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The pixel coordinates data type is an int32 vector of up to three values depending on the image dimensionality: 1D: [row]; 2D: [row,column]; 3D: [row,column,depth]. The top-left pixel of a 2D image is at the coordinates [1,1]. The center pixel of a structuring element is at coordinates [0,0] increasing from left to right and top to down.
In the example below, a one pixel structuring element centered at the origin [0,0] is translated one row down and two columns to the left:
b = mmsetrans(mmbinary(),[1,-2]);
ans = 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0
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