Comparison of novelty detection methods for multispectral images in rover-based planetary exploration missions

Autor: James F. Bell, S. Jacob, Heni Ben Amor, Kiri L. Wagstaff, Chiman Kwan, Danika Wellington, Paul Horton, Brian D. Bue, Hannah Kerner
Rok vydání: 2020
Předmět:
Zdroj: Data Mining and Knowledge Discovery. 34:1642-1675
ISSN: 1573-756X
1384-5810
DOI: 10.1007/s10618-020-00697-6
Popis: Science teams for rover-based planetary exploration missions like the Mars Science Laboratory Curiosity rover have limited time for analyzing new data before making decisions about follow-up observations. There is a need for systems that can rapidly and intelligently extract information from planetary instrument datasets and focus attention on the most promising or novel observations. Several novelty detection methods have been explored in prior work for three-channel color images and non-image datasets, but few have considered multispectral or hyperspectral image datasets for the purpose of scientific discovery. We compared the performance of four novelty detection methods—Reed Xiaoli (RX) detectors, principal component analysis (PCA), autoencoders, and generative adversarial networks (GANs)—and the ability of each method to provide explanatory visualizations to help scientists understand and trust predictions made by the system. We show that pixel-wise RX and autoencoders trained with structural similarity (SSIM) loss can detect morphological novelties that are not detected by PCA, GANs, and mean squared error autoencoders, but that the latter methods are better suited for detecting spectral novelties—i.e., the best method for a given setting depends on the type of novelties that are sought. Additionally, we find that autoencoders provide the most useful explanatory visualizations for enabling users to understand and trust model detections, and that existing GAN approaches to novelty detection may be limited in this respect.
Databáze: OpenAIRE
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