dct quantisation on image

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vaishali
vaishali 2014-11-6
回答： SRI 2014-11-6
Hello
I am writing code for dct image steganography. There I have divided the cover image into 8*8 block. later I subtracted 128 from each pixel value. Then how to apply quantization on each block?
thanks in advance

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回答（1 个）

SRI
SRI 2014-11-6
Hi Vaishali
Now go through the command blkproc(which is nothing but a block processing) just apply the 8x8 matrix into this block

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