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Noob tutorials: Some definition.

I'm diving into the world of OpenCv and there are some concept very used but that lack of definition: For example: What are exactly a keypoint, a descriptor and extractor.

I'm guessing the definition by their names but I'd appreciate a brief explanation of each.

Thank you very much.

Noob tutorials: Some definition.definitions.

I'm diving into the world of OpenCv and there are some concept very used but that lack of definition: For example: What are exactly a keypoint, a descriptor and extractor.

I'm guessing the definition by their names but I'd appreciate a brief explanation of each.

Thank you very much.