Decodes and returns the grabbed video frame

frame = cap.retrieve()
frame = cap.retrieve('OptionName',optionValue, ...)

Output

• frame output image

Options

• StreamIdx 0-based index (for multi-head camera). default 0
• FlipChannels in case the output is color image, flips the color order from OpenCV's BGR to MATLAB's RGB order. default true

The function decodes and returns the just grabbed frame. If no frames has been grabbed (camera has been disconnected, or there are no more frames in video file), the function returns an empty matrix.