Finding the largest difference between any two pixels within a set of 5 contiguous pixels
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mcl1993
il 8 Mag 2017
Commentato: Walter Roberson
il 9 Mag 2017
I have a matrix of 22 x 22 cells each containing a number. For a given cell, I need to find the largest difference between any two cells within a set of five contiguous pixels (ie. that cell and the one above, below, left and right of it). I then need to step forward one cell from the original cell and again analyse the next set of five cells, and repeat this for every column in the matrix.
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Walter Roberson
il 8 Mag 2017
Use imdilate() with [0 1 0; 1 1 1; 0 1 0] to get the largest value, and imerode() with the same structuring element to get the smallest value, and subtract.
imdilate() corresponds to maximum over the selected pixels, and imerode() corresponds to minimum over the selected pixels.
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Walter Roberson
il 9 Mag 2017
The last line there, the reference to pixel_diff is a reference to the computation of the short version with imerode and imdilate, and the isequal() is just there to prove that the computations come out the same, to give evidence that the imerode / imdilate version can be trusted.
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