Color converting device and method, image forming apparatus, program and recording medium

A color conversion and image technology, applied in the direction of image communication, electrical components, etc., can solve the problem that the memory cannot be effectively used

Inactive Publication Date: 2007-11-21
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, since there is data redundancy between multiple tables, there arises a problem that memory cannot be effectively utilized

Method used

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  • Color converting device and method, image forming apparatus, program and recording medium
  • Color converting device and method, image forming apparatus, program and recording medium
  • Color converting device and method, image forming apparatus, program and recording medium

Examples

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Embodiment 1

[0080] FIGS. 1A and 1B are block diagrams showing an example of a color conversion device 10 of the present invention, and FIG. 1B is continuous with FIG. 1A . The color conversion device 10 includes: a data conversion unit 12 (first data conversion unit) to which image data represented by 8-bit R, G, and B components is input; a bit separation unit 14 (second data conversion unit) to which Input the data that will be described later from the data conversion unit 12; the table access unit 16 (second data conversion unit) to which the three-dimensional lookup table table (3DLUT) 18 is connected and input the data that will be described later from the bit separation unit 14 to it. and a three-dimensional interpolation processing unit 20 (second data conversion unit) to which data to be described later from the bit separation unit 14 and the table access unit 16 is input, and the three-dimensional interpolation processing unit 20 outputs the data represented by 8 bits The image d...

Embodiment 2

[0099]It is also possible to change the number of grid points to be increased or decreased according to the type of 3DLUT 18 (cyan, magenta, and yellow). For example, the number of grid points can be set according to the following formula:

[0100] Cyan 3DLUT 18c: 20(R’)×18(G’)×18(B’),

[0101] Magenta 3DLUT 18m: 18(R’)×20(G’)×18(B’), and

[0102] Yellow 3DLUT 18y: 18(R')×18(G')×20(B').

[0103] The complementary color of cyan is red, the complementary color of magenta is green, and the complementary color of yellow is blue. By increasing the number of grid points of the complementary color compared to other colors, high-precision conversion can be performed.

[0104] However, in this case, the data conversion unit 12 needs to be provided for each of cyan, magenta, and yellow. 4A and 4B are block diagrams showing an example of a color conversion device 10 including a cyan data conversion unit 12c, a magenta data conversion unit 12m, and a yellow data conversion unit 12y as...

Embodiment 3

[0107] FIG. 5 is a block diagram showing one example of the structure of the image forming apparatus 70 of the present invention. In this description, the image forming apparatus 70 functions as a digital color copier. The image forming apparatus 70 includes a color image processing device 31 , a color image input device 30 , a color image output device 32 , and an operation panel 33 connected to the color image processing device 31 . In addition, although not shown in FIG. 5 , the image forming apparatus 70 also includes a CPU (Central Processing Unit) for controlling each device in the image forming apparatus 70 .

[0108] The color image input device 30 includes a CCD (Charge Coupled Device), for example, reads an image of reflected light from a document by the CCD, and generates RGB analog signals. The generated RGB analog signals are sent to the color image processing device 31 .

[0109] The color image processing unit 31 includes an A / D (Analog / Digital) conversion uni...

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Abstract

The present invention provides a color converter for converting the input image data based on a plurality of first color constituents (the digit of each color constituent is k) into the output image data based on a plurality of color constituents through interpolation. Wherein, the interpolation is made by utilizing 3DLUT color correction value of storage grid points; the grid points are obtained by dividing the color space composed of a plurality of first color constituents; the distance of grid points is 2 (n is an integer smaller than k); the number of grid points Dn of the first color constituents is an integer satisfying 2+1 less than Dn less than 2< m+1>+1(in the formula, Dn is not equal to 2< m >+1, m is equal to k-n). The present invention converts each color constituent of the input image data through a data conversion unit according to the grid points, makes interpolation by using the corresponding color correction value of the converted color constituent read from 3DLUT, and converts the input image data to the output image data.

Description

technical field [0001] The present invention relates to: a color conversion device and a color conversion method for converting input image data based on a plurality of first color components into output image data based on a plurality of second color components; a method comprising the color conversion An image forming apparatus of the apparatus; a computer program for converting input image data based on a plurality of first color components into output image data based on a plurality of second color components; and a recording medium storing the computer program. Background technique [0002] In recent years, digital OA equipment has developed rapidly, and the demand for color image output is increasing. In general, electrophotographic type digital color copiers, inkjet type color printers, thermal conduction type color printers, etc. have been widely used. Image data such as image data input using an input device such as a digital camera or a scanner or image data create...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/60
Inventor 后藤牧生古市岳
Owner SHARP KK
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