1. Nefian, A.V., Hayes, M.H.: Face recognition using an Embedded HMM. In: Proeeedings of IEEE International Conferenee on Audio and Video based Biometrie Person Authentieation, vol. 12(3), pp. 19–21 (1999)
2. Fan, C.M., Namazi, N.M., Penafiel, P.B.: A new image Motion estimation algo rithm based on the EM technique. IEEE Trans. Patt. Anal. Machine Intell. 18(3), 3482352 (1996)
3. Yang, M.H., Kriegman, D., Ahuja, N.: Detecting faces in images a survey. IEEE Trans. PAMI 24(1), 34258 (2002)
4. Widjojo, W., Yow, K.C.: A color and feature-based approach to human face detection. In: 7th International Conference Control, Automation, Robotics and Vision, ICARCV 2002, vol. 1, p. 5082513 (2002)
5. Mao, X., Hu, G.: A Gradient Based Estimation Method for HMMs. Journal of Shanghai Jiaotong University 36(5), 72–74 (2002)