Created
March 15, 2024 00:33
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opencv_trackbars_example.py
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| import cv2 | |
| import numpy as np | |
| def nothing(x): | |
| pass | |
| # Create a black image, a window | |
| img = np.zeros((300, 512, 3), np.uint8) | |
| cv2.namedWindow("image") | |
| # create trackbars for color change | |
| cv2.createTrackbar("R", "image", 0, 255, nothing) | |
| cv2.createTrackbar("G", "image", 0, 255, nothing) | |
| cv2.createTrackbar("B", "image", 0, 255, nothing) | |
| # create switch for ON/OFF functionality | |
| switch = "0 : OFF \n1 : ON" | |
| cv2.createTrackbar(switch, "image", 0, 1, nothing) | |
| while 1: | |
| cv2.imshow("image", img) | |
| k = cv2.waitKey(1) & 0xFF | |
| if k == 27: | |
| break | |
| # get current positions of four trackbars | |
| r = cv2.getTrackbarPos("R", "image") | |
| g = cv2.getTrackbarPos("G", "image") | |
| b = cv2.getTrackbarPos("B", "image") | |
| s = cv2.getTrackbarPos(switch, "image") | |
| if s == 0: | |
| img[:] = 0 | |
| else: | |
| img[:] = [b, g, r] | |
| cv2.destroyAllWindows() |
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