【OpenCV】4 TrackBar控件

import cv2
import numpy as np# 回调函数：什么都不做
def callback():pass# 创建窗口
cv2.namedWindow('trackbar', cv2.WINDOW_NORMAL)# 创建TrackBar
cv2.createTrackbar('R', 'trackbar', 0, 255, callback)
cv2.createTrackbar('G', 'trackbar', 0, 255, callback)
cv2.createTrackbar('B', 'trackbar', 0, 255, callback)# 纯黑色背景
img = np.zeros((480, 640, 3), np.uint8)while True:cv2.imshow('trackbar', img)r = cv2.getTrackbarPos('R', 'trackbar')g = cv2.getTrackbarPos('G', 'trackbar')b = cv2.getTrackbarPos('B', 'trackbar')# 改变背景色img[:] = [b, g, r]key = cv2.waitKey(10)if (key & 0xFF == ord('q')):breakcv2.destroyAllWindows()