Embedded Hidden Markov Model (E\|HMM) can extract the main features of faces and has necessary robustness property in treating diversities of poses and lighting environments. This paper deals with the performance improvement of E\|HMM and its implementation. First, The effects of the size of the sampling window and the terms of 2D\|DCT coefficients of every image block on the face recognition accuracy are analyzed, and the optimal sizes of the sampling window and the terms of 2D\|DCT coefficients of every i...