opencv的TrackBar控件

淼学派对

发布于 2023-10-14 03:00:58

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代码可运行

文章被收录于专栏：云开发小程序1云开发小程序1

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代码可运行

TrackBar控件

createTrackbar(trackbarname,winname,value,count,onChange) 1.创建 TrackBar控件 2.value为 TrackBar控件的默认值 3.count为 TrackBar控件的最大值，最小为0
getTrackbarPos(trackbarname,winname)获取TrackBar当前值

导入相应的库

import cv2
import numpy as np

创建窗口

cv2.namedWindow('trackbar',cv2.WINDOW_NORMAL)
cv2.resizeWindow('mouse',640,360)

定义回调函数

def callback(value):
    print(value)

创建 TrackBar

cv2.createTrackbar('R','trackbar',0,255,callback)
cv2.createTrackbar('G','trackbar',0,255,callback)
cv2.createTrackbar('B','trackbar',0,255,callback)

创建一个背景图片

img = np.zeros((480,640,3),np.uint8)

获取当前TrackBar的值

    r = cv2.getTrackbarPos('R','trackbar')
    g = cv2.getTrackbarPos('G','trackbar')
    b = cv2.getTrackbarPos('B','trackbar')

改变背影图的颜色

    img[:] = [b,g,r]
    cv2.imshow('trackbar',img)

绑定键盘响应事件

    key = cv2.waitKey(1)
    if key & 0XFF == ord('q'):
        break

释放窗口

cv2.destroyAllWindows()

显示结果

完整学习代码

import cv2
import numpy as np

# 创建窗口
cv2.namedWindow('trackbar',cv2.WINDOW_NORMAL)
cv2.resizeWindow('mouse',640,360)
#定义回调函数
def callback(value):
    print(value)
#创建trackbar
cv2.createTrackbar('R','trackbar',0,255,callback)
cv2.createTrackbar('G','trackbar',0,255,callback)
cv2.createTrackbar('B','trackbar',0,255,callback)
#创建一个背景图片
img = np.zeros((480,640,3),np.uint8)

while True:
    #获取当前trackbar的值
    r = cv2.getTrackbarPos('R','trackbar')
    g = cv2.getTrackbarPos('G','trackbar')
    b = cv2.getTrackbarPos('B','trackbar')

    #改变背景图颜色
    img[:] = [b,g,r]
    cv2.imshow('trackbar',img)

    key = cv2.waitKey(1)
    if key & 0XFF == ord('q'):
        break
cv2.destroyAllWindows()