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Image processing ;quantize coder and decoder needed urgentily

2 次查看（过去 30 天）
Nizar Ahmad
Nizar Ahmad 2012-1-17
hi friends...I have used a dwt2 on an grayscale image in 5 levels and its gave me large numbers up to 7000 as maximum,I need to use smaller numbers in my work (neer 256 or 512 as maximum) but I am also restricted to have large PSNR and small Compression ratio so I used quatization to reduce the values but I still have problems with the amount of my data so I used the follwoing code for quantization:
c1=c; %c is the input data
MAXc=max(c1);
MINc=min(c1);
MAXc=round(MAXc);
MINc=round(MINc);
v1=mod(MAXc,2);
v2=mod(MINc,2); if v1==1 MAXc=MAXc+1; end if v2==1 MINc=MINc-1; end partition = [MINc:8:MAXc];
codebook = [(MINc/2)-4:4:(MAXc/2)];
[index,quants] = quantiz(c1,partition,codebook);
c=quants; % the output data
(where the c is the result of the 5 levels dwt2 on Lena image) I also need the dequantization step which I don't know how to write it...I hope that I explained my problem clearly I be very thankful to anybody can help me...

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