polygon, for example. As a result, even if the texture coordinates are undefined on the surface of the designated polygon, the image can be appropriately texture-mapped. When there is no intention or assumption of texture mapping when producing CG description data, and such data material is used to create a higher value-added output image by texture mapping, the texture coordinates are set in this way. Operability improves by providing the function to provide. Reprocessing of the CG description data is not necessary.

  In this case, the target designating unit 171 determines the texture coordinates by projecting the surface of the geometric shape for determining the texture coordinates (plane, cylinder, sphere, etc.) on the designated polygon surface in the computer graphics virtual space. The texture coordinates are given to the specified polygon surface. FIG. 8 shows an example in which texture coordinates are determined by projecting from a plane. In this figure, PG indicates a polygon surface (triangle), and RE indicates a rectangle for texture coordinate projection.

(2) Distortion on Polygon The mapping condition check unit 190 determines that no mapping condition is provided for the texture coordinates of the surface of the polygon designated by the target designation unit 171 if the distortion on the polygon is equal to or greater than a threshold value. To do. Here, the distortion means that the distance is the same in the texture coordinates, but the distance is different depending on the location in the CG space. In this case, since the image is deformed or distorted, it is not suitable for texture mapping.

  FIG. 9 shows an example in which distortion or distortion occurs in an image mapped on a polygon. In this case, the distance La of 0.5 of the texture coordinates in the left polygon (rectangle) and the distance Lb of 0.5 in the texture coordinates of the right polygon (rectangle) are greatly different. Therefore, the image is shrunk on the left side and the image is extended on the right side. For example, the image is unnatural depending on the image to be mapped.

(3) Rotation of polygon surface with respect to Z axis The image mapping unit 140 texture maps a stereo image onto the polygon surface designated by the target designation unit 171. The stereo image provides a stereoscopic effect by making the left-eye image and the right-eye image misaligned to the left and right. When texture mapping stereo images, the left-eye image is rendered as captured by the left-eye virtual camera, and the right-eye image is rendered as captured by the right-eye virtual camera, and texture-mapped. The surface is a stereoscopic image.

  When the image mapping unit 140 texture maps the stereo image onto the polygon plane designated by the target designation unit 171 with respect to the axis (z axis) perpendicular to the screen of the output image, the mapping condition check unit 190 performs texture mapping. If the rotation exceeds the threshold, it is determined that the texture mapping condition is not provided. In this case, the left-right image and the right-eye image are shifted from each other up and down due to the rotation, which makes it difficult to display a stereoscopic image appropriately.

  For example, FIG. 10A shows an example of a stereo image in which the left-eye image IML and the right-eye image IMR are displaced from side to side. In FIG. 10B, the stereo image is rotated 90 degrees with respect to the axis (Z axis) perpendicular to the screen of the output image, and the parallax between the left-eye image IML and the right-eye image IMR is no longer left and right. An example of an image is shown.

  When the polygon plane rotates more than a threshold with respect to the axis (z axis) perpendicular to the screen of the output image in this way, the image mapping unit 140 displays the image for the left eye or the right on the polygon plane. It is conceivable to perform mapping only with an eye image. That is, rendering is performed by capturing the result of mapping the same image on both the left-eye virtual camera and the right-eye virtual camera. In this case, a two-dimensional image is displayed instead of an image having a stereoscopic effect on the surface of the polygon, and it is possible to texture-map the image on this surface.

(4) Rotation of polygon surface with respect to X axis, Y axis, etc. Assume that image mapping unit 140 texture maps a stereo image onto the polygon surface designated by target designation unit 171. The mapping condition check unit 190 determines that the texture mapping condition is not provided when the polygon surface rotates more than a threshold with respect to an axis parallel to the screen of the output image, for example, the x axis or the y axis. . In this case, for example, when rotating around the x-axis, the parallax between the left-eye image and the right-eye image should be reduced, but the parallax between the left-eye image and the right-eye image is not reduced. This is because an unnatural stereoscopic image is displayed.

  For example, FIG. 11A shows an example of a stereo image in which the left-eye image IML and the right-eye image IMR are displaced from side to side. FIG. 11B shows an example in which the stereo image is rotated by θ with respect to the x axis as shown in FIG. 11C. In this case, the depth after rotation is smaller than the original depth due to the parallax between the left-eye image IML and the right-eye image IMR, as shown in FIG. However, the parallax between the left eye image IML and the right eye image IMR is the same as the original state shown in FIG. 11A, as shown in FIG.

  Note that when the polygon surface rotates more than a threshold with respect to an axis parallel to the screen of the output image (x-axis, y-axis, etc.), the image mapping unit 140 causes the left eye It is conceivable to perform mapping only with the image for the right eye or the image for the right eye. In this case, a two-dimensional image is displayed instead of an image having a stereoscopic effect on the surface of the polygon, and it is possible to texture-map the image on this surface.

  In addition, when the polygon surface rotates more than a threshold with respect to an axis (x axis, y axis, etc.) parallel to the screen of the output image, the image mapping unit 140 performs the left eye image and the right eye image. It is conceivable to perform texture mapping by reducing the parallax between images. FIG. 12 shows the relationship between the parallax between the left-eye image and the right-eye image and the depth of the subject. For example, the parallax when the depth is z0 is d0, and when the depth is reduced to z1, the parallax is reduced to d1 accordingly.

  When the polygon plane is rotated by θ with respect to an axis (x axis, y axis, etc.) parallel to the screen of the output image, the depth after rotation with respect to the original depth is as shown in FIG. , Cos θ times. Therefore, the image mapping unit 140 performs texture mapping while reducing the parallax between the left-eye image IML and the right-eye image IMR so that the rotated depth is cos θ times the original depth. Good.

  The flowchart in FIG. 13 illustrates an example of a processing procedure for texture mapping of a stereo image onto a plurality of polygon planes in the image mapping unit 140. In step ST11, the image mapping unit 140 starts processing, and then proceeds to processing in step ST12. In step ST12, the image mapping unit 140 determines whether or not the texture mapping process for all the polygon surfaces has been completed. If not completed, the image mapping unit 140 repeatedly performs the following processing with the remaining polygon planes being sequentially mapped.

  That is, in step ST13, the image mapping unit 140 obtains an inclination θ with respect to an axis parallel to the screen of the output image of the polygon surface to be mapped, for example, the x axis, the y axis, and the like. In step ST14, the image mapping unit 140 reduces the parallax between the left-eye image IML and the right-eye image IMR so as to obtain a depth obtained by multiplying the depth of the stereo image by cos θ (see FIG. 12). Perform texture mapping.

  After the process of step ST14, the image mapping unit 140 returns to step ST12 and repeats the same process as described above. When the image mapping unit 140 determines in step ST12 that the texture mapping process for all the polygon surfaces has been completed, the process ends in step ST15.

  An operation example of the image processing apparatus 100 shown in FIG. 1 will be described. In the CG production unit 110, CG description data for generating a predetermined CG image is generated by the CG production software. The CG description data generated in this way by the CG production unit 110 is sent to the image generation unit 130 via the network 120 and stored in the storage unit 150.

  The image generation unit 130 generates a CG image that is a three-dimensional space image based on the CG description data produced by the CG production unit 110. In addition, the image generation unit 130 performs image mapping so that the image specified by the target specification unit 171 is similarly texture-mapped onto the polygon surface specified by the user selecting an object or material using the target specification unit 171. The mapping unit 140 is controlled.

  The image mapping unit 140 performs texture mapping under the control of the image generation unit 130 described above. In this case, the mapping condition check unit 190 determines whether the polygon surface specified by the target specifying unit 171 has a texture mapping condition. In the image mapping unit 140, texture mapping is performed on the surface of the polygon that is determined to have the texture mapping conditions.

  For example, if texture coordinates are not defined on the polygon surface, it is determined that the conditions for texture mapping are not provided. Further, for example, if the distortion of the polygon surface texture is greater than or equal to a threshold value, it is determined that the mapping condition is not provided. In addition, for example, when a stereo image is texture-mapped on a polygonal surface, the polygonal surface is relative to an axis (z-axis) or a parallel axis (x-axis, y-axis, etc.) that is perpendicular to the screen of the output image. If the rotation exceeds the threshold, it is determined that the texture mapping condition is not provided.

  However, the image mapping unit 140 may perform texture mapping even on a polygonal surface that is determined not to have a texture mapping condition. For example, when texture coordinates are undefined, the target designation unit 171 determines and assigns texture coordinates, and texture mapping is performed. Also, for example, in the case of texture mapping of a stereo image on a polygonal surface, when the polygonal surface rotates more than a threshold with respect to an axis (z axis) perpendicular to the screen of the output image, Texture mapping is performed by using only the image or the right-eye image.

  Also, for example, when a stereo image is texture-mapped on a polygonal surface, and the polygonal surface rotates more than a threshold with respect to an axis parallel to the screen of the output image (x-axis, y-axis, etc.) Texture mapping is performed by using only the image for the left eye or the image for the right eye. Alternatively, in this case, texture mapping is performed by reducing the parallax between the left-eye image IML and the right-eye image IMR.

  Then, to the output terminal 130a derived from the image generation unit 130, image data Vout of a CG image in which an image is texture-mapped on the surface of a predetermined polygon is output. Note that image data of a CG image in which an image is texture-mapped on the surface of a predetermined polygon, which is output from the image generation unit 130, is also input to the input line “10” of the matrix switch 160.

  As described above, in the image processing apparatus 100 shown in FIG. 1, the user designates a polygon surface to be texture-mapped by selecting an object (node) or material using the target designation unit 171 of the image selection unit 170. it can. Accordingly, it is possible to improve the operability and the added value of the video.

  In the image processing apparatus 100 shown in FIG. 1, the mapping condition check unit 190 determines whether the designated polygon surface has a texture mapping condition. Then, in the image mapping unit 140, texture mapping is performed on a polygonal surface having a texture mapping condition.

  Therefore, since the image is not texture-mapped to all the polygon surfaces specified by the target specifying unit 171, the image is texture-mapped only to the polygon surfaces having the texture mapping conditions. It is possible to avoid the image being mapped in an inappropriate state.

<2. Modification>
In the above-described embodiment, when the user selects an object (node) or material using the target specifying unit 171, a polygon surface to be texture-mapped is specified. Then, the mapping condition check unit 190 determines the texture mapping condition for the polygon surface specified in this manner, and the image mapping unit 140 determines the texture mapping condition for the polygon surface determined to have the condition. Mapping is applied. In this case, the user may select an object including a polygonal surface that does not have the texture mapping condition.

  Therefore, the target operation unit 171 may be configured not to receive an operation input for designating a polygon surface that is not determined to have the texture mapping condition by the mapping condition check unit 190. In this case, for example, the target designating unit 171 rejects an operation input designating the surface of the polygon or makes an error. Further, for example, the target designating unit 171 does not display the polygon surface as an option. As a result, it is possible to avoid in advance that the user designates a polygonal surface that does not have a texture mapping condition, and operability can be improved.

  The flowchart of FIG. 14 shows a processing procedure for displaying an object (node) option in the target operation unit 171 in that case. In step ST21, the target designation unit 171 starts processing, and then proceeds to processing in step ST22. In step ST22, the target specifying unit 171 reads the included node name from the CG description data. Thereafter, the target designating unit 171 proceeds to the process of step ST23.

  In step ST23, the target designation 171 determines whether or not the processing of all the nodes read in step ST22 has been completed. When not completed, the target designating unit 171 repeats the following processing by sequentially setting the remaining nodes as target nodes.

  That is, in step ST24, the target designating unit 171 checks the condition of the texture mapping of the polygon surface included in the target node. In step ST <b> 25, the target designating unit 171 determines whether or not all polygon surfaces included in the target node have a texture mapping condition.

  When determining that the texture mapping condition is provided, the target designating unit 171 adds the target node to the option list display in step ST26, and then returns to the process in step ST23. On the other hand, when determining that the conditions for texture mapping are not provided, the target specifying unit 171 immediately returns to the process of step ST23 without adding the target node to the option list display in step ST27.

  When the target designating unit 171 determines in step ST23 that all nodes have been processed, the process ends in step ST28.

  In the above description, the option display of the object (node) has been described. Although the detailed description is omitted, the same applies to the display of material options. There are many polygonal faces in an actual CG, and there is a difficulty in the operation itself of selecting a face for texture mapping from among them. For this reason, for example, when producing CG data, a polygon surface to be texture-mapped is assumed in advance, and texture coordinates are defined only on that surface and are stored in the CG description data. As a result, only an object (node) or material including a polygonal surface can be selected, and the selection operation is easy because the options are limited in selecting the surface to be texture-mapped.

  Although not described above, texture coordinate change designation (affine transformation) and other attributes are stored for each image file or image input (number) to be texture mapped, and can be applied when texture mapping is performed. . Alternatively, for each image file or image input (number) to be texture-mapped, target designation (polygon or material) is stored as an attribute, and by selecting an image, target designation is determined and texture mapping is performed. It is done. In this case, by simply selecting an image to be texture-mapped, texture coordinates and other attributes suitable for the image and the polygon surface are obtained.

[Another configuration example of the image processing apparatus]
FIG. 15 shows a configuration example of another image processing apparatus 100A. In FIG. 15, portions corresponding to those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted as appropriate. The image selection operation unit 170 includes a preview designation unit 175 and a parameter operation unit 176 in addition to the target designation unit 171. The image generation unit 130 has a preview function, and has a preview output terminal 130b in addition to the program output terminal 130a. FIG. 16A shows an example of a program output, and FIG. 16B shows an example of a preview output corresponding thereto.

  When operating on the air in real time and changing the designation of texture mapping, etc., if the operation suddenly affects the on-air image, there is a high possibility that an erroneous image will be broadcast. Therefore, it is necessary to have a mechanism for confirming with a preview before applying to on-air. In the conventional device, there are only two preparations of the same CG image generation device, loading the same CG data in both, using one for live broadcasting, and confirming the operation result image on the other with the monitor output. In order to realize the preview, the operation was complicated, and it was easy to make an error.

  The image generation unit 130 of the image processing apparatus 100A includes a first image output (program output) in which various state parameters including the texture mapping state are first values, and a second image output (preview) in which the second values are second values. Output) at the same time. Thereby, the preview can be realized with certainty.

  In this case, an operation unit that only affects preview output may be provided. Further, animation may be included in the 3D CG data, and the timeline time or Play state (Play speed) may be different between the first image output and the second image output. In addition, a preview alarm unit 195 may be provided that issues an alarm when the parallax of the stereo image of the second image output is inspected and inappropriate. Further, when operating the target designating unit 171, it may be possible to make a transition to a state that only acts on the preview output side.

  A parameter operation unit 176 that inputs a parameter change by a user (operator) to the image generation unit 130 is a jog shuttle dial, a fader lever, a joystick, a trackball, a rotary knob, a push button, various parts of a GUI, and the like. The preview designation unit 175 is a dedicated operation unit that changes the parameter value only on the preview side. Alternatively, an operation mode changeover switch (not shown) is provided so that the same parameter operation unit can be switched between a mode that operates on program output and a mode that operates on preview output. Alternatively, the preview designation unit 175 designates a parameter that acts only on the preview side among the plurality of parameter operation units 176. For example, some of the plurality of knobs can be assigned for the preview side.

  In the case of outputting a stereo image (image signal pair), two virtual cameras for left eye and right eye are arranged at the time of rendering, and images seen by each are calculated and output. Both program output and preview output can be configured to output stereo images. It is possible to adopt a configuration in which parameters (interval and convergence angle) indicating the two relations of the virtual camera can be changed only on the preview side. As a result, whether the result of changing these parameters is appropriate can be confirmed on the preview side before being applied to the program output.

  In addition to stereo images (image signal pairs) as preview output, an anaglyph can also be output. The state of parallax can be confirmed with the naked eye, and it is easy to confirm whether the parallax is excessive. Further, a preview alarm unit can be connected to the preview output. This preview alarm unit is a known technique for generating an alarm by detecting whether or not a viewer of a stereo image is uncomfortable or uncomfortable.

  Further, when the parameter operation 176 includes a Play button, a Stop button, and the like, and the 3D CG data is an animation, the preview designating unit 175 can control Play only for preview output. The following preview functions are available for Play.

(1) LookAhead Preview
Put out the last picture of the animation.
A built-in still image may be attached to the video texture mapping portion.

(2) PausePreview
A picture at a time in the animation is displayed. The specified time you want to see. The time of the representative image.
Specify the operation time of the animation.
Specification support: Since it is desired to specify while looking at the image, for example, a jog operation is performed and a button is operated at a desired location.
In the case of a key frame animation, a GUI may be selected from a list of key frame points.
Default pre-rendering: The default is the middle of the animation interval. The default image may be rendered and retained at the time of import (importing CG description data) without being real-time rendered.

(3) PlayPreview
Play at the specified speed independently on the preview side.
Preview speed: Play speed can be specified.
Either of these previews may be used to allow operation input and setting storage.
The animation of CG data to which the preview function is applied may be animation by physical simulation in addition to key frame animation.

In addition, this technique can also take the following structures.
(1) an image generation unit that generates a computer graphics image based on computer graphics description data;
A target designating unit for receiving an operation input for designating a polygonal surface in the computer graphics description data;
An image mapping unit for texture-mapping a predetermined image on the surface of the polygon designated by the target designation unit;
A mapping condition check unit for determining whether or not the polygon surface specified by the target specifying unit has a texture mapping condition;
The image mapping unit
An image processing apparatus for texture-mapping a predetermined image on a surface of a polygon designated by the target designating unit when the mapping condition checking unit judges that a texture mapping condition is provided.
(2) The image generation unit performs a real-time rendering operation on the frame rate of the output image,
The image mapping unit texture-maps a predetermined image on a surface of a polygon that is determined by the mapping condition check unit to have a texture mapping condition for each frame image generation described in (1). Image processing device.
(3) The target designating part is
The image processing device according to (1) or (2), wherein the mapping condition check unit does not receive an operation input for designating a polygon surface that is not determined to have a texture mapping condition.
(4) The mapping condition check part
The image processing according to any one of (1) to (3), wherein if the texture coordinates are not defined on the surface of the polygon designated by the target designation unit, it is determined that the conditions for texture mapping are not provided. apparatus.
(5) The target designating part
When it is determined that the polygon surface specified by the target specifying unit does not have a texture mapping condition, the surface of the geometric shape for determining texture coordinates in the computer graphics virtual space is set as the specified polygon surface. The image processing apparatus according to (4), wherein the texture coordinates are determined by projecting to the texture, and the texture coordinates are assigned to the surface of the designated polygon.
(6) The mapping condition check part
The texture coordinates of the surface of the polygon specified by the target specifying unit are determined not to have a texture mapping condition if the distortion on the polygon is equal to or greater than a threshold value. (1) to (5) Image processing device.
(7) The mapping condition check part
When the image mapping unit texture-maps a stereo image on the surface of the polygon specified by the target specifying unit,
The image processing according to any one of (1) to (6), wherein when the polygon surface is rotated by a threshold value or more with respect to an axis perpendicular to the screen of the output image, the texture mapping condition is not provided. apparatus.
(8) The image mapping unit
When it is determined by the mapping condition check unit that the polygon surface specified by the target specifying unit does not have a texture mapping condition, texture mapping is performed only with the left eye image or the right eye image. The image processing apparatus according to (7).
(9) The mapping condition check part
When the image mapping unit texture-maps a stereo image on the surface of the polygon specified by the target specifying unit,
If the polygon surface has a rotation greater than or equal to a threshold with respect to an axis parallel to the screen of the output image, it is determined that the texture mapping condition is not provided. Any one of (1) to (8) Image processing apparatus.
(10) The image mapping unit
When it is determined by the mapping condition check unit that the surface of the polygon designated by the target designating unit does not have the condition for the exposure mapping, texture mapping is performed on the left-eye image or the right-eye image. The image processing apparatus according to (9).
(11) The image mapping unit
When it is determined that the polygon surface specified by the target specifying unit does not have a texture mapping condition by the mapping condition check unit, the parallax between the left eye image and the right eye image is reduced. The image processing apparatus according to (9), wherein texture mapping is performed.

DESCRIPTION OF SYMBOLS 100,100A ... Image processing apparatus 110 ... CG production part 120 ... Network 130 ... Image generation part 130a ... Program output terminal 130b ... Preview output terminal 140 ... Image mapping part 150 ... Storage unit 160 ... Matrix switch 170 ... Image selection operation unit 171 ... Target specification unit 175 ... Preview specification unit 176 ... Parameter operation unit 180 ... Image composition unit 190 ... Mapping condition check part 195 ... Preview alarm part

Claims (13)

An image generator for generating a computer graphics image based on the computer graphics description data;
A target designating unit for receiving an operation input for designating a polygonal surface in the computer graphics description data;
An image mapping unit for texture-mapping a predetermined image on the surface of the polygon designated by the target designation unit;
A mapping condition check unit for determining whether or not the polygon surface specified by the target specifying unit has a texture mapping condition;
The image mapping unit
An image processing apparatus for texture-mapping a predetermined image on a surface of a polygon designated by the target designating unit when the mapping condition checking unit judges that a texture mapping condition is provided. The image generation unit performs a real-time rendering operation on the frame rate of the output image,
2. The image according to claim 1, wherein the image mapping unit texture-maps a predetermined image on a surface of a polygon that is determined to have a texture mapping condition by the mapping condition check unit for each frame image generation. 3. Processing equipment. The target specification part
The image processing apparatus according to claim 1, wherein the mapping condition check unit does not receive an operation input for designating a face of a polygon that is not determined to have a texture mapping condition. The above mapping condition check part
The image processing apparatus according to claim 1, wherein when a texture coordinate is not defined on a polygon surface specified by the target specifying unit, it is determined that a condition for texture mapping is not provided. The target specification part
When it is determined that the polygon surface specified by the target specifying unit does not have the texture mapping condition, the surface of the geometric shape for determining texture coordinates is changed to the specified polygon surface in the computer graphics virtual space. The image processing apparatus according to claim 4, wherein the texture coordinates are determined by projecting, and the texture coordinates are assigned to the surface of the designated polygon. The above mapping condition check part
The image processing apparatus according to claim 1, wherein the texture coordinates of the surface of the polygon designated by the target designation unit are determined not to have a texture mapping condition if the distortion on the polygon is equal to or greater than a threshold value. The above mapping condition check part
When the image mapping unit texture-maps a stereo image on the surface of the polygon specified by the target specifying unit,
The image processing apparatus according to claim 1, wherein when the polygon surface is rotated by a threshold value or more with respect to an axis perpendicular to the screen of the output image, it is determined that the texture mapping condition is not provided. The image mapping unit
The texture mapping is performed using only the left-eye image or the right-eye image when the mapping condition check unit determines that the polygon surface designated by the target designation unit does not have a texture mapping condition. Item 8. The image processing device according to Item 7. The above mapping condition check part
When the image mapping unit texture-maps a stereo image on the surface of the polygon specified by the target specifying unit,
The image processing apparatus according to claim 1, wherein when the polygon plane is rotated by a threshold value or more with respect to an axis parallel to the screen of the output image, it is determined that the texture mapping condition is not provided. The image mapping unit
The texture mapping is performed on the left-eye image or the right-eye image when the mapping condition check unit determines that the polygon surface designated by the target designation unit does not have a texture mapping condition. The image processing apparatus according to 9. The image mapping unit
When it is determined that the polygon surface specified by the target specifying unit does not have a texture mapping condition by the mapping condition check unit, the parallax between the left eye image and the right eye image is reduced. The image processing apparatus according to claim 9, wherein texture mapping is performed. An image generation step of generating a computer graphics image based on the computer graphics description data;
An image mapping step for texture-mapping a predetermined image on the surface of the specified polygon;
A mapping condition check step for determining whether or not the surface of the specified polygon has a texture mapping condition;
In the image mapping step,
An image processing method for texture-mapping a predetermined image on the surface of the designated polygon when it is determined that the mapping condition is provided in the mapping condition check step. Computer
Image generating means for generating a computer graphics image based on the computer graphics description data;
Image mapping means for texture mapping a predetermined image on the surface of the specified polygon;
Function as a mapping condition check means for determining whether the surface of the specified polygon has a texture mapping condition,
The image mapping means includes
A program for texture-mapping an image on the specified polygonal surface when the mapping condition checking means determines that the mapping condition is provided.