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- Low power compressive sensing for hyperspectral imageryPublication . Nascimento, Jose; Véstias, MárioHyperspectral imaging instruments allow remote Earth exploration by measuring hundreds of spectral bands at very narrow channels of a given spatial area. The resulting hyperspectral data cube typically comprises several gigabytes. Such extremely large volumes of data introduces problems in its transmission to Earth due to limited communication bandwidth. As a result, the applicability of data compression techniques to hyperspectral images have received increasing attention. This paper, presents a study of the power and time consumption of a parallel implementation for a spectral compressive acquisition method on a Jetson TX2 platform. The conducted experiments have been performed to demonstrate the applicability of these methods for onboard processing. The results show that by using this low energy consumption GPU and integer data type is it possible to obtain real-time performance with a very limited power requirement while maintaining the methods accuracy.
- Hyperspectral compressive sensing with a system-on-chip FPGAPublication . Nascimento, Jose; Véstias, Mário; Martín, GabrielAdvances in hyperspectral sensors have led to a significantly increased capability for high-quality data. This trend calls for the development of new techniques to enhance the way that such unprecedented volumes of data are stored, processed, and transmitted to the ground station. An important approach to deal with massive volumes of information is an emerging technique, called compressive sensing, which acquires directly the compressed signal instead of acquiring the full dataset. Thus, reducing the amount of data that needs to be measured, transmitted, and stored in first place. In this article, a hardware/software implementation in a system-on-chip (SoC) field-programmable gate array (FPGA) for compressive sensing is proposed. The proposed hardware/software architecture runs the compressive sensing algorithm with a unitary compression rate over an airborne visible/infrared imaging spectrometer sensor image with 512 lines, 614 samples, and 224 bands in 0.35 s. The proposed system runs 49× and 216× faster than na embedded 256-cores GPU of a Jetson TX2 board and the ARM of the SoC FPGA, respectively. In terms of energy, the proposed architecture requires around 100× less energy.