python读取网络摄像头的帧,使用OpenCVPython绑定将帧从网络摄像头保存到磁盘

我正在尝试使用opencv将网络摄像头中的帧另存为jpgs或png或其他格式.尽管这里有这样的例子,但事实证明,这比我想象的要困难得多&＃xff1a;Capturing a single image from my webcam in Java or Python

我正在尝试这样做&＃xff1a;

if __name__ &＃61;&＃61; "__main__":

print "Press ESC to exit ..."

# create windows

cv.NamedWindow(&＃39;Raw&＃39;, cv.CV_WINDOW_AUTOSIZE)

cv.NamedWindow(&＃39;Processed&＃39;, cv.CV_WINDOW_AUTOSIZE)

# create capture device

device &＃61; 0 # assume we want first device

capture &＃61; cv.CaptureFromCAM(0)

cv.SetCaptureProperty(capture, cv.CV_CAP_PROP_FRAME_WIDTH, 640)

cv.SetCaptureProperty(capture, cv.CV_CAP_PROP_FRAME_HEIGHT, 480)

# check if capture device is OK

if not capture:

print "Error opening capture device"

sys.exit(1)

while 1:

# do forever

# capture the current frame

frame &＃61; cv.QueryFrame(capture)

if frame is None:

break

# mirror

cv.Flip(frame, None, 1)

# face detection

detect(frame)

# display webcam image

cv.ShowImage(&＃39;Raw&＃39;, frame)

# handle events

k &＃61; cv.WaitKey(10)

if k &＃61;&＃61; 0x1b: # ESC

print &＃39;ESC pressed. Exiting ...&＃39;

break

if k &＃61;&＃61; 0x63 or k &＃61;&＃61; 0x43:

print &＃39;capturing!&＃39;

s, img &＃61; capture.read()

if s:

cv.SaveImage("r&＃39;C:\test.jpg", img)

如您所见,当我按下字母c时,我尝试使用Froyo在另一个问题中建议的代码修改来使其捕获图像.它不起作用,我找不到使它起作用的文档.

请帮忙&＃xff01;

非常感谢,

亚历克斯

解决方法:

更改您的保存部分,如下所示&＃xff1a;

if k &＃61;&＃61; 0x63 or k &＃61;&＃61; 0x43:

print &＃39;capturing!&＃39;

cv.SaveImage("test.jpg",frame)

对我有用.由于已经捕获了要检测的帧,因此需要再次捕获以保存它.

cv.CaptureFromCam()和cv.VideoCapture()也不同.他们不要混在一起.

标签&＃xff1a;opencv,webcam,python

来源&＃xff1a; https://codeday.me/bug/20191201/2078226.html