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1. VideoCapture::retrieve

 

Decodes and returns the grabbed video frame.

 

C: IplImage* cvRetrieveFrame(CvCapture* capture, int streamIdx=0 )

 

2. cvCreateImage

Creates an image header and allocates the image data.

C: IplImage* cvCreateImage(CvSize size, int depth, int channels)

 

 

 

 

 

Mat src = imread("1.tif");
src.release();// free mem
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