本文详细介绍了OpenCV中VideoCapture类的多种构造函数用法，包括如何使用C++及Python来初始化摄像头或视频文件捕获设备。文中还提供了不同API的具体调用方式，并附带了参数说明。
VideoCapture constructors.
-
C++:
VideoCapture::
VideoCapture
(
)
-
C++:
VideoCapture::
VideoCapture
(const string&
filename
)
-
C++:
VideoCapture::
VideoCapture
(int
device
)
-
Python:
cv2.
VideoCapture
(
) → <VideoCapture object>
-
Python:
cv2.
VideoCapture
(filename
) → <VideoCapture object>
-
Python:
cv2.
VideoCapture
(device
) → <VideoCapture object>
-
C:
CvCapture*
cvCaptureFromCAM
(int
device
)
-
Python:
cv.
CaptureFromCAM
(index
) → CvCapture
-
C:
CvCapture*
cvCaptureFromFile
(const char*
filename
)
-
Python:
cv.
CaptureFromFile
(filename
) → CvCapture
-
Parameters: - filename – name of the opened video file
- device – id of the opened video capturing device (i.e. a camera index). If there is a single camera connected, just pass 0.
Note
In C API, when you finished working with video, release CvCapture structure with cvReleaseCapture(), or usePtr<CvCapture> that calls cvReleaseCapture() automatically in the destructor.
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