OpenCV - How to find rectangle contour of a rectangle with round corner?

Question

I\'m trying to find the contour of a rectangle object with round corner in a image. I tried HoughLinesP and findContours, but did not achieve the d

Answer 1

You need to find the bounding rectangle of the found contours.

img = cv2.imread("image.png", -1)

gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

binary = cv2.bitwise_not(gray)

(_,contours,_) = cv2.findContours(binary, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_NONE)

for contour in contours:
    (x,y,w,h) = cv2.boundingRect(contour)
    cv2.rectangle(img, (x,y), (x+w,y+h), (0,255,0), 2)