基于词包模型和SURF局部特征的人脸识别

Face recognition based on BOW and SURF local features

针对传统人脸识别方法实时性差的缺点,提出了一种加速鲁棒性特征(SURF,speed up robust features)和词包模型(BOW,bag-of-word)相结合的人脸识别方法.图像经过预处理后,使用SURF算法自动提取图像的关键点和相应的特征描述符,再进一步用BOW方法将其编成视觉单词作为人脸的局部特征.最后,采用K最邻近结点算法进行分类识别.使用了2个数据集验证了提出的方法——标准CMU-PIE(卡内基梅隆大学——姿势、光照、表情人脸数据库)人脸库和采集的数据库,分别达到了97.5%和99.3%的识别率,而且特征提取的时间少于0.108 s,识别的时间少于0.017 s.结果表明,本文提出的算法不仅精确而且快速,具有更好的稳定性和有效性.

To overcome the limitations of traditional face recognition methods for real-time, a face rec- ognition method which based on speed up robust features and bag-of-word model was proposed. Image after preprocessing, we used SURF to extract key points of images and corresponding feature descriptors au-tomatically. Further, bag-of word model was used to code the descriptors into visual words as local features of the face. Finally, K-Nearest Neighbor algorithm was adopted to recognize the human faces. The proposed method is validated with both CMU-PIE dataset and dataset collected in the laboratory. It can a- chieve 97.50//00 and 99.3%0 recognition rates on these two datasets, respectively. In average, it took less than 0.108 s for feature extraction and less than 0.017 s for matching. The results indicate that the pro- posed method not only precise moreover fast, and had better stability and effectiveness.