如何在Python的Opencv Cam窗口中提供开始，停止，捕获和关闭按钮 [英] How to give Start, stop, capture and close buttons in Opencv Cam window in Python

问题描述

如何在视频捕获窗口中使用开始"，停止"，捕获"和关闭"按钮来启动，停止，拍摄快照和关闭窗口?

How to give start, stop, capture, and close buttons in video capture window to start, to stop, to take snapshot, to close the window?

我正在使用以下代码打开摄像机进行视频流传输:

I am using the below code to to open camera for video streaming:

import cv2.cv as cv
    cv.NamedWindow("camera", 1)
    capture = cv.CaptureFromCAM(0)
    while True:
        img = cv.QueryFrame(capture)
        cv.ShowImage("camera", img)
        if cv.WaitKey(10) == 27:
            break

推荐答案

无法使用按钮，但是您可以使用鼠标单击和按键来控制视频.例如，使用鼠标左键切换播放/暂停并通过击键实现记录:

Buttons aren't possible but you can use mouse clicks and key strokes to control your video. For example, use left click to toggle play/pause and implement record via key stroke:

import cv2

run=False
frame=0
path=#some video path

def foo(event, x, y, flags, param):
    global run
    global frame
    #check which mouse button was pressed
    #e.g. play video on left mouse click
    if event == cv2.EVENT_LBUTTONDOWN:
        run= not run
        while run:

            frame+=1
            frame=cap.read()[1]
            cv2.imshow(window_name, frame)
            key = cv2.waitKey(5) & 0xFF
            if key == ord("v"):
                pass
                #do some stuff on key press

    elif event == cv2.EVENT_RBUTTONDOWN:
        pass
        #do some other stuff on right click


window_name='videoPlayer'
cv2.namedWindow(window_name)
cv2.setMouseCallback(window_name, foo)

cap=cv2.VideoCapture(path)

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