Computer vision: How to Bind Trackbar To OpenCV Windows






import cv2 as cv
import numpy as np
def nothing(x):
print(x)
# Create a black image, a window
img = np.zeros((300,512,3), np.uint8)
cv.namedWindow('image')
cv.createTrackbar('B', 'image', 0, 255, nothing)
cv.createTrackbar('G', 'image', 0, 255, nothing)
cv.createTrackbar('R', 'image', 0, 255, nothing)
switch = '0 : OFF\n 1 : ON'
cv.createTrackbar(switch, 'image', 0, 1, nothing)
while(1):
cv.imshow('image',img)
k = cv.waitKey(1) & 0xFF
if k == 27:#esc
break
b = cv.getTrackbarPos('B', 'image')
g = cv.getTrackbarPos('G', 'image')
r = cv.getTrackbarPos('R', 'image')
s = cv.getTrackbarPos(switch, 'image')
if s == 0:
img[:] = 0
else:
img[:] = [b, g, r]
cv.destroyAllWindows()#close window #=======================================#

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