[1] LI R , ZEN G B , LIOU M L. A new three-step search algorithm for block motion estimation［J］. IEEE Transactions on Circuits and Systems for Video Technology, 1994,(4):438-442.

[2] ZHU S , MA K K. A new diamond search algorithm for fast block-matching motion estimation［J］. IEEE Trans. Image Processing, 2000,2(9):2872290.

[3] ZHU C , LIN X , CHAU L P. Hexagon-based search pattern for fast block motion estimation［J］. IEEE Transactions on Circuits and Systems for Video Technology, 2002,12(5):349-355.

[4] LIANG Y, LIU W Y. Adaptive cross-quasi-diamond search algorithm based on initial search point estimation［J］.Opt. Precision Eng., 2005,13(2):237-246. (in Chinese)

[5] HOSUR P I, MA K K. Motion vector field adaptive fast motion estimation［C］. Int. Conf . Information , Communications and Signal Processing ( ICICS 1999),1999:1-4.

[6] TOURAPIS A M, AU O C, LIOU M L. Predictive motion vector field adaptive search technique (PMVFAST) enhancing block-based motion estimation［C］. Proc. SPIE Conf. Visual Communication and Image Processing, 2001:883-892.

[7] YAN J W,YU J,QU X B, et al.. Novel fast motion estimation algorithm based on optimizing predictive motion vector［J］. Opt. Precision Eng., 2007，15(10):1622-1627.(in Chinese)

[8] CHEN Z B, XU J F, HE Y, et al.. Fast integer-pel and fractional-pel motion estimation for H. 264/ AVC ［J］. Visual Communication and Image Representation，2006,17(2):264-290.

[9] JIA H J, ZHANG L. Directional diamond search pattern for fast block motion estimation［J］. Electronics -Letters, 2003,39(22):1581-1583.

[10] ZHU SH P, SHEN X D. Cross-hexagon search algorithm for fast block-matching motion estimation［J］. Opt. Precision Eng., 2009,12(12):3069-3076 (in Chinese)

[11] LIAO T M, GUO Z M. Enhanced cross-diamond-hexagonal search algorithms［J］. Image and Graphics, 2009,14(8):1530-1533. (in Chinese)

[12] EZHILARASAN M, THAMBIDURAI P. Simplified block matching algorithm for fast motion estimation in video compression［J］. Journal of Computer Science, 2008，4(4):282-289.

[13] UKALKAR A R, BAWANE N G. Analysis of low complexity motion estimation algorithms for H.264 video compression standard［C］. Proceedings of the International MultiConference of Engineers and Computer Scientists，2009:18-20.

[14] XIANG D, CHEN J ZH, ZHOU J L. An adaptive adjustment algorithm of midium search range for H. 264［J］. Hua Zhong Univ. of Sci. & Tech. (Natural Science Edition),2008,36(5):46-48.(in Chinese)

[15] DING Y, SONG X H, YAN SH, et al.. Improvements of UMHexagonS algorithm based on fast motion estimation［J］. Data Acquisition & Processing, 2009，24(5)：660-663. (in Chinese)