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OpenCV Python Tutorial For Beginners - How to Bind Trackbar To OpenCV Windows
import numpy as np
import cv2 as cv
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:
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()
import numpy as np
import cv2 as cv
def nothing(x):
print(x)
# Create a black image, a window
cv.namedWindow('image')
cv.createTrackbar('CP', 'image', 10, 400, nothing)
switch = 'color/gray'
cv.createTrackbar(switch, 'image', 0, 1, nothing)
while(1):
img = cv.imread('lena.jpg')
pos = cv.getTrackbarPos('CP', 'image')
font = cv.FONT_HERSHEY_SIMPLEX
cv.putText(img, str(pos), (50, 150), font, 6, (0, 0, 255), 10)
k = cv.waitKey(1) & 0xFF
if k == 27:
break
s = cv.getTrackbarPos(switch, 'image')
if s == 0:
pass
else:
img = cv.cvtColor(img, cv.COLOR_BGR2GRAY)
img = cv.imshow('image',img)
cv.destroyAllWindows()
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