Through the analysis of JPEG image compression standard, this paper has found a method to solve this problem. Before JPEG is quantified, it is analyzed to determine whether this image block is the block of the edge, and the size of the marginal block is measured with a small quantization step. Other blocks can be quantified using a coarser or primitive quantization step, thus improving the quality at the edge of the image. This paper USES DCT After transformation of DC DC coefficient values to determine the image edge, because the DC coefficients for the image of the average brightness, if the adjacent block DC value change is bigger, more edge details are included in it, or describe the image block changes gently, contains less edge. We can according to the variation of the DC value generally decided that a quantitative factor and then will be a fine edge block in quantitative quantitative edge, can very good protection to achieve the purpose of protect edge. The experimental results show that compared with the standard JPEG quantization, the method quantification can improve the image peak signal-to-noise ratio (PSNR) at least 1 ~ 3dB, and the effect of image quality improvement is obvious.

Packet : 55593366vectorization-and-edgereserved-quantization-of-image.rar filelist
Vectorization and Edge-reserved Quantization of Image.kdh

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