Source Code Cross Referenced for CombineTransform.java in  » GIS » GeoTools-2.4.1 » org » geotools » image » jai » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » GIS » GeoTools 2.4.1 » org.geotools.image.jai 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         *    GeoTools - OpenSource mapping toolkit
03:         *    http://geotools.org
04:         *    (C) 2003-2006, Geotools Project Managment Committee (PMC)
05:         *    (C) 2003, Institut de Recherche pour le Développement
06:         *
07:         *    This library is free software; you can redistribute it and/or
08:         *    modify it under the terms of the GNU Lesser General Public
09:         *    License as published by the Free Software Foundation; either
10:         *    version 2.1 of the License, or (at your option) any later version.
11:         *
12:         *    This library is distributed in the hope that it will be useful,
13:         *    but WITHOUT ANY WARRANTY; without even the implied warranty of
14:         *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15:         *    Lesser General Public License for more details.
16:         */
17:        package org.geotools.image.jai;
18:
19:        /**
20:         * Transforms the sample values for one pixel during a "{@link Combine Combine}" operation.
21:         * The method {@link #transformSamples} is invoked by {@link Combine#computeRect
22:         * Combine.computeRect(...)} just before the sample values are combined as
23:         *
24:         * <code>values[0]*row[0] + values[1]*row[1] + values[2]*row[2] + ... + row[sourceBands]</code>.
25:         *
26:         * This interface provides a hook where non-linear transformations can be performed before the
27:         * linear one. For example, the {@code transformSamples} method could substitutes some
28:         * values by their logarithm.
29:         *
30:         * @since 2.1
31:         * @source $URL: http://svn.geotools.org/geotools/tags/2.4.1/modules/library/coverage/src/main/java/org/geotools/image/jai/CombineTransform.java $
32:         * @version $Id: CombineTransform.java 20970 2006-08-11 07:53:22Z jgarnett $
33:         * @author Martin Desruisseaux
34:         */
35:        public interface CombineTransform {
36:            /**
37:             * Transforms the sample values for one pixel before the linear combinaison.
38:             *
39:             * @param values The sampel values to transformation.
40:             *               Transformation are performed in-place.
41:             */
42:            public abstract void transformSamples(final double[] values);
43:
44:            /**
45:             * Returns {@code true} if the transformation performed by {@link #transformSamples}
46:             * do not depends on the ordering of samples in the {@code values} array. This method
47:             * can returns {@code true} if the {@code transformSamples(double[])} implementation
48:             * meet the following conditions:
49:             *
50:             * <ul>
51:             *   <li>The transformation is separable, i.e. the output value {@code values[i]} depends
52:             *       only on the input value {@code values[i]} for all <var>i</var>.</li>
53:             *   <li>The transformation do not depends on the value of the index <var>i</var>.
54:             * </ul>
55:             *
56:             * For example, the following implementations meets the above mentioned conditions:
57:             *
58:             * <blockquote><pre>
59:             * for (int i=0; i<values.length; i++) {
60:             *     values[i] = someFunction(values[i]);
61:             * }
62:             * </pre></blockquote>
63:             *
64:             * A {@code true} value will allows some optimisations inside the
65:             * {@link Combine#computeRect Combine.computeRect(...)} method. This method
66:             * may conservatly returns {@code false} if this information is unknow.
67:             */
68:            public abstract boolean isSeparable();
69:        }
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