Journal
IEEE TRANSACTIONS ON IMAGE PROCESSING
Volume 24, Issue 10, Pages 3109-3123Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIP.2015.2438548
Keywords
Sparse coding; discriminative dictionary learning; hierarchical method; large scale classification
Funding
- National Basic Research Program of China (973 Program) [2012CB316400]
- National Natural Science Foundation (NSF) of China [61332016, 61025011, 61303160, 61272326]
- University of Macau [MYRG202(Y1-L4)-FST11-WEH]
- 973 Program of China [2015CB352502]
- NSF of China [61272341, 61231002]
- Microsoft Research Asia Collaborative Research Program
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The sparse coding technique has shown flexibility and capability in image representation and analysis. It is a powerful tool in many visual applications. Some recent work has shown that incorporating the properties of task (such as discrimination for classification task) into dictionary learning is effective for improving the accuracy. However, the traditional supervised dictionary learning methods suffer from high computation complexity when dealing with large number of categories, making them less satisfactory in large scale applications. In this paper, we propose a novel multi-level discriminative dictionary learning method and apply it to large scale image classification. Our method takes advantage of hierarchical category correlation to encode multi-level discriminative information. Each internal node of the category hierarchy is associated with a discriminative dictionary and a classification model. The dictionaries at different layers are learnt to capture the information of different scales. Moreover, each node at lower layers also inherits the dictionary of its parent, so that the categories at lower layers can be described with multi-scale information. The learning of dictionaries and associated classification models is jointly conducted by minimizing an overall tree loss. The experimental results on challenging data sets demonstrate that our approach achieves excellent accuracy and competitive computation cost compared with other sparse coding methods for large scale image classification.
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