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OpenPose is an open-source multi-person detection system supporting the body, hand, foot, and facial key points. The method used in the paper uses a nonparametric representation called Part Affinity Fields (PAF) This approach uses the location and orientation of body parts to encode unstructured pairwise relationships between the body parts of the individuals in the image. The system uses a multi-stage CNN. It consists of two types of stages. The first set of stages predicts part affinity fields i.e.e., degree of associations between the. body parts. The last set of. stages predicts the. degree of association between the parts and the..