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Multi-layer local energy patterns for texture representation and classification
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DOI：10.1007/s00371-016-1220-5.png)
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Motivated by the recent success of deep networks in providing effective and abstract image representations, in this paper, a multi-layer architecture called the multi-layer local energy patterns (ML-LEP) is proposed for texture representation and classification. The proposed approach follows a multi-layer convolutional neural network paradigm and is built upon the single-layer local energy pattern (LEP) approach, a statistical histogram-based method for texture representation. An important aspect of the proposed multi-layer method compared to other deep convolutional architectures is bypassing the computationally expensive learning stage using fixed filters. As such, the proposed training-free network circumvents the need for large data for learning system parameters. An extensive investigation is carried out to determine the merits of different nonlinear operators in the proposed architecture. For this purpose, different nonlinearities including an energy-based nonlinearity, the absolute operator as well as the rectifier functions are extensively investigated and compared against each other. Extensive experiments conducted on three challenging databases of KTH-TIPS, KTH-TIPS2-a and the UIUC indicate that the extension of the LEP method to the multi-layer LEP is effective and leads to better performance. Moreover, the proposed ML-LEP approach is compared to several other well-known descriptors in the field, achieving the best reported performance on the KTH-TIPS and the KTH-TIPS2-a databases despite being training-free.
Keyword:
Deep learning
Convolutional neural networks
Texture representation
Multi-layer local energy patterns
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