Opencv how to make edges more visible

Python
5

1
1701×995 339 KB 

 contours, hierarchy = cv2.findContours(gray_img, cv2.RETR_TREE, cv2.CHAIN_APPROX_NONE)

            filtered_cnts = []
            for cnt in contours:
                area = cv2.contourArea(cnt)
                if area > 20:
                    filtered_cnts.append(cnt)

            cv2.drawContours(bgr_img, filtered_cnts, -1, (0, 255, 0), 1)