Abstract
Pixel purity index (PPI) is a very popular endmember finding algorithm due to its availability in ENVI software. It is also very useful technique to find a feasible set of potential target signal sources without prior knowledge. This paper presents a new application of PPI to detection of significant bands by orthogonal projection (OP), referred to as PPI-based band detection (PPI-BD). Its idea is to take advantage of the band sequential (BSQ) format of data acquisition to process PPI band-by-band in a progressive manner, so that band significance can be detected by rapid changes in PPI counts as new bands are progressively processed.
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