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Laplacian Sparse Coding by Incorporating Locality and Non-negativity for Image Classification |
WAN Yuan1 , SHI Ying1 , WU Kefeng2 , CHEN Xiaoli1 |
1.School of Science, Wuhan University of Technology, Wuhan 430070 2.School of Automation, Huazhong University of Science and Technology, Wuhan 430074 |
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Abstract The local relationship between features of images is not taken into account in the traditional sparse coding, it can lead to the instability of encoding. Moreover, some effective features may not be retained via the subtraction operation in the optimization procedure. Aiming at these two problems, a method is proposed, named Laplacian sparse coding by incorporating locality and non-negativity(LN-LSC)for image classification. Firstly, bases near to the local features are chosen to constrain the codes. Then, non-negativity is introduced in Laplacian sparse coding by non-negative matrix factorization. Finally, spatial pyramid division and max pooling are utilized to generate the final representation of images in the pooling step. Multi-class linear SVM is adopted for image classification. The local information between features is preserved by the proposed method, and the offsetting between features is also avoided. Thus, more features are utilized for coding, and the instability of the coding is overcome. Experiments on four public image datasets show the classification accuracy of LN-LSC is higher than that of the state-of-the-art sparse coding algorithms.
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Received: 26 December 2016
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Fund:Supported by National Natural Science Foundation of China(No.81271513) |
About author:: (WAN Yuan, born in 1976, Ph.D., associate professor. Her research interests include pattern recognition, machine learning and image processing.)(SHI Ying(Corresponding author), born in 1991, master student. Her research interests include image processing and pattern recognition.)(WU Kefeng, born in 1992, master student. His research interests include pattern recognition and intelligent control.)(CHEN Xiaoli, born in 1992, master student. Her research interests include image processing and pattern recognition.) |
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