Removing long horizontal/vertical lines from edge image using OpenCV

Question

How can I use standard image processing filters (from OpenCV) to remove long horizontal and vertical lines from an image?

The images are B&W so removing means si

Answer 1

if your lines are truly horizontal/vertical, try this

import cv2
import numpy as np
img = cv2.imread('c:/data/test.png')
gray=cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
linek = np.zeros((11,11),dtype=np.uint8)
linek[5,...]=1
x=cv2.morphologyEx(gray, cv2.MORPH_OPEN, linek ,iterations=1)
gray-=x
cv2.imshow('gray',gray)
cv2.waitKey(0)    

result

You can refer OpenCV Morphological Transformations documentation for more details.