Question

Is there a built-in function in Octave to crop a specific region from an image? I have installed the image processing package but I don’t find a function like imcrop or something like that.

Answer 1

How about if your image (which is a matrix in Octave) is I, and you want to crop from x,y a block of size w,l, then resize(circshift(I,-x,-y), w, l) ought to do it. Basically, shift the matrix so that x,y is now at 1,1, and just cut off the rest of the matrix past w,l.

EDIT: Actually, that was before I learned about matrix indexing. Instead, this is what you want:

Croppedimage = Image(y:y+l-1, x:x+w-1)