基于鉴别字典学习的遮挡人脸姿态识别

Occluded Face Pose Recognition Based on Dictionary Learning with Discrimination Performance

  • 摘要: 利用字典学习与稀疏表示的信号重建与分类的性能,两步字典训练学习方法引入到鲁棒性人脸姿态识别中。首先,将人脸姿态离散化为不同的子空间,使用K-奇异值分解法(K-SVD)为每个子空间训练一个子字典使其对应一个类别;然后,将所有子字典组合成超完备字典;最后,采用基于Gabor特征与稀疏表示的方法进行姿态分类。为了提高字典的分类能力,本文采用两步字典训练学习方法,并在第二步学习中加入类别约束;为了提高算法的鲁棒性,本文重构一个遮挡人脸字典,解决人脸姿态识别中人脸遮挡问题。通过在公开的XJTU、PIE和CAS-PEAL-R1人脸库上的实验结果表明,本文方法在具有光照、噪声和遮挡变化的人脸库识别率均能达到95%左右,基本能达到实际应用的要求。

     

    Abstract: This paper make full use of dictionary learning and sparse representation for signal reconstruction and classification, and present a two-step dictionary learning method and apply it to robust face pose recognition. The proposed approach models the appearance of face images from the subspace via K-SVD that learns the sub-dictionary from a set of images. A combination of the trained sub-dictionaries of all pose classes are used as an over-complete dictionary. Finally, the Gabor features are extracted for sparse representation and classification. In order to improve the classification ability, we put forward a two-step dictionary learning method, and carry out dictionary learning with label constraints in the second step. Additionally, in order to improve robustness against face occlusion, we introduce a pose occlusion dictionary to code the occluded portions of face images. Several experiments were performed on XJTU, PIE, and CAS-PEAL-R1 databases. Recognition results show that the proposed method can achieve a recognition rate of about 95% under illumination, noise, and occlusion variations. It can satisfy the requirements of practical applications.

     

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