JPH03127283A - Color picture processing system and processing system - Google Patents

Abstract

PURPOSE:To take in ruggedness information of an object surface in such form even in the case of irregular distribution of the ruggedness of the object surface that this information can be used in a system by obtaining ruggedness information of the object surface based on brightness information extracted from input picture data. CONSTITUTION:A texture processing part of the color picture processing system consists of an input device 1, a color converting circuit 2, an emphasis filter 3, a picture data control system 5, a color and pattern generating device 6, a data selecting circuit 9, buffer circuits 10 and 11, a weighting circuit 11, a color inverse converting circuit 13, and a form converting circuit 14. Only brightness information is extracted from an inputted color picture by coordinate transformation and is emphasized and compensated, and results are used as ruggedness information of the object surface. Thus, ruggedness information is taken in such form that it can be used in the system though the distribution of ruggedness of the object surface is irregular.

Description

[Detailed description of the invention] Industrial application field of the present invention (structure of database system for providing flexible image processing functions and realizing high-quality image generation with material appearance in computer graphics) Related to color image processing methods and processing systems that are related to conventional technology G↓ In the field of computer graphics A system that aims to generate realistic images by incorporating technology used in conventional image processing Although it is desired to develop
One example is the pattern or fine irregularities on the surface of an object.
There are two ways to use these methods: one is to attach a pattern to the surface of an object that has already been modeled, and the other is to cut out the texture based on a three-dimensionally defined texture and find the pattern on the surface.The latter method (Although it is called bump mapping below, I will explain bump mapping below.) In this case, the normal line during shading is tilted to match the unevenness of the texture mapped on the surface of the EL object with bump mapping. is RG
Instead of B, it is necessary to calculate the normal (three-dimensional vector) during force mapping, which requires only one element (one-dimensional vector) representing the unevenness. It is also possible to create a texture with normal lines in advance and map it directly.In this case, the amount of texture data increases three times, but the problem that the invention aims to solve.However, the above method does not allow for mapping. It deals only with processing, and texture generation (above).
They have not provided any means.1. % If the unevenness of the texture is distributed regularly, that is, a board.If the texture can be artificially created, there is no problem.Wall materials, carpets, wood grain, etc., where the unevenness of the surface is not regularly distributed. In view of the above-mentioned problems, the present invention has the problem of how to generate the texture of an object.The present invention is based on the problem of how to generate the texture of an object. This technology provides flexible image processing and image generation technology by independently (in a form that does not depend on each other) the unevenness information and color information that are imported into the system without deteriorating them.

Means for Solving the Problems In order to solve the above problems, the color image processing system of the present invention (Firstly, only brightness information is extracted from a manually generated color image by coordinate transformation, and the result of emphasizing and compensating for this is extracted. It is used as unevenness information on the surface of the object. This unevenness information is combined with other color information to perform inverse transformation.
This method realizes a method of generating and resynthesizing images that express the material texture of objects.

Effect of the Invention By using the above-described method, the present invention makes it possible to incorporate unevenness information into a form that can be used within the system when the distribution of unevenness on the surface of an object is not regular. Furthermore, by managing the unevenness information and color information while maintaining their independence, and composing the two, it is possible to
Assuming that the material used to manually generate unevenness information was a pale yellow wall material, this example shows that it is possible to generate image data for a yellow-green or sky-blue wall material without impairing the material feel of the wall material. A color image processing system according to an embodiment of the present invention will be described below with reference to the drawings, but FIG. In Figure 1, l is an input device, 2 and 8 are color conversion siblings, and 3 is an emphasis filter.
4 is an image data storage device a 5 is an image data management system 6 is a color/pattern generator 7 is a color generator 9 is a data selection circuit $ 10 and 12 are buffer circuits 1i11
k 11 is the weighting circuit a 13 is the color inverse conversion circuit 14 is the shape conversion circuit.The operation of the color image processing system configured as above will be explained below using Fig. 1. Input devices such as image scanners
In this step, an image of the surface of the target object is input. In the case of this system, considering its purpose, it is not possible to select arbitrary images for input.
It must represent the texture of the material on the surface of the object, such as wall materials, carpets, fabrics, etc.It is meaningless to input images of general scenery or people.The color obtained with input device 1 Image data is expressed in the RGB coordinate system, and it is difficult to extract unevenness information as it is.
Perform coordinate transformation from the system to the H5V system. Here comes H, S,
V is the coordinate representing each component of color and lightness of the image.The color conversion circuit 2 is composed of a floating point arithmetic circuit.From the RGB system to the XYZ system, L'a° which is one of the H3V systems Even if the coordinates are transformed to the b° system, here ζ L
o represents V, and a′ and bo represent H and S. These series of transformations are given by the following equation: X = 0.6067x R + 0.1736x G +0
．． 2001x BY = 0.2988x R+ 0.
5868x G + 0.1144x B...(1)
Z: 0.0681x G + 1.1
150x BL”= 116X (Y/YW)
'''-16a °=500x ((X/XW)-(Y
/YW))”” (2)b”-200X((Y/YW
)-(Z/ZW))""Here, xw, yw, zw are the values of X1Y, Z for standard white, and X W
= 0.980be YW=1, 0OOQ, Z W
= 1.1812. In this embodiment, on ζ After this color conversion, V(L'') having brightness information is separated from other components and the V component is input to the emphasis filter circuit 3.The processing in this emphasis filter circuit 3 This not only corrects for image quality deterioration when inputting image data, but also emphasizes V to express the texture of the material. It is stored in the image data storage device 4. G and color information H3 may also be stored in this image data storage device 4.Of course, water of iiV' or only H3 may be stored in the image data storage device 4 in one image input process. Although it is possible to store both Vo and H3 at the same time, in this case Vo and H3 are managed completely independently. The image data management system 5 is positioned as a subsystem within the color image processing system in this embodiment.This image data management system 5 is composed of software and processing devices that realize the above functions.In this embodiment, ( Even if a color/pattern generator 6 is provided to generate not only information from the image actually used for input, but also arbitrary color information and unevenness information within the system, (by the color generation circuit 7) RGB system data is generated, and the color conversion circuit 8 converts the coordinates into the H8v system.
), using Equation (2), the color generation circuit 7 not only provides color information, but also unevenness information when the distribution of unevenness is regular. The output VT information is
It will be written as vn.

1 when the color image data is at the bottom Regarding color information (above) Power of using color information H3 in the image data storage device ＼ Data selection circuit 9 selects whether to use color information H8 generated in the color/pattern generator 6 Then, the selected one is stored in the buffer circuit IO, and the unevenness information on the other side is processed using the unevenness information V' stored in the image data storage device 4 and the unevenness information V'' generated by the color/pattern generator 6. Therefore, the weighting is performed in the circuit 11 by calculating the unevenness information V° used for color image generation using the following formula.
= tXV'+(1-t)XV'
---(3) Here, parameter t (0≦t≦1)
g;! , also given from the color/pattern generator 6
By performing this weighting, it is possible to calculate the difference between the unevenness information and the pattern. is regarded as brightness information. This and the color information H3 in the buffer circuit 11 are used to synthesize a color image. The process of performing the inverse transformation of the transformation shown in 2) generates a color image expressed in the RGB coordinate system.The color image thus obtained is used as a texture.In this case, the data obtained here and the object are Shape data and illuminance data etc. 6CR
The shape conversion circuit 14 performs processing such as enlargement and rotation on the texture data generated here in order to generate a color image to be displayed on an output device such as a T-shirt or printer, and to map it to the shape of an object. As described above, according to this embodiment, by providing a mechanism for color conversion to separate and separate the L\H8 component and the V component, the ability to express color images in terms of expressing the appearance of the material is expanded. be able to. In the above embodiment, the color coordinates are converted from the RGB system to the L'a″b° system.
It is also possible to convert to the U″V° system. In this case, the conversion is shown by the following formula: L”=116X(Y/Ys)””−16u”=13xL
"X(u'-us')...(4)v"=1
3XL"x(v'-vs') u'=(4XX)/(X+15XY+3xZ)v'=(
9X Y)/(X+15x y+3 X Z)...
(5) Here, Y '', u l ', and y @ ' are the values of Y s u and V' for standard white, respectively, and Y@ = 1.000. u' = o.

20L V'=0.461. The resistance is determined using equation (1).

Effects of the Invention As described above, the present invention (i.e., L
It is possible to incorporate the unevenness information into a form that can be used within the system. Also, by maintaining and managing the unevenness information and color information independently of each other, and by composing the two, various colors can be created using the same material. Image data of the surface of an object can be generated.

[Brief explanation of the drawing]

The figure is a configuration diagram of a texture processing section of a color image processing system in an embodiment of the present invention. 1... Input device 2... Color conversion circuit 3...
・Emphasis filter 4...Image data storage device 5・
...Image data management system 6..Color/pattern generator 7..Color generation cycle 8..Color conversion cycle 9..Data selection floor plan 10.. Regarding buffer times a 11XXY, Z

Claims (3)

[Claims] (1) From color image data input using an image input device, brightness information is extracted by applying color coordinate transformation, and the data obtained as a result of filtering and emphasizing this is used as unevenness information of the image data. A color image processing method characterized by the use of (2) Reproducing or generating color image data by combining the unevenness information according to claim 1 with color information of color image data input using an image input device or artificially created color information. A color image processing method characterized by: (3) Color image processing that uses the color image processing method according to claims 1 and 2 to generate data expressing the material texture of the object surface, and generates a color image from this data and the object shape data and illuminance data. system.