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Proceedings Paper

Towards adaptive thresholding for sub-pixel co-registration and anomaly detection
Author(s): Jeannine A. Abiva; Tesfaye G-Michael; Rodney G. Roberts
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Paper Abstract

Automated change detection (ACD) is a technique that automatically discerns any area of change when comparing two images of the same geographic location over different moments in time. Within the ACD processing stream, co-registration ensures the areas depicted in two images coincide. The difficulty in co-registering sonar images of the sea floor can arise from a difference in vehicle trajectories, low resolution, and the presence of noise. Moreover, the changing features of the sea floor can further add to the difficulty. The successful co-registration of sonar images is important when comparing images, and is thus required in areas such as change detection and mosaicing. In this effort, a three-step co-registration process is used: co-registration by navigational alignment, fine-scale co-registration using SIFT, and local co-registration that corrects navigational differences. In this paper, we focus on the final step where phase alignment occurs. To eliminate unreliable unwrapped phase data, we introduce a novel histogram based adaptive thresholding technique which rejects errors in phase alignment occurring in the across-track direction of the vehicle. Further, an adaptive thresholding technique is applied to the change-map generated following the co-registration stage. To isolate pixels of interest related to anomalies or targets, a thresholding method is applied in conjunction with principal and independent component analysis (PCA and ICA).

We will demonstrate the effectiveness of these adaptive thresholding techniques in sub-pixel co-registration and target detection.

Paper Details

Date Published: 3 May 2017
PDF: 9 pages
Proc. SPIE 10182, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XXII, 101820M (3 May 2017); doi: 10.1117/12.2264836
Show Author Affiliations
Jeannine A. Abiva, Naval Surface Warfare Ctr. Panama City Div. (United States)
Tesfaye G-Michael, Naval Surface Warfare Ctr. Panama City Div. (United States)
Rodney G. Roberts, Florida State Univ. (United States)

Published in SPIE Proceedings Vol. 10182:
Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XXII
Steven S. Bishop; Jason C. Isaacs, Editor(s)

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