JP2001222722A - Image display device, image correcting method and recording medium stored with image correction program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To optimally perform image correction processing in accordance with an image characteristics without deteriorating a display image even in the case of displaying a three-dimensional object obtained by mapping a natural image on a part of a surface as the display image. SOLUTION: A texture image paste area storing part stores a texture image paste area being a surface area where a texture image (e.g. natural image) of an image correction object is pasted and correction analysis object data in the area. A texture image display area storing part stores a texture image display area displayed as a display image in the texture image paste area. A correction parameter operating part analyzes the correction object analysis data in the texture image paste area stored in the texture image paste area storing part and calculates an image correction parameter value. An image correcting part uses the image correction parameter value calculated by the correction parameter operating part and corrects the texture image display area stored in the texture image display area storing part in a pixel unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to 3DCG (Dimens
The present invention relates to an image display device that generates and displays a display image by pasting a texture image on a three-dimensional object drawn by ion computer graphics, an image correction method, and a recording medium that stores an image correction program.

[0002]

2. Description of the Related Art In recent years, with the development of three-dimensional computer graphics (3DCG), image display devices have become
A system that generates a 3D scene image including a 3D object drawn by DCG as a display image and displays it on a display screen (display screen) including a window screen has been developed
Has been put to practical use. In such an image display device, the entire pixel data to be displayed on the display screen is analyzed, and an image correction parameter value in the image correction processing is determined to improve the image quality.

[0003] Hereinafter, a conventional image display device will be described with reference to FIG.
This will be specifically described with reference to FIG. FIG. 12 is a block diagram showing a configuration of a conventional image display device. As shown in FIG. 12, in a conventional image display device, a geometry operation unit 101 that performs a predetermined coordinate conversion process on data of a three-dimensional object, and is connected to the geometry operation unit 101 and is subjected to a coordinate conversion process. A display coordinate conversion unit 102 that calculates a scaling value for displaying a dimensional object on a display screen and a texture image storage unit 103 that stores texture images for mapping are provided. The conventional image display device is connected to the display coordinate conversion unit 102 and the texture image storage unit 103, and generates a display image. The display image generation unit 104 is connected to the display image generation unit 104. A correction parameter calculation unit 105 for calculating an image correction parameter value; an image correction unit 106 connected to the display image generation unit 104 and the correction parameter calculation unit 105 for performing a predetermined image correction process on the generated display image; Video memory unit 1 connected to correction unit 106
07. Note that a display (not shown) is connected to the video memory unit 107 to display a display image from the video memory unit 107.

[0004] The geometry calculation unit 101 outputs
The data of the dimensional object is input, and a predetermined coordinate conversion process is performed on the input data. More specifically, the geometry calculation unit 101 inputs, for example, shape data and scenario data of the three-dimensional object in the model coordinate system as data of the three-dimensional object. This shape data is three-dimensional coordinate position information, and specifically, a large number of polygonal polygons constituting the object surface of the three-dimensional object, for example, triangular polygons (hereinafter also referred to as “triangular polygons”). Is a coordinate value indicating the coordinate position of each vertex of the coordinate. The geometry calculation unit 101 converts the input coordinate values of the vertices of the triangular polygon in the model coordinate system into coordinate values in the camera coordinate system via the world coordinate system, and further projects the perspective on the virtual screen. Perform conversion processing. The geometry calculation unit 101 converts the data (coordinate values) of the three-dimensional object subjected to the perspective transformation processing into the display coordinate conversion unit 10.
Output to 2.

The display coordinate conversion unit 102 calculates the above-described scaling value for each coordinate value of the three-dimensional object from the geometry calculation unit 101. The display coordinate conversion unit 102 outputs the coordinate values from the geometry calculation unit 101 and the obtained scaling values to the display image generation unit 104. The texture image storage unit 103 includes a RAM or a similar data storage device, and stores in advance image data of a plurality of types of images to be mapped (pasted) as a texture image. These image data include, in addition to data created by 3DCG, data of natural images including still images and moving images captured by an imaging device such as a camera or a video camera.

The display image generation unit 104 uses the coordinate values subjected to the coordinate conversion processing by the geometry calculation unit 101 and the scaling value from the display coordinate conversion unit 102 to generate a visible three-dimensional object displayed and visually recognized on a display screen. decide. The display image generation unit 104 acquires a texture image to be mapped on at least a part of the surface (polygon) of the determined visible three-dimensional object from the texture images stored in the texture image storage unit 103, and pastes the acquired texture image. wear. Further, the display image generation unit 104 calculates a luminance value of the display screen in pixel units, and generates a display image including the three-dimensional object on which the texture image is pasted. The correction parameter calculation unit 105 analyzes the display image generated by the display image generation unit 104 and determines an image correction parameter value for correcting a luminance value. The image correction unit 106 performs an image correction process on the display image from the display image generation unit 104 using the image correction parameter value from the correction parameter calculation unit 105 to improve the contrast on the display screen. . The video memory unit 107 includes a RAM or a similar data storage device,
At 06, the display image subjected to the image correction processing is stored.

Hereinafter, the operation of the conventional image display device configured as described above will be specifically described. In the conventional image display device, first, the geometry calculation unit 101 performs a predetermined coordinate transformation process on data of an external 3D object, and outputs the data of the 3D object after the perspective transformation process to the display coordinate transformation unit 102. . Next, the display coordinate conversion unit 102
Is used to adjust the coordinate values from the geometry operation unit 101 to the size of the display screen.
Calculates the scaling value for the data of the three-dimensional object after the perspective transformation processing. The display coordinate conversion unit 102 outputs the calculated scaling value and the data of the three-dimensional object from the geometry calculation unit 101 to the display image generation unit 104.

Subsequently, the display image generation unit 104 determines a visible three-dimensional object based on the data of the three-dimensional object from the geometry calculation unit 101 and the scaling value from the display coordinate conversion unit 102, and further determines the texture image. Storage unit 10
3 is pasted on the surface of the determined visible three-dimensional object. After that, the display image generation unit 1
Reference numeral 04 calculates a luminance value for each pixel of the display screen, generates a display image, and outputs the display image to the correction parameter calculation unit 105 and the image correction unit 106. Next, the correction parameter calculation unit 105
Analyzes the display image from the display image generation unit 104,
An image correction parameter value for correcting the luminance value is determined and output to the image correction unit 106.

Subsequently, the image correction unit 106 performs an image correction process on the display image from the display image generation unit 104 using the image correction parameter value input from the correction parameter calculation unit 105, and a video memory unit. Output to 107. Finally, the video memory unit 107 stores the image correction unit 1
The display image subjected to the image correction processing from step 06 is input and stored. As described above, in the conventional image display device, the correction parameter calculation unit 105 analyzes the display image and calculates the image correction parameter value for correcting the luminance value.
Further, in the conventional image display device, the image correction unit 106 performs an image correction process using the above-described image correction parameter value, corrects the luminance value of the display image in pixel units, and improves the contrast on the display screen. I was

[0010]

In the conventional image display apparatus as described above, the correction parameter calculation unit 105 controls the visible 3
The image correction parameter value is calculated by analyzing the display image from the display image generation unit 104 without determining the texture image mapped on the surface of the three-dimensional object. For this reason, in this conventional image display device, the image correction unit 10
The image quality of the display image may be degraded because it is not possible to perform an appropriate image correction process according to the image characteristics on the display image input by the input device 6. Specifically, in the conventional image display device, when displaying a display image including a three-dimensional object in which a natural image is pasted on a part of its surface as a texture image, a three-dimensional object in which the natural image is not pasted is displayed. The same image correction processing as that of the pasted natural image was sometimes performed on other surfaces. As a result, in this conventional image display device, the contrast between the part where the natural image is pasted and the part where the natural image is not pasted becomes inappropriate, and the overall image quality of the display image on the display screen is reduced. . More specifically, for example, when another three-dimensional object to which a natural image is not pasted is partially arranged and displayed in front of the three-dimensional object to which a natural image is pasted, in a conventional image display device, Even on the surface of the three-dimensional object on which the natural image is not pasted, the image correction processing for the natural image is performed, so that the image quality of the display image is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. Even when a three-dimensional object in which a natural image is mapped on a part of its surface is displayed as a display image, the present invention is not limited to this. It is an object of the present invention to provide an image display device, an image correction method, and a recording medium on which an image correction program is recorded, in which an image correction process can be optimally performed according to image characteristics without deteriorating image quality.

[0012]

An image display device according to the present invention inputs data of a three-dimensional object drawn by three-dimensional computer graphics and pastes a texture image on at least a part of the surface of the three-dimensional object. An image display device for generating and displaying a display image attached thereto, a geometry operation unit for converting the three-dimensional object into coordinate position information projected onto a virtual screen, and displaying coordinate position information input from the geometry operation unit A display coordinate conversion unit for calculating a conversion parameter value for converting to display coordinate position information in an image, using the coordinate position information from the geometry calculation unit and the conversion parameter value from the display coordinate conversion unit,
A display image is generated, a texture image pasting area that is a surface area to which a specific texture image is pasted, and correction analysis target data included in the texture image pasting area are calculated in pixel units. A display image generating unit for obtaining a texture image display area displayed as the display image, a texture image storing a texture image pasting region from the display image generating unit and correction analysis target data included in the texture image pasting region A pasting region storage unit, a texture image display region storage unit that stores a texture image display region from the display image generation unit, and a texture image pasting region stored in the texture image pasting region storage unit and correction analysis target data. Parameter to calculate the image correction parameter value. A data calculation unit, and an image correction unit that corrects the texture image display area stored in the texture image display area storage unit on a pixel-by-pixel basis using the image correction parameter value from the correction parameter calculation unit. . With this configuration, even when a three-dimensional object in which a natural image is mapped on a part of its surface is displayed as a display image, the image correction processing can be performed according to the image characteristics without deteriorating the image quality of the display image. Can be performed optimally.

According to another aspect of the present invention, there is provided an image display apparatus comprising:
3 drawn by 3D computer graphics
An image display device for inputting data of a three-dimensional object, pasting a texture image on at least a part of the surface of the three-dimensional object, generating and displaying a display image, and projecting the three-dimensional object onto a virtual screen A geometry calculation unit for converting the coordinate position information into the calculated coordinate position information, a display coordinate conversion unit for calculating a conversion parameter value for converting the coordinate position information input from the geometry calculation unit into display coordinate position information in a display image, and the geometry calculation unit Using the coordinate position information from and the conversion parameter value from the display coordinate conversion unit, to generate a display image, further in the generated display image,
A display image generation unit that obtains a texture image display area in which a specific texture image is displayed as the display image; a texture image display area storage unit that stores a texture image display area from the display image generation unit; The data of the display image, and the data of the specific texture image is input, and the correction analysis target data of the surface area to which the specific texture image is pasted is obtained.
Using a correction parameter calculation unit for calculating an image correction parameter value and an image correction parameter value from the correction parameter calculation unit, the texture image display area stored in the texture image display area storage unit is corrected for each pixel. An image correction unit is provided. With this configuration, even when a three-dimensional object in which a natural image is mapped on a part of its surface is displayed as a display image, the image correction processing can be performed according to the image characteristics without deteriorating the image quality of the display image. Can be performed optimally.

According to the image correction method of the present invention, a display image is generated by inputting data of a three-dimensional object drawn by three-dimensional computer graphics and pasting a texture image on at least a part of the surface of the three-dimensional object. A conversion step for converting the three-dimensional object into coordinate position information projected onto a virtual screen, and displaying the coordinate position information converted in the conversion step on a display image. A calculation step of calculating a conversion parameter value for converting to position information, a generation step of generating a display image using the coordinate position information converted in the conversion step and the conversion parameter value calculated in the calculation step, A text, which is an area on the surface on which a specific texture image is to be pasted, for the display image generated in the generation step. Calculating a correction analysis target data included in the texture image pasting region and the texture image pasting region in pixel units, and further calculating a texture image display region displayed as the display image in the texture image pasting region. A texture image pasting region calculated in the region computing step and a texture image pasting region storing step of storing correction analysis target data included in the texture image pasting region; and a texture image display region obtained in the region computing step. A texture image display area storing step of storing, a correction parameter calculating step of calculating an image correction parameter value using the texture image pasting area and the correction analysis target data stored in the texture image pasting area storing step, and the correction parameter Using the calculated image correction parameter values in the calculation step, a texture image display area stored in the texture image display area storing step and an image correcting step of correcting the pixel unit. With this configuration, even when a three-dimensional object in which a natural image is mapped on a part of its surface is displayed as a display image, the image correction processing can be performed according to the image characteristics without deteriorating the image quality of the display image. Can be performed optimally.

According to another aspect of the present invention, there is provided an image correction method comprising:
3 drawn by 3D computer graphics
An image correction method for inputting data of a three-dimensional object, pasting a texture image on at least a part of the surface of the three-dimensional object to generate and display a display image, and displaying the three-dimensional object on a virtual screen A conversion step of converting the coordinate position information converted in the conversion step into coordinate position information projected in the display step, a calculation step of calculating a conversion parameter value for converting the coordinate position information converted into the display coordinate position information in the display image, and the conversion step. Generating a display image by using the obtained coordinate position information and the conversion parameter value calculated in the calculation step, and a specific texture image is generated for the display image generated in the generation step. Calculating a texture image display area displayed as a texture image table obtained in the area calculating step Based on the texture image display area storing step of storing an area, the data of the display image generated in the generation step, and the data of the specific texture image, correction analysis of the area of the surface on which the specific texture image is pasted A correction parameter calculating step of obtaining target data and calculating an image correction parameter value; and a texture image display stored in the texture image display area storing step using the image correction parameter value calculated in the correction parameter calculating step. An image correction step for correcting the area in pixel units is provided. With this configuration, even when a three-dimensional object in which a natural image is mapped on a part of its surface is displayed as a display image, the image correction processing can be performed according to the image characteristics without deteriorating the image quality of the display image. Can be performed optimally.

A recording medium on which the image correction program of the present invention is recorded converts a three-dimensional object drawn by three-dimensional computer graphics into coordinate position information projected onto a virtual screen, and the converted coordinate position Calculating a conversion parameter value for converting information into display coordinate position information in a display image, using the converted coordinate position information and the calculated conversion parameter value to generate a display image, For the generated display image, a texture image pasting region, which is a surface region to which a specific texture image is pasted, and correction analysis target data included in the texture image pasting region are calculated for each pixel, and the texture Obtaining a texture image display area displayed as the display image from the image pasting area; Storing the calculated texture image pasting area and the correction analysis target data included in the texture image pasting area; storing the obtained texture image display area; and storing the stored texture image pasting area and the correction. Calculating an image correction parameter value using the analysis target data; and correcting the stored texture image display area in pixel units using the calculated image correction parameter value. With this configuration, even when a three-dimensional object in which a natural image is mapped on a part of its surface is displayed as a display image, the image correction processing can be performed according to the image characteristics without deteriorating the image quality of the display image. Can be performed optimally.

According to another aspect of the present invention, there is provided a recording medium storing an image correction program according to the present invention, wherein a three-dimensional object drawn by three-dimensional computer graphics is converted into coordinate position information projected onto a virtual screen. Calculating a conversion parameter value for converting the converted coordinate position information into display coordinate position information on the display image, and generating a display image using the converted coordinate position information and the calculated conversion parameter value. Performing, for the generated display image, obtaining a texture image display area in which a specific texture image is displayed as the display image; storing the obtained texture image display area; The specific texture image is pasted based on the display image data and the specific texture image data. Seeking corrected analysis object data in the region of the attached surface, computing the image correction parameter value,
And using the calculated image correction parameter value to correct the texture image display area stored in the texture image display area storage step on a pixel-by-pixel basis. With this configuration, even when a three-dimensional object in which a natural image is mapped on a part of its surface is displayed as a display image, the image correction processing can be performed according to the image characteristics without deteriorating the image quality of the display image. Can be performed optimally.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an image display device and an image correction method according to the present invention will be described below with reference to the drawings. In the following description, in order to facilitate comparison with the conventional example, the luminance value of a display image is corrected in pixel units as correction analysis target data at the time of image correction processing, and the correction is performed on a display screen. An image display device and an image correction method for improving and displaying contrast will be described by way of example.

Embodiment 1 [Configuration of Image Display Apparatus] FIG. 1 is a block diagram showing the configuration of an image display apparatus according to Embodiment 1 of the present invention. FIG. 2 is an explanatory diagram showing a specific example of the three-dimensional object displayed on the image display device shown in FIG. 1. FIG. 3 shows the three-dimensional object shown in FIG. 2 generated as a display image and displayed on a display screen. FIG. 14 is an explanatory diagram illustrating a display example. As shown in FIG. 1, the image display device according to the first embodiment performs a predetermined coordinate conversion process on data of a three-dimensional object, and converts the data into coordinate position information projected on a virtual screen. A display coordinate conversion unit 2 is connected to the geometry calculation unit 1 and calculates a conversion parameter value for displaying a three-dimensional object subjected to coordinate conversion processing on a display screen. The image display device according to the first embodiment is connected to the texture image storage unit 3 for storing a texture image for mapping, and the display coordinate conversion unit 2 and the texture image storage unit 3 to generate a display image. A display image generation unit 4 is provided.

The image display apparatus according to the first embodiment calculates the luminance value of each pixel included in the texture image pasting area (hereinafter referred to as "texture image pasting area") on the surface on which a specific texture image is pasted. The texture image pasting area storage unit 5 input and stored from the display image generation unit 4 and the area of the texture image displayed as the surface of the display image among the texture image pasting areas (hereinafter, “texture image display area”) ) Is input from the display image generation unit 4 and stored. The image display device according to the first embodiment further includes a correction parameter calculation unit 7 that calculates an image correction parameter value for performing a predetermined image correction process on the display image generated by the display image generation unit 4. Image correction unit 8 connected to display image generation unit 4, texture image display area storage unit 6, and correction parameter calculation unit 7.
And a video memory unit 9 connected to the image correction unit 8. Here, the specific texture image is image data such as a natural image other than 3DCG, is specified by an image ID described later, and is pasted on an image correction target area where the image correction unit 8 performs image correction processing. This is the texture image obtained.

The geometry calculation unit 1 receives shape data and scenario data of a three-dimensional object, and performs a predetermined coordinate conversion process on the input data. Specifically, the geometry calculation unit 1 inputs, as shape data of the three-dimensional object, for example, three-dimensional coordinate position information in a model coordinate system for defining data of each three-dimensional object. The three-dimensional coordinate position information indicates the coordinate position of each vertex of a large number of polygonal polygons constituting the object surface of the three-dimensional object, for example, triangular polygons (hereinafter, also referred to as “triangular polygons”). It is a coordinate value. The geometry calculation unit 1 converts the input coordinate values of the vertices of the triangular polygon in the model coordinate system into a world coordinate system (Science, “Basics and Application of 3D CG”, 60
Page), the coordinates are converted to coordinate values in a coordinate system centered on the viewpoint, and a perspective transformation process is performed. Geometry operation unit 1
Outputs the coordinate position information (coordinate values) subjected to the perspective transformation processing to the display coordinate conversion unit 2.

More specifically, the geometry calculation unit 1
As shown in FIG. 2, for example, each three-dimensional coordinate position information (coordinate value) of the three-dimensional objects 41 and 43 in the model coordinate system is input, and each of the three-dimensional objects 41 and 43 is converted into the world coordinate system 40 based on the scenario data. To place. Further, the geometry calculation unit 1 converts the coordinates into coordinate values in the camera coordinate system 44 shown in FIG. That is, the geometry calculation unit 1 uses the camera coordinate system 4 with the viewpoint of the camera as the origin and the posture of the camera as the coordinate axis.
The coordinates are converted into the three-dimensional coordinate position information in step 4, and the coordinate values after the perspective transformation processing projected from the origin in the imaging direction indicated by the hatched portion of the triangle in FIG. In the perspective transformation processing, each coordinate value is normalized to a value in a range of 0 to 1.

The data of the three-dimensional object input by the geometry calculation unit 1 includes, as information for each surface of the three-dimensional object, IDs (identifiers) of polygons constituting the surface,
The luminance value at each vertex of the polygon and instruction information for instructing whether to paste a specific texture image for each polygon are included. The instruction information includes an image ID for specifying and specifying a texture image to be pasted, and a position for indicating a pixel unit position in the texture image, and associating the luminance value of the texture image at the position with a vertex of the polygon. Contains texture coordinate values. The three-dimensional objects 41 and 43 are converted, generated, and displayed as, for example, a display image in a display screen shown in FIG. 3 by the subsequent display coordinate conversion unit 2 and display image generation unit 4. 2 and FIG. 3, the portions indicated by oblique lines are 3
This is a portion of the surface 42 of the three-dimensional object 41 on which a natural image is pasted and displayed.

Returning to FIG. 1, the display coordinate conversion section 2 calculates a conversion parameter value for converting each coordinate position information (coordinate value) of the perspective-transformed vertex to a display screen, and calculates the calculated conversion parameter value. And the coordinate values from the geometry calculation unit 1 are output to the display image generation unit 4. Here, the conversion parameter value is a scaling value for adjusting the size of the three-dimensional scene image including the three-dimensional object determined by the geometry calculation unit 1 to the size of the display screen. Further, the display screen (display screen) includes not only the entire surface of the display for displaying the display image but also a window screen in which the entire surface is divided in the vertical and horizontal directions. The size of the window screen is specified by the number of pixels in the vertical and horizontal directions of the display screen according to an external instruction. The texture image storage unit 3 is configured by a RAM or a similar data recording device, and stores in advance image data of a plurality of types of images to be mapped (pasted) as a texture image. The texture image storage unit 3 stores the image ID and the accumulated texture image in association with each other. These image data include, in addition to data created by 3DCG, data of natural images including still images and moving images captured by an imaging device such as a camera or a video camera.

The display image generator 4 determines whether or not each polygon is displayed on the display screen, and performs a hidden surface erasing process for erasing the hidden surface of each three-dimensional object. The display image generation unit 4 converts the coordinate position information calculated by the geometry calculation unit 1 into display coordinate values in the display image coordinate system on the display screen using the conversion parameter values from the display coordinate conversion unit 2.
Specifically, for example, the display image generation unit 4 obtains a normal line for each polygon, and calculates an inner product of the normal line and a forward vector of the camera (a vector in the image capturing direction of the camera). If the calculated inner product is a negative value, the display image generation unit 4 determines that the polygon is oriented in a direction not displayed on the display screen, and stops the subsequent data processing. If the calculated inner product is a positive value, the display image generation unit 4 determines that the polygon is oriented in a direction in which the polygon is displayed (visually recognized) on the display screen, and performs a rendering process of the polygon.

More specifically, the display image generation unit 4 obtains each luminance value at the vertex corresponding to the converted display coordinate value from the data input by the geometry calculation unit 1, and obtains the luminance value in the display image coordinate system. The area of the display image corresponding to the polygon is determined. Further, the display image generation unit 4 calculates the luminance values of the pixels on the display screen other than the converted display coordinate values, that is, the luminance values of the pixels other than the vertices of the polygon by performing a linear interpolation process. As a result, in the polygon displayed on the display screen, the inside of the polygon is filled and drawn according to the luminance value of the vertex. Further, for the polygon on the surface on which the texture image specified by the image ID is to be pasted, the luminance value is determined for each pixel not only based on external data but also based on the luminance value of the texture image to be pasted (details will be described later). ). In the hidden surface removal processing described above, the display image generation unit 4
For example, depth information from the viewpoint of the display screen (hereinafter, “Z”)
A value ")" is stored for each pixel, and a Z-buffer method (depth buffer method) for comparing Z values at the same pixel position is used. For example, as shown in FIG. 3, even when the three-dimensional object 43 is arranged and displayed in front of the three-dimensional object 41, the part of the three-dimensional object 41 located behind the three-dimensional object 43 is erased and displayed. The Z value is stored in a Z buffer (not shown).

Referring now to FIG. 4, the drawing process for filling the inside of a triangular polygon in the display image generating unit 4 will be specifically described. FIG. 4 is an explanatory diagram showing a method of drawing one triangular polygon in the display image generating unit shown in FIG. As shown in FIG. 4, in the process of drawing a triangular polygon consisting of vertices IP1, IP2, and IP3, the display image generation unit 4
Obtains, for example, the maximum value y1 and the minimum value y3 of the Y coordinate, and obtains the brightness values, texture coordinate values, and Z values of the obtained vertices IP1 and IP3. The display image generation unit 4 determines, based on the acquired luminance value, texture coordinate value, and Z value, one pixel at a time in the Y-axis direction from the maximum value y1 to the minimum value y3, and X included in the triangular polygon. The luminance value, texture coordinate value, and Z value of each pixel in the axial direction are calculated by performing linear interpolation processing.

More specifically, the display image generation unit 4 calculates the luminance values, texture coordinate values, and Z values of the vertices IP1 and IP3.
Based on the values, a luminance value, a texture coordinate value, and a Z value at a point Ii on one side of a triangular polygon connecting these vertices IP1 and IP3 are obtained by linear interpolation processing. Similarly, the display image generation unit 4 determines, based on each luminance value, texture coordinate value, and Z value of the vertices IP1 and IP2, at a point Ik on one side of a triangular polygon connecting these vertices IP1 and IP2. The luminance value, the texture coordinate value, and the Z value are obtained by linear interpolation processing. The display image generation unit 4 corresponds to pixels of the display screen on a straight line parallel to the X axis passing through the points Ii and Ik, based on the brightness values, texture coordinate values, and Z values of the points Ii and Ik. The luminance value, texture coordinate value, and Z value at the point are obtained by linear interpolation processing. Note that the points Ii and Ik are points corresponding to pixels of the display screen located on the sides of the triangular polygon. Further, the display image generation unit 4 obtains a luminance value, a texture coordinate value, and a Z value at a point on one side of the triangular polygon connecting the vertices IP2 and IP3, and determines the point on the one side and the point Ii. A luminance value at a point corresponding to a pixel of the display screen on a straight line parallel to the X axis passing through,
The texture coordinate value and the Z value are respectively obtained by linear interpolation processing. When the texture image is not pasted, the display image generation unit 4 performs the above-described drawing processing of the triangular polygon without obtaining the texture coordinate value.

Returning to FIG. 1, when the display image generation unit 4 pastes a specific texture image specified by an external image ID on the surface, the display image generation unit 4 uses the display image coordinate system of the surface. Area, that is, the texture image pasting area, and the texture image pasting area storage unit 5
Then, an area in the display image coordinate system that is actually displayed on the display screen, that is, a texture image display area is obtained and output to the texture image display area storage unit 6. Specifically, the display image generation unit 4 outputs the entire region of the surface 42 including the portion hidden by the three-dimensional object 43 and not appearing on the display screen as a texture image pasting region, for example, as illustrated in FIG. An area (shown by a hatched portion in FIG. 3) of the surface 42 appearing on the display screen is output as a texture image display area. Furthermore, when a specific texture image is pasted on the surface, the display image generation unit 4 associates the luminance value at the vertex converted into the display coordinate value with the value included in the external data by the texture coordinate value. It is obtained by multiplying the value at the pixel position in the texture image by the product. Also, regarding the luminance value at the pixel other than the vertex,
For example, as described with reference to FIG. 4, it is obtained by performing a linear interpolation process. The display image generation unit 4 outputs the obtained luminance value to the texture image pasting area storage unit 5.

The texture image pasting area storage unit 5 stores R
It is configured by an AM or similar data recording device, and stores the texture image pasting area from the display image generation unit 4 and the luminance value of each pixel of the display screen included in the area. Specifically, the texture image pasting area storage unit 5
As the texture image pasting area, the ID of the surface on which the texture image is to be pasted and the position of each pixel on the display screen including the display coordinate values corresponding to the vertices of the polygons constituting the surface are stored. The texture image display area storage unit 6 is configured by a RAM or a similar data recording device, and stores the texture image display area from the display image generation unit 4. In detail, the texture image display area storage unit 6 pastes the texture image and displays the display ID including the ID of the surface displayed on the display screen and the display coordinate values corresponding to the vertices of the polygons constituting the surface. And each pixel position is stored.

The correction parameter calculation unit 7 performs image analysis using the texture image pasting area and the luminance value input from the texture image pasting area storage unit 5, and calculates an image correction parameter value based on the result of the image analysis. . More specifically, the correction parameter calculation unit 7 calculates the maximum value Imax, the minimum value Imin, and the average value Iav of the luminance values in the texture image pasting region as predetermined luminance characteristic values in the region. The calculated maximum value Imax and minimum value Im
The ratio of the difference value between in and the desired contrast value Icon set in advance is calculated as a gain value G (= (Imax-Imin) ÷ Ic
on). Further, the correction parameter calculation unit 7
Is the calculated gain value G, maximum value Imax and minimum value Imin
Then, it is determined whether or not the luminance value after the image correction processing falls within the range between the maximum luminance value and the minimum luminance value of the display screen. When the luminance value after the image correction processing does not fall within the above range, the correction parameter calculation unit 7 sets the luminance value after the image correction processing so as not to exceed the maximum luminance value and to fall within the minimum luminance value. , And calculates the offset value Ioff based on the obtained average value Iav. The correction parameter calculation unit 7 obtains the above-described gain value G and offset value Ioff for each texture image pasting area, and outputs them to the image correction unit 8 as image correction parameter values.

The image correction section 8 includes a correction parameter calculation section 7
The luminance value of each pixel of the display screen specified by the texture image display area from the texture image display area storage unit 6 is corrected using the image correction parameter value from. More specifically, the image correction unit 8 uses the gain value G and the offset value Ioff calculated by the correction parameter calculation unit 7 to calculate the pixels included in the texture image display area according to the following equation (1). Is corrected, and the luminance value Ipix ′ after the image correction processing is obtained for each pixel.

Ipix ′ = (Ipix−Iav) × G + (Iav + Ioff) — (1)

The video memory unit 9 is composed of a RAM or a similar data recording device, and stores data of a display image subjected to image correction processing from the image correction unit 8. A display (not shown) is connected to the video memory unit 9 to display a display image from the video memory unit 9.

[Operation of Image Display Apparatus] The first embodiment will be described below.
The operation of the image display device will be specifically described. still,
In the following description, a case where a three-dimensional scene image including the three-dimensional objects 41 and 43 shown in FIG. 3 is generated and displayed as a display image will be described as an example. Further, a case will be described in which image correction processing is performed on a texture image (natural image) pasted on the surface 42 in FIG. In the image display device according to the first embodiment, first, the geometry calculation unit 1 performs a predetermined coordinate conversion process on each data of the three-dimensional objects 41 and 43 from outside. Thereby, the coordinate values of each vertex of the plurality of triangular polygons forming the surfaces of the three-dimensional objects 41 and 43 are converted into data subjected to the perspective transformation processing and output to the display coordinate transformation unit 2. . Next, the display coordinate conversion unit 2 displays each coordinate value from the geometry calculation unit 1 in order to adjust the display image including the three-dimensional objects 41 and 43 processed by the geometry calculation unit 1 to the size of the display screen. A conversion parameter value for calculating a display coordinate value in the image coordinate system is obtained and output to the display image generation unit 4. Subsequently, the display image generation unit 4 converts the coordinate values obtained by the geometry calculation unit 1 into display coordinate values using the corresponding conversion parameter values from the display coordinate conversion unit 2, and pastes the texture image on the surface. A drawing process including a mapping process and a hidden surface erasing process is performed.

Here, referring to FIG. 5, the display image generation unit 4
The operation of will be described specifically. FIG. 5 is a flowchart showing the operation of the display image generation unit shown in FIG.
In FIG. 5, first, the display image generation unit 4 obtains a luminance value and a Z value at each vertex of a polygon constituting each of the three-dimensional objects 41 and 43 from the data from the geometry calculation unit 1.
Thereafter, the display image generation unit 4 performs a linear interpolation process on the luminance value and the Z value at the pixel (pixel position) of the display screen included in the polygon using the acquired luminance value and the Z value at the vertex. Ask by At this time, for the surface on which the texture image is to be pasted, for example, the front surface 42, the display image generation unit 4 determines not only the luminance value and the Z value but also the front surface 4
The texture coordinate values corresponding to the vertices of the polygons constituting 2 are also acquired. Then, based on the acquired luminance value, Z value, and texture coordinate value at the vertex, the display image generating unit 4 performs the linear interpolation processing on the luminance value, the Z value, and the texture coordinate value at the above-described pixel position, respectively. It is determined (step S1).

Next, the display image generation unit 4 uses the texture coordinate values obtained in step S1 for the polygons on the surface 42, and calculates the luminance value of the texture image to be pasted on the surface using the texture image storage unit 3. From the pixel unit. Then, the display image generation unit 4 obtains a product of the obtained luminance value of the texture image and the luminance value obtained in step S1 on a pixel-by-pixel basis, and calculates the luminance value after pasting the texture image ( Step S2). As a result, the luminance value of each pixel on the display screen is determined, and a display image before the image correction processing is generated. Subsequently, the display image generation unit 4 determines whether or not the determined luminance value is included in the surface on which the texture image specified as the image correction target is pasted (step S3). If the luminance value is not included in the pasted surface, the process proceeds to step S5 described below.

On the other hand, when the luminance value is included in the pasted surface, the display image generating unit 4 determines that the luminance value is included in the texture image pasting area, and determines the luminance value. The ID of the polygon including the pixel, the pixel position on the display screen, and the value of the brightness value are output to the texture image pasting area storage unit 5 (step S).
4). Thereby, the texture image pasting area storage unit 5
Stores the pixel positions on the display screen including the IDs of all the polygons constituting the surface 42 and the display coordinate values corresponding to the vertices of the polygons as a texture image pasting area,
Further, a luminance value at a pixel included in the texture image pasting area is stored.

Next, the display image generator 4 determines whether or not the image is displayed on the display screen based on the Z value.
Specifically, the display image generation unit 4 compares the Z value stored and set in the Z buffer for each pixel with the Z value of the display image obtained this time (step S5). When the obtained Z value is large, the display image generation unit 4 determines that the image is not displayed on the display screen, and ends the process. If the calculated Z value is small, the display image generation unit 4 updates and overwrites the value in the Z buffer at the corresponding pixel position (step S6). Subsequently, the display image generation unit 4 determines whether or not the luminance value at the pixel position where the Z value has been updated is included in the surface on which the texture image specified as the image correction target is pasted (step S7). If the luminance value is not included in the pasted surface, the display image generation unit 4 determines that the pixel having the luminance value is included in an area where image correction processing does not need to be performed, and performs the processing. finish. On the other hand, when the luminance value is included in the pasted surface, the display image generation unit 4 determines that the luminance value is included in the texture image display area, and determines whether the polygon including the pixel having the luminance value is included. The ID and the pixel position on the display screen are output to the texture image display area storage unit 6 (step S8). As a result, the texture image display area storage unit 6 stores the polygon IDs of the polygons constituting the surface 42 excluding the part that does not overlap with the three-dimensional object 43 and is not displayed on the display screen corresponding to each vertex of the polygons. The pixel position is stored as a texture image display area.

Subsequently, the correction parameter calculation unit 7 inputs the texture image pasting area from the texture image pasting area storage unit 5 and the luminance values of the pixels included in the area. Then, the correction parameter calculation unit 7 calculates an image correction parameter value in the texture image pasting area based on the input luminance value. Specifically, the correction parameter calculation unit 7 obtains the maximum value, the minimum value, and the average value of the luminance values included in the surface 42, and further calculates the difference between the maximum value and the minimum value. After that, the correction parameter calculation unit 7 obtains a ratio between the calculated difference value and a preset desired contrast value as a gain value for the luminance value in the image correction processing. Further, the correction parameter calculation unit 7 determines, based on the obtained gain value and the maximum and minimum luminance values of the surface 42, the luminance value after the image correction processing in the range of the maximum luminance value and the minimum luminance value of the display screen. Ask if it fits in. When the luminance value after the image correction processing does not fall within the above range, the correction parameter calculation unit 7
An offset value based on the average value is calculated so that the luminance value after the image correction processing does not exceed the maximum luminance value and falls within the minimum luminance value. Then, the correction parameter calculation unit 7 outputs the obtained gain value and offset value to the image correction unit 8 as image correction parameter values on the front surface 42.

Next, the image correction unit 8 calculates the gain value, offset value,
Then, the luminance value of each pixel in the texture image display area stored in the texture image display area storage unit 6 is corrected. Specifically, the luminance value of the portion displayed on the display screen of the surface 42 on which the texture image is pasted is corrected, and a display image having a desired contrast is generated. Then, the image correction unit 8 outputs the display image subjected to the image correction processing to the video memory unit 9. Lastly, the video memory unit 9 holds the data of the display image output from the image correction unit 8.

As described above, in the image display device and the image correction method according to the first embodiment, the texture image pasting area storage unit 5 stores the texture image pasting area to which the texture image (for example, a natural image) to be corrected is pasted. The luminance value in the area is stored. The texture image display area storage unit 6 stores a texture image display area displayed on the display screen among the texture image pasting areas. The correction parameter calculation unit 7 analyzes the luminance value in the texture image pasting area stored in the texture image pasting area storage unit 5 to obtain an image correction parameter value. The image correction unit 8 corrects the luminance value in the texture image display area stored in the texture image display area storage unit 6 on a pixel-by-pixel basis using the correction parameter value calculated by the correction parameter calculation unit 7. . As a result, in the image display device and the image correction method according to the first embodiment, a desired image correction process can be performed on a portion of the surface on which the texture image to be corrected is pasted, which is actually displayed on the display screen. it can. As a result, in the image display device and the image correction method according to the first embodiment, even when a three-dimensional object in which a natural image is mapped on a part of the surface is displayed as a display image, the image quality of the display image does not deteriorate. The image correction processing can be optimally performed according to the image characteristics.

Embodiment 2 [Structure of Image Display Apparatus] FIG. 6 is a block diagram showing the structure of an image display apparatus according to Embodiment 2 of the present invention. In this embodiment, in the configuration of the image display device, the correction parameter calculation unit is configured to calculate an image correction parameter value based on the size of the above-described texture image display area, and the calculated image correction parameter value is used. The image correction unit is configured to perform the image correction processing on the display image. The other parts are the same as those of the first embodiment, and the duplicate description thereof will be omitted. As shown in FIG.
In the image display device, the first switch 27 is connected between the texture image pasting area storage unit 5 and the correction parameter calculation unit 7, and the second switch 28 is connected to the display image generation unit 4
And the image correction unit 29 and the video memory unit 9. The first and second switches 27 and 28 perform a switching operation according to the size of the texture image display area from the texture image display area storage unit 26.

More specifically, in the image display device according to the second embodiment, the texture image display area storage section 26 stores the texture image display area input from the display image generation section 4 and stores the stored texture image display area. The magnitude is output to the first and second switches 27 and 28. A specific example of the size of the texture image display area includes, for example, the number of pixels on the display screen. Texture image display area storage unit 26
Outputs the stored texture image display area to the image correction unit 29. Specifically, the texture image display area storage unit 26 outputs a pixel position on the display screen included in the texture image display area to the image correction unit 29. The first switch 27 compares the size of the texture image display area from the texture image display area storage unit 26 with a preset specified value, and determines that the size of the texture image display area is equal to or larger than the specified value. The first switch 27 connects the texture image pasting area storage unit 5 to the correction parameter calculation unit 7. As a result, the correction parameter calculation unit 7 calculates and calculates an image correction parameter value for correcting the specific texture image only when the texture image display area is larger than a predetermined value. Similarly, the second
The switch 28 of the texture image display area storage unit 26
Then, the size of the texture image display area is compared with a preset predetermined value. When the size of the texture image display area is equal to or larger than the specified value, the second switch 28 connects the display image generation unit 4 to the image correction unit 29. When the size of the texture image display area is smaller than the specified value, the second switch 28 connects the display image generator 4 to the video memory 9. Thus, the image correction process is performed on the specific texture image only when the size is equal to or larger than the predetermined size on the display screen.

The image correction unit 29 determines the texture image display area from the texture image display area
Using the image correction parameter value from the correction parameter calculation unit 7, the image correction processing is performed on the data of the display image from the display image generation unit 4. More specifically, when the number of pixels V1 is set in advance as a specified value in the first and second switches 27 and 28, the image correction unit 29 determines the number of pixels V2 used for calculating the image correction parameter value and the number of pixels V2. Of the difference between the number of pixels V3 to be image-corrected and the number of pixels V1 when the value of the difference is 1
(= (V3-V1) / (V2-V1)) is calculated. Using the calculated ratio α and the gain value G and the offset value Ioff from the correction parameter calculation unit 7, the image correction unit 29 corrects the luminance value in pixel units by the following equation (1) ′.

Ipix ′ = (Ipix−Iav) × ((G−1) × α + 1) + Iav + Ioff × α (1) ′

The above-mentioned pixel number V2 is the number of pixels on the display screen included in the texture image pasting area, that is, the total number of image-analyzed pixels. 7, and is input to the image correction unit 29. The number of pixels V3 is the number of pixels on the display screen included in the texture image display area, and is input from the texture image display area storage unit 26 to the image correction unit 29. The maximum value that the number of pixels V3 can take is the number of pixels V2.

[Operation of Image Display Apparatus] The second embodiment will be described below.
The operation of the image display device will be specifically described with reference to FIGS. FIG. 7 is an explanatory diagram showing another display example in which the three-dimensional object shown in FIG. 2 is generated as a display image and displayed on a display screen. In the following description, operations different from those of the first embodiment will be mainly described. In the image display device according to the second embodiment, the texture image display area storage unit 26 stores the three-dimensional object 4
The ID of the polygon excluding the portion that does not overlap with 3 and the pixel position on the display screen including the display coordinate value corresponding to each vertex of the polygon are input as a texture image display area from the display image generation unit 4 and stored. Then, the texture image display area storage unit 26 sets the number of pixels V3 included in the stored texture image display area as the size of the texture image display area and the first and second switches 27,
28.

Next, the first and second switches 27 and 28
Then, a comparison is made between the input number of pixels V3 and the preset number of pixels V1 having a specified value. The number of pixels V3 is the number of pixels V1
In the case described above, the first switch 27 connects the texture image pasting area storage unit 5 to the correction parameter calculation unit 7,
The second switch 28 switches the display image generation unit 4 to the image correction unit 2.
Connect to 9. As a result, the texture image pasting area storage unit 5 corrects the stored texture image pasting area and the luminance value of each pixel included in the stored area via the first switch 27, as in the first embodiment. Output to the parameter calculation unit 7. Then, the correction parameter calculator 7 calculates
An image correction parameter value for the texture image is calculated, and the calculated image correction parameter value and the number of pixels V2 in the calculation are output to the image correction unit 29. The data of the display image generated by the display image generation unit 4 is output to the image correction unit 29 via the second switch 28. Subsequently, the image correction unit 29 weights the image correction parameter value according to the size of the texture image display area, and then corrects the luminance value of each pixel in the texture image display area. Specifically, the image correction unit 29 sets the difference (V2−V1) between the number of pixels to 1 (V−V1).
3-V1), and multiplies the gain value and the offset value included in the image correction parameter value. Then, the image correction unit 29 corrects the luminance value of each pixel included in the texture image display area by using the above equation (1) ′, and includes the corrected luminance value in the display image data subjected to the image correction processing. 9 is output.

On the other hand, when the number of pixels V3 is smaller than the number of pixels V1, the first switch 27 does not connect the texture image pasting area storage section 5 to the correction parameter calculation section 7, and the second switch 28 sets the display image generation section. 4 is connected to the video memory unit 9. Thus, the data of the display image generated by the display image generation unit 4 is output to the video memory unit 9 without being subjected to the image correction processing by the image correction unit 29 and stored. That is, in the image display device of the second embodiment, when the portion actually displayed on the display screen is small, for example, as in the display image shown in FIG. The image correction processing can be omitted by determining that the influence of the image quality deterioration due to the image can be almost ignored. As a result, in the image display device of the second embodiment, depending on the size of the texture image display area,
The time required for data processing can be reduced.

As described above, in the image display device and the image correction method according to the second embodiment, the texture image display area storage unit 26 stores the size of the specific texture image input from the display image generation unit 4 into the first and second image sizes. 2 switches 27 and 28. The first switch 27 connects the texture image pasting area storage unit 5 and the correction parameter calculation unit 7 when the size of the texture image display area is equal to or greater than a predetermined value. If the size of the texture image display area is equal to or larger than a predetermined value, the second
Switch 28 connects the display image generation unit 4 and the image correction unit 29, and when the size of the texture image display area is smaller than a preset specified value, the second switch 28 The video memory unit 9 is connected.
Accordingly, in the image display device and the image correction method according to the second embodiment, in addition to the effects of the first embodiment, a specific texture image is pasted according to an area where the specific texture image is displayed on the display screen. It is possible to determine whether or not to perform image correction processing on the displayed image. As a result, in the image display device and the image correction method according to the second embodiment, when a specific texture image occupies a small portion on the display screen, the image correction process can be omitted. The time required for data processing can be reduced.

Third Embodiment [Configuration of Image Display Apparatus] FIG. 8 is a block diagram showing a configuration of an image display apparatus according to a third embodiment of the present invention. In this embodiment, in the configuration of the image display device, the correction parameter calculation unit inputs the data of the display image from the display image generation unit and the data of the specific texture image to be pasted, and pastes the specific texture image. The correction analysis target data (brightness value) of the surface area is calculated, and the image correction parameter value is calculated. The other parts are the same as those of the first embodiment, and the duplicate description thereof will be omitted. As shown in FIG. 8, in the image display device according to the third embodiment, the display image generation unit 32 and the texture image storage unit 33 are connected to the correction parameter calculation unit 31. Thus, in the image display device of the third embodiment, unlike the above-described embodiment, the correction parameter calculator 31 calculates the brightness of each vertex of the polygon facing the camera (displayed) from the display image generator 32. Based on the value, the texture coordinate value, and the display coordinate value, the maximum value, the minimum value, and the average value of the luminance value of the texture image pasting area on the display screen can be estimated. Therefore, in the image display device according to the third embodiment, the luminance value in the texture image display area actually displayed can be corrected for each pixel without providing the texture image pasting area storage unit.

More specifically, in the image display apparatus according to the third embodiment, the display image generation unit 32 determines whether or not each polygon is displayed on the display screen, and performs the hidden surface removal processing of each three-dimensional object. Do. The display image generation unit 32 generates a polygon i (i is a natural number) facing a direction displayed on a display screen among polygons forming a surface on which a specific texture image (for example, a natural image) is pasted. The predetermined data is output to the correction parameter calculator 31. Further, the display image generation unit 32 obtains a texture image display area by, for example, a Z-buffer method using a Z value, and outputs the texture image display area to the texture image display area storage unit 6. As with the polygon included in the texture image pasting area in the above embodiment, each of the Z values of the pixels on the display screen included in the polygon i is output to the polygon i output to the correction parameter calculating unit 31 described above. Z
A value larger than another Z value at the same pixel position set in the buffer is also included.

The display image generation unit 32 determines the luminance value of each pixel on the display screen, generates data of a display image, and outputs the data to the image correction unit 34, similarly to the above embodiment. Further, the display image generation unit 32 according to the third embodiment determines the brightness value, the texture coordinate value, and the display coordinate value of the polygon i before multiplying the brightness value in the texture image acquired by the texture coordinate value. The data is output to the correction parameter calculator 31 as data. Thereby, as described in detail later, the correction parameter calculator 31 calculates the maximum value Imax ′, the minimum value Imin ′, and the average value of the region where the surface on which the specific texture image is to be attached faces the camera direction. The value Iav 'is calculated. The maximum value Imax 'of the luminance value
And the minimum value Imin ′ is obtained by multiplying, for each vertex of all the polygons output from the display image generation unit 32, the luminance value and the luminance value of the texture image obtained by the texture coordinate value, in the display image. The maximum and minimum values. The average value Iav ′ is based on the luminance value of each vertex, the area of each polygon in the display image, and the area of the area of the texture image pasted on the polygon, as described in (2) below.
This is a value estimated using the equation.

The correction parameter calculating section 31 holds predetermined data of the polygon i constituting the surface on which a specific texture image is to be pasted, among the data of the display image output from the display image generating section 32. The correction parameter calculation unit 31 obtains the maximum value and the minimum value of the luminance value of the vertex of the polygon i based on the held predetermined data, and obtains the average value Iav (PSi). Further, the correction parameter calculation unit 31 determines a region to be pasted in a specific texture image stored in the texture image storage unit 33 based on the texture coordinate value associated with the vertex of the polygon i and the image ID. Is determined, and the average value TEXav of the brightness values of the texture image in the determined area is determined.
(Pi) is calculated and held for each polygon.

The correction parameter calculation unit 31 obtains a predetermined feature value of the luminance value of the surface on which the texture image is to be pasted, according to the predetermined data of the polygon i from the display image generation unit 32. More specifically, the correction parameter calculation unit 31
An area S (Pvi) of the polygon i in the display image is obtained based on predetermined data of the polygon i from the display image generation unit 32. Further, the correction parameter calculation unit 31 obtains a value obtained by multiplying the luminance value corresponding to the vertex of the polygon i by the luminance value of the texture image, and sets the maximum value and the minimum value among the obtained values to the specific texture image. Are acquired as the maximum value Imax 'and the minimum value Imin' of the luminance value on the surface of the display image after pasting. Further, the correction parameter calculation unit 31 calculates the area S (Pvi) of the obtained polygon i and the average value Iav (Pvi) of the luminance values before pasting the specific texture image.
Si), and the average value TEXav of the luminance values in the texture image
Using (Pi), the average value Iav 'on the surface after the specific texture image is pasted is obtained by the following equation (2).

[0057]

(Equation 2)

The correction parameter calculator 31 calculates an image correction parameter value for each specific texture image, as in the above embodiment. That is, the correction parameter calculator 31 calculates the desired contrast value I set in advance.
Using the con value and the maximum value Imax ', minimum value Imin', and average value Iav 'of the luminance values obtained as the values in the texture image pasting area, the gain value G is calculated by the calculation method shown in the above embodiment. And an offset value Ioff. The correction parameter calculation unit 31 outputs the calculated gain value G and offset value Ioff together with the average value Iav 'to the image correction unit 34.

The texture image storage section 33 stores a texture image in association with an image ID. The texture image data stored in the texture image storage unit 33 is different from that of the above-described embodiment.
2 and the correction parameter calculator 31. The image correction unit 34 uses the image correction parameter value from the correction parameter calculation unit 31 to store the texture image display area storage unit 6.
The luminance value of each pixel on the display screen specified in the texture image display area from the pixel is corrected. More specifically, the image correction unit 34 uses the gain value G and the offset value Ioff calculated by the correction parameter calculation unit 31 to calculate the pixels included in the texture image display area according to the above equation (1). Correcting each brightness value Ipix and brightness value Ipix 'after image correction processing
Is obtained in pixel units.

[Operation of Image Display Apparatus] The third embodiment will be described below.
The operation of the image display device will be specifically described. still,
In the following description, as in the first embodiment, a case where the display image shown in FIG. 3 is generated and displayed will be described as an example.
Further, in the following description, operations different from those of the first embodiment will be mainly described. In the image display device according to the third embodiment, the display image generation unit 32 displays a part of the surface 42 on which a specific texture image is to be pasted, which is actually displayed on the display screen (shown by a hatched portion in FIG. 3) as a texture image. Output to the texture image display area storage unit 6 as a display area. The display image generation unit 32 outputs to the image correction unit 34 data of the display image including at least the luminance value determined for each pixel of the display screen. Further, the display image generation unit 32 outputs a luminance value, a texture coordinate value, and a texture value before pasting a texture image at each vertex of each polygon forming the surface 42.
And the display coordinate values are output to the correction parameter calculator 31.

On the other hand, when the correction parameter calculation unit 31 inputs the data of the three-dimensional objects 41 and 43 from outside, the correction parameter calculation unit 31 obtains the area of each polygon on the display screen. Further, after determining the area of the specific texture image to be pasted on the front surface 42, the correction parameter calculation section 31 acquires the luminance value in that area from the texture image storage section 33. Then, based on the acquired brightness value of the texture image, the correction parameter calculation unit 31 calculates and stores the average value of the brightness values in the texture image for each polygon. Subsequently, the correction parameter calculation unit 3
When 1 inputs the data of each polygon from the display image generation unit 32, the correction parameter calculation unit 31 obtains the maximum value, the minimum value, and the average value of the brightness values of each polygon before pasting the texture image.

Next, the correction parameter calculation unit 31 uses the stored luminance value of the texture image and the luminance value of each polygon before pasting the texture image,
The maximum value, the minimum value, and the average value of the luminance values of the vertices of each polygon on the surface 42 after the specific texture image is pasted are obtained. More specifically, the correction parameter calculator 31 calculates the average value of the luminance values by the above-described equation (2), and multiplies the maximum value and the minimum value by the luminance value corresponding to the vertex of each polygon and the luminance value of the texture image. The obtained values are obtained by finding the maximum value and the minimum value. Subsequently, the correction parameter calculator 31 calculates a gain value and an offset for the texture image on the surface 42 by using a preset desired contrast value and the obtained maximum, minimum, and average brightness values of the polygon. The value is obtained and output to the image correction unit 34 as an image correction parameter value. Next, the image correction unit 34 substitutes the average value of the gain value, the offset value, and the luminance value calculated by the correction parameter calculation unit 31 into the above-described expression (1) to obtain the texture from the texture image display area storage unit 6. Correct the luminance value of the pixels included in the image display area.
Then, the image correction unit 34 outputs the data of the display image including the corrected luminance value to the video memory unit 9 as data after the image correction processing.

As described above, in the image display apparatus and the image correction method according to the third embodiment, the correction parameter calculation section 31 is connected to the display image generation section 32 and the texture image storage section 33, and the predetermined coordinate conversion processing is performed. The configuration is such that the data of the subsequent display image and the data of the specific texture image are input to the correction parameter calculation unit 31. Accordingly, in the image display device and the image correction method according to the third embodiment,
The correction parameter calculation unit 31 can obtain an image correction parameter value for a region (texture image pasting region) to which a texture image (for example, a natural image) specified as an image correction target is pasted. Therefore, in the image display device and the image correction method according to the third embodiment, in addition to the effects of the above-described embodiment, the texture image pasting area storage unit can be omitted, and the configuration of the device can be simplified. .

Embodiment 4 [Structure of Image Display Apparatus] FIG. 9 is a block diagram showing the structure of an image display apparatus according to Embodiment 4 of the present invention. In this embodiment, in the configuration of the image display device, the correction parameter calculation unit is configured to calculate an image correction parameter value based on the size of the above-described texture image display area, and the calculated image correction parameter value is used. The image correction unit is configured to perform the image correction processing on the display image. The other parts are the same as those of the third embodiment, and the duplicate description thereof will be omitted. As shown in FIG.
In the image display device, the third switch 82 is connected between the correction parameter calculation unit 31 and the display image generation unit 32, and the fourth switch 83 is connected to the display image generation unit 32, the image correction unit 84, and the video memory unit. 9 is connected. The third and fourth switches 82 and 83 perform the switching operation according to the size of the texture image display area from the texture image display area storage unit 81.

More specifically, in the image display apparatus of the fourth embodiment, the texture image display area storage section 81 stores the texture image display area input from the display image generation section 32 in the same manner as in the second embodiment. Then, the size of the stored texture image display area is changed by the third and fourth switches 82 and 8.
Output to 3. A specific example of the size of the texture image display area includes, for example, the number of pixels on the display screen. The texture image display area storage unit 81 outputs the stored texture image display area to the image correction unit 84. Specifically, the texture image display area storage unit 81 outputs the pixel positions on the display screen included in the texture image display area to the image correction unit 84. The third switch 82 compares the size of the texture image display area from the texture image display area storage unit 81 with a preset specified value, and determines that the size of the texture image display area is equal to or larger than the specified value. Third
Switch 82 connects the display image generator 32 to the correction parameter calculator 31. As a result, the correction parameter calculation unit 31 determines the image correction parameter value for correcting the specific texture image in the same manner as in the third embodiment only when the texture image display area is larger than a predetermined value. Is calculated. Similarly, the fourth switch 83 compares the size of the texture image display area from the texture image display area storage unit 81 with a preset specified value. When the size of the texture image display area is equal to or larger than the specified value, the fourth switch 83 connects the display image generation unit 32 to the image correction unit 84. When the size of the texture image display area is smaller than the specified value, the fourth switch 83 connects the display image generator 32 to the video memory 9. Thus, the image correction process is performed on the specific texture image only when the size is equal to or larger than the predetermined size on the display screen.

The image correction section 84 determines the texture image display area from the texture image display area storage section 81.
The image correction processing is performed on the data of the display image from the display image generation unit 32 using the image correction parameter value from the correction parameter calculation unit 31. More specifically, when the number of pixels V1 ′ is set in advance as a specified value in the third and fourth switches 82 and 83, the image correction unit 84 sets the number of pixels V2 ′ used for calculating the image correction parameter value. And the number of pixels V described above
The value of the difference from 1 ′ is calculated, and the ratio α ′ to the difference between the number of pixels V3 ′ and the number of pixels V1 ′ (= (V3′−V1 ′). ) / (V2'-V
1 ′)) is calculated. The image correction unit 84 substitutes the calculated ratio α ′ and the gain value G and the offset value Ioff from the correction parameter calculation unit 31 into the above-described equation (1) ′, similarly to the second embodiment. To correct the luminance value in pixel units. Note that the above-described pixel number V2 ′ is the number of pixels on the display screen included in the texture image pasting area, that is, the total number of pixels subjected to image analysis. After that, it is input to the image correction unit 84. The number of pixels V3 ′ is the number of pixels on the display screen included in the texture image display area, and is input from the texture image display area storage unit 81 to the image correction unit 84. The maximum value that the pixel number V3 'can take is the pixel number V2'.

[Operation of Image Display Apparatus] Hereinafter, the fourth embodiment will be described.
The operation of the image display device will be specifically described. still,
In the following description, operations different from those of the third embodiment will be mainly described. In the image display device according to the fourth embodiment, the texture image display area storage unit 81 stores the IDs of the polygons and the vertices of the polygons excluding the part that does not overlap and display the three-dimensional object 43 among the polygons forming the surface 42. The pixel position on the display screen including the corresponding display coordinate value is input from the display image generation unit 32 as a texture image display area and stored. Then, the texture image display area storage unit 8
1 outputs the stored pixel number V3 ′ included in the texture image display area to the third and fourth switches 82 and 83 as the size of the texture image display area. Next, in the third and fourth switches 82 and 83, the input pixel number V3 ′ and the preset pixel number V3 ′ are set.
Compare with 1 '.

When the number of pixels V3 'is equal to or more than the number of pixels V1', the third switch 82 connects the display image generator 32 to the correction parameter calculator 31, and the fourth switch 83 connects the display image generator 32 to the image. Connect to the correction unit 84. As a result, similarly to the third embodiment, the correction parameter calculation unit 31 inputs the data of the display image after the above-described coordinate conversion processing and the data of the specific texture image, and The image correction parameter value for is calculated. Then, the correction parameter calculator 31 calculates
The calculated image correction parameter value and the number of pixels V in the calculation
2 ′ is output to the image correction unit 84. The display image data generated by the display image generation unit 32 is output to the image correction unit 84 via the fourth switch 83. continue,
The image correction unit 84 weights the image correction parameter values according to the size of the texture image display area,
The luminance value of each pixel in the texture image display area is corrected. Specifically, the image correction unit 84 calculates the ratio α ′ to the value of the difference in pixel number (V3′−V1 ′) when the value of the difference in pixel number (V2′−V1 ′) is set to 1. , And the gain value and the offset value included in the image correction parameter value. Then, the image correction unit 84 corrects the luminance value of each pixel included in the texture image display area using the equation (1) ′ in the same manner as in the second embodiment, and performs image correction processing. The data is output to the video memory unit 9 while being included in the image data.

On the other hand, when the number of pixels V 3 ′ is smaller than the number of pixels V 1 ′, the third switch 82 does not connect the display image generator 32 to the correction parameter calculator 31 and the fourth switch 8
3 connects the display image generation unit 32 to the video memory unit 9.
Thus, the data of the display image generated by the display image generation unit 32 is output to the video memory unit 9 without being subjected to the image correction processing by the image correction unit 84 and stored. That is, in the image display device of the fourth embodiment, when the portion actually displayed on the display screen is small, for example, as shown in the display image shown in FIG. It is possible to omit the image correction processing by judging that the influence of the image quality deterioration by the image can be almost ignored. As a result, in the image display device of the fourth embodiment, in addition to the effects of the third embodiment, the time required for data processing can be reduced according to the size of the texture image display area.

As described above, in the image display device and the image correction method according to the fourth embodiment, the texture image display area storage unit 81 stores the size of the specific texture image input from the display image generation unit 32 into the third and third sizes. 4 switches 82 and 83. The third switch 82 connects the display image generator 32 and the correction parameter calculator 31 when the size of the texture image display area is equal to or larger than a predetermined value. If the size of the texture image display area is equal to or greater than a predetermined value, the fourth switch 8
3 connects the display image generation unit 32 and the image correction unit 84,
When the size of the texture image display area is smaller than a predetermined value, the fourth switch 83 connects the display image generation unit 32 and the video memory unit 9. Accordingly, in the image display device and the image correction method according to the fourth embodiment,
In addition to the effects of the third embodiment, it is possible to determine whether or not to perform image correction processing on a display image on which a specific texture image is pasted, in accordance with an area where a specific texture image is displayed on a display screen. it can. As a result, in the image display device and the image correction method according to the fourth embodiment, when the ratio of a specific texture image to the display screen is small, the image correction process can be omitted, and the image correction process can be omitted as compared with the third embodiment. The time required for data processing can be reduced.

Embodiment 5 [Structure of Image Display Apparatus] FIG. 10 is a block diagram showing the structure of an image display apparatus according to Embodiment 5 of the present invention. In this embodiment, in the configuration of the image display device, the correction parameter calculation unit is configured to change the image correction parameter value obtained by using a change instruction value input from outside. The other parts are the same as those of the first embodiment, and the duplicate description thereof will be omitted. As shown in FIG. 10, in the image display device according to the fifth embodiment, the correction parameter calculation unit 11
Reference numeral 7 is configured to externally input a change instruction value for correcting and changing the image correction parameter value. More specifically, similarly to the first embodiment, the correction parameter calculation unit 117 compares the texture image pasting area from the texture image pasting area storage unit 5 with the luminance value of each pixel included in the area. Input and perform image analysis. Further, the correction parameter calculating section 117 calculates a gain value G1 and an offset value Ioff1 based on the result of the image analysis and a preset desired contrast value.
The correction parameter calculation unit 117 changes the calculated gain value G1 and offset value Ioff1 using the gain value change value G2 and offset value change value Ioff2 input from outside as change instruction values. The correction parameter calculation unit 117 includes, for example, a gain value G1 and its changed value G
2 and outputs it to the image correction unit 8 as a corrected gain value G ″. The correction parameter calculation unit 117 calculates, for example, the sum of the offset value Ioff1 and the changed value Ioff2. The value of (Ioff1 + Ioff2) is obtained and output to the image correction unit 8 as a corrected offset value Ioff ". Thus, in the image display device of the fifth embodiment, in addition to the effects of the first embodiment, the content of the image correction processing on the surface portion on which the specific texture image is pasted can be easily changed. As a result, the image correction apparatus of the fifth embodiment can easily generate and display a display image having a desired contrast as compared with the image correction apparatus of the first embodiment.

[Operation of Image Display Apparatus] Hereinafter, the fifth embodiment will be described.
The operation of the image display device will be specifically described. still,
In the following description, operations different from those in the first embodiment will be mainly described. In the image display device according to the fifth embodiment, the correction parameter calculation unit 117 inputs the texture image pasting region from the texture image pasting region storage unit 5 and the luminance values of the pixels included in the region. Then, the correction parameter calculation unit 117 calculates an image correction parameter value in the texture image pasting area based on the input luminance value. Specifically, the correction parameter calculation unit 117
Calculates the maximum value, the minimum value, and the average value of the luminance values included in the surface 42, and further calculates the difference between the maximum value and the minimum value. After that, the correction parameter calculation unit 117 obtains a ratio between the calculated difference value and a preset desired contrast value as a gain value with respect to a luminance value in the image correction processing. Further, the correction parameter calculation unit 117
Determines whether the luminance value after image correction processing falls within the range between the maximum luminance value and the minimum luminance value of the display screen based on the obtained gain value and the maximum value and the minimum value of the luminance value of the surface 42. . When the luminance value after the image correction processing does not fall within the above-described range, the correction parameter calculation unit 117 performs processing so that the luminance value after the image correction processing does not exceed the maximum luminance value and falls within the minimum luminance value. , And calculates the offset value based on the obtained average value.

Next, when the correction parameter calculation unit 117 receives a change value of a gain value and a change value of an offset value as change instruction values from outside, the correction parameter calculation unit 1
Numeral 17 changes the obtained gain value and offset value using the input gain value and offset value change values, and averages the changed gain value and offset value as image correction parameter values on the surface 42. The value is output to the image correction unit 8 together with the value. Subsequently, the image correction unit 8 substitutes the gain value, the offset value, and the average value from the correction parameter calculation unit 117 into the above-described equation (1), and stores the texture image stored in the texture image display area storage unit 6. Correction is made for each luminance value of the pixel in the display area. Specifically, the luminance value of the portion displayed on the display screen of the surface 42 on which the texture image is pasted is corrected, and a display image having a desired contrast is generated. Then, the image correction unit 8 outputs the display image subjected to the image correction processing to the video memory unit 9. Finally, the video memory unit 9
The display image data output from the image correction unit 8 is held.

As described above, in the image display apparatus and the image correction method according to the fifth embodiment, the correction parameter calculation unit 117 corrects and changes the calculated correction parameter value using the change instruction value input from the outside. It is configured. Accordingly, in the image display device and the image correction method according to the fifth embodiment, in addition to the effects of the first embodiment, the content of the image correction processing for a specific texture image can be easily changed. As a result, with the image correction device and the image correction method according to the fifth embodiment, it is possible to easily generate and display a display image having a desired contrast as compared with the first embodiment.

Embodiment 6 [Structure of Image Display Apparatus] FIG. 11 is a block diagram showing the structure of an image display apparatus according to Embodiment 6 of the present invention. In this embodiment, in the configuration of the image display device, the correction parameter calculation unit is configured to change the image correction parameter value obtained by using a change instruction value input from outside. The other parts are the same as those of the third embodiment, and the duplicate description thereof will be omitted. As shown in FIG. 11, in the image display device of the sixth embodiment, the correction parameter calculating unit 12
Reference numeral 1 is configured to externally input a change instruction value for correcting and changing an image correction parameter value. More specifically, similarly to the third embodiment, the correction parameter calculation unit 121 inputs the display image data after the above-described coordinate conversion processing and the data of the specific texture image, and Image analysis is performed on the texture image to be pasted. Further, the correction parameter calculation unit 121
On the basis of the result of the image analysis and a preset desired contrast value, the gain value G1 ′ and the offset value I
off1 'is calculated. The correction parameter calculation unit 121
Using the change value G2 ′ of the gain value and the change value Ioff2 ′ of the offset value input from the outside as the change instruction value,
The calculated gain value G1 ′ and offset value Ioff1 ′ are changed respectively. The correction parameter calculator 121 calculates, for example, the difference between the gain value G1 ′ and the changed value G2 ′ (G1′−
G2 '), and outputs the corrected gain value G3 to the image correction unit 34. Correction parameter calculator 121
Is, for example, an offset value Ioff1 'and its changed value Ioff2'
(Ioff1 '+ Ioff2'), and outputs the corrected offset value Ioff3 to the image correction unit 34.
Accordingly, in the image display device of the sixth embodiment, in addition to the effects of the third embodiment, the content of the image correction processing for the surface portion on which the specific texture image is pasted can be easily changed. As a result, the image correction apparatus according to the sixth embodiment can easily generate and display a display image having a desired contrast as compared with the image correction apparatus according to the third embodiment.

[Operation of Image Display Apparatus] Hereinafter, the sixth embodiment will be described.
The operation of the image display device will be specifically described. still,
In the following description, operations different from those of the third embodiment will be mainly described. In the image display device according to the sixth embodiment, the correction parameter calculation unit 121 transmits the data of the display image after the above-described coordinate conversion processing and the data of the specific texture image from the display image generation unit 32 and the texture image storage unit 33, respectively. input. Further, the correction parameter calculation unit 121
Calculates a predetermined feature amount of a luminance value in an area where a specific texture image is to be pasted, and calculates a gain value and an offset value of an image correction parameter value. Next, when the correction parameter calculation unit 121 inputs a change value of a gain value and a change value of an offset value from outside as a change instruction value, the correction parameter calculation unit 121 changes the gain value and the offset value that are being input. The obtained gain value and offset value are respectively changed using the values, and the changed gain value and offset value are output to the image correction unit 34 together with the average value as the image correction parameter value on the surface 42. continue,
The image correction unit 34 substitutes the gain value, the offset value, and the average value from the correction parameter calculation unit 121 into the above-described equation (1), so that the image data in the texture image display area stored in the texture image display area storage unit 6 is obtained. Is corrected for each of the luminance values of the pixels. Specifically, the luminance value of the portion displayed on the display screen of the surface 42 on which the texture image is pasted is corrected, and a display image having a desired contrast is generated. Then, the image correction unit 34 outputs the display image subjected to the image correction processing to the video memory unit 9. Lastly, the video memory unit 9 holds the data of the display image output from the image correction unit 34.

As described above, in the image display device and the image correction method according to the sixth embodiment, the correction parameter calculation unit 121 corrects and changes the calculated correction parameter value using the change instruction value input from the outside. It is configured. Thus, in the image display device and the image correction method according to the sixth embodiment, in addition to the effects of the third embodiment, the content of the image correction processing for a specific texture image can be easily changed. As a result, with the image correction apparatus and the image correction method according to the sixth embodiment, it is possible to easily generate and display a display image having a desired contrast as compared with the third embodiment.

In the description of each of the above embodiments, the description has been given of the configuration in which the image correction processing for improving the contrast by correcting the luminance value of the display screen in pixel units, but the embodiments are not limited thereto. Instead of determining the texture image pasting area where the texture image specified as the image correction processing target is pasted and the texture image display area where the texture image is actually displayed on the display screen,
Any configuration may be used as long as the image correction process optimal for the determined texture image is selected and executed. For example, a color difference signal of a pixel included in the texture image pasting area is analyzed as correction target data at the time of the image correction processing, an image correction parameter value for correcting the color difference signal is obtained, and a pixel of the texture image display area is analyzed. A configuration may be used in which each color difference signal is corrected to improve the color balance of the display image on which the texture image is pasted. In the description of each of the above embodiments, 3
The example in which the specific texture image is pasted and corrected on one surface 42 of the three-dimensional object 41 has been described. However, the surface on which the specific texture image is pasted is not limited to one. Any configuration may be used as long as the image correction processing can be performed by determining the image correction parameter value.

Further, in the description of each of the embodiments described above, the configuration in which the texture image for mapping is stored in the texture image storage unit in advance has been described. However, the embodiment is not limited to this. Any configuration is possible as long as the unit can select, determine, and map the texture image. For example, by connecting the image display device to an external device that stores or generates image data that can be used as a texture image, the display image generation unit and the correction parameter calculation unit can select a texture image, or the display image generation unit A configuration in which the correction parameter calculation unit outputs and instructs the correction parameter calculation unit may be used. In the description of the second and fourth embodiments, the value of the difference between the number of pixels used for calculating the image correction parameter value and the number of pixels set for each switch is one.
Although the configuration in which the ratio of the difference between the number of pixels in the texture image display area and the set number of pixels in the texture image display area is determined and the gain value and the offset value are multiplied has been described, the embodiment of the present invention has It is not limited to
The method of correcting the gain value and the offset value is not limited as long as the data on the display screen after the image correction processing changes smoothly before each switch is switched.

The image display device of each of the above embodiments is
For example, it can be configured using a personal computer. In addition, since the image correction method in each of the above-described embodiments can be computer-programmed, a computer-executable recording medium can provide the image correction method of the present application. The recording medium here means a floppy disk, CD
-Data recording devices including ROM, DVD, magneto-optical disk, removable hard disk, and flash memory.

[0081]

As described above, according to the image display apparatus and the image correction method of the present invention, the display image generation unit uses the coordinate position information from the geometry calculation unit and the conversion parameter value from the display coordinate conversion unit. A display image is being generated. Further, the display image generation unit calculates a texture image pasting region, which is a surface region to which a specific texture image is pasted, and correction analysis target data included in the texture image pasting region for each pixel, and A texture image display area to be displayed as the display image is obtained from the area. The texture image pasting region storage unit stores the texture image pasting region from the display image generation unit and the correction analysis target data included in the texture image pasting region, and the texture image display region storage unit stores the texture image pasting region from the display image generation unit. The texture image display area is stored. The correction parameter calculation unit uses the texture image pasting region and the correction analysis target data stored in the texture image pasting region storage unit,
The image correction parameter value is calculated. The image correction unit
The texture image display area stored in the texture image display area storage unit is corrected for each pixel using the image correction parameter value from the correction parameter calculation unit. With such a configuration, in the image display device and the image correction method of the present invention, even when a three-dimensional object in which a natural image is mapped on a part of the surface is displayed as a display image, deterioration of the image quality of the display image is prevented. Without occurring
Image correction processing can be optimally performed according to image characteristics.

In the image display apparatus and the image correction method according to another aspect of the present invention, the display image generation unit performs display by using the coordinate position information from the geometry calculation unit and the conversion parameter value from the display coordinate conversion unit. Generating images.
Further, the display image generation unit obtains a texture image display area in which a specific texture image is displayed as the display image for the generated display image. The texture image display area storage unit stores the texture image display area from the display image generation unit. The correction parameter calculation unit inputs the data of the display image from the display image generation unit and the data of the specific texture image, and obtains the correction analysis target data of the surface area on which the specific texture image is pasted, The image correction parameter value is calculated. An image correction unit corrects the texture image display area stored in the texture image display area storage unit on a pixel-by-pixel basis using the image correction parameter value from the correction parameter calculation unit. With such a configuration, in the image display device and the image correction method of the present invention, even when a three-dimensional object in which a natural image is mapped on a part of the surface is displayed as a display image, deterioration of the image quality of the display image is prevented. The image correction process can be optimally performed according to the image characteristics without any occurrence. Further, according to the image display device and the image correction method of the present invention, since the image correction parameter value can be calculated without providing the texture image pasting area storage unit, the configuration of the device is simplified as compared with the above-described invention. be able to.

Further, since the image correction method of the present invention can be made into a computer program, the image correction method of the present invention is not performed if the image correction method of the present invention is recorded on a computer-executable recording medium. can do.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an image display device that is Embodiment 1 of the present invention.

FIG. 2 is an explanatory diagram showing a specific example of a three-dimensional object displayed on the image display device shown in FIG.

FIG. 3 is an explanatory diagram showing a display example in which the three-dimensional object shown in FIG. 2 is generated as a display image and displayed on a display screen.

FIG. 4 is an explanatory diagram showing a drawing method of one triangular polygon in the display image generating unit shown in FIG. 1;

FIG. 5 is a flowchart showing the operation of the display image generation unit shown in FIG. 1;

FIG. 6 is a block diagram illustrating a configuration of an image display device that is Embodiment 2 of the present invention.

FIG. 7 is an explanatory diagram showing another display example in which the three-dimensional object shown in FIG. 2 is generated as a display image and displayed on a display screen.

FIG. 8 is a block diagram illustrating a configuration of an image display device that is Embodiment 3 of the present invention.

FIG. 9 is a block diagram illustrating a configuration of an image display device that is Embodiment 4 of the present invention.

FIG. 10 is a block diagram illustrating a configuration of an image display apparatus according to a fifth embodiment of the present invention.

FIG. 11 is a block diagram illustrating a configuration of an image display device that is Embodiment 6 of the present invention.

FIG. 12 is a block diagram showing a configuration of a conventional image display device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Geometry calculation part 2 Display coordinate conversion part 3,33 Texture image storage part 4,32 Display image generation part 5 Texture image pasting area storage part 6,26,81 Texture image display area storage part 7,31,117,121 Correction parameter Arithmetic unit 8, 29, 34, 84 Image correction unit 9 Video memory unit 27 First switch 28 Second switch 41, 43 Three-dimensional object 42 Surface to which a specific texture image of three-dimensional object 41 is pasted 82 Third Switch 83 fourth switch

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Sanae Aoyagi 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Yutaka Shirai 1006 Okadoma Kadoma Kadoma City, Osaka Matsushita Electric Industrial F Terms (reference) 5B057 CA08 CA12 CA16 CB08 CB12 CB16 CE08 CE11 5B080 AA14 BA04 GA22 5C082 AA01 AA36 BA12 BB42 CA00 CA32 CA55 CB06 DA51 DA87 MM10

Claims (12)

[Claims] 1. An image display device for inputting data of a three-dimensional object drawn by three-dimensional computer graphics, pasting a texture image on at least a part of the surface of the three-dimensional object, and generating and displaying a display image. A geometry operation unit for converting the three-dimensional object into coordinate position information projected on a virtual screen, for converting the coordinate position information input from the geometry operation unit into display coordinate position information on a display image. A display coordinate conversion unit that calculates a conversion parameter value, a display image is generated using the coordinate position information from the geometry calculation unit and the conversion parameter value from the display coordinate conversion unit, and a surface to which a specific texture image is pasted The texture image pasting area, which is the area of, and the correction analysis target data contained in the texture image pasting area A display image generating unit for calculating a unit and further obtaining a texture image display area displayed as the display image among the texture image pasting areas; and a texture image pasting area from the display image generating unit and the texture image pasting area. A texture image pasting area storage unit that stores correction analysis target data included in the texture image display area storage unit that stores a texture image display area from the display image generation unit; Using the texture image pasting region and the correction analysis target data, a correction parameter calculation unit that calculates an image correction parameter value, and using the image correction parameter value from the correction parameter calculation unit to the texture image display region storage unit Pixels for the stored texture image display area The image display apparatus comprising the image correction unit, for correcting the position. 2. The image processing apparatus according to claim 1, wherein the correction parameter calculation unit calculates an image correction parameter value based on a size of the texture image display area stored in the texture image display area storage unit. The image display device according to claim 1, wherein the image correction unit performs an image correction process on a display image using a correction parameter value. 3. A case where the size of the texture image display area from the texture image display area storage unit is greater than or equal to a predetermined value, which is connected between the texture image pasting area storage unit and the correction parameter calculation unit. A first switch for connecting the texture image pasting area storage unit and the correction parameter calculation unit to the display image generation unit and the image correction unit; 3. The apparatus according to claim 1, further comprising a second switch for connecting the display image generation unit and the image correction unit when the size of the texture image display area is equal to or larger than a predetermined specified value. The image display device as described in the above. 4. The image processing apparatus according to claim 1, wherein said correction parameter calculation unit changes an image correction parameter value obtained by using a change instruction value input from outside.
The image display device according to any one of the above. 5. An image display device for inputting data of a three-dimensional object drawn by three-dimensional computer graphics, pasting a texture image on at least a part of the surface of the three-dimensional object, and generating and displaying a display image. A geometry operation unit for converting the three-dimensional object into coordinate position information projected on a virtual screen, for converting the coordinate position information input from the geometry operation unit into display coordinate position information on a display image. A display coordinate conversion unit for calculating a conversion parameter value, using the coordinate position information from the geometry calculation unit and the conversion parameter value from the display coordinate conversion unit to generate a display image, and further in the generated display image, A display image generation unit that determines a texture image display area in which a specific texture image is displayed as the display image; A texture image display area storage unit that stores a texture image display area from the display image generation unit; data of the display image from the display image generation unit, and data of the specific texture image; A correction parameter calculation unit for calculating the correction analysis target data of the area of the surface on which is pasted, and calculating the image correction parameter value; and using the image correction parameter value from the correction parameter calculation unit, storing the texture image display area. An image correction unit that corrects the texture image display area stored in the unit on a pixel-by-pixel basis. 6. The image processing apparatus according to claim 1, wherein the correction parameter calculation unit calculates an image correction parameter value based on a size of the texture image display area stored in the texture image display area storage unit. The image display device according to claim 5, wherein the image correction unit performs an image correction process on a display image using a correction parameter value. 7. When the size of the texture image display area from the texture image display area storage unit is greater than or equal to a predetermined value, the apparatus is connected between the display image generation unit and the correction parameter calculation unit. A third switch for connecting a display image generation unit and the correction parameter calculation unit, a texture image display area connected between the display image generation unit and the image correction unit, and a texture image display area from the texture image display area storage unit 7. The image display according to claim 5, further comprising: a fourth switch for connecting the display image generation unit and the image correction unit when the size of the image is equal to or more than a predetermined specified value. apparatus. 8. The image processing apparatus according to claim 5, wherein the correction parameter calculation unit changes the image correction parameter value obtained by using a change instruction value input from outside.
The image display device according to any one of the above. 9. An image for inputting data of a three-dimensional object drawn by three-dimensional computer graphics, pasting a texture image on at least a part of the surface of the three-dimensional object, and generating and displaying a display image A conversion method for converting the three-dimensional object into coordinate position information projected onto a virtual screen, and converting the coordinate position information converted in the conversion step into display coordinate position information on a display image. A calculation step of calculating the conversion parameter value of the generation step; a generation step of generating a display image using the coordinate position information converted in the conversion step and the conversion parameter value calculated in the calculation step; Texture image pasting area, which is the area of the surface where the specific texture image is pasted, Calculating the correction analysis target data included in the texture image pasting area in units of pixels, and further calculating a texture image display area displayed as the display image in the texture image pasting area, the area calculating step A texture image pasting area storing the texture image pasting area calculated in and the correction analysis target data included in the texture image pasting area; and a texture image display storing the texture image display area obtained in the area computing step. An area storage step, a correction parameter calculation step of calculating an image correction parameter value using the texture image pasting area and the correction analysis target data stored in the texture image pasting area storage step, and a calculation in the correction parameter calculation step An image correction step of correcting the texture image display area stored in the texture image display area storage step for each pixel using the obtained image correction parameter value. 10. Data of a three-dimensional object drawn by three-dimensional computer graphics is input.
An image correction method for generating and displaying a display image by pasting a texture image on at least a part of a surface of a three-dimensional object, wherein the three-dimensional object is converted into coordinate position information projected on a virtual screen. An operation step of calculating a conversion parameter value for converting the coordinate position information converted in the conversion step into display coordinate position information in a display image; and the coordinate position information converted in the conversion step and the calculation step. A generation step of generating a display image using the calculated conversion parameter value; and obtaining a texture image display area in which a specific texture image is displayed as the display image for the display image generated in the generation step. A calculating step, a texture image storing the texture image display area obtained in the area calculating step Display area storage step, based on the data of the display image generated in the generation step, and the data of the specific texture image, to determine the correction analysis target data of the area of the surface on which the specific texture image is pasted, Correcting the texture image display area stored in the texture image display area storing step in pixel units using a correction parameter calculation step of calculating an image correction parameter value, and the image correction parameter value calculated in the correction parameter calculation step An image correction method, comprising: 11. Converting a three-dimensional object drawn by three-dimensional computer graphics into coordinate position information projected onto a virtual screen; and converting the converted coordinate position information into display coordinate position information in a display image. Calculating a conversion parameter value for conversion; generating a display image by using the converted coordinate position information and the calculated conversion parameter value; identifying the generated display image The texture image pasting area, which is the area of the surface where the texture image is pasted, and the correction analysis target data included in the texture image pasting area are calculated for each pixel, and further displayed as the display image in the texture image pasting area. Determining a texture image display area to be calculated; Storing correction analysis target data included in the texture image pasting region; storing the obtained texture image display region; and performing image correction using the stored texture image pasting region and the correction analysis target data. Calculating a parameter value, and using the calculated image correction parameter value to correct the stored texture image display area on a pixel-by-pixel basis. recoding media. 12. Converting a three-dimensional object drawn by three-dimensional computer graphics into coordinate position information projected onto a virtual screen, and converting the converted coordinate position information into display coordinate position information in a display image. Calculating a conversion parameter value for conversion; generating a display image using the converted coordinate position information and the calculated conversion parameter value; identifying the generated display image Determining a texture image display area in which the texture image is displayed as the display image; storing the determined texture image display area; data of the generated display image, and data of the specific texture image. Based on this, the data for correction analysis of the surface area on which the specific texture image is pasted is obtained, and the image Calculating a parameter value, and correcting the texture image display area stored in the texture image display area storing step in units of pixels using the calculated image correction parameter value. Recording medium storing an image correction program to be executed.