How to search and crop the regions with white color?

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How to search and crop the regions with white color?

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How to search and crop the region with white color?

For example, array[6*5]

00 00 00 00 00 03
00 01 00 00 00 00
00 01 00 00 00 00
00 01 00 02 00 00
00 00 02 02 02 00

(non-zero refers to white color)

is there any function which could find those 3 regions' positions (i need these positions to crop the original image)?
01
01
01

00 02 00
02 02 02

03

I know that how to threshold and copy the roi, but i don't know how to find the regions...
Thanks!

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