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How can custom keypoints / descriptors be created?

I am aware of the DescriptorExtractor class, but I wanted to know if there is a way to create my own key-points and my own descriptors. Say for example, I detect the co-ordinates of corners in an image, and I want to convert them to key-points and descriptors, How can this be done?

While researching, I have seen that descriptors, are calculated based on a 16x16 neighbourhood and using histograms. Can someone please explain how this can be achieved?

Thank you.