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Open AccessArticle

Improving the Accuracy of Two-Color Multiview (2CMV) Advanced Geospatial Information (AGI) Products Using Unsupervised Feature Learning and Optical Flow

1
School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, AZ 85281, USA
2
School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ 85281, USA
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(11), 2605; https://doi.org/10.3390/s19112605
Received: 5 May 2019 / Revised: 3 June 2019 / Accepted: 3 June 2019 / Published: 8 June 2019
(This article belongs to the Special Issue Synthetic Aperture Radar (SAR) Techniques and Applications)
In two-color multiview (2CMV) advanced geospatial information (AGI) products, temporal changes in synthetic aperture radar (SAR) images acquired at different times are detected, colorized, and overlaid on an initial image such that new features are represented in cyan, and features that have disappeared are represented in red. Accurate detection of temporal changes in 2CMV AGI products can be challenging because of ’speckle noise’ susceptibility and false positives that result from small orientation differences between objects imaged at different times. Accordingly, 2CMV products are often dominated by colored pixels when changes are detected via simple pixel-wise cross-correlation. The state-of-the-art in SAR image processing demonstrates that generating efficient 2CMV products, while accounting for the aforementioned problem cases, has not been well addressed. We propose a methodology to address the aforementioned two problem cases. Before detecting temporal changes, speckle and smoothing filters mitigate the effects of speckle noise. To detect temporal changes, we propose using unsupervised feature learning algorithms in conjunction with optical flow algorithms that track the motion of objects across time in small regions of interest. The proposed framework for distinguishing between actual motion and misregistration can lead to more accurate and meaningful change detection and improve object extraction from an SAR AGI product. View Full-Text
Keywords: SAR; 2CMV; change detection; optical flow; k-means; K-SVD SAR; 2CMV; change detection; optical flow; k-means; K-SVD
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Kanberoglu, B.; Frakes, D. Improving the Accuracy of Two-Color Multiview (2CMV) Advanced Geospatial Information (AGI) Products Using Unsupervised Feature Learning and Optical Flow. Sensors 2019, 19, 2605.

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