计算机科学 ›› 2020, Vol. 47 ›› Issue (6): 104-113.doi: 10.11896/jsjkx.200200135
王俊茜1,2, 郑文先3, 徐勇1,2
WANG Jun-qian1,2, ZHENG Wen-xian3, XU Yong1,2
摘要： 基于协同表示的分类方法(Collaborative Representation-based Classification,CRC)在诸如人脸识别、物体识别等图像分类任务中取得了良好的效果。CRC利用范数正则化来解决测试样本的线性表示问题,以期得到一个较稳定的数值解。已有研究表明,正则化参数的选择对协同表示的数值稳定性起着非常重要的作用。文中提出了一种新的基于测试样本误差重构的协同表示分类方法 (Test Sample Error Reconstruction Collaborative Representation-based Classification,TSER-CRC)。该方法首先利用较小的正则化参数计算出一个协同表示系数,使其重新构建测试样本,以削弱原始测试样本中的误差或减小原始测试样本与训练样本之间的不一致性;然后,利用较大的正则化参数,并基于重构出的测试样本再次求解协同表示系数,以得出数值较稳定的测试样本与各类别训练样本之间的关系,并以此对测试样本进行分类。该方法有效地减少了由所有训练样本构成的协同子空间所表示的测试样本中存在的误差和异常值,提高了协同表示编码系数的稳定性和图像分类的鲁棒性。通过在5个标准数据集上的实验结果表明,所提方法在图像分类精度方面明显优于传统CRC和其他一些经典的图像分类方法。
中图分类号:
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