mse calculation for part of matrix

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nadia
nadia 2016-7-27
编辑： nadia 2016-7-30
I have 2 matrix one is original image and second is the attacked image(512*512), now I should divide both of them to 31*31 blocks and then do DCT on these blocks, after that I consider 3 areas in each blocks ( suppose I divide block with 3 diagonal lines) and I should compute mse between DCT of original block and attacked block in each area? how can I do it?

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Image Analyst
Image Analyst 2016-7-28
There is an immse() function.
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nadia
nadia 2016-7-30
编辑：nadia 2016-7-30
I want to begin from index 1 to 14 in row and column to build above triangle but I do not know how to build poly2mask and make x and y? can you help me. the following image show which I want. can you guide me please?
nadia
nadia 2016-7-30
编辑：nadia 2016-7-30
OK, thank you very much I got it.

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