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A Color Image Compression Method Based on Reaction-Diffusion Equations

A diffusion equation, color image technology, applied in the field of image processing, can solve the problem of color information prone to block effect, etc., achieve rich details, improve PSNR value and SSIM value, detail and meticulous effect

Active Publication Date: 2020-06-23
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention proposes a color image compression method based on reaction-diffusion equations in order to solve the problem that the existing color image compression method is prone to block effects in the compression of color information, and the technical scheme adopted is as follows:

Method used

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  • A Color Image Compression Method Based on Reaction-Diffusion Equations
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  • A Color Image Compression Method Based on Reaction-Diffusion Equations

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Embodiment 1

[0044] This embodiment proposes a color image processing method based on reaction-diffusion equations, the color image processing method first converts the color image into a grayscale image in the compression stage, and uses the JPEG compression method to compress the grayscale image , and then use the local optimal strategy to select some representative pixels in the color image, and then only store the compressed grayscale image and the selected representative pixels to achieve the purpose of compression; in the decompression stage, use the reaction-diffusion equations to The stored data is decompressed into a raw color image.

[0045] The color image compression method based on the reaction-diffusion equations proposed in this embodiment is different from improving the JPEG compression method itself in the improvement process of the traditional JPEG compression method, but chooses to perform early image optimization processing on the image to be compressed by the JPEG compr...

Embodiment 2

[0047] Embodiment 2 is a further limitation to the color image compression method based on reaction-diffusion equations described in embodiment 1, and the specific steps of the color image compression process in the color image compression method based on reaction-diffusion equations are:

[0048] Step 1: Convert the original color image to u 0 Divided into a series of small images u of 8*8 pixels i , where i=1, 2, 3...;

[0049] Step two: at u i traversing all 64 pixels, using this pixel as a representative pixel to repair the small image u described in step 1 by using reaction-diffusion equations i ;

[0050] Step 3: Calculate the repaired small image u in the 64 situations described in Step 2 i PSNR value;

[0051] Step 4: Obtain the small image u described in Step 3 i The representative pixel point x in i and the representative pixel point x i Corresponding PSNR value: PSNR i , where represents pixel x i is the pixel corresponding to the PSNR value with the highe...

Embodiment 3

[0062] Embodiment 3 is a further limitation of the color image processing method based on reaction-diffusion equations in embodiment 2. The specific number of a series of small images of 8*8 pixels in step 1 is M*N / 64, where M and N Respectively represent the number of pixels in the length and width of the original color image. If M and N are not multiples of 8, it is necessary to symmetrically extend the length and width of the original color image to multiples of 8.

[0063] Dividing the original color picture into multiple small images of 8*8 pixels can greatly reduce the calculation time of the algorithm to solve the representative pixel points, thereby reducing the time for the proposed model compression and decompression.

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Abstract

The invention provides a color image compression method based on a reaction-diffusion equation set. The color image compression method belongs to the field of image processing technologies. The colorimage compression method comprises the steps of: firstly, converting a color image into a grayscale image in a compression phase, compressing the grayscale image by using a JPEG compression method, then selecting a number of representative pixel points in the color image by utilizing a local optimal strategy, and only storing the compressed grayscale image and the selected representative pixel points to achieve the purpose of compression; and decompressing the stored data into the original color image by utilizing the reaction-diffusion equation set in a decompression phase. The color image compression method based on the reaction-diffusion equation set has the advantage of reducing a storage space of the color image, so that the display effect of the decompressed color image is clearer, and the details are more abundant, meticulous and the like.

Description

technical field [0001] The invention relates to a color image compression method based on reaction-diffusion equations, and belongs to the technical field of image processing. Background technique [0002] Image compression is a common problem in fields such as computer science and technology. Affected by factors such as storage space and network transmission speed, people often need clear images with high compression ratio. For example, due to the speed of the network, most of the images we see on the Internet are compressed. [0003] JPEG (Joint Photographic Experts Group) is the first international image compression standard and the most widely used image compression standard in the past two decades. JPEG-based image compression results can be seen everywhere on the Internet. However, as an ancient image compression standard, the shortcomings of JPEG are also magnified as people's requirements for image quality increase. The defects of JPEG come from two aspects. First...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/42H04N19/86
Inventor 张达治郭志昌孙杰宝吴勃英
Owner HARBIN INST OF TECH
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