Videocapture: retrieve

Decodes and returns the grabbed video frame.

C ++:  Bool Videocapture :: Retrieve (Mat & Image,
Int Channel= 0 )Bytes ¶

Python:   Cv2.videocapture. Retrieve ([Image [,
Channel] )→ Retval, Image

C:  Iplimage * Cvretrieveframe (Cvcapture * Capture,
Int Streamidx= 0 )

Python:   CV. Retrieveframe (Capture )→
Image

The methods/functions decode and return the just grabbed frame. if no frames has been grabbed (camera has been disconnected, or there are no more frames in video file), The Methods return false and the functions return NULL pointer.

Note

 

Opencv 1.x FunctionsCvretrieveframeAndCv. retrieveframeReturn
Image stored inside the video capturing structure. It is not allowed to modify or release the image! You can copy the frame usingCvcloneimage ()And
Then do whatever you want with the copy.