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Check out the OpenCV wiki. In particular, How to contribute and the style guide cover your questions. In particular, following an algorithm described in a textbook is probably fine, but you should ensure that it is not patented. The style guide says that you should use the InputArray, OutputArray, etc proxy classes.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.