Sarah Chamas
Performance Optimization of Hyperspectral Image Compression Algorithms.
Rel. Enrico Masala. Politecnico di Torino, Corso di laurea magistrale in Communications And Computer Networks Engineering (Ingegneria Telematica E Delle Comunicazioni), 2021
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Abstract
Hyperspectral imaging is widely used in various fields. This thesis refers to a specific remote sensing application. It aims to find and implement an algorithm able to compress hyperspectral images which are used to detect the presence of ice on metallic surfaces. The basic concept is that different materials bring to different spectral signatures, which allows us to recognize them through specific software. A hyperspectral image is obtained with a special camera which collects information of the same spatial scene at different spectral bands, i.e. narrow portions of the electromagnetic spectrum. As a consequence, the amount of data to be processed is huge, and has to be reduced without losing essential information for spectral recognition.
Specifically, according to the state of the art, lossless compression algorithms bring a poor compression ratio even if they preserve totally the original information, while lossy ones achieve better compression, getting rid mostly of spectral and spatial redundancy
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