INFINITY ANALYZE User's Manual - Spectra Services

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Lumenera INFINITY ANALYZE User’s Manual Release 6.0.0 3.7.5 Unsharp Use the Unsharp command to do the generalized unsharp mask filtering for the active image. The example below illustrates the process. Page 84 Copyright © 2006-2011
Release 6.0.0 Lumenera INFINITY ANALYZE User’s Manual 3.7.6 Unsharp Options Use the Unsharp Options command to set up parameters for Unsharp. Unsharp masking is a traditional film compositing technique used to sharpen edges in and improve the contrast of an image. INFINITY ANALYZE generalizes this technique to make it more powerful. The generalized unsharp masking, also known as latitude reduction, uses a Gaussian filter to separate an image into two images, one is the lowfrequency part, called background image, and the other is the high-frequency part, called contrast image. The background image, representing the latitude or dynamic range of the image, may be reduced by multiplying a coefficient smaller than unity. Latitude reduction actually improves the contrast without enhancing noise. If the image is free of noise, the contrast image may also be multiplied by a coefficient greater than unity to augment contrast in a straightforward manner. This process is referred to as high boost. Finally there is a visual psychology factor to be considered. Boosted contrast in dark areas of an image may be interpreted as noise. To make the processed image appear natural, the intensities of background image pixels can be used as weights when the contrast image is being added back to the background image to form the output image of the latitude reduction operation. The process of adding contrast image to the background image is called back-projection. Copyright © 2006-2011 Page 85
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INFINITY ANALYZE User's Manual - Spectra Services

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