blk_thres_coding.m

本程序的目的是通过变化DCT系数以及寻找可以应用的DCT系数的最小值来进行可扩展的MPEG压缩

% threshold coding for intensity images
function codes=blk_thres_coding(codes, threshold)

% take Discrete Cosine Transform of each block
%codes=dct2(block);

% locate DCT coefficients below threshold and set them to zero
nz=find(abs(codes) < threshold);
codes(nz)=zeros(size(nz));