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Color image processing method, color image processor, color display, computer program for implementing the color image processing method

A color image and processing method technology, applied in color signal processing circuits, image data processing, image data processing, etc., can solve the problems of increased saturation of flesh color, reappearing to orange, etc., to enhance the sense of depth and clarity Effect

Inactive Publication Date: 2005-05-04
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] As a result, if an image that looks good on an ordinary transmission-type color display is reproduced by a color display excellent in color reproducibility, problems such as increased saturation of flesh color and reproduction of orange color occur

Method used

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  • Color image processing method, color image processor, color display, computer program for implementing the color image processing method
  • Color image processing method, color image processor, color display, computer program for implementing the color image processing method
  • Color image processing method, color image processor, color display, computer program for implementing the color image processing method

Examples

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no. 1 example

[0076] Initially, a color image processor and a color image processing method according to a first embodiment of the present invention will be described.

[0077] Fig. 6 is a block diagram showing the general configuration of the color image processor according to the first embodiment of the present invention.

[0078] As shown in FIG. 6, the color image processor 100 according to the first embodiment includes: saturation detection means 200, saturation conversion control means 300 and saturation conversion processing means 400.

[0079] The saturation detecting means 200 detects, for example, the saturation C normalized by the following processing from RGB signals of an original color image, and outputs it.

[0080] Specifically, for the RGB signals of an original color image, consider the saturation C in a 3-dimensional space defined along the axes of the three signals. As shown in Figure 3, in the displayable color range of RGB space, achromatic, white, black and gray are ...

no. 2 example

[0130] Next, a color image processor and a color image processing method according to a second embodiment of the present invention will be described.

[0131] Fig. 16 is a block diagram showing the general configuration of a color image processor according to a second embodiment of the present invention.

[0132] As shown in FIG. 16, the color image processor 105 according to the second embodiment includes saturation detection means 200, saturation conversion control means 302 and saturation conversion processing means 400.

[0133] The saturation detection means 200 and the saturation conversion processing means 400 operate in the same manner as the first embodiment described with reference to FIG. 6 .

[0134] The saturation conversion control means 302 calculates a converted saturation value C' based on the saturation C given from the saturation detection means 200 and a predetermined threshold α, and sends it to the saturation conversion processing means 400. The saturati...

no. 3 example

[0141] Next, a color image processor and a color image processing method according to a third embodiment of the present invention will be described.

[0142] Fig. 7 is a block diagram showing the general configuration of a color image processor according to a third embodiment of the present invention.

[0143] As shown in FIG. 7, a color image processor 101 according to the third embodiment includes: saturation detection means 200, saturation conversion control means 301, saturation conversion processing means 400 and threshold designation means 500.

[0144] The saturation detection means 200 and the saturation conversion processing means 400 operate in the same manner as the first embodiment described with reference to FIG. 6 .

[0145] The threshold specifying means 500 is constituted by, for example, a dedicated numerical input device such as a numeric keypad, or a multipurpose input device such as a PC keyboard. When the user inputs a desired threshold, the threshold spe...

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Abstract

Saturation detection means (200) detects saturation at each pixel of a digital color image or at each coordinate point of an analog color image. The saturation conversion control means (300) determines saturation conversion conditions of pixels or coordinate points according to the detected saturation. Saturation conversion processing means (400) implements saturation conversion in such a manner that the saturation is reduced for an area having low saturation in the color image in order to expand saturation relative to an area having high saturation difference, thus resulting in improved saturation contrast. Also, the saturation distribution of the input image is automatically extracted to determine a threshold for determining a saturation suppression area based on the saturation distribution. Thus, in order to obtain a color image with improved vividness and a sense of sharpness, the saturation contrast is automatically improved.

Description

technical field [0001] The present invention relates to a color image processing method, a color image processor, and a color display for increasing the depth perception, sharpness perception, etc. of a color image, and to a computer program for implementing the color image processing method. Background technique [0002] Conventionally, in image output devices such as monitors, printers, etc., sometimes in order to make an image more vivid than it appears to the eyes, there is often a case of enhancing saturation. Such saturation enhancement techniques are often used when dealing with images such as TV images, images acquired by scanners, etc. (which tend to be less saturated than their original images) to make the output more Close to the saturation of the original image. [0003] As an example of a saturation enhancement technique, an appropriate coefficient α (α>1) is determined so as to multiply the original saturation by α. [0004] According to this technique, ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G5/02H04N1/60
CPCG09G5/02H04N1/6005H04N1/6027
Inventor 大原明美
Owner SHARP KK
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