Abstract: To deal with the small sample size problem and overcome disadvantage of Gabor feature extraction in face verification，an efficient algorithm based on the Discriminative Common Vector（DCV） and 2D Dual-Tree Complex Wavelet Transform（2D DT-CWT） is proposed.The 2D DT-CWT is utilized to filter the preprocessed image，and then the amplitude coefficients of different scales and different orientations are lexicographically ordered to form its feature vector.The dimensionality of 2D DT-CWT features is usually high，so features are projected into DCV subspace to reduce the dimensionality and enhance the discriminative ability.Finally，verification is accomplished according to client-specific threshold.The experimental results on ORL database and FERET subset demonstrate the effectiveness of the proposed algorithm.

Key words: 2D dual-tree complex wavelet transform, discriminative common vector, face verification, feature extraction

摘要： 针对人脸认证中的小样本问题和Gabor小波特征提取的不足，提出一种有效的人脸认证算法。对预处理后的图像进行2D双树复小波变换，将每幅图像不同尺度下多个方向的小波系数幅值作为特征矢量，表征重要的局部信息；将提取的特征矢量向判别共同矢量空间投影，进一步提取具有判别能力的特征，同时进行降维；根据用户特定阈值进行认证。ORL人脸库和FERET子库上的实验结果验证了算法的有效性。

关键词: 2D双树复小波变换, 判别共同矢量, 人脸认证, 特征提取