Coordinates for region of interest

#1

face_section = frame[y-offset:y+h+offset,x-offset:x+w+offset]

to find the region of interest in the frame captured from the webcam, why do we specify the ‘y’ coordinate first?

#2

Assume the face section as follows, where i have mentioned the row number and column number,
0 1 2 3 4 5
0 _ _ _ _ _ _
1 _ _ _ _ _ _
2 _ _ _ _ X _
3 _ _ _ _ _ _
4 _ _ _ _ _ _

You have to locate the point X, so its y coordinate would be 2 and x coordinate would be 4, but treating this as a 2-D matrix if you want to reach at that point you need to use, img_name[2][4], and therefore y coordinate needs to be specified first as it depicts row number and x coordinate afterwards which signifies column number.

Hope this cleared your doubt :blush:

1 Like
#3

Thanks :slight_smile:

#4

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