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Proceedings Paper

Incremental learning in automatic target recognition
Author(s): Chaitanya Raju; Karthik Mahesh Varadarajan; Aditya Kothari; Hieu Tat Nguyen; Jacob Yadegar; Jonathan Mills
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Paper Abstract

ATR in two dimensional images is valuable for precision guidance, battlefield awareness and surveillance applications. Current ATR methods are largely data-driven and as a result, their recognition accuracy relies on the quality of training dataset. These methods fail to reliably recognize new target types and targets in new backgrounds and/or atmospheric conditions. Thus, there is a need for an ATR solution that can constantly update itself with information from new data samples (samples may belong to existing classes, background clutter or new target classes). In the paper, this problem is addressed in two steps: 1) Incremental learning with Fully Adaptive Approximate Nearest Neighbor Classifier (FAAN) - A novel data structure is designed to allow incremental learning in approximate nearest neighbor classifier. New data samples are assimilated at reduced complexity and memory without retraining on existing data samples, 2) Data Categorization using Data Effectiveness Measure (DEM) - DEM of a data sample is a degree to which each sample belongs to a local cluster of samples. During incremental learning, DEM is used to filter out redundant samples and outliers, thereby reducing computational complexity and avoiding data imbalance issues. The performance of FAAN is compared with proprietary Bagging-based Incremental Decision Tree (ABAFOR) implementation. Tests performed on Army ATR database with over 37,000 samples shows that while classification accuracy of FAAN is comparable to ABAFOR (both close to 95%), the process of incremental learning is significantly quicker.

Paper Details

Date Published: 4 May 2009
PDF: 9 pages
Proc. SPIE 7335, Automatic Target Recognition XIX, 73350X (4 May 2009); doi: 10.1117/12.819949
Show Author Affiliations
Chaitanya Raju, UtopiaCompression Corp. (United States)
Karthik Mahesh Varadarajan, UtopiaCompression Corp. (United States)
Aditya Kothari, UtopiaCompression Corp. (United States)
Hieu Tat Nguyen, UtopiaCompression Corp. (United States)
Jacob Yadegar, UtopiaCompression Corp. (United States)
Jonathan Mills, U.S. Army Aviation and Missile Command (United States)

Published in SPIE Proceedings Vol. 7335:
Automatic Target Recognition XIX
Firooz A. Sadjadi; Abhijit Mahalanobis, Editor(s)

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