Crop black edges with OpenCV

Question

I think it should be a very simple problem, but I cannot find a solution or an effective keyword for search.

I just have this image.

Answer 1

Python Version 3.6

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Crop images and insert into a 'CropedImages' folder

import cv2
import os

arr = os.listdir('./OriginalImages')

for itr in arr:
    img = cv2.imread(itr)
    gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
    _,thresh = cv2.threshold(gray, 120, 255, cv2.THRESH_BINARY)
    _, contours, _ = cv2.findContours(thresh,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)
    cnt = contours[0]
    x,y,w,h = cv2.boundingRect(cnt)
    crop = img[y:y+h,x:x+w]
    cv2.imwrite('CropedImages/'+itr,crop)

Change the number 120 to other in 9th line and try for your images, It will work