Yimo Guo Guoying Zhao Jie Chen 0001 Matti Pietikäinen Zhengguang Xu A New Gabor Phase Difference Pattern for Face and Ear Recognition. 41-49 2009 CAIP http://dx.doi.org/10.1007/978-3-642-03767-2_5 conf/caip/2009 db/conf/caip/caip2009.html#GuoZCPX09