sigmastretch
Apply a Sigma Stretch to a cube.
This application is a translation of the Davinci script "sstretch" (Arizona
State University, http://davinci.asu.edu). This program will stretch a cube
according to the following formula for each pixel in the image:
new_dn = (old_dn - avg) * (variance / stddev)
where avg and stddev are the statistical average and standard
deviation of all valid pixels in the current band. The variance is a
user-specified parameter, VARIANCE, that affects how much the histogram of
the image is widened, and does not represent the statistical variance of the
image.
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History
| Travis Addair | 2011-09-08 | Original translation of Davinci's "sstretch" script into Isis 3. |
| Steven Lambright | 2012-02-24 | This program now takes advantage of multiple global processing threads. |
