import numpy as np
import cv2 as cv
def nothing(x):
pass
# 创建黑色背景和窗口
img = np.zeros((300, 512, 3), np.uint8)
cv.namedWindow('image')
# 为变换颜色创建Trackbar
cv.createTrackbar('R', 'image', 0, 255, nothing)
cv.createTrackbar('G', 'image', 0, 255, nothing)
cv.createTrackbar('B', 'image', 0, 255, nothing)
# 为开关功能创建一个开关
switch = '0 : OFF \n1 : ON'
cv.createTrackbar(switch, 'image', 0, 1, nothing)
while (1):
cv.imshow('image', img)
k = cv.waitKey(1) & 0xFF
if k == 27:
break
# 获取4个Trackbar的位置
r = cv.getTrackbarPos('R','image')
g = cv.getTrackbarPos('G','image')
b = cv.getTrackbarPos('B','image')
s = cv.getTrackbarPos(switch,'image')
if s == 0:
img[:] = 0
else:
img[:] = [b, g, r]
cv.destroyAllWindows()
