Structural Prior Driven Regularized Deep Learning for Sonar Image Classification
Deep learning has been recently shown to improve performance in the domain of synthetic aperture sonar (SAS) image classification. Given the constant resolution with range of a SAS, it is no surprise that deep learning techniques perform so well. Despite deep learning's recent success, there ar...
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Zusammenfassung: | Deep learning has been recently shown to improve performance in the domain of
synthetic aperture sonar (SAS) image classification. Given the constant
resolution with range of a SAS, it is no surprise that deep learning techniques
perform so well. Despite deep learning's recent success, there are still
compelling open challenges in reducing the high false alarm rate and enabling
success when training imagery is limited, which is a practical challenge that
distinguishes the SAS classification problem from standard image classification
set-ups where training imagery may be abundant. We address these challenges by
exploiting prior knowledge that humans use to grasp the scene. These include
unconscious elimination of the image speckle and localization of objects in the
scene. We introduce a new deep learning architecture which incorporates these
priors with the goal of improving automatic target recognition (ATR) from SAS
imagery. Our proposal -- called SPDRDL, Structural Prior Driven Regularized
Deep Learning -- incorporates the previously mentioned priors in a multi-task
convolutional neural network (CNN) and requires no additional training data
when compared to traditional SAS ATR methods. Two structural priors are
enforced via regularization terms in the learning of the network: (1)
structural similarity prior -- enhanced imagery (often through despeckling)
aids human interpretation and is semantically similar to the original imagery
and (2) structural scene context priors -- learned features ideally encapsulate
target centering information; hence learning may be enhanced via a
regularization that encourages fidelity against known ground truth target
shifts (relative target position from scene center). Experiments on a
challenging real-world dataset reveal that SPDRDL outperforms state-of-the-art
deep learning and other competing methods for SAS image classification. |
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DOI: | 10.48550/arxiv.2010.13317 |