如何在 Python 中的 Opencv Cam 窗口中提供开始、停止、捕获和关闭按钮
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How to give Start, stop, capture and close buttons in Opencv Cam window in Python
提问by PSSR
How to give start, stop, capture, and close buttons in video capture window to start, to stop, to take snapshot, to close the window?
如何在视频捕获窗口中设置开始、停止、捕获和关闭按钮来启动、停止、拍摄快照、关闭窗口？
I am using the below code to to open camera for video streaming:
我正在使用以下代码打开摄像头进行视频流：
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
采纳答案by jlarsch
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:
按钮是不可能的，但您可以使用鼠标点击和击键来控制您的视频。例如，使用左键单击切换播放/暂停并通过击键实现录制：
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)
回答by SimonPJ
I had this problem before with OpenCV. As far as I am aware there is no functionality for buttons in OpenCV.
我之前在 OpenCV 上遇到过这个问题。据我所知，OpenCV 中没有按钮功能。
However, I used Tkinter and created a canvas along with some buttons (in your case these will be start, stop, capture, close). Each frame that was captured using OpenCV I drew onto the Tkinter canvas.
但是，我使用了 Tkinter 并创建了一个带有一些按钮的画布（在您的情况下，这些按钮将是开始、停止、捕获、关闭）。我在 Tkinter 画布上绘制了使用 OpenCV 捕获的每一帧。
I was using this for a frame by frame program, so I am not sure how well this method will perform in real time.
我在逐帧程序中使用它，所以我不确定这种方法的实时性能如何。
A very quick example code:
一个非常快速的示例代码：
from Tkinter import *
import cv2.cv as cv
root = Tk()
w = Canvas(root, width=500, height=300, bd = 10, bg = 'white')
w.grid(row = 0, column = 0, columnspan = 2)
b = Button(width = 10, height = 2, text = 'Button1')
b.grid(row = 1, column = 0)
b2 = Button(width = 10, height = 2, text = 'Button2')
b2.grid(row = 1,column = 1)
cv.NamedWindow("camera",1)
capture = cv.CaptureFromCAM(0)
while True:
img = cv.QueryFrame(capture)
canvas.create_image(0,0, image=img)
if cv.WaitKey(10) == 27:
break
root.mainloop()
This may or may not work right off the bat as I am not in a position to test this right now. One potential change I can see would be the image format OpenCV uses. You may need to use one of the conversion functions to change the format.
这可能会也可能不会立即起作用，因为我现在无法对此进行测试。我可以看到的一个潜在变化是 OpenCV 使用的图像格式。您可能需要使用其中一种转换函数来更改格式。
