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Extract a poly from an image and make the poly part a new image

Hi, CVers, I met a problem while doing some ocr task.

Suppose this is the ocr region: image description

I want to extract the content in the white region of raw image as a new image for text recognition, but the region is often not a rectangle, so that I can't crop the poly region out as a new image.

Anyone has an idea to solve this problem? Thanks here in advance:)