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JPEG (joint photographic experts group)-LS (layer style) image compression control method based on image source features

A technology of JPEG-LS and control method, which is applied in the direction of image communication, television, electrical components, etc., to achieve the effects of less resource occupation, faster speed and simple method

Active Publication Date: 2012-12-19
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

[0007] The patent application number is CN201010617932.2, and the Chinese patent titled "A Code Rate Control Method for JPEG-LS Image Compression" discloses a method of dynamically adjusting the value of the parameter NEAR through the accumulated deviation between the actual code rate and the target code rate. Size, so that different image content can be output at a bit rate close to the required bit rate after JPEG-LS compression, but this method does not use the image source characteristics to solve the problem of irregular stripes in the decompressed and restored image in low gray areas

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  • JPEG (joint photographic experts group)-LS (layer style) image compression control method based on image source features
  • JPEG (joint photographic experts group)-LS (layer style) image compression control method based on image source features
  • JPEG (joint photographic experts group)-LS (layer style) image compression control method based on image source features

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[0035] Such as figure 1 Shown is the schematic diagram of the method of the present invention. The method traverses the image to be compressed, and determines the low-gray level flat area satisfying a certain threshold according to the quasi-context model. The method consists of three parts: establishment of a quasi-context model, determination of low-gray level flat areas, and error control.

[0036] The quasi-context model modifies the context model of the JPEG-LS standard. Although the same as the JPEG-LS standard, the pixel sample point context model is composed of Ra, Rb, Rc and Rd, and the update of the context model is performed according to the JPEG-LS standard. However, the reconstruction value update of the current pixel sample point is modified according to different processing modes as follows: when the current pixel sample point Ix is processed as a normal mode, its reconstruction value Rx=Ix, that is, the reconstruction value is the pixel sample point itself; ...

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Abstract

Disclosed is a JPEG (joint photographic experts group)-LS (layer style) image compression control method based on image source features. The method includes statistically analyzing run features of images to be compressed, and taking feature result as an input parameter of a dynamic deviation method for modification to control an error parameter NEAR in a JPEG-LS image compression algorithm so as to effectively control probability of random stripes appearing in uncompressing images and control image compression quality. The method is simple in operation, small in resource occupation for hardware implementation and easy to be implemented through an FPGA (field programmable gate array) or ASIC (application specific integrated circuit), and can effectively increase image preprocessing speed.

Description

technical field [0001] The invention relates to an image compression method. Background technique [0002] JPEG-LS (Joint Photographic Expert Group-Lossless and near lossless) is an international standard for image lossless and near lossless compression developed by the Joint Photographic Experts Group. It is the best performance in the field of lossless and near lossless compression. algorithm. Applying it to the lossless and near-lossless compression of remote sensing satellite images has achieved good results, and the lossless compression ratio is higher than that of the general adaptive arithmetic coding algorithm with strong performance. The core algorithm of JPEG-LS is adopted from the LOCO-I compression scheme provided by HP Labs, which mainly uses technologies such as prediction, run length coding and prediction error Golomb entropy coding. Because of its simple structure, low complexity, easy hardware implementation, and excellent low-magnification compression per...

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Application Information

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IPC IPC(8): H04N7/26H04N19/85
Inventor 张海涛孙文方王元乐
Owner XIAN INSTITUE OF SPACE RADIO TECH
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