How to determine the size of a face in pixels from an image

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I am given an image to load onto matlab. I have to determine the size of each face in the image in terms of pixels (i.e 48x48 pixels). Without using any matlab toolboxs, how could I find the size of the face?
Sample image

Answers (1)

Image Analyst
Image Analyst on 30 Sep 2022
Maybe try drawpolygon to trace the face. Then get the x,y coordinates of what you drew and call polyarea.

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