How can i find close curved line on an image in python

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community,

Is there any way you can find an close curved line on an image using numpy and opencv or anything else (sample images attached)

close curved line image: enter image description here or simply: enter image description here

unclose curved line image: enter image description here or simply: enter image description here

I need this function to search entire image and if there is one return me true else return false, thanks and happy coding

def check_close_curved_line_on_img(img):
    // logic here 
        if has_close_curved_line:
            return True
    return False
opencv numpy geometry python
1 Answers

You can probably use a combination of floodFill and erode from opencv. The code below worked on the examples provided.

import cv2
import numpy as np

# load and convert to grayscale
img = cv2.imread('unclosed.png')
img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

# floodFill
img = cv2.bitwise_not(img)
mask = np.zeros((np.array(img.shape)+2), np.uint8)
cv2.floodFill(img, mask, (0,0), (255))

# erode
img = cv2.bitwise_not(img)
img = cv2.erode(img, np.ones((3,3)))

# show image
cv2.imshow('show', img)
if img.sum() > 0:
    print('Closed curve detected')
else:
    print('Closed curve was not detected')
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