Pixel anomalous

Although hyperspectral images contain a lot of information, the quality of the raw measurements is often affected by noise or by instrumental variations that hamper the analysis. Typical problems encountered in image measurements are the high noise level, the presence of intense and irregularly shaped baseline contributions or the existence of anomalous pixel spectra (dead pixels or outliers) that may influ-... 

Detection and Suppression of Anomalous Pixels or Anomalous Spectral Readings... 

Post Correction Nonuniformity. The PCNU is the standard deviation of the output after the nonuniformity correction process (see Section 10.4.4, PCNU). We are generally allowed to exclude some pixels from the standard deviation calculation - but any excluded pixels must be declared to be defective. That means that we have some latitude in the PCNU process - we may make PCNU better by excluding anomalous pixels - but at the cost of having more defective pixels. If the spec is very sfringent, we may need to devise an algorithm that finds the best compromise between PCNU and the number of defects. 

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