计算机科学 ›› 2021, Vol. 48 ›› Issue (9): 146-152.doi: 10.11896/jsjkx.200800200
张新峰, 宋博
ZHANG Xin-feng, SONG Bo
摘要: 行人重识别旨在跨摄像头条件下,从目标数据库中检索出特定的行人目标,其在视频监控领域有重要的应用价值。目前其研究难点为样本图像类内差异大、类间差异小,因此如何设计并训练深度神经网络对行人图片提取一个判别力更强的特征成为了其关键。针对以往研究只单独进行全局特征或局部特征学习的不足,提出了一种联合全局特征和局部特征学习的网络结构,该结构能够同时提取全局特征和具有较强区分力的局部细节特征;针对每部分局部特征对行人特征描述的重要性不同,文中提出了一种局部特征的融合方式,该方法能够自适应地生成各个局部特征的权重,最后将融合后的局部特征和全局特征结合使行人特征得到更全面的表征;另外,针对以往的基于难样本挖掘的三元组损失具有优化目标模糊的特点,提出了一种改进的基于难样本挖掘的三元组损失函数。文中分别在行人重识别主流数据集Market-1501和DukeMTMC-reID上验证了所提方法的有效性,其mAP值分别达到了82.16%和74.02%,Rank-1值分别达到了92.75%和86.8%。
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