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A Decolorization Method Preserving Contrast, Color Consistency, and Grayscale Pixel Characteristics

A technology of pixel characteristics and contrast, applied in image enhancement, image data processing, instruments, etc., can solve the problem of lack of original image color consistency

Inactive Publication Date: 2017-12-15
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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  • A Decolorization Method Preserving Contrast, Color Consistency, and Grayscale Pixel Characteristics
  • A Decolorization Method Preserving Contrast, Color Consistency, and Grayscale Pixel Characteristics
  • A Decolorization Method Preserving Contrast, Color Consistency, and Grayscale Pixel Characteristics

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Experimental program
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Effect test

Embodiment

[0095] 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;

[0096] 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;

[0097]

[0098] In formula (3),

[0099] x is the pixel on the image, y is the adjacent pixel in the 4 fields of x, (x,y)∈NP, and NP represents the set of adjacent pixels;

[0100] L, a and b respectively represent the brightness channel and two color channels of the color image in the Lab color space;

[0101] L x , a x and b x Respectively represent the three color values ​​​​of the pixel x in the Lab color space;

[0102] L y , a y and b y respectively represent the three color values ​​of pixel y in the Lab color space;

[0103]

[010...

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Abstract

The invention discloses an achromatic algorithm for maintaining contrast, color consistency and gray pixel features. We use the double Gaussian model to construct the contrast-preserving energy term between pixel pairs, so as to maintain the structure and local contrast information of the original image; at the same time, we use the local linear embedding model to construct the color consistency constraint energy term to ensure that the color in the original image is consistent. The pixels also have the same gray level in the resulting image; in order to preserve the gray pixel characteristics, we first mark the gray pixels in the original image, and enforce that the gray values ​​of these pixels are known and the achromatic transformation The process is always equal to their R value, and then the double Gaussian model is used to construct the gray feature maintenance energy item between the gray pixel and other pixels. We linearly combine these three energy items to obtain the target energy function, and then use an iterative method to solve the gray value that minimizes the total energy value, thus obtaining the final achromatic result.

Description

technical field [0001] The invention belongs to the field of computers, relates to the technical field of color image grayscale algorithm design, and specifically refers to a decolorization method for maintaining contrast, color consistency and grayscale pixel characteristics. 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 o...

Claims

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Application Information

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