How to crop an image in OpenCV using Python

Question

Using OpenCV, Is it possible to crop images, like how I've done in PIL

Using PIL:

im = Image.open('0.png').convert('L')

im = im.crop((1, 1, 98, 33))

im.save('_0.png')

How is it possible in OpenCV?

I tried:

im = cv.imread('0.png', cv.CV_LOAD_IMAGE_GRAYSCALE)

(thresh, im_bw) = cv.threshold(im, 128, 255, cv.THRESH_OTSU)

im = cv.getRectSubPix(im_bw, (98, 33), (1, 1))

cv.imshow('Img', im)

cv.waitKey(0)

But it doesn't work. Can anyone suggest some ways to crop images using OpenCV?

Answer 1

We can use numpy slicing

import cv2

img = cv2.imread("lenna.png")

crop_img = img[y:y+h, x:x+w]

cv2.imshow("cropped", crop_img)

cv2.waitKey(0)

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