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pythonimage-processingjupyter-notebookcropscikit-image

How to crop an image using x/y/r pixel coords?

I'm trying to develop some code to crop multiple areas within an image. The only info I have is the x/y pixel coordinates of the top left corner of each crop, and the pixel length of each side (this number is uniform as the crops are all perfect squares.

For example, within one image I may have multiple features needing cropping. Here, the first two figures are the x/y coords of the top left corner, and the third is the length of each of the four sides (r) x, y, r

Currently trying to achieve this in skimage, but not getting very far. Sorry if this is unclear, please feel free to ask more Qs.

Ta, Rhod

Solution

  • Just use Numpy slicing. So if you have:

    X = 10
Y = 20
R = 15

    your extracted ROI is:

    ROI = im[Y:Y+R, X:X+R]