manually draw shapes (like using a pencil to draw on figure) on opened image

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Hi! I want to manually draw lines/curves/shapes on an opened image figure, just like using the pencil tool in the paint program of windows, and let the program record the pixels that I have drawn into a variable. Is there an existing function to do this? Thanks in advance.

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Shoaibur Rahman
Shoaibur Rahman il 14 Gen 2015
Try:
roipoly

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