Source Code Cross Referenced for PhaseDescriptor.java in  » 6.0-JDK-Modules » Java-Advanced-Imaging » javax » media » jai » operator » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » Java Advanced Imaging » javax.media.jai.operator 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $RCSfile: PhaseDescriptor.java,v $
003:         *
004:         * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
005:         *
006:         * Use is subject to license terms.
007:         *
008:         * $Revision: 1.1 $
009:         * $Date: 2005/02/11 04:57:42 $
010:         * $State: Exp $
011:         */
012:        package javax.media.jai.operator;
013:
014:        import java.awt.RenderingHints;
015:        import java.awt.image.DataBuffer;
016:        import java.awt.image.RenderedImage;
017:        import java.awt.image.renderable.ParameterBlock;
018:        import java.awt.image.renderable.RenderableImage;
019:        import javax.media.jai.JAI;
020:        import javax.media.jai.OperationDescriptorImpl;
021:        import javax.media.jai.ParameterBlockJAI;
022:        import javax.media.jai.PropertyGenerator;
023:        import javax.media.jai.RenderableOp;
024:        import javax.media.jai.RenderedOp;
025:        import javax.media.jai.registry.RenderableRegistryMode;
026:        import javax.media.jai.registry.RenderedRegistryMode;
027:
028:        /**
029:         * An <code>OperationDescriptor</code> describing the "Phase" operation.
030:         *
031:         * <p> The "Phase" operation computes the phase angle of each pixel of a
032:         * complex image.  The source image must have an even number of bands, with
033:         * the even bands (0, 2, ...) representing the real parts and the odd bands
034:         * (1, 3, ...) the imaginary parts of each complex pixel.  The destination
035:         * image has at most half the number of bands of the source image with each
036:         * sample in a pixel representing the phase angle of the corresponding complex
037:         * source sample.  The angular values of the destination image are defined
038:         * for a given sample by the pseudocode:
039:         *
040:         * <pre>dst[x][y][b] = Math.atan2(src[x][y][2*b+1], src[x][y][2*b])</pre>
041:         *
042:         * where the number of bands <i>b</i> varies from zero to one less than the
043:         * number of bands in the destination image.
044:         *
045:         * <p> For integral image datatypes, the result will be rounded and
046:         * scaled so the the "natural" arctangent range [-PI, PI) is remapped into
047:         * the range [0, MAX_VALUE); the result for floating point image datatypes
048:         * is the value returned by the atan2() method.
049:         *
050:         * <p>"Phase" defines a PropertyGenerator that sets the "COMPLEX"
051:         * property of the image to <code>java.lang.Boolean.FALSE</code>, which may
052:         * be retrieved by calling the <code>getProperty()</code> method with
053:         * "COMPLEX" as the property name.
054:         *
055:         * <p><table border=1>
056:         * <caption>Resource List</caption>
057:         * <tr><th>Name</th>        <th>Value</th></tr>
058:         * <tr><td>GlobalName</td>  <td>Phase</td></tr>
059:         * <tr><td>LocalName</td>   <td>Phase</td></tr>
060:         * <tr><td>Vendor</td>      <td>com.sun.media.jai</td></tr>
061:         * <tr><td>Description</td> <td>Computes the phase angle of each pixel of
062:         *                              an image.</td></tr>
063:         * <tr><td>DocURL</td>      <td>http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/PhaseDescriptor.html</td></tr>
064:         * <tr><td>Version</td>     <td>1.0</td></tr>
065:         * </table></p>
066:         *
067:         * <p> No parameters are needed for the "Phase" operation.
068:         *
069:         * @see javax.media.jai.OperationDescriptor
070:         */
071:        public class PhaseDescriptor extends OperationDescriptorImpl {
072:
073:            /**
074:             * The resource strings that provide the general documentation
075:             * and specify the parameter list for this operation.
076:             */
077:            private static final String[][] resources = {
078:                    { "GlobalName", "Phase" },
079:                    { "LocalName", "Phase" },
080:                    { "Vendor", "com.sun.media.jai" },
081:                    { "Description", JaiI18N.getString("PhaseDescriptor0") },
082:                    {
083:                            "DocURL",
084:                            "http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/PhaseDescriptor.html" },
085:                    { "Version", JaiI18N.getString("DescriptorVersion") } };
086:
087:            private static final String[] supportedModes = { "rendered",
088:                    "renderable" };
089:
090:            /** Constructor. */
091:            public PhaseDescriptor() {
092:                super (resources, supportedModes, 1, null, null, null, null);
093:            }
094:
095:            /**
096:             * Validates the input source.
097:             *
098:             * <p> In addition to the standard checks performed by the
099:             * superclass method, this method checks that the source image
100:             * has an even number of bands.
101:             */
102:            protected boolean validateSources(String modeName,
103:                    ParameterBlock args, StringBuffer msg) {
104:                if (!super .validateSources(modeName, args, msg)) {
105:                    return false;
106:                }
107:
108:                if (!modeName.equalsIgnoreCase("rendered"))
109:                    return true;
110:
111:                RenderedImage src = args.getRenderedSource(0);
112:
113:                int bands = src.getSampleModel().getNumBands();
114:
115:                if (bands % 2 != 0) {
116:                    msg.append(getName() + " "
117:                            + JaiI18N.getString("PhaseDescriptor1"));
118:                    return false;
119:                }
120:
121:                return true;
122:            }
123:
124:            /**
125:             * Returns an array of <code>PropertyGenerators</code> implementing
126:             * property inheritance for the "Phase" operation.
127:             *
128:             * @return  An array of property generators.
129:             */
130:            public PropertyGenerator[] getPropertyGenerators(String modeName) {
131:                PropertyGenerator[] pg = new PropertyGenerator[1];
132:                pg[0] = new ComplexPropertyGenerator();
133:                return pg;
134:            }
135:
136:            /**
137:             * Computes the phase angle of each pixel of an image.
138:             *
139:             * <p>Creates a <code>ParameterBlockJAI</code> from all
140:             * supplied arguments except <code>hints</code> and invokes
141:             * {@link JAI#create(String,ParameterBlock,RenderingHints)}.
142:             *
143:             * @see JAI
144:             * @see ParameterBlockJAI
145:             * @see RenderedOp
146:             *
147:             * @param source0 <code>RenderedImage</code> source 0.
148:             * @param hints The <code>RenderingHints</code> to use.
149:             * May be <code>null</code>.
150:             * @return The <code>RenderedOp</code> destination.
151:             * @throws IllegalArgumentException if <code>source0</code> is <code>null</code>.
152:             */
153:            public static RenderedOp create(RenderedImage source0,
154:                    RenderingHints hints) {
155:                ParameterBlockJAI pb = new ParameterBlockJAI("Phase",
156:                        RenderedRegistryMode.MODE_NAME);
157:
158:                pb.setSource("source0", source0);
159:
160:                return JAI.create("Phase", pb, hints);
161:            }
162:
163:            /**
164:             * Computes the phase angle of each pixel of an image.
165:             *
166:             * <p>Creates a <code>ParameterBlockJAI</code> from all
167:             * supplied arguments except <code>hints</code> and invokes
168:             * {@link JAI#createRenderable(String,ParameterBlock,RenderingHints)}.
169:             *
170:             * @see JAI
171:             * @see ParameterBlockJAI
172:             * @see RenderableOp
173:             *
174:             * @param source0 <code>RenderableImage</code> source 0.
175:             * @param hints The <code>RenderingHints</code> to use.
176:             * May be <code>null</code>.
177:             * @return The <code>RenderableOp</code> destination.
178:             * @throws IllegalArgumentException if <code>source0</code> is <code>null</code>.
179:             */
180:            public static RenderableOp createRenderable(
181:                    RenderableImage source0, RenderingHints hints) {
182:                ParameterBlockJAI pb = new ParameterBlockJAI("Phase",
183:                        RenderableRegistryMode.MODE_NAME);
184:
185:                pb.setSource("source0", source0);
186:
187:                return JAI.createRenderable("Phase", pb, hints);
188:            }
189:        }
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