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This paper provides a brief insight of some famous and particularly important algorithms used for face detection. Face detection is a technology used by/ computer systems to detect faces in a given digital image. Automatic face detection is a very complex problem in image processing and many methods and algorithms have been proposed like Viola Jones, CNN (cascade neural networks), Eigenface etc. We have also tried to talk on each algorithm's efficiency and feasibility.
Srivastava et al. (2017) studied this question.