Flatfield Correction

Features:

Performs flat field correction on the entire dataset. This post-imaging procedure cancels the effects of image artifacts caused by variations in the detector or the light sources resulting in a more uniform (flatfield) output with more uniform color and brightness across the frame.

Steps:

1.      Open a file.

2.     Select Data Corrections → Flatfield correction. A pop-up dialogue window will ask to identify a reference spectrum.

3.     Click OK and draw an area that needs to be corrected. A valid ROI has these characteristics:

a.      Topographically flat

b.      Spectrally flat (uniform spectral response)

c.      Shows a strong signal source to reduce the impact of random noise           

References:

Roberts, D. A., Yamaguchi, Y., and Lyon, R., "Comparison of various techniques for calibration of AIS data" in Proc. of the 2nd Airborne Imaging Spectrometer Data Analysis Workshop, 1986, JPL Publication, 86-35, pp. 21-30.