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- Title
FPGA Implementation of the Pixel Purity Index Algorithm for Remotely Sensed Hyperspectral Image Analysis.
- Authors
González, Carlos; Resano, Javier; Mozos, Daniel; Plaza, Antonio; Valencia, David
- Abstract
Hyperspectral imaging is a new emerging technology in remote sensing which generates hundreds of images, at different wavelength channels, for the same area on the surface of the Earth. Over the last years, many algorithms have been developed with the purpose of finding endmembers, assumed to be pure spectral signatures in remotely sensed hyperspectral data sets. One of the most popular techniques has been the pixel purity index (PPI). This algorithm is very time-consuming. The reconfigurability, compact size, and high computational power of Field programmable gate arrays (FPGAs) make them particularly attractive for exploitation in remote sensing applications with (near) real-time requirements. In this paper, we present an FPGA design for implementation of the PPI algorithm. Our systolic array design includes a DMA and implements a prefetching technique to reduce the penalties due to the I/O communications. We have also included a hardware module for random number generation. The proposed method has been tested using real hyperspectral data collected by NASA's Airborne Visible Infrared Imaging Spectrometer over the Cuprite mining district in Nevada. Experimental results reveal that the proposed hardware system is easily scalable and able to provide accurate results with compact size in (near) real-time, whichmake our reconfigurable system appealing for on-board hyperspectral data processing.
- Subjects
NEVADA; UNITED States; FIELD programmable gate arrays; REMOTE sensing; ALGORITHMS; PIXELS; REMOTE sensing in earth sciences; WAVELENGTHS; AIRBORNE Visible/Infrared Imaging Spectrometer (AVIRIS); REMOTE-sensing images of Earth; UNITED States. National Aeronautics &; Space Administration; EARTH (Planet)
- Publication
EURASIP Journal on Advances in Signal Processing, 2010, p1
- ISSN
1687-6172
- Publication type
Article
- DOI
10.1155/2010/969806