南京大学学报(自然科学版) ›› 2015, Vol. 51 ›› Issue (2): 257263.
黄毅1,陈湘军,1,阮雅端1,陈启美1
Huang Yi1,Chen Xiangjun2,1, Ruan Yaduan1, Chen Qi-mei1
摘要: 车型识别分类,对低/高速行车道划分、流量统计,特别是超长/重、危险品车的识别具有现实意义。实验室曾提出的基于尺度不变特征转换SIFT、方向梯度直方图HoG视频检测方法抗干扰能力弱,在因道路环境差、网络拥塞随机造成图像模糊时,往往误判。为此,论文在机理上,分析比较了上述分类算法与特征白化、稀疏编码算法的局限或优势,提出了适应低清晰度视频的“白化-稀疏特征”车型分类算法。该分类算法采取PCA白化技术特征数据预处理、超完备基的凸优化迭代,从而获得稀疏编码特征数据。经与SIFT-SVM算法的现场图像检测比较,其在图像模糊条件时的分类准确率也能达到90%,一般优于93%,均耗时约0.04s。
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