这是一个JPEG图像编码及解码的程序。它不使用水平方向。

This a JPEG encoding & decoding program of still image. It does not use level shifting. Discrete Cosine transform (DCT) is performed both by classical & Chen s Flowgraph methods. Predefined JPEG quantization array & zigzag order are used here. RUN - LEVEL coding is used instead of Huffman coding. Compression ratio is compared for each DCT method. Effect of coarse and fine quantization is also examined. The execution time of 2 DCT methods is also checked. In addition, most energatic DCT coefficients are also applied to examine the effect in MatLab 7.4.0 R2007a. Input is 9 gray scale pictures & output is 9*9=81 pictures to compare. Blocking effect is obvious. -This is a JPEG encoding & decoding program of still image. It does not use level shifting. Discrete Cosine transform (DCT) is performed both by classical & Chen s Flowgraph methods. Predefined JPEG quantization array & zigzag order are used here. RUN - LEVEL coding is used instead of Huffman coding. Compression ratio is compar

license.txt
rgbquadtree
avgofmatblks.m
converttoclass.m
delsparsekeybyxANDy.m
drawquadblocks.m
fillrect_ulwh.m
ispowerof2.m
main.m
padrgbtomakepowof2.m
padtomakepowof2.m
qt3ddecom.m
qtreedecode.m
qtreergbdecode.m
qtrgbsplit.m
rafting.png
readme_rgbquadtree.txt
splitinto4.m
trimsparse.m