Author:	Annalisa Cappello (annalisa.cap@katamail.com)
Advisor:	Prof. Sebastiano Battiato (battiato@dmi.unict.it)
History:	This plugin was implemented in July 2005
Works with:	8-bit grayscale images
ImageJ's version:	1.33u (used to develop this plugin)
Source:	HighpassFilters_.java
Installation:	Download HighpassFilters_.java to the plugins folder and compile it with the "Compile and Run" command. Restart ImageJ to add the "HighpassFilter" command to the Plugins menu. To apply the highpass filters to a stack of images download and compile HighpassStack_.java, developed by Bjoern Alex (bjoern.alex@gmail.com).
Description:	This plugin implements three types of highpass filters: ideal, Butterworth and Gaussian
Usage:	Here is a brief description: 1) Select a filter (ideal, Butterworth or Gaussian); 2) Click on the OK button; 3) Insert the cutoff frequency; 4) Insert the order of filter (only for Butterworth filter); 5) Click on the OK button to apply the filter to the image.
Downloads:	Annalisa Cappello, Estensione software ImageJ con tecniche di enhancement nel dominio della frequenza
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