MATLAB: I want to divide any rgb image of size 512x512x3 into 32 blocks 16 times

aatched image

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reshape(a,[],32,16)

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MATLAB: How to divide image to overlapping blocks

blockproc() can be used overlapping by specifying margins.

Your requirements are confusing. You ask for 16*16 and talk about 4 pixels, but if you subdivide 256*256 into 4 pixel blocks even non-overlapping you are going to get more than 16*16. Are you asking to divide the 256*256 into 16*16 with each of those non-overlapping to each other, and then within each 16*16 block you want to work with overlapping 4x4 pixel blocks (all 225 of them) ??

MATLAB: Divide RGB color space into 16x16x16 bins

Assuming your image is of type double (i.e: intensity range is 0-1), then:

bins = linspace(0, 1, 16);  %if image is uint8, then linspace(0, 255, 16)
bincoords = discretize(rgbimage, bins);

bincoords(row, col, :) is a 3 element vector giving you the location of pixel(row, col) into that 16x16x16 histogram cube. If you want to change that into linear indices:

bincoordslinear = sub2ind([16 16 16], bincoords(:, :, 1), bincoords(:, :, 2), bincoords(:, :, 3));

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MATLAB: How to divide image to overlapping blocks

MATLAB: Divide RGB color space into 16x16x16 bins

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