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Public Lab Wiki documentation



Image Analysis

This is a revision from October 27, 2011 21:49. View all revisions
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Infrared compositing

If you have near-infrared imagery you can composite that imagery with the visible-light imagery to see how healthy the vegetation is.

Contrast adjustments

Stretch the contrast and saturation of your images to see more detail, especially underwater. Read more here:

Decorrelation stretching

Nathan Craig writes: Decorrelation stretching may be a method to consider. Various flavors of the transformation are easily run using the DStretch Plugin for Image J. Several that seemed to represent variability relevant to the case study are included. I use DStretch to help bring out detail in rock art scenes that are highly eroded. However, the method has utility outside of rock art studies. It may be an additional approach to consider when trying to identify pollution or other contaminants.

Here is information on DStretch http://www.dstretch.com/

Here is a paper that describes the transformation http://eospso.gsfc.nasa.gov/eos_homepage/for_scientists/atbd/docs/ASTER/atbd-ast-06.pdf

Fwd: contrast enhancement to view underwater features in aerial photos

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Classification

Using the ratios of Red, Green, and Blue (and possibly Near-infrared), spectral classification attempts to categorize regions of an image by land type.

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