How to search and crop the regions with white color?

How to search and crop the regions with white color?

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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