greytheory灰色模型-wenkub
2023-05-21 12:21:10 本頁面
【正文】 ,1) pression pression image Huffman code DWT(Discrete Wavelet Transform) HL1 HL2 HH1 LH1 HH2 LH2 HL3 HL4 LL4 EZW(Embedded Zerotree Wavelet) Wavelet tree EZW(Embedded Zerotree Wavelet) Zero tree: if all the value of someone wavelet tree elements no more then threshold T1 was given. Then we call the subwavelet tree is zero tree. Zero tree imply that the block was smoothly and it is not very important to image. Used Grey Prediction to Compression After DWT and EZW we have a sequence data. If some point is no more then the threshold T2, then we make the GM(1,1) model else or not. If n=4 was the worst case, but n4 was not. ? n, a,b replace the model sequences. Apply Zerotree to distinguish between the insignificant and significant coefficients More then threshold T1 is significant coefficients that is important for an image. If no more then T1, it is the smooth parts of an ima
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