Support Histogram Contrast Stretching in GeoTools Rasters
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Key: GEOT-1391
URL: http://jira.codehaus.org/browse/GEOT-1391
Project: GeoTools
Issue Type: Improvement
Components: core coverage
Affects Versions: 2.4.0
Reporter: Saul Farber
Assignee: Martin Desruisseaux
Fix For: 2.5-M0
I'd like to support histogram-statistical contrast stretching on rasters,
specifically in ArcSDE, but possibly as a general filter for GridCoverages
See http://www.fas.org/irp/imint/docs/rst/Sect1/Sect1_12a.html
The idea is that you create a histogram of the colors a particular image, then
calculate the mean pixel color and the standard deviation around that mean.
You then consider the minimum pixel value of mean-(n*stddev) and the maximum
pixel value of mean+(n*stddev). You then set the min pix val to image-output
color zero, and the max pix val to image-output-color 255. Then you
interpolate the remaining colors in the image into the 'stretched' color-space,
causing higher contrast for the densest portion of the color-space.
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