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Human faces are non-rigid objects with a high degree of variability in size, shape, color, and texture. The face databases are extensively used for evaluation of various algorithms used in facial expression/gesture recognition systems. Any automated system for face and facial gesture recognition has immense potential in identification of criminals, surveillance and retrieval of missing children, office security, credit card verification, video document retrieval, telecommunication, high - definition television, medicine, human - computer interfaces, multimedia facial queries, and low-bandwidth transmission of facial data. This paper presents a comprehensive survey of the currently available databases that can be used in facial expression recognition systems. The growth in face database development has been tremendous during the recent years.
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