transform_128.m

零树编码用于１２８*１２８图象压缩算法

function temp=transform_128(x);
wname='db1';
x=x-128;
[cA,cH,cV,cD] = dwt2(x,wname);
[cA1,cH1,cV1,cD1]=dwt2(cA,wname);
[cA2,cH2,cV2,cD2]=dwt2(cA1,wname);
temp=[cA2 cH2;cV2 cD2];
temp=[temp cH1;cV1 cD1];
temp=[temp cH;cV cD];
temp=fix(round(temp));
return