EURASIP Journal on Advances in Signal Processing

Table 1 Spectral angle-based similarity scores between the endmembers extracted by different implementations of PPI and the selected USGS reference signatures.

From: FPGA Implementation of the Pixel Purity Index Algorithm for Remotely Sensed Hyperspectral Image Analysis

USGS	ENVI	PPI	Our FPGA-based
mineral	software	approximation	PPI
Alunite	0.084	0.084	0.084
Buddingtonite	0.071	0.068	0.068
Calcite	0.089	0.089	0.089
Kaolinite	0.136	0.132	0.132
Muscovite	0.092	0.081	0.081

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