Here are some problems:

  1. Does it mean these is some relationship among neighboring pixels?
  2. And I've read about DCT has a property of de-correlation,I have a doubt whether it means DCT neighbor coefficients have no relationship?
  3. I've read some paper which says diffrence 2D-array(DCT coefficient subtracting by its neighbor) can weaken the relation of coefficients.How to understand this?

I would really appreciate if someone can help me!

  • $\begingroup$ 1-yes there is similarity, 2-yes for typical images, 3-not clear. $\endgroup$
    – Fat32
    Dec 20 '15 at 13:59
  • $\begingroup$ Since you discuss correlation and not auto correlation, there is no information about neighborhood pixels relevant. DCT might introduce randomness so it could have impact on the correlation function - is it in the spatial domain or frequency domain? The third question is really not clear. $\endgroup$
    – Moti
    Dec 21 '15 at 1:40

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