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What is the advantage of having 8x8 DCT in jpeg instead of 4x4 or 16x16 ?

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amith

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HI All,
what is the advantage of having 8x8 DCT in jpeg instead of 4x4 or 16x16
other than computaion expensive .
 

mmelek1

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JPEG -DCT

With DCT you convert the 8*8 block into very few values to store, may be less than 10 values (instead of 64)
I believe that 4*4 is too small, you won't achieve good compression.
16*16 would probably cause the resulting image to not sharp or smooth enough (bad reconstruction).
 

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