Dr. Lars Aurdal Profile

Dr. Lars Aurdal

at Norwegian Defence Research Establishment

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Publications (6)

Proceedings Article | 20 September 2020 Paper

Investigating robustness of adversarial camouflage (AC) for naval vessels

Kristin Hammarstrøm Løkken, Lars Aurdal, Alvin Brattli, Hans Christian Palm

Proceedings Volume 11543, 115430G (2020) https://doi.org/10.1117/12.2573676

KEYWORDS: Camouflage, Gallium nitride, Neural networks, Visualization

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The use of camouflage is widespread in the biological domain, and has also been used extensively by armed forces around the world in order to make visual detection and classification of objects of military interest more difficult. The recent advent of ever more autonomous military agents raises the questions of whether camouflage can have a similar effect on autonomous agents as it has on human agents, and if so, what kind of camouflage will be effective against such adversaries. In previous works, we have shown that image classifiers based on deep neural networks can be confused by patterns generated by generative adversarial networks (GANs). Specifically, we trained a classifier to distinguish between two ship types, military and civilian. We then used a GAN to generate patterns that, when overlaid on parts of military vessels (frigates), made the classifier confuse the modified frigates with civilian vessels. We termed such patterns "adversarial camouflage" (AC) since these patterns effectively camouflage the frigates with respect to the classifier. The type of adversarial attack described in our previous work is a so-called white box attack. This term describes adversarial attacks that are devised given full knowledge of the classifier under attack. This is as opposed to black box attacks, which describe attacks on unknown classifiers. In our context, the ultimate goal is to design a GAN that is capable of black box attacks, in other words: a GAN that will generate AC that has effect across a wide range of neural network classifiers. In the current work, we study techniques to improve the robustness of our GAN-based approach by investigating whether a GAN can be trained to fool a selection of several neural network-based classifiers, or reduce the confidence of the classifications to a degree which makes them unreliable. Our results indicate that it is indeed possible to weaken a wider range of neural network classifiers by training the generator on several classifiers.

Proceedings Article | 24 April 2020 Paper

Robustness of adversarial camouflage (AC) for naval vessels

Kristin Hammarstrøm Løkken, Alvin Brattli, Hans Christian Palm, Lars Aurdal, Runhild Aae Klausen

Proceedings Volume 11394, 113940W (2020) https://doi.org/10.1117/12.2558506

KEYWORDS: Camouflage, Neural networks, Image filtering, Evolutionary algorithms, Optical sensors

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Proceedings Article | 19 September 2019 Presentation + Paper

Adversarial camouflage for naval vessels

Lars Aurdal, Kristin Hammarstrøm Løkken, Runhild Aae Klausen, Alvin Brattli, Hans Christian Palm

Proceedings Volume 11169, 111690K (2019) https://doi.org/10.1117/12.2532756

KEYWORDS: Camouflage, Neural networks, Image analysis, Detection and tracking algorithms, Sensors, Network architectures, Evolutionary algorithms, Visualization, Artificial intelligence

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Proceedings Article | 9 October 2018 Paper

Supporting artificial intelligence with artificial images

Lars Aurdal, Alvin Brattli, Eirik Glimsdal, Runhild Aae Klausen, Kristin Hammarstrøm Løkken, Hans Christian Palm

Proceedings Volume 10794, 107940M (2018) https://doi.org/10.1117/12.2324969

KEYWORDS: Infrared imaging, Long wavelength infrared, Neural networks, Image processing, Image segmentation, Infrared signatures, Network architectures

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Proceedings Article | 5 October 2018 Paper

Identification of mixed substances using a random forest regressor to classify THz absorbance spectra

Arthur van Rheenen, Lars Aurdal, Helle Emilia Nystad, Magnus Haakestad

Proceedings Volume 10800, 1080009 (2018) https://doi.org/10.1117/12.2325529

KEYWORDS: Terahertz radiation, Absorbance, Statistical analysis, Explosives, Spectroscopy, Absorption, Imaging spectroscopy

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Proceedings Article | 19 January 2009 Paper

Character recognition in the presence of occluding clutter

Knut Fosseide, Lars Aurdal

Proceedings Volume 7247, 72470I (2009) https://doi.org/10.1117/12.805855

KEYWORDS: Optical character recognition, Detection and tracking algorithms, Associative arrays, Binary data, Image filtering, Error analysis, X band, Image processing, Logic, Patents

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Showing 5 of 6 publications

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