Active dictionary learning for image representation

Tong Wu; Anand D. Sarwate; Waheed U. Bajwa

doi:10.1117/12.2180018

22 May 2015 Active dictionary learning for image representation

Tong Wu, Anand D. Sarwate, Waheed U. Bajwa

Proceedings Volume 9468, Unmanned Systems Technology XVII; 946809 (2015) https://doi.org/10.1117/12.2180018
Event: SPIE Defense + Security, 2015, Baltimore, MD, United States

Abstract

Sparse representations of images in overcomplete bases (i.e., redundant dictionaries) have many applications in computer vision and image processing. Recent works have demonstrated improvements in image representations by learning a dictionary from training data instead of using a predefined one. But learning a sparsifying dictionary can be computationally expensive in the case of a massive training set. This paper proposes a new approach, termed active screening, to overcome this challenge. Active screening sequentially selects subsets of training samples using a simple heuristic and adds the selected samples to a "learning pool," which is then used to learn a newer dictionary for improved representation performance. The performance of the proposed active dictionary learning approach is evaluated through numerical experiments on real-world image data; the results of these experiments demonstrate the effectiveness of the proposed method.

Citation Download Citation

Tong Wu, Anand D. Sarwate, and Waheed U. Bajwa "Active dictionary learning for image representation", Proc. SPIE 9468, Unmanned Systems Technology XVII, 946809 (22 May 2015); https://doi.org/10.1117/12.2180018

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