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The algorithm of the JPEG image compression based on DCT was discussed firstly. A new JPEG compression method-pre-filtering before compressing was proposed, which can cope with the problem of impairing dependency of noised digital image. The result indicates that the algorithm is an effective way for grayscale image compression and the image rebuilt is acceptable. The simulation experiments were done...
The traditional JPEG compression standard, unlike JPEG2000, does not prescribe a means for spatially-variable quantization of transform coefficients. This prevents useful features such as region-of-interest (ROI) coding, where, for example, the subject in a photograph may be lightly compressed while the background is heavily compressed to hide irrelevant details. In this paper, we show how the quantization...
Summary form only given. This paper studies how to better exploit intra correlation to compress images. In general, edge and texture areas of images exhibit strong anisotropic property. The correlation among samples is determined by not only their distance but also the link orientation. Traditional transforms are not efficient on handling this anisotropic correlation. Therefore, in this paper we propose...
Blocking effect is the major drawback in DCT-based (discrete cosine transformation) codecs at low bit-rates. In this paper, a post-processing filter is proposed in DCT frequency domain. The proposed algorithm uses a shift block within four adjacent DCT blocks to reduce computational complexity. By slightly modifying several DCT coefficients in the shift block, the artifacts that result from quantization...
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