Description: 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 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.
File list (Check if you may need any files):
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
...........\readme_rgbquadtree.txt
...........\splitinto4.m
...........\trimsparse.m
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