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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.4.2_13) on Tue Jun 05 11:36:23 GMT-05:00 2007 --><META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><TITLE>Histogram (Geotools 2.3.x 2.3.2 API)</TITLE><META NAME="keywords" CONTENT="org.geotools.coverage.processing.operation.Histogram class"><META NAME="keywords" CONTENT="GT_SYNTHETIC_PROPERTY_HISTOGRAM"><META NAME="keywords" CONTENT="computeOnGeophysicsValues()"><META NAME="keywords" CONTENT="getProperties()"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="Histogram (Geotools 2.3.x 2.3.2 API)";}</SCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=3 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/Histogram.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../../org/geotools/coverage/processing/operation/GradientMagnitude.html" title="class in org.geotools.coverage.processing.operation"><B>PREV CLASS</B></A> <A HREF="../../../../../org/geotools/coverage/processing/operation/Interpolate.html" title="class in org.geotools.coverage.processing.operation"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../../index.html" target="_top"><B>FRAMES</B></A> <A HREF="Histogram.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../../../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../../../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: <A HREF="#nested_classes_inherited_from_class_org.geotools.coverage.processing.OperationJAI">NESTED</A> | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: <A HREF="#field_detail">FIELD</A> | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">org.geotools.coverage.processing.operation</FONT><BR>Class Histogram</H2><PRE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../../../org/geotools/coverage/processing/AbstractOperation.html" title="class in org.geotools.coverage.processing">AbstractOperation</A> <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../../../org/geotools/coverage/processing/Operation2D.html" title="class in org.geotools.coverage.processing">Operation2D</A> <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../../../org/geotools/coverage/processing/OperationJAI.html" title="class in org.geotools.coverage.processing">OperationJAI</A> <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by"><B>Histogram</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD>Operation, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/Serializable.html" title="class or interface in java.io">Serializable</A></DD></DL><HR><DL><DT>public class <B>Histogram</B><DT>extends <A HREF="../../../../../org/geotools/coverage/processing/OperationJAI.html" title="class in org.geotools.coverage.processing">OperationJAI</A></DL><P>* This operation simply wraps JAI Extrema operations described by <A HREF="http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/HistogramDescriptor.html" title="class or interface in javax.media.jai.operator"><CODE>HistogramDescriptor</CODE></A> inside a GeoTools operation in order to make it spatial-aware. <p> For the moment this is a very simple wrap. Plans on the 2.4 and successive versions of this operation are to add the ability to to use spatial ROIs and to specific Spatial subsampling. As of now, ROI has to be a Java2D <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/Shape.html" title="class or interface in java.awt"><CODE>Shape</CODE></A> subclass and the parameters to control x and y subsamplings got to be Integer, which means pixel-aware. <p> For more information on how the underlying <A HREF="http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/JAI.html" title="class or interface in javax.media.jai"><CODE>JAI</CODE></A> operators works you can have a look here: <a href="http://download.java.net/media/jai/javadoc/1.1.3/jai-apidocs/javax/media/jai/operator/HistogramDescriptor.html">HistogramDescriptor</a> <a href="http://download.java.net/media/jai/javadoc/1.1.3/jai-apidocs/javax/media/jai/Histogram.html>Histogram</a> <p> <strong>How to use this operation</strong> Here is a very simple example on how to use this operation in order to get the <A HREF="http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/Histogram.html" title="class or interface in javax.media.jai"><CODE>Histogram</CODE></A> of the source coverage. <code> final OperationJAI op=new Histogram(); //one could also do what follows //final Operation2D op=(Operation2D) new DefaultProcessor(null).getOperation("Extrema"); ParameterValueGroup params = op.getParameters(); params.parameter("Source").setValue(coverage); coverage=(GridCoverage2D) op.doOperation(params,null); System.out.println(((double[])coverage.getProperty("histogram"))); </code><P><P><DL><DT><B>Since:</B></DT> <DD>2.3.1</DD><DT><B>Author:</B></DT> <DD>Simone Giannecchini</DD><DT><B>See Also:</B><DD><A HREF="http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/Histogram.html" title="class or interface in javax.media.jai"><CODE>Histogram</CODE></A>, <A HREF="../../../../../serialized-form.html#org.geotools.coverage.processing.operation.Histogram">Serialized Form</A></DL><HR><P><!-- ======== NESTED CLASS SUMMARY ======== --><A NAME="nested_class_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2">⌨️ 快捷键说明
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