opencv中如何使用Trackbar

本篇文章为大家展示了opencv中如何使用Trackbar，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。

代码展示:

import numpy as npimport cv2 as cvdef nothing(x):  # 回调函数,x是当前trackbar上光标的取值# print(x)pass  # 什么都不做# Create a black image, a windowimg = np.zeros((500,1000,3), np.uint8)cv.namedWindow('image4LinMaZi')# create trackbars for color changecv.createTrackbar('R_red','image4LinMaZi',0,255,nothing)  # 添加trackbar,名字,默认值,最大值,回调函数cv.createTrackbar('G_green','image4LinMaZi',0,255,nothing)cv.createTrackbar('B_blue','image4LinMaZi',0,255,nothing)# create switch for ON/OFF functionalityswitch = '0:OFF\n1:ON'cv.createTrackbar(switch, 'image4LinMaZi',0,1,nothing)while True:cv.imshow('image4LinMaZi',img)k = cv.waitKey(1) & 0xFFif k == 27:break# get current positions of four trackbarsr = cv.getTrackbarPos('R_red','image4LinMaZi')g = cv.getTrackbarPos('G_green','image4LinMaZi')b = cv.getTrackbarPos('B_blue','image4LinMaZi')s = cv.getTrackbarPos(switch,'image4LinMaZi')if s == 0:img[:] = 0else:img[:] = [b,g,r]cv.destroyAllWindows()

运行结果截图展示:

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