finding block with minimum mean in cell array?

Question

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Hi, I have a problem with finding blocks with minimum mean in cell array. I have a cell array like

salientMask_B128x128=mat2cell(salientMask,128 * ones(1, size(salientMask,1) / 128), 128 * ones(1, size(salientMask,2) / 128));

that divide a 512x512 image to blocks with size 128x128. now I want to find 4 first blocks which have minimum mean. how can I do it?

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nadia 2016-2-16

编辑：nadia 2016-2-16

the indices of these blocks are very important for me and I should find them.

Answer 1

Jos (10584) 2016-2-16

0 个投票

Get the mean for each block using cellfun, and apply a sort to get the indices in order.

M = cellfun (@(x) mean(x(:)), salientMask_B128x12) ;
[Msorted, idx] = sort(M(:)) ;
RequiredIndices = idx(1:4)

nadia 2016-2-16

thank you. it was very good. I did it with for loop but this is much better.