Display the bottom image of the line and cut the upper image using Opencv

[jenkins43]

I am trying to crop the live video diagonally. With the help of cv.line, I have mentioned the dimensions and my goal is to display the video of the lower side of the line I have drawn and the upper video should be cropped, As a beginner, I was just able to draw a line using the following code:

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import cv2   cv2.namedWindow("preview") vc = cv2.VideoCapture(0)   if vc.isOpened(): # try to get the first frame     rval, frame = vc.read() else:     rval = False   while rval:     cv2.imshow("preview", frame)     rval, frame = vc.read()     key = cv2.waitKey(20)     if key == 27: # exit on ESC         break     else:         cv2.line(img=frame, pt1=(700,5), pt2=(5, 450), color=(255, 0, 0), thickness=1, lineType=8, shift=0)   vc.release() cv2.destroyWindow("preview")

Output:


Suggestion on this will be very helpful

[heiner55]

The idea is: rotate, crop, rotate back:

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#!/usr/bin/python3 import cv2 import imutils   cv2.namedWindow("preview"). vc = cv2.VideoCapture('test.mp4')   if vc.isOpened(): # try to get the first frame     rval, frame = vc.read() else:     rval = False   while rval:     cv2.imshow("preview", frame)     rval, frame = vc.read()     if rval:         frame = imutils.rotate_bound(frame, 45)           h = frame.shape[0]         w = frame.shape[1]         frame = frame[h//2:h, 0:w]           frame = imutils.rotate_bound(frame, -45)       key = cv2.waitKey(20)     if key == 27: # exit on ESC         break   vc.release() cv2.destroyWindow("preview")