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Achromatic algorithm capable of maintaining contrast ratio, color consistency and gray pixel characteristics

A technology of pixel features and consistency, applied in the computer field, can solve the problem of no original image color consistency

Inactive Publication Date: 2014-12-24
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the current grayscale algorithm rarely considers the grayscale pixel characteristics, and none of the algorithms can well maintain the color consistency, contrast information and grayscale pixel characteristics of the original image at the same time.

Method used

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  • Achromatic algorithm capable of maintaining contrast ratio, color consistency and gray pixel characteristics
  • Achromatic algorithm capable of maintaining contrast ratio, color consistency and gray pixel characteristics
  • Achromatic algorithm capable of maintaining contrast ratio, color consistency and gray pixel characteristics

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Experimental program
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Embodiment

[0088] 1. First read a color image with a size of M×N. Since the data of the image itself is integer, and our calculation is for floating-point data, we first need to convert it into double-precision floating-point type;

[0089] 2. For each pixel of the entire image, use formula (3) to calculate its corresponding color contrast; then use formula (1) to calculate the contrast of the entire image to maintain the energy item;

[0090] δ xy = ( L x - L g ) 2 + ( a x - a g ) 2 + ...

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Abstract

The invention discloses an achromatic algorithm capable of maintaining the contrast ratio, color consistency and gray pixel characteristics. A contrast ratio maintaining energy item between pixel pairs is constructed through a double-Gauss model so as to maintain the structure and local contrast ratio information of an original image; meanwhile, a color consistency constraint energy item is constructed through a local linear embedding model to ensure that pixels in consistent colors in the original image have the same gray level in a result image; in order to maintain the gray pixel characteristics, gray pixels in the original image are marked out first, it is forcibly specified that gray values of the gray pixels are known and equal to R all the time in the achromatic transformation process, and then the double-Gauss model is used for constructing a gray characteristic maintaining energy item between the gray pixels and the other pixels. The three energy items are linearly combined to obtain a target energy function, then the gray value for obtaining a minimum total energy value is solved through an iterative method, and therefore a final achromatic result is obtained.

Description

technical field [0001] The invention belongs to the field of computers and relates to the technical field of color image grayscale algorithm design, in particular to an achromatic algorithm for maintaining contrast, color consistency and grayscale pixel features. Background technique [0002] With the continuous development of science and technology in recent years, today's digital printing technology has been unable to meet people's requirements for maintaining the original image. Although color printing technology has appeared on the market now, which can keep more detailed information, but color printing technology requires a lot of energy consumption, the price is relatively expensive, and it is not yet popular in our daily life; at the same time, many digital cameras currently Many different styles are also designed according to the needs of customers. Among them, the image grayscale style loses a lot of important details and cannot meet the requirements of art research...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 刘春晓罗婷婷
Owner ZHEJIANG GONGSHANG UNIVERSITY
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