Extraction of advanced geospatial intelligence (AGI) from commercial synthetic aperture radar imagery

Kanberoglu, Berkay

doi:10.1117/12.2262359

Cited by 1 publication

(1 citation statement)

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“…This stage has two main parts: extraction and elimination. Extraction is performed by an adaptive thresholding method that is similar to the one used in [32]. In this stage, the thresholding is performed on the original images to extract/label objects.…”

Section: Methodsmentioning

confidence: 99%

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

Kanberoglu

2019

Sensors

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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.

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Section: Methodsmentioning

confidence: 99%