I have a matrix that I want to extract an ROI from. I am using roipoly to clip the region. The syntax below gives the coordinates of the polygon in the intrinsic coordinate system, I believe. How can I get the matrix indices for each vertex of the polygon?
[xrefout,yrefout,BW,xi2,yi2] = roipoly(tst);
I select some square.
xi2 and yi2 are real valued. To get the pixel value, does one just round xi2 and yi2 to the nearest integer?