Color image-grey-scale image-color image conversion method

A conversion method and color map technology, applied in the field of image processing, can solve problems such as large distortion of color images, and achieve the effect of good visual quality and high quality

Active Publication Date: 2021-05-14
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When reconstructing a color image, a luminance plane with little distortion or even a luminance plane without distortion can

Method used

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  • Color image-grey-scale image-color image conversion method
  • Color image-grey-scale image-color image conversion method
  • Color image-grey-scale image-color image conversion method

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Experimental program
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Embodiment 1

[0082] This embodiment provides a color image-grayscale image-color image conversion method based on image compression technology and digital watermarking technology. The digital watermarking technology adopts large-capacity LSB digital watermarking technology, including the following steps:

[0083] Such as figure 1 As shown, the color image conversion grayscale image encoding process:

[0084] a) Read the original color image I ,calculate I the size of M*N*C ; Compute the value in binary M*N*C*8 Minimum number of digits required w ,in, M*N*C Represents the total number of pixels in the image, and each pixel is represented by an 8-bit binary number. M*N*C*8 is the amount of data to calculate the color image, w for subsequent w Bit binary code stream records the size of the compressed chroma plane;

[0085] b) Convert the original color image to I Perform RGB to Ycbcr color space conversion, luminance plane Y and chroma planes cb, cr can be processed separately; ...

Embodiment 2

[0114] This embodiment provides a color image-grayscale image-color image conversion method based on image compression technology and reversible watermarking technology, using Vasiliy's large-capacity reversible watermarking technology based on prediction error expansion, specifically including the following steps:

[0115] a) Read the original color image I ,calculate I the size of M*N*C ; Compute the value in binary M*N*C*8 Minimum number of digits required w , w for subsequent w Bit binary code stream records the size of the compressed chroma plane;

[0116] b) Convert the original color image to I Perform RGB to Ycbcr color space conversion, luminance plane Y and chroma planes cb, cr can be processed separately;

[0117] The color space conversion from RGB to Ycbcr is as follows:

[0118]

[0119] Among them, R, G, B are the original color image RGB three channels, Y, cb, cr The luminance plane Y and chromaticity plane obtained after color space conversion c...

Embodiment 3

[0149] A color image-grayscale image-color image conversion system, comprising: a color image conversion grayscale image encoding module and a grayscale image reconstruction color image decoding module;

[0150] In this embodiment, the color image conversion grayscale image encoding module includes: an original color image data volume calculation module, a color space conversion module, a chroma plane compression module, an image size calculation module, and an information embedding module;

[0151] In this embodiment, the grayscale image reconstruction color image decoding module includes: a chroma plane image size extraction module, a color information extraction module and a reconstruction module;

[0152] In this embodiment, the original color image data volume calculation module is used to read the original color image, and calculate the data volume of the original color image to obtain M*N*C*8 , the calculation uses the binary representation value M*N*C*8 Minimum number...

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Abstract

The invention discloses a color image-grey-scale image-color image conversion method, which comprises the following steps of: a coding process of converting a color image into a grey-scale image: carrying out RGB (Red, Green, Blue)-Ycbcr color space conversion on an original color image to obtain a brightness plane and two chrominance planes, and compressing the two chrominance planes to obtain compressed chrominance planes, the binary code stream is used as watermark information to be embedded into a brightness plane to obtain a watermark grayscale image; and a grayscale image reconstruction color image decoding process: extracting a binary code stream of a compressed chrominance plane from the grayscale image embedded with the watermark information, recovering the two chrominance planes according to the binary code stream, performing color space conversion from Ycbcr to RGB on the brightness plane and the two chrominance planes, and reconstructing a color image. According to the method, more color information is stored, a brightness plane with small distortion or without distortion can be obtained during reconstruction, and not only can a high-quality gray level image be obtained, but also a high-quality reconstructed color image can be obtained.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a conversion method for converting a color image into a grayscale image and then effectively restoring a color image from the grayscale image. Background technique [0002] Traditional color image-grayscale image-color image conversion methods can be divided into two categories, the first one is based on edge information embedding algorithm, and the second one is based on vector quantization algorithm. [0003] The algorithm based on side information embedding uses wavelet transform, discrete cosine transform or wavelet packet transform to transform the luminance plane of the color image in frequency domain, downsamples the chroma plane and embeds it into the high frequency band of the luminance plane, and then transforms the luminance plane Do frequency domain transformation to get a grayscale image. When reconstructing, the frequency domain transformation is performed...

Claims

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Application Information

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IPC IPC(8): G06T5/00G06T1/00G06T9/00G06T3/00
CPCG06T1/0021G06T3/0012G06T5/007G06T9/00G06T2207/10024
Inventor 项世军梁巧仪
Owner JINAN UNIVERSITY
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