greytheory灰色模型(文件)
【正文】 ge, so we replace them by zero to increase the pression rate. DWT + GM(1,1) to pression Image1 Step 1: Original image ?4 level DWT then got 13 wave bands. Step 2: encoding LL4 by uniform quantization. 均勻量化 Step 3: for 13 wave bands set up the zerotree. ? Store the sign map of significant ? Store the relation between significant and insignificant coefficients DWT + GM(1,1) to pression Image2 Step 4: apply the GM(1,1) to model the significant sequences. Store the n, a, b. Step 5: encode the significant coefficients sign map, uniform quantization of LL4, all the n, a, b. Step 6: decode…… ..inverse the pression steps. Experiment CR: pression ration ? CR=(bits of the original image)/(bit of pression image) ?????????????????iii ffP S N R2^10)(255l o g*20Conclusion Grey model is good to high pression rate S
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