You are presented with multiple paper abstracts, alongside the associated literature review and chapter titles. Given the provided information, you are going to do a literature review. Please generate a coherent literature review that synthesizes the content, draws connections between different works, highlights major findings, and identifies any gaps in the existing research.

Literature Review Title: Vision based Traffic Police Hand Signal Recognition in Surveillance Video- A Survey R.Sathya 
Chapter Title:  Body Model. 
1. Abstract of Cited Paper (BIB001):  Action recognition has become a very important topic in computer vision, with many fundamental applications, in robotics, video surveillance, human-computer interaction, and multimedia retrieval among others and a large variety of approaches have been described. The purpose of this survey is to give an overview and categorization of the approaches used. We concentrate on approaches that aim on classification of full-body motions, such as kicking, punching, and waving, and we categorize them according to how they represent the spatial and temporal structure of actions; how they segment actions from an input stream of visual data; and how they learn a view-invariant representation of actions.

Literature Review:
Represent the spatial structure of the human body. Video streams are observed each frame, the pose of human body is recovered from a variety of available features. BIB001 human action recognition is performed based on such pose estimates. Recognition divides the task of action recognition in two separate stages. A motion captures stage which estimates a 3D model of the human body. BIB002 human body typically represented as a kinematic joint model and an action recognition stage which operates on joint trajectories.