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Actually it depends from case to case. It is an operator that can be specified for each type of input it gets. I know for example that it can be used to effectively retrieve a frame from a capture.

Mat frame;
frame << capture;

This calls internally the function

capture.read();

No idea what this operator does exactly in this case. But it could be something like creating an array of double elements running from 1 -> 16?

Actually it depends from case to case. It is an operator that can be specified for each type of input it gets. I know for example that it can be used to effectively retrieve a frame from a capture.

Mat frame;
frame << capture;
capture >> frame;

This calls internally the function

capture.read();

No idea what this operator does exactly in this case. But it could be something like creating an array of double elements running from 1 -> 16?