want to detect rectangle in a image using opencv-python?

opencv-python

asked 2019-01-21 04:49:24 -0600

here, i tried to detect rectangle from an image and want to save it,but image has two rectangles what i need to save is the bigger one for each image here the smaller one is saving as new image. How to get the bigger one.

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you have width and heigh of rect - so it should be easy to decide which one is bigger - essentially what berak posted with computing the area of the rect.

holger ( 2019-01-22 10:43:48 -0600 )edit

Absolutely, holger.

supra56 ( 2019-01-22 14:47:32 -0600 )edit

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answered 2019-01-22 01:27:19 -0600

berak
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you filter them by area:

largest_area=0
largest_rect = None
for r in rects:
    a = cv2.contourArea(r)
    if a > largest_area:
         largest_area = a
         largest_rect = r