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annotate servlet/src/digilib/image/JAIDocuImage.java @ 573:beeedf90cb81 stream

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Merge from HEAD fd2ef7e461198ef4a9d9a02459be2057038d600d
author robcast
date Wed, 22 Dec 2010 09:54:34 +0100
parents 50f291d808b1 fd2ef7e46119
children 790cbfb58b52
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1 /* JAIDocuImage -- Image class implementation using JAI (Java Advanced Imaging)
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3 Digital Image Library servlet components
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5 Copyright (C) 2001, 2002, 2003 Robert Casties (robcast@mail.berlios.de)
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7 This program is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2 of the License, or (at your
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10 option) any later version.
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11
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12 Please read license.txt for the full details. A copy of the GPL
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13 may be found at http://www.gnu.org/copyleft/lgpl.html
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15 You should have received a copy of the GNU General Public License
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16 along with this program; if not, write to the Free Software
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 */
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20
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21 package digilib.image;
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22
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23 import java.awt.Rectangle;
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24 import java.awt.RenderingHints;
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25 import java.awt.image.RenderedImage;
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26 import java.awt.image.renderable.ParameterBlock;
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27 import java.io.File;
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28 import java.io.IOException;
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29 import java.io.OutputStream;
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30 import java.util.ArrayList;
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31 import java.util.Enumeration;
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32 import java.util.Iterator;
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33 import java.util.List;
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34
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35 import javax.media.jai.BorderExtender;
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36 import javax.media.jai.Interpolation;
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37 import javax.media.jai.JAI;
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38 import javax.media.jai.KernelJAI;
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39 import javax.media.jai.ParameterBlockJAI;
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40 import javax.media.jai.RenderedOp;
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41 import javax.media.jai.operator.TransposeDescriptor;
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42 import javax.media.jai.operator.TransposeType;
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43 import javax.servlet.ServletException;
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44
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45 import com.sun.media.jai.codec.ImageCodec;
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46
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47 import digilib.io.FileOpException;
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48 import digilib.io.FileOps;
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49 import digilib.io.ImageFile;
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50 import digilib.io.ImageFileset;
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51 import digilib.io.ImageInput;
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52
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53 /** A DocuImage implementation using Java Advanced Imaging Library. */
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54 /**
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55 * @author casties
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56 *
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57 */
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58 public class JAIDocuImage extends ImageInfoDocuImage {
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59
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60 protected RenderedImage img;
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61
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62 protected Interpolation interpol = null;
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63
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64 /*
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65 * static { // we could set our own tile cache size here TileCache tc =
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66 * JAI.createTileCache(100*1024*1024);
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67 * JAI.getDefaultInstance().setTileCache(tc); }
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68 */
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69
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70 public boolean isSubimageSupported() {
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71 return true;
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72 }
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74 /*
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75 * Real setQuality implementation. Creates the correct Interpolation.
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76 */
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77 public void setQuality(int qual) {
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78 quality = qual;
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79 // setup interpolation quality
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80 if (qual > 1) {
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81 logger.debug("quality q2");
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82 interpol = Interpolation.getInstance(Interpolation.INTERP_BICUBIC);
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83 } else if (qual == 1) {
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84 logger.debug("quality q1");
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85 interpol = Interpolation.getInstance(Interpolation.INTERP_BILINEAR);
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86 } else {
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87 logger.debug("quality q0");
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88 interpol = Interpolation.getInstance(Interpolation.INTERP_NEAREST);
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89 }
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90 }
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91
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92 /* returns a list of supported image formats */
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93 @SuppressWarnings("unchecked") // ImageCodec.getCodecs() returns a naked Enumeration
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94 public Iterator<String> getSupportedFormats() {
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95 Enumeration<ImageCodec> codecs = ImageCodec.getCodecs();
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96 List<String> formats = new ArrayList<String>();
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97 for (ImageCodec codec = codecs.nextElement(); codecs.hasMoreElements(); codec = codecs
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98 .nextElement()) {
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99 logger.debug("known format:"+codec.getFormatName());
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100 formats.add(codec.getFormatName());
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101 }
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102 logger.debug("tilecachesize:"
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103 + JAI.getDefaultInstance().getTileCache().getMemoryCapacity());
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104 return formats.iterator();
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105 }
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106
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107 /* Check image size and type and store in ImageFile f */
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108 public ImageInput identify(ImageFile imageFile) throws IOException {
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109 // try parent method first
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110 ImageInput imf = super.identify(imageFile);
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111 if (imf != null) {
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112 return imf;
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113 }
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114 // fileset to store the information
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115 ImageFileset imgfs = imageFile.getParent();
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116 File f = imageFile.getFile();
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117 if (f == null) {
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118 throw new IOException("File not found!");
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119 }
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120 /*
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121 * try JAI
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122 */
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123 logger.debug("identifying (JAI) " + f);
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124 try {
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125 RenderedOp img = JAI.create("fileload", f.getAbsolutePath());
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126 ImageSize d = new ImageSize(img.getWidth(), img.getHeight());
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127 imageFile.setSize(d);
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128 String t = FileOps.mimeForFile(f);
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129 imageFile.setMimetype(t);
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130 // logger.debug(" format:"+t);
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131 if (imgfs != null) {
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132 imgfs.setAspect(d);
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133 }
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134 logger.debug("image size: " + imageFile.getSize());
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135 return imageFile;
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136 } catch (Exception e) {
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137 throw new FileOpException("ERROR: unknown image file format!");
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138 }
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139 }
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140
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141 /* Load an image file into the Object. */
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142 public void loadImage(ImageFile f) throws FileOpException {
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143 img = JAI.create("fileload", f.getFile().getAbsolutePath());
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144 if (img == null) {
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145 throw new FileOpException("Unable to load File!");
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146 }
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147 mimeType = f.getMimetype();
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148 }
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150 /* Load an image file into the Object. */
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151 public void loadSubimage(ImageFile f, Rectangle region, int subsample)
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152 throws FileOpException {
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153 logger.debug("loadSubimage");
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154 img = JAI.create("fileload", f.getFile().getAbsolutePath());
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155 if ((region.width < img.getWidth())
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156 || (region.height < img.getHeight())) {
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157 // setup Crop
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158 ParameterBlock cp = new ParameterBlock();
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159 cp.addSource(img);
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160 cp.add((float) region.x);
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161 cp.add((float) region.y);
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162 cp.add((float) region.width);
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163 cp.add((float) region.height);
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164 logger.debug("loadSubimage: crop");
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165 img = JAI.create("crop", cp);
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166 }
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167 if (subsample > 1) {
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168 float sc = 1f / subsample;
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169 ParameterBlockJAI sp = new ParameterBlockJAI("scale");
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170 sp.addSource(img);
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171 sp.setParameter("xScale", sc);
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172 sp.setParameter("yScale", sc);
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173 sp.setParameter("interpolation", Interpolation
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174 .getInstance(Interpolation.INTERP_NEAREST));
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175 // scale
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176 logger.debug("loadSubimage: scale");
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177 img = JAI.create("scale", sp);
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178 mimeType = f.getMimetype();
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179 }
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180 }
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181
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182 /* Write the current image to an OutputStream. */
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183 public void writeImage(String mt, OutputStream ostream) throws ServletException, ImageOpException {
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184 try {
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185 // setup output
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186 ParameterBlock pb3 = new ParameterBlock();
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187 pb3.addSource(img);
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188 pb3.add(ostream);
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189 if (mt == "image/jpeg") {
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190 pb3.add("JPEG");
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191 } else if (mt == "image/png") {
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192 pb3.add("PNG");
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193 } else {
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194 // unknown mime type
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195 throw new ImageOpException("Unknown mime type: " + mt);
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196 }
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197 // render output
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198 JAI.create("encode", pb3);
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199
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200 } catch (RuntimeException e) {
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201 // JAI likes to throw RuntimeExceptions
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202 throw new ServletException("Error writing image:", e);
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203 }
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204 }
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205
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206 /* returns the current image size
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207 * @see digilib.image.DocuImageImpl#getSize()
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208 */
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209 public ImageSize getSize() {
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210 ImageSize is = null;
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211 // TODO: do we want to cache imgSize?
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212 int h = 0;
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213 int w = 0;
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214 if (img != null) {
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215 // get size from image
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216 h = img.getHeight();
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217 w = img.getWidth();
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218 is = new ImageSize(w, h);
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219 }
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220 return is;
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221 }
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222
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223 /* scales the current image */
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224 public void scale(double scale, double scaleY) throws ImageOpException {
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225 logger.debug("scale");
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226 if ((scale < 1) && (img.getColorModel().getPixelSize() == 1)
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227 && (quality > 0)) {
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228 /*
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229 * "SubsampleBinaryToGray" for downscaling BW
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230 */
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231 scaleBinary((float) scale);
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232 } else if ((scale <= 0.5) && (quality > 1)) {
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233 /*
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234 * blur and "Scale" for downscaling color images
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235 */
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236 if ((scale <= 0.5) && (quality > 1)) {
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237 int bl = (int) Math.floor(1 / scale);
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238 // don't blur more than 3
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239 blur(Math.min(bl, 3));
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240 }
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241 scaleAll((float) scale);
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242 } else {
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243 /*
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244 * "Scale" for the rest
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245 */
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246 scaleAll((float) scale);
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247 }
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248
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249 // DEBUG
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250 logger.debug("SCALE: " + scale + " ->" + img.getWidth() + "x"
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251 + img.getHeight());
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252
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253 }
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254
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255 public void scaleAll(float scale) throws ImageOpException {
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256 RenderedImage scaledImg;
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257 // DEBUG
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258 logger.debug("scaleAll: " + scale);
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259 ParameterBlockJAI param = new ParameterBlockJAI("Scale");
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260 param.addSource(img);
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261 param.setParameter("xScale", scale);
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262 param.setParameter("yScale", scale);
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263 param.setParameter("interpolation", interpol);
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264 // hint with border extender
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265 RenderingHints hint = new RenderingHints(JAI.KEY_BORDER_EXTENDER,
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266 BorderExtender.createInstance(BorderExtender.BORDER_COPY));
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267 // scale
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268 scaledImg = JAI.create("Scale", param, hint);
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269
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270 if (scaledImg == null) {
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271 throw new ImageOpException("Unable to scale");
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272 }
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273 img = scaledImg;
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274 }
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275
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276 public void blur(int radius) throws ImageOpException {
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277 RenderedImage blurredImg;
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278 int klen = Math.max(radius, 2);
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279 logger.debug("blur: " + klen);
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280 int ksize = klen * klen;
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281 float f = 1f / ksize;
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282 float[] kern = new float[ksize];
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283 for (int i = 0; i < ksize; i++) {
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284 kern[i] = f;
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285 }
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286 KernelJAI blur = new KernelJAI(klen, klen, kern);
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287 ParameterBlockJAI param = new ParameterBlockJAI("Convolve");
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288 param.addSource(img);
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289 param.setParameter("kernel", blur);
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290 // hint with border extender
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291 RenderingHints hint = new RenderingHints(JAI.KEY_BORDER_EXTENDER,
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292 BorderExtender.createInstance(BorderExtender.BORDER_COPY));
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293 blurredImg = JAI.create("Convolve", param, hint);
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294 if (blurredImg == null) {
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295 throw new ImageOpException("Unable to scale");
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296 }
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297 img = blurredImg;
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298 }
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299
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300 public void scaleBinary(float scale) throws ImageOpException {
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301 RenderedImage scaledImg;
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302 // DEBUG
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303 logger.debug("scaleBinary: " + scale);
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304 ParameterBlockJAI param = new ParameterBlockJAI("SubsampleBinaryToGray");
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305 param.addSource(img);
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306 param.setParameter("xScale", scale);
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307 param.setParameter("yScale", scale);
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308 // hint with border extender
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309 RenderingHints hint = new RenderingHints(JAI.KEY_BORDER_EXTENDER,
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310 BorderExtender.createInstance(BorderExtender.BORDER_COPY));
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311 // scale
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312 scaledImg = JAI.create("SubsampleBinaryToGray", param, hint);
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313 if (scaledImg == null) {
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314 throw new ImageOpException("Unable to scale");
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315 }
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316 img = scaledImg;
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317 }
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318
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319 /* crops the current image */
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320 public void crop(int x_off, int y_off, int width, int height)
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321 throws ImageOpException {
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322 // setup Crop
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323 ParameterBlock param = new ParameterBlock();
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324 param.addSource(img);
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325 param.add((float) x_off);
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326 param.add((float) y_off);
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327 param.add((float) width);
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328 param.add((float) height);
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329 RenderedImage croppedImg = JAI.create("crop", param);
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330
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331 logger.debug("CROP: " + x_off + "," + y_off + ", " + width + ","
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332 + height + " ->" + croppedImg.getWidth() + "x"
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333 + croppedImg.getHeight());
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334 img = croppedImg;
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335 }
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336
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337 /* rotates the current image */
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338 public void rotate(double angle) throws ImageOpException {
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339 RenderedImage rotImg;
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340 // convert degrees to radians
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341 double rangle = Math.toRadians(angle);
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342 double x = img.getWidth() / 2;
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343 double y = img.getHeight() / 2;
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344
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345 // optimize rotation by right angles
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346 TransposeType rotOp = null;
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347 if (Math.abs(angle - 0) < epsilon) {
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348 // 0 degree
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349 return;
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350 } else if (Math.abs(angle - 90) < epsilon) {
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351 // 90 degree
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352 rotOp = TransposeDescriptor.ROTATE_90;
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353 } else if (Math.abs(angle - 180) < epsilon) {
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354 // 180 degree
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355 rotOp = TransposeDescriptor.ROTATE_180;
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356 } else if (Math.abs(angle - 270) < epsilon) {
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357 // 270 degree
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358 rotOp = TransposeDescriptor.ROTATE_270;
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359 } else if (Math.abs(angle - 360) < epsilon) {
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360 // 360 degree
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361 return;
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362 }
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363 if (rotOp != null) {
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364 // use Transpose operation
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365 ParameterBlock pb = new ParameterBlock();
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366 pb.addSource(img);
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367 pb.add(rotOp);
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368 rotImg = JAI.create("transpose", pb);
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369 } else {
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370 // setup "normal" rotation
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371 ParameterBlock param = new ParameterBlock();
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372 param.addSource(img);
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373 param.add((float) x);
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374 param.add((float) y);
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375 param.add((float) rangle);
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376 param.add(interpol);
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377
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378 rotImg = JAI.create("rotate", param);
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379 }
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380
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381 logger.debug("ROTATE: " + x + "," + y + ", " + angle + " (" + rangle
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382 + ")" + " ->" + rotImg.getWidth() + "x" + rotImg.getHeight());
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383 img = rotImg;
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384 }
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385
466
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386 /*
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387 * mirrors the current image works only horizontal and vertical
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388 */
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389 public void mirror(double angle) throws ImageOpException {
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390 RenderedImage mirImg;
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391 // only mirroring by right angles
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392 TransposeType rotOp = null;
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393 if (Math.abs(angle) < epsilon) {
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394 // 0 degree
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395 rotOp = TransposeDescriptor.FLIP_HORIZONTAL;
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396 } else if (Math.abs(angle - 90) < epsilon) {
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397 // 90 degree
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398 rotOp = TransposeDescriptor.FLIP_VERTICAL;
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399 } else if (Math.abs(angle - 180) < epsilon) {
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400 // 180 degree
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401 rotOp = TransposeDescriptor.FLIP_HORIZONTAL;
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402 } else if (Math.abs(angle - 270) < epsilon) {
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403 // 270 degree
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404 rotOp = TransposeDescriptor.FLIP_VERTICAL;
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405 } else if (Math.abs(angle - 360) < epsilon) {
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406 // 360 degree
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407 rotOp = TransposeDescriptor.FLIP_HORIZONTAL;
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408 }
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409 // use Transpose operation
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410 ParameterBlock param = new ParameterBlock();
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411 param.addSource(img);
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412 param.add(rotOp);
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413 mirImg = JAI.create("transpose", param);
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414
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415 if (mirImg == null) {
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416 throw new ImageOpException("Unable to flip");
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417 }
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418 img = mirImg;
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419 }
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420
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421 /* contrast and brightness enhancement */
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422 public void enhance(float mult, float add) throws ImageOpException {
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423 RenderedImage enhImg;
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424 double[] ma = { mult };
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425 double[] aa = { add };
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426 // use Rescale operation
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427 ParameterBlock param = new ParameterBlock();
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428 param.addSource(img);
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429 param.add(ma);
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430 param.add(aa);
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431 enhImg = JAI.create("rescale", param);
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432
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433 logger.debug("ENHANCE: *" + mult + ", +" + add + " ->"
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434 + enhImg.getWidth() + "x" + enhImg.getHeight());
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435 // DEBUG
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436 img = enhImg;
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437 }
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438
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439 /*
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440 * (non-Javadoc)
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441 *
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442 * @see digilib.image.DocuImage#enhanceRGB(float[], float[])
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443 */
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444 public void enhanceRGB(float[] rgbm, float[] rgba) throws ImageOpException {
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445 RenderedImage enhImg;
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446 int nb = rgbm.length;
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447 double[] ma = new double[nb];
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448 double[] aa = new double[nb];
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449 for (int i = 0; i < nb; i++) {
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450 ma[i] = rgbm[i];
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451 aa[i] = rgba[i];
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452 }
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453 // use Rescale operation
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454 ParameterBlock param = new ParameterBlock();
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455 param.addSource(img);
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456 param.add(ma);
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457 param.add(aa);
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458 enhImg = JAI.create("rescale", param);
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459
466
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460 logger.debug("ENHANCE_RGB: *" + rgbm + ", +" + rgba + " ->"
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461 + enhImg.getWidth() + "x" + enhImg.getHeight());
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462 img = enhImg;
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463 }
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464
466
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465 /*
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466 * (non-Javadoc)
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467 *
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468 * @see digilib.image.DocuImage#dispose()
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469 */
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470 public void dispose() {
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471 img = null;
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472 }
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473
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474 }