MATLAB: I’ve an png image of size 192×268. i’ve divided into non-overlapping blocks..now i want to calulate the mean of each and every block.

mean calculation of every blocknon-overlapping blocks

i wanted to calculate the mean of every block in order to check which block(s) have the same mean value…

or other way

i want to compare the mean value of every block

what should i do?

Best Answer

means = blockproc(YourImage, [3 3], @(s) mean2(s.data), 'BorderSize', [3 3], 'TrimBorder', false);

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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: I’ve divided the image into non-overlapping blocks and i want to calculate the mean of every block…

Not sure how you want to define block number but how about:

blockNumber = 1;
for row = 1 : blockSizeR : rows
   for col = 1 : blockSizeC : columns
                row1 = row;
    row2 = row1 + blockSizeR - 1;
    row2 = min(rows, row2);
                col1 = col;
    col2 = col1 + blockSizeC - 1;
    col2 = min(columns, col2);
                oneBlock = grayImage(row1:row2, col1:col2);
                Mean(blockNumber) = mean2(oneBlock);
                fprintf('The mean for block #%d = $f', ...
                blockNumber, Mean(blockNumber));
                blockNumber = blockNumber + 1;
    end
end

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MATLAB: How to divide image to overlapping blocks

MATLAB: I’ve divided the image into non-overlapping blocks and i want to calculate the mean of every block…

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