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:  Gait recognition 
1. Abstract of Cited Paper (BIB001):  Ten different feature vectors are tested in a gesture recognition task which utilizes 3D data gathered in real-time from stereo video cameras, and HMMs for learning and recognition of gestures. Results indicate velocity features are superior to positional features, and partial rotational invariance is sufficient for good performance.

Literature Review:
Optical character recognition Lip-reading (visual speech to text mapping) Gesture and body motion analysis Several hand gesture recognition systems have been developed using various features computed from static images or image sequences BIB001 . The vision-based method selects the input data as the feature vectors for the HMM input and other HMM-based  BIB002 hand gesture recognition systems have also been development. Gesture recognition system using HMM models has been developed.