JP2011076145A - Image display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To display the rendering image of a three-dimensional model with high quality while reducing a processing load. <P>SOLUTION: A computer 20 attaches, to a three-dimensional model, each bit position in case of expressing coordinates (x, y) as a binary digit, a monochrome vertically striped pattern for x coordinates corresponding to a bit value and an inversion pattern obtained by inverting this, and a monochrome horizontally striped pattern for y coordinates and an inversion pattern obtained by inverting this for performing rendering, and compares the vertically striped pattern with the inversion pattern, and compares the horizontally striped pattern with the inversion pattern, in the rendered image, and discriminates the black and white of each coordinate (x, y) of the vertically striped pattern and the horizontally striped pattern, and sets correspondence between coordinates (x, y) of the rendered image and coordinates (Xt(x, y), Yt(x, y)) of the texture. A viewer 40 performs image plotting in the coordinates (x, y) of the display image based on the gradation values of the coordinates (Xt(x, y), Yt(x, y)) of the texture according to preliminarily set image plotting information. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an image display method for displaying an image.

  Conventionally, as this kind of image display method, a three-dimensional model is rendered in real time and displayed on a display (see, for example, Patent Document 1), and a three-dimensional model is rendered in advance to create a bitmap image. It has been proposed that the display is performed by reading a bitmap image.

Japanese Patent Application Laid-Open No. 07-152925

  In the former method, since it is necessary to perform the rendering process at a cycle shorter than the display cycle of the screen, a high calculation capability is required. Therefore, depending on the computer to be used, there is a shortage in computing ability, and high quality rendering such as ray tracing cannot be performed. On the other hand, since the latter method only displays a bitmap image, it is possible to display a high-quality image by creating a bitmap image by performing high-quality rendering in advance. Then you can't replace it with a different texture later.

  The main object of the image display method of the present invention is to display a high-quality rendering image of a three-dimensional model with less processing load.

  The image display method of the present invention employs the following means in order to achieve the main object described above.

The image display method of the present invention includes:
An image display method for displaying an image,
(A) A first pattern in which different gradation values are set for each coordinate and a second pattern in which the gradation values of the first pattern are inverted are created, and the created first pattern and second pattern are created. Paste the pattern as a texture on the 3D model and render each.
(B) The gradation value of the first rendered image obtained as a bitmap image by rendering the first pattern and the second rendered image obtained as a bitmap image by rendering the second pattern By comparing the gradation value for each coordinate, the correspondence between the coordinates of the rendered image and the coordinates of the pattern is set and stored as image drawing information,
(C) When displaying a desired texture as an image, the gist is to arrange and display the desired texture in the rendered image based on the stored image drawing information.

  In the image display method according to the present invention, a first pattern in which a first pattern in which a different gradation value is set for each coordinate and a second pattern in which the gradation value of the first pattern is inverted are created and the first pattern is created. And the second pattern as textures and pasted on the three-dimensional model, respectively, and rendered. The gradation values of the first rendered image obtained as a bitmap image by rendering the first pattern and the second pattern By comparing the gradation value of the second rendered image obtained as a bitmap image by rendering with the coordinates for each coordinate, the correspondence between the coordinates of the rendered image and the coordinates of the pattern is set and saved as image drawing information However, when displaying a desired texture as an image, it is included in the rendered image based on the saved image drawing information. Arranging and displaying the texture. Thereby, a desired texture can be replaced and displayed, and a processing load can be reduced as compared with a case where a three-dimensional model is rendered and displayed in real time. In addition, the correspondence between the coordinates of the first rendered image and the coordinates of the first pattern can be appropriately set, and a shift in arranging a desired texture in the rendered image can be reduced.

  In such an image display method of the present invention, the step (a) uses the plurality of patterns corresponding to each bit position when the coordinates are expressed in binary numbers, and the bit value of the bit position corresponding to each pattern is a value. The first pattern is created by setting a first gradation value at a coordinate of 1 and setting a second gradation value different from the first gradation value at a coordinate whose bit value is 0 And using the same number of patterns, the second gradation value is set to the coordinates where the bit value of the bit position corresponding to each pattern is the value 1, and the bit value is the coordinates of the value 0. The second pattern may be created by setting gradation values, and the created pattern may be pasted on the three-dimensional model and rendered. By doing this, it is possible to set the correspondence between the coordinates of the rendered image and the coordinates of each pattern only by determining whether each coordinate of the rendered image is the first gradation value or the second gradation value. . In this aspect of the image display method of the present invention, the first gradation value is larger than the second gradation value, and the step (a) is performed for each pattern corresponding to each bit position. , The coordinates where the tone value of the part where the pattern of the first rendered image is pasted are larger than the tone value of the part where the corresponding pattern of the second rendered image is pasted. Is the coordinate of the value 1, and the gradation value of the part where the pattern of the first rendered image is pasted is the gradation of the part where the corresponding pattern of the second rendered image is pasted It may be a step of setting the correspondence relationship by determining the coordinates below the value as the coordinates having the bit value of 0. In these cases, the binary number may be an alternating binary number. In this way, since only 1-bit change always occurs when moving to an adjacent coordinate, it is possible to suppress erroneous data from being acquired due to an error in the gradation value of the image.

  In the image display method of the present invention, the step (a) further creates a minimum gradation value pattern in which a minimum gradation value is set, and pastes the created minimum gradation value pattern on the three-dimensional model. The step (b) stores a bias value that is a gradation value in the rendered image obtained by rendering the minimum gradation value pattern as the image drawing information, and the step (c) The gradation value of the desired texture may be offset based on the stored bias value to be converted into the gradation value of the rendered image and displayed. By doing this, it is possible to reflect the effect of rendering the three-dimensional model that does not depend on the original texture.

  Further, in the image display method of the present invention, the step (a) further creates a minimum gradation value pattern in which a minimum gradation value is set and a maximum gradation value pattern in which a maximum gradation value is set, and The minimum gradation value pattern and the maximum gradation value pattern are pasted and rendered on the three-dimensional model for each pattern, and the step (b) includes rendering the minimum gradation value pattern and the maximum gradation value. A gain that is a deviation between the gradation value of the maximum gradation value pattern and the gradation value of the maximum gradation value pattern in the rendered image obtained by each pattern rendering is calculated and stored as the image drawing information. The step (c) converts the gradation value of the desired texture into the gradation value of the rendered image based on the stored gain. It can also be assumed to be. In this way, it is possible to reflect the effect of the original texture gradation value among the effects of rendering the three-dimensional model. In the image display method of the present invention according to this aspect, the step (a) is arranged when a plurality of desired textures are arranged and displayed on the first rendered image in the step (c). A set group provided with the number of desired textures, each set including one maximum gradation value pattern and the minimum gradation value pattern obtained by subtracting the value 1 from the number of textures to be arranged; A first set group including a first set group in which the minimum gradation value pattern is pasted on the three-dimensional model for each set, and one minimum gradation value pattern equal in number to the desired texture to be arranged. Each set of 2 is pasted and rendered on the three-dimensional model, and the step (b) records the first set group for each set. Comparing the tone value of each rendered image obtained by dulling with the tone value of the rendered image obtained by rendering the second set for each set of the first set group. Thus, a texture region that is a region where a texture is pasted on the three-dimensional model can be specified, and the gain can be calculated for the specified texture region. In these cases, in the step (a), the first and second patterns are rendered by a first rendering process, and the minimum gradation value pattern and the maximum gradation value pattern are rendered by the first rendering process. Can also be a step of rendering by a low quality second rendering process. In this way, the time required for the rendering process can be shortened.

  In the image display method of the present invention, an image can be drawn in units of frames and displayed as a moving image.

The block diagram which shows the outline of a structure of the computer 20 used for the image display method. The flowchart which shows an example of a special texture production | generation process. Explanatory drawing which shows an example of a special texture. Explanatory drawing which shows a mode that a special texture is rendered for every set. 10 is a flowchart illustrating an example of rendered image analysis processing. Explanatory drawing explaining bias Bc, t (x, y) and gain Gc, t (x, y). Explanatory drawing explaining bias Bc, t (x, y) and gain Gc, t (x, y). Explanatory drawing which shows the relationship between each gradation value of a vertical stripe pattern and a reverse vertical stripe pattern. Explanatory drawing which shows an example of the texture for replacement. Explanatory drawing which shows an example of the slide show display of the texture for replacement. Explanatory drawing which shows the special texture of a modification.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram showing an outline of the configuration of a computer 20 and a viewer 40 used in an image display method according to an embodiment of the present invention. The computer 20 of this embodiment is a general-purpose computer comprising a central processing unit (CPU), a ROM for storing processing programs, a RAM for temporarily storing data, a graphic processor (GPU), a hard disk (HDD), a display 22 and the like. It is configured as a computer, and its functional blocks include 3D modeling data (hereinafter referred to as 3D model), texture data (hereinafter referred to as texture) to be pasted on this, and a 3D model. A special texture generation processing unit 32 that generates a special texture for preprocessing to be pasted, a rendering processing unit 34 that generates a bitmap image by rendering a three-dimensional model, and a renderin as a bitmap image obtained by rendering It includes a rendered image analysis processing section 36 for the finished image analysis, the.

  The special texture generation processing unit 32 is a processing unit that generates a predetermined pattern of texture to be pasted on the 3D model rendered by the rendering processing unit 34. Specifically, as the predetermined pattern, a value of 0.0 to 1.0 is used. A solid white pattern with a gradation value of 1.0 within a gradation value range, a black solid pattern with a gradation value of 0.0, and a gradation value of 0.0 and 1.0 A vertical stripe pattern that appears alternately in the horizontal direction, an inverted vertical stripe pattern that is an inversion of this vertical stripe pattern, a horizontal stripe pattern in which the gradation values 0.0 and 1.0 appear alternately in the vertical direction, and this horizontal stripe A pattern of an inverted horizontal stripe pattern in which the pattern is inverted is generated. The role of each pattern will be described later.

  The rendering processing unit 34 is a processing unit that functions when software for 3D rendering is installed in the computer 20. By rendering the 3D model by pasting the texture generated by the special texture generation processing unit 32, rendering is performed. A bitmap image is reproduced in units of frames at a predetermined frame rate (for example, 30 times or 60 times per second) to display a moving image. In the present embodiment, the rendering process is performed using a ray tracing method that calculates and renders reflection of an object surface, light refraction, and the like while tracing light from a light source.

  The rendered image analysis processing unit 36 analyzes the bitmap image (rendered image) generated by the rendering processing unit 34, and arranges and renders desired image data such as a photograph instead of a predetermined pattern texture. Image drawing information is generated for displaying the completed image on the viewer 40 side.

  The viewer 40 of the present embodiment arranges a desired texture on the rendered image of the 3D model, and a storage unit 41 that stores image rendering information as a result analyzed by the rendered image analysis processing unit 36 of the computer 20. A display processing unit 42 that displays images by drawing and a memory card controller 44 that manages data exchange with a memory card 46 that stores image data such as photographs. The viewer 40 sequentially reads a plurality of image data stored in the memory card 46 according to an instruction from the user, and pastes the read image data on the rendered image of the 3D model using image drawing information, and sequentially reproduces the image data. The slide show to be performed can be performed.

  Next, the operations of the special texture generation processing unit 32, the rendering processing unit 34, and the rendered image analysis processing unit 36 of the computer 20 configured as described above, and the operation of the display processing unit 42 of the viewer 40 will be described. First, the processing of the special texture generation processing unit 32 will be described. FIG. 2 is a flowchart illustrating an example of the special texture generation process.

  In the special texture generation process, first, the target set number i is initialized to a value 1 (step S100), and n special textures are generated for each RGB color component for the target set number i (step S110). The target set number i is incremented by 1 (step S120), the target set number i is compared with the value n (step S130), and when the target set number i is less than or equal to the value n, the process returns to step S110 and the next target The process of generating n special textures for the set number i is repeated. When the target set number i exceeds the value n, the process proceeds to the next process. Here, the generation of the special texture with the target set number i from the value 1 to the value n shifts the target texture number j from the first to the nth by the value 1 from the first as shown in the following equation (1). While comparing the target texture number j and the target set number i, the target texture number j that matches the target texture number j is in the gradation value range from the minimum value 0.0 (black) to the maximum value 1.0 (white). A special white solid texture is generated by setting a gradation value of 1.0 to all coordinates (x, y), and the target texture number j that does not match is set to all coordinates (x, y). This is done by generating a solid black special texture by setting a gradation value of 0.0. Here, “c” in the formula (1) indicates a value corresponding to each color of the RGB values of the image data, “n” indicates the number of textures arranged on one screen, and “b” indicates the texture coordinates. Indicates the number of bits when expressed as a binary number, and “Tc, i, j (x, y)” indicates the coordinates (x, y) of the special texture in the color component c, the target set number i, and the target texture number j. Indicates a gradation value (hereinafter the same).

  When the special texture having the target set number i having the value 1 to the value n is generated, n special textures for each color component having the target set number i having the value (n + 1) are generated (step S140). i is incremented by 1 (step S150). Here, the generation of the special texture having the target set number i of the value (n + 1) is performed with respect to all the target texture numbers j from 1 to n as shown in the following equation (2). This is done by generating a solid black special texture by setting a gradation value of 0.0 to y).

  When the special texture having the target set number i of the value (n + 1) is generated, the {i− (n + 2)} th when the texture coordinates are expressed as an alternating binary number (gray code) for the target set number i. N special textures for each color component of the vertical stripe pattern corresponding to the bit are generated by the following equation (3) (step S160), the target set number i is incremented by 1 (step S170), and the target set number i Is compared with the value (n + b + 1) (step S180), and when the target set number i is equal to or smaller than the value (n + b + 1), the process returns to step S160 to generate n special textures for the next target set number i. Repeatedly, when the target set number i exceeds the value (n + b + 1), the process proceeds to the next process. Here, “gray (a)” in the expression (3) is a Gray code representation of the numerical value “a”, and “and (a, b)” indicates a logical product of bits a and b (hereinafter the same). . The target set numbers i from (n + 2) to (n + b + 1) are the 0th bit (most significant bit) to the (b-1) th bit (least significant bit) when the texture coordinates are expressed in binary numbers, respectively. When the value of the bit corresponding to the target set number i is 1, the gradation value of 1.0 (white) is set, and the value of the corresponding bit is 0. Sometimes a special texture with a vertical stripe pattern is generated by setting a gradation value of 0.0 (black). In this embodiment, the texture coordinates are expressed in alternating binary numbers. For example, if the texture number n is 3 and the coordinates are 3 bits (b = 3), the target set number i is the first number. As a special texture with a value of 5 indicating 0 bit (most significant bit), a black gradation value is set for an x coordinate value of 1 to 4, a white gradation value is set for a value of 5 to 8, and a target set is set. As for the special texture having the value 6 in which the number i indicates the first bit, the black coordinate value is set for the x coordinate values 1 and 2, the white tone value is set for the values 3 to 6, and the values 7 and 8 are set. Is a black gradation value, and the target set number i is a special texture with a value 7 indicating the second bit (least significant bit). For 3 the white tone value is set and for values 4 and 5 So that the black gradation value is set for the gradation value set value 8 white for black gradation value set value 6,7.

  When the special texture having the target set number i of the value (n + 2) to the value (n + b + 1) is generated, the {i− (n + b + 2) th when the x coordinate of the texture is represented by the Gray code expression with respect to the target set number i. } N special textures for each color component of the vertical stripe pattern corresponding to the bit are generated by the following equation (4) (step S190), the target set number i is incremented by 1 (step S200), and the target set number i is compared with the value (n + 2b + 1) (step S210). When the target set number i is equal to or smaller than the value (n + 2b + 1), the process returns to step S190 to generate n special textures for the next target set number i. And when the target set number i exceeds the value (n + 2b + 1), the process proceeds to the next process. As can be seen from the equation (4), this processing generates a special texture of the inverted vertical stripe pattern obtained by inverting the white of the vertical stripe pattern special texture generated in steps S160 to S180 described above to black and black to white. .

  When the special texture having the target set number i of the value (n + b + 2) to the value (n + 2b + 1) is generated, the {i− (n + 2b + 2)} when the y coordinate of the texture is represented by the Gray code expression with respect to the target set number i. } N special textures for each color component of the horizontal stripe pattern corresponding to the bit are generated by the following equation (5) (step S220), the target set number i is incremented by 1 (step S230), and the target set number i is compared with the value (n + 3b + 1) (step S240), and when the target set number i is equal to or smaller than the value (n + 3b + 1), the process returns to step S220 to generate n special textures for the next target set number i. And when the target set number i exceeds the value (n + 3b + 1), the process proceeds to the next process. The target set numbers i from (n + 2b + 2) to (n + 3b + 1) are the 0th bit (most significant bit) to the (b-1) th bit (least significant bit) when the texture coordinates are expressed in binary numbers, respectively. The gradation value of 1.0 (white) is set when the value of the bit corresponding to the target set number i is 1, and the value of the corresponding bit is 0. A special texture with a horizontal stripe pattern is generated by setting a gradation value of 0.0 (black). In this embodiment, the texture coordinates are expressed in gray code. For example, if the texture number n is 3 and the y coordinate is 3 bits (b = 3), the target set number i is the first number. As a special texture of value 8 indicating 0 bit (most significant bit), a black gradation value is set for values 1 to 4 and a white gradation value is set for values 5 to 8, and the target set is set. As for the special texture with the number 9 indicating the first bit as the number i, a black gradation value is set for the y coordinate values 1 and 2, and a white gradation value is set for the values 3 to 6, and the values 7 and 8 are used. As for a special texture having a value 10 indicating that the target set number i indicates the second bit (least significant bit), a black gradation value is set for a value 1 and a black gradation value is set. , 3 are set to white gradation values and values 4, 5 For so that black gradation value is set for the gradation value set value 8 white for black gradation value set value 6,7.

  When a special texture having the target set number i of the value (n + 2b + 2) to the value (n + 3b + 1) is generated, when the y coordinate of the texture is expressed as a gray code expression for the target set number i, the {i− (n + 3b + 2) th } N special textures for each color component of the horizontal stripe pattern corresponding to the bit are generated by the following equation (6) (step S250), the target set number i is incremented by 1 (step S260), and the target set number i is compared with the value (n + 4b + 1) (step S270). When the target set number i is equal to or smaller than the value (n + 4b + 1), the process returns to step S250 to generate n special textures for the next target set number i. When the target set number i exceeds the value (n + 4b + 1), all special textures are generated. As was completion, the process is terminated. As can be seen from the equation (6), this processing generates a special texture of inverted vertical stripe pattern in which white of the horizontal stripe pattern special texture generated in steps S220 to S240 described above is inverted from black to black. . FIG. 3 shows a list of special textures generated when the number of textures n is 3 and the number of coordinate bits b is 3.

  For each set, the rendering processing unit 34 performs rendering processing by pasting the corresponding n special textures onto the three-dimensional model. The rendering process is performed for a set whose set number i is a value from 1 to (n + 1) with an image quality enhancement process such as anti-aliasing, and a set whose i is a value from (n + 2) to a value (n + 4b + 1). It was assumed that the processing was disabled. FIG. 4 shows the rendering process. In this embodiment, since the three-dimensional model is rendered as a moving image, the number of textures n is 3 and the number of bits b is 3, the total 16 sets of rendering processing are performed and 16 sets of moving images are generated. Will be. This moving image is composed of bitmap images (rendered images) generated for each frame from frames 1 to T.

  Next, processing for analyzing a rendered image generated by the rendering processing unit 34 will be described. FIG. 5 is a flowchart illustrating an example of a rendered image analysis process executed by the rendered image analysis processing unit 36.

  In the rendered image analysis process, first, the variable It (x, y) of the coordinates (x, y) of the rendered image at each frame number t (= 1 to T) is set to the value 0 as shown in the following equation (7). (Step S300), a white solid area (coordinates) in the rendered image of the set numbers 1 to n in the target frame t is specified, and the variable It (x, y) of this white solid area is corresponded. A texture number (= target set number i) is set (step S310). As shown in the following equation (8), this processing is performed by sequentially shifting the target set number i from the first to the nth, and the gradation value of the rendered image of the target set number i (the gradation value for each color component). This can be done by comparing the sum of the tone values of the rendered image with the set number (n + 1) (the sum of the tone values for each color component). Here, “w” in Expression (7) indicates the size in the width direction of the rendered image, and “h” indicates the size in the height direction of the rendered image (the same applies hereinafter). In addition, “Ac, i, t (x, y)” in Expression (8) is a rank of the coordinate (x, y) of the rendered image at the color component c, the set number i (1 to n), and the frame number t. Indicates the key value (hereinafter the same).

  Subsequently, the gradation value of the rendered image with the set number (n + 1) is set as the bias Bc, t (x, y) by the following equation (9) (step S320), and the variable It (x, y) is a value. The gain Gc, t (x, y) is calculated by the following equation (10) for the coordinates (x, y) of the rendered image that is not 0, that is, the white solid region (step S330). Here, “Ac, It (x, y), t (x, y)” in the expression (10) is the color component c and the set number i and the frame number t stored in the variable It (x, y). Indicates the gradation value of the coordinates (x, y) of the rendered image. 6 and 7 show the relationship between the bias Bc, t (x, y) and the gain Gc, t (x, y). When rendering with a texture attached to the 3D model, as shown in the figure, the gradation value at the coordinates (x, y) after rendering the black solid pattern becomes the bias Bc, t (x, y), and the white solid pattern The gain Gc, t (x, y) is obtained by subtracting the gradation value at the coordinate (X, Y) after rendering of the black solid pattern from the gradation value at the coordinate (x, y) after rendering. This is because the offset that does not depend on the tone value of the original texture corresponds to the bias Bc, t (x, y), and the gradient of the change in the tone value of the rendered image relative to the change in the tone value of the original texture Corresponds to the gain Gc, t (x, y).

  Then, the coordinates (X't (x, y), Y't (x, y)) of the texture gray code expression are initialized to the value 0 by the following equation (11) (step S340), and the set number (n + 2) The coordinates (x, y) of the rendered image of the inverted vertical stripe pattern of (n + b + 2) to (n + 2b + 1) corresponding to the gradation value of the coordinate (x, y) of the rendered image of the vertical stripe pattern of (n + b + 1) The gradation value is compared (step S350), the correspondence between the coordinates (x, y) of the rendered image and the coordinates X't (x, y) of the texture is set (step S360), and the set number is set. The coordinates (x, y) of the inverted horizontal stripe pattern of the set number (n + 3b + 2) to (n + 4b + 1) corresponding to the gradation value of the coordinate (x, y) of the horizontal stripe pattern rendered image of (n + 2b + 2) to (n + 3b + 1) Compare the tone value of y) S370), the correspondence between the coordinates (x, y) of the rendered image and the coordinates Y't (x, y) of the texture is set (step S380). Here, the processing of steps S350 to S380 is performed by the following equation (12). The setting of the correspondence between the coordinates (x, y) of the rendered image and the coordinates X't (x, y) of the texture is set by sequentially shifting the variable i from the value 1 to the value b (bit number of coordinates). The gradation value Ac, i + b of the rendered image with the set number (i + b + n + 1) corresponding to the inverted pattern is the gradation value Ac, i + n + 1, t (x, y) of the rendered image with the number (i + n + 1). Depending on whether it is larger than + n + 1, t (x, y), that is, the gradation value Ac, i + n + 1, t (x, y) of the rendered image of the set number (i + n + 1) is white In the case of white, the value 1 is set to the bit value of the (i−1) -th bit corresponding to the coordinates X′t (x, y) in the gray code expression. It is. The correspondence between the rendered image coordinate (x, y) and the texture coordinate Y't (x, y) is set by sequentially shifting the variable i from the value 1 to the value b, with the set number (i + 2b + n + 1). Gradation value Ac, i + 2b + n + 1, t (x, y) of the rendered image of gradation value Ac, i + 3b + n of the rendered image of the set number (i + 3b + n + 1) corresponding to the reverse pattern Depending on whether it is larger than + 1, t (x, y), that is, the gradation value Ac, i + 2b + n + 1, t (x, y) of the rendered image of the set number (i + 2b + n + 1) is white And in the case of white, the value 1 is set to the bit value of the (i−1) -th bit corresponding to the coordinates Y′t (x, y) in the gray code expression. It is. Here, “or (a, b)” in the equation (12) indicates a logical sum of bits a and b. FIG. 8 is an explanatory diagram showing the relationship between the gradation values of the vertical stripe pattern and the inverted vertical stripe pattern. The correspondence between the rendered image coordinates (x, y) and the texture coordinates (X't (x, y), Y't (x, y)) Rendering of rendered image gradation value Ac, i + n + 1, t (x, y) rendered set number (i + n + 1) and horizontal stripe pattern set number (i + 2b + n + 1) The gradation value Ac, i + 2b + n + 1, t (x, y) of the finished image is determined by determining whether it corresponds to white. Depending on the situation, the original white color may be close to gray or black. In this case, the color may be erroneously determined. In the present embodiment, an inverted vertical striped pattern having a set number (i + b + n + 1) and a inverted horizontal striped pattern having a set number (i + 2b + n + 1) having a variable i of values 1 to b are created and rendered, and these inverted vertical striped patterns are rendered. Rendering of rendered image with gradation values Ac, i + n + 1, t (x, y) and horizontal stripe pattern rendered as a contrast between vertical stripe pattern and reverse horizontal stripe pattern (see Fig. 8) Since it is determined whether or not the gradation value Ac, i + 2b + n + 1, t (x, y) of the completed image corresponds to white, it is possible to prevent erroneous color determination.

  When the correspondence of coordinates is set in this way, the texture coordinates (X't (x, y), Y't (x, y)) of the gray code representation are decoded using the following equation (13) and decoded. The coordinates (Xt (x, y), Yt (x, y)) are calculated (step S390), and the settings or calculation results so far are stored in the storage unit 31 as image drawing information (step S400). It is determined whether or not the processing has been completed for all the frames up to T (step S410). If the processing has not been completed for all the frames, the next frame is set as the target frame t and the processing returns to step S300 to repeat the processing. When the processing is completed for all frames, this processing is terminated. Here, “gray-1 (a)” in Expression (13) indicates a value obtained by decoding the Gray code a, and “Xt (x, y)” indicates the coordinates (x, y) represents the x coordinate of the texture, and “Yt (x, y)” represents the y coordinate of the texture corresponding to the coordinate (x, y) of the rendered image of frame number t. In this embodiment, since the origin of the coordinates (X′t (x, y), Y′t (x, y)) is (1,1), the value 1 is set to the value obtained by decoding the Gray code. It is adding. The image drawing information includes a variable It (x, y), bias Bc, t (x, y), gain Gc, t (x, y), and coordinates (Xt (x, y), Yt (x, y) )).

  In the display processing unit 42 of the viewer 40, the rendered image (bitmap image) generated by the rendering processing unit 34 of the computer 20 and the image drawing information generated by the rendered image analysis processing unit 36 are stored in the storage unit 41 in advance. If stored, a plurality of image data such as photographs stored in the memory card 46 is read as a replacement texture, and is synthesized into a rendered image using the following equation (14) and sequentially drawn to create a texture. It is possible to perform a slide show reproduction that displays the rendered image of the three-dimensional model while replacing. Here, “Uc, i (x, y)” in Expression (14) is the tone value (0.0 to 1.0) of the coordinate (x, y) of the replacement texture in the color component c and texture number i. "Pc, t (x, y)" indicates the gradation value (0.0 to 1.0) of the coordinates (x, y) of the display image (rendered image) in the color component c and frame number t. Indicates. As shown in the equation (14), the gradation value Pc, t (x, y) of the display image is set with respect to the texture arrangement region in which the variable It (x, y) is not 0 (the coordinate of the display image ( Bias Bc, t (x) by multiplying the tone value of the replacement texture coordinate (Xt (c, y), Yt (x, y)) corresponding to x, y) by the gain Gc, t (x, y) , y) is set, and a bias Bc, t (x, y) is set for a region other than the texture placement region in which the variable It (x, y) is 0. FIG. 9 shows three replacement textures having texture numbers 1 to 3, and FIG. 10 shows a state in which the replacement texture of FIG. 9 is arranged and rendered on the rendered image.

  According to the image display method of the present embodiment described above, on the computer 20 side, white and black vertical stripe patterns for the x coordinate corresponding to the value of each bit when the coordinates (x, y) are expressed in binary numbers are used. Paste the pattern and the corresponding inverted vertical stripe pattern, the white and black horizontal stripe pattern for y-coordinate and the corresponding inverted horizontal stripe pattern to the 3D model as a texture, and render by rendering. Compare the vertical stripe pattern and the inverted vertical stripe pattern in the rendered image obtained as a bitmap image, and compare the horizontal stripe pattern and the inverted horizontal stripe pattern to the vertical stripe pattern and horizontal stripe pattern. The coordinates (x, y) of the rendered image and the texture coordinates (Xt (x, y), Yt (x, y)) is set and saved as image drawing information. When an image is displayed using the rendered image on the viewer 40 side, texture coordinates (Xt Since rendering is performed at the coordinates (x, y) of the display image based on the gradation values of (x, y), Yt (x, y)), the rendered image of the three-dimensional model can be freely replaced and played. In addition, the processing load can be reduced as compared with the case where the three-dimensional model is rendered and displayed in real time. At this time, since the color (white) of the vertical stripe pattern for x-coordinate and horizontal stripe pattern for y-coordinate after rendering is determined by comparison with the inverted vertical stripe pattern and the inverted horizontal stripe pattern, the coordinates of the rendered image The correspondence between (x, y) and the texture coordinates (Xt (x, y), Yt (x, y)) can be set accurately. Distortion and the like can be suppressed. In addition, since the tone value of the texture is converted by using the gain Gc, t (x, y) and the bias Bc, t (x, y) and the tone value of the display image is set, the three-dimensional model is rendered. It is also possible to reflect the effects of refracted light, specular reflection, and shadows. Furthermore, since a vertical striped pattern and a horizontal striped pattern corresponding to alternating binary numbers are formed as a special texture for specifying the correspondence of coordinates, a change of 1 bit always occurs when moving to adjacent coordinates. Therefore, it is possible to suppress erroneous data from being acquired due to an error in the gradation value of the image. In addition, as rendering processing, the set number i for setting the bias Bc, t (x, y) and the gain Gc, t (x, y) has a high image quality such as anti-aliasing for a set whose value is 1 to (n + 1). If the set number i is a value (n + 2) to a value (n + 4b + 1) that only needs to be determined for color (monochrome) in order to set the coordinate correspondence, the image quality improvement processing is invalidated. Thus, the time required for rendering can be shortened while ensuring the image quality.

  In the present embodiment, the special texture of the vertical stripe pattern whose target set number i is a value (n + 2) to a value (n + 2b + 1) corresponds to the value of each bit when the coordinates are expressed in alternating binary numbers, and the target set number The special texture of the horizontal stripe pattern with i being the value (n + 2b + 2) to the value (n + 4b + 1) corresponds to the value of each bit when the coordinates are expressed in alternating binary numbers. It may be generated as a value corresponding to the value of each bit when expressed in decimal. An example of the special texture in this case is shown in FIG.

  In the present embodiment, as a rendering process, a set with a set number i having a value of 1 to (n + 1) is performed with an image quality enhancement process such as anti-aliasing, and the set number i is a set with a value (n + 2) to a value (n + 4b + 1). However, it is also possible to perform rendering processing with high image quality processing, or perform low quality rendering processing without high image quality processing. It may be done.

  In the present embodiment, an image is reproduced by the viewer 40, but any device such as a mobile phone with a liquid crystal screen or a printer may be used as long as the device can reproduce an image.

  It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that the present invention can be implemented in various modes as long as it belongs to the technical scope of the present invention.

  20 Computer, 22 Display, 31 Storage unit, 32 Special texture generation processing unit, 34 Rendering processing unit, 36 Rendered image analysis processing unit, 40 Viewer, 41 Storage unit, 42 Display processing unit, 44 Memory card controller, 46 Memory card .

Claims (9)

An image display method for displaying an image,
(A) A first pattern in which different gradation values are set for each coordinate and a second pattern in which the gradation values of the first pattern are inverted are created, and the created first pattern and second pattern are created. Paste the pattern as a texture on the 3D model and render each.
(B) The gradation value of the first rendered image obtained as a bitmap image by rendering the first pattern and the second rendered image obtained as a bitmap image by rendering the second pattern By comparing the gradation value for each coordinate, the correspondence between the coordinates of the rendered image and the coordinates of the pattern is set and stored as image drawing information,
(C) An image display method in which when a desired texture is displayed as an image, the desired texture is arranged and displayed in the rendered image based on the stored image drawing information.   The step (a) uses a plurality of patterns corresponding to each bit position when the coordinates are expressed in binary numbers, and the bit value of the bit position corresponding to each pattern is the first gradation at the coordinates of the value 1 The first pattern is created by setting a value and setting a second gradation value different from the first gradation value at the coordinates where the bit value is 0, and using the same number of patterns By setting the second gradation value at the coordinate where the bit value of the bit position corresponding to each pattern is the value 1, and setting the first gradation value at the coordinate where the bit value is the value 0, The image display method according to claim 1, wherein the second pattern is created, and each of the created patterns is pasted on the three-dimensional model and rendered. The image display method according to claim 2,
The first gradation value is larger than the second gradation value,
In the step (a), for each pattern corresponding to each bit position, a gradation value of a portion where the pattern of the first rendered image is pasted is a pattern corresponding to the second rendered image. Coordinates larger than the gradation value of the pasted part are determined as coordinates having a bit value of 1, and the gradation value of the part where the pattern of the first rendered image is pasted is the second value. An image display method, which is a step of setting the correspondence relationship by determining coordinates below a gradation value of a portion where a corresponding pattern of a rendered image is pasted as a coordinate having a bit value of 0.   4. The image display method according to claim 2, wherein the binary number is an alternating binary number. The image display method according to any one of claims 1 to 4,
The step (a) further creates a minimum gradation value pattern in which a minimum gradation value is set, and renders the created minimum gradation value pattern by pasting it on the three-dimensional model,
The step (b) stores a bias value, which is a gradation value in a rendered image obtained by rendering the minimum gradation value pattern, as the image drawing information.
The step (c) is an image display method in which the gradation value of the desired texture is offset based on the stored bias value to be converted into the gradation value of the rendered image and displayed. The image display method according to any one of claims 1 to 5,
The step (a) further creates a minimum gradation value pattern in which a minimum gradation value is set and a maximum gradation value pattern in which a maximum gradation value is set, and the minimum gradation value pattern and the maximum gradation value Each value pattern is pasted and rendered on the 3D model for each pattern,
The step (b) includes the gradation value of the maximum gradation value pattern and the maximum gradation value pattern in the rendered image obtained by rendering the minimum gradation value pattern and the rendering of the maximum gradation value pattern, respectively. A gain that is a deviation from the tone value of the image is calculated and stored as the image drawing information,
The step (c) is an image display method in which the gradation value of the desired texture is converted into the gradation value of the rendered image based on the stored gain and displayed. The image display method according to claim 6,
In the step (a), when a plurality of desired textures are arranged and displayed on the first rendered image in the step (c), a set group provided by the number of the desired textures to be arranged. Each set includes one maximum gradation value pattern and the minimum gradation value patterns obtained by subtracting the value 1 from the number of textures to be arranged, and the minimum is added to the three-dimensional model for each set. The first set group in which the place where the gradation value pattern is pasted is different from the first set group including the minimum number of gradation value patterns of the same number as the desired number of textures to be arranged. Render by pasting on a dimensional model,
The step (b) includes the gradation value of each rendered image obtained by rendering the first set group for each set and the level of the rendered image obtained by rendering the second set. By comparing the tone value for each set of the first set group, a texture region that is a region where a texture is pasted on the three-dimensional model is specified, and the gain is determined with respect to the specified texture region. Image display method to calculate   In the step (a), the first and second patterns are rendered by a first rendering process, and the minimum gradation value pattern and the maximum gradation value pattern are rendered with lower quality than the first rendering process. The image display method according to claim 6, wherein the image display method is a step of rendering by a second rendering process.   The image display method according to claim 1, wherein the image is displayed in a frame unit and displayed as a moving image.