Visual perception correction image compression method based on DCT transform

A technology of visual perception and compression method, which is applied in the direction of image communication, digital video signal modification, electrical components, etc., can solve the problems of long compression time, high computational complexity, and large error of the original image, so as to achieve increased restoration degree and low signal noise. The effect of ratio enhancement and high compression ratio

Inactive Publication Date: 2017-05-03
SICHUAN YONGLIAN INFORMATION TECH CO LTD
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Problems solved by technology

[0004] In view of the above-mentioned shortcomings, the technical problem to be solved by the present invention is that the compressed image in the prior art has a large error with the original image, and the computational complexity is high, resulting in a long compression time.

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  • Visual perception correction image compression method based on DCT transform
  • Visual perception correction image compression method based on DCT transform
  • Visual perception correction image compression method based on DCT transform

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Embodiment Construction

[0011] The present invention is used for image lossy compression. First, the image is converted into Ycrcb format through domain space transformation, and then the image is decomposed into 8*8 image sub-blocks, and each image sub-block is subjected to DCT change. Among the DCT coefficients of the block, the coefficients are processed and decomposed into high-frequency coefficients and low-frequency coefficients through the judgment method. The high-frequency coefficients adopt the error compensation mechanism, and the low-frequency coefficients undergo visual perception correction transformation, and then enter the encoding; the process of reconstructing the image is a compression process. inverse operation.

[0012] A visual perception correction image compression method based on DCT transform, combining figure 1 , the execution steps of the invention are as follows:

[0013] Step 1: The image is converted from the RGB space into the YCrCb three-primary color space, and deco...

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Abstract

The invention proposes a visual perception correction image compression method based on DCT transform. The method is used for lossy compression of an image, and comprises the following steps: firstly, converting the image into a Ycrcb format via domain space transformation; secondly, decomposing the image into 8x8 image subblocks, and performing DCT transform on each image subblock; thirdly, in a DCT coefficient of each subblock, processing the coefficient through a judgment method and then decomposing the coefficient into a high frequency coefficient and a low frequency coefficient, wherein an error compensation mechanism is adopted for the high efficiency coefficient and visual perception correction transformation is performed on the low frequency coefficient, and then encoding; and finally, the process of reconstructing the image is an inverse operation of the compression process. Through the method of the invention, the image can not only get a higher compression ratio, but also the compression efficiency of the image is not reduced due to the increase of the amount of calculation; and meanwhile, the reconstructed image is analyzed, the image restoration degree is increased, the signal to noise ratio is enhanced, and the image restoration quality is obviously improved, therefore, the visual perception correction image compression method based on the DCT transform provided by the invention has strong practicability.

Description

[0001] Field [0002] The invention relates to the field of computer information technology, in particular to the field of image compression. Background technique [0003] Today is the era of network information, and image information transmission through the network has gradually become dominant. As users have higher and higher requirements for image quality, the pressure of image transmission is increasing. Although the hardware is constantly improving, but It can't meet the needs of users in time, so the research on image compression method is also a major topic in today's electronic information technology. In the compression process, in order to achieve higher compression efficiency, we often use lossy compression methods. DCT (discrete cosine transform) as a high-performance coding method can obtain higher compression ratios, but after image reconstruction , the error with the original image is relatively large; therefore, on the basis of DCT transformation, the present ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/625H04N19/124
CPCH04N19/625H04N19/124
Inventor 范勇胡成华
Owner SICHUAN YONGLIAN INFORMATION TECH CO LTD
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