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annotate servlet/src/digilib/image/JAIDocuImage.java @ 543:919e008ab1fb digilibPDF

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more steps towards more standard java.util.concurrent design
author robcast
date Thu, 14 Oct 2010 14:24:33 +0200
parents e758a49258e8
children 686086d6e6d6
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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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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.Image;
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24 import java.awt.Rectangle;
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25 import java.awt.RenderingHints;
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26 import java.awt.image.RenderedImage;
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27 import java.awt.image.renderable.ParameterBlock;
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28 import java.io.File;
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29 import java.io.IOException;
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30 import java.io.OutputStream;
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31 import java.util.ArrayList;
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32 import java.util.Enumeration;
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33 import java.util.Iterator;
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34 import java.util.List;
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35
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36 import javax.media.jai.BorderExtender;
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37 import javax.media.jai.Interpolation;
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38 import javax.media.jai.JAI;
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39 import javax.media.jai.KernelJAI;
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40 import javax.media.jai.ParameterBlockJAI;
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41 import javax.media.jai.RenderedOp;
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42 import javax.media.jai.operator.TransposeDescriptor;
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43 import javax.media.jai.operator.TransposeType;
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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
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52 /** A DocuImage implementation using Java Advanced Imaging Library. */
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53 public class JAIDocuImage extends DocuImageImpl {
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54
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55 protected RenderedImage img;
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57 protected Interpolation interpol = null;
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58
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59 /*
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60 * static { // we could set our own tile cache size here TileCache tc =
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61 * JAI.createTileCache(100*1024*1024);
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62 * JAI.getDefaultInstance().setTileCache(tc); }
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63 */
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64
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65 public boolean isSubimageSupported() {
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66 return true;
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67 }
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68
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69 /*
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70 * Real setQuality implementation. Creates the correct Interpolation.
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71 */
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72 public void setQuality(int qual) {
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73 quality = qual;
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74 // setup interpolation quality
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75 if (qual > 1) {
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76 logger.debug("quality q2");
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77 interpol = Interpolation.getInstance(Interpolation.INTERP_BICUBIC);
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78 } else if (qual == 1) {
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79 logger.debug("quality q1");
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80 interpol = Interpolation.getInstance(Interpolation.INTERP_BILINEAR);
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81 } else {
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82 logger.debug("quality q0");
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83 interpol = Interpolation.getInstance(Interpolation.INTERP_NEAREST);
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84 }
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85 }
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86
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87 /* returns a list of supported image formats */
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88 @SuppressWarnings("unchecked") // ImageCodec.getCodecs() returns a naked Enumeration
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89 public Iterator<String> getSupportedFormats() {
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90 Enumeration<ImageCodec> codecs = ImageCodec.getCodecs();
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91 List<String> formats = new ArrayList<String>();
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92 for (ImageCodec codec = codecs.nextElement(); codecs.hasMoreElements(); codec = codecs
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93 .nextElement()) {
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94 logger.debug("known format:"+codec.getFormatName());
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95 formats.add(codec.getFormatName());
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96 }
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97 logger.debug("tilecachesize:"
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98 + JAI.getDefaultInstance().getTileCache().getMemoryCapacity());
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99 return formats.iterator();
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100 }
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101
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102 /* Check image size and type and store in ImageFile f */
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103 public boolean identify(ImageFile imgf) throws IOException {
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104 // try parent method first
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105 if (super.identify(imgf)) {
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106 return true;
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107 }
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108 // fileset to store the information
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109 ImageFileset imgfs = imgf.getParent();
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110 File f = imgf.getFile();
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111 if (f == null) {
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112 throw new IOException("File not found!");
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113 }
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114 /*
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115 * try JAI
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116 */
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117 logger.debug("identifying (JAI) " + f);
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118 try {
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119 RenderedOp img = JAI.create("fileload", f.getAbsolutePath());
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120 ImageSize d = new ImageSize(img.getWidth(), img.getHeight());
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121 imgf.setSize(d);
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122 String t = FileOps.mimeForFile(f);
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123 imgf.setMimetype(t);
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124 // logger.debug(" format:"+t);
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125 if (imgfs != null) {
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126 imgfs.setAspect(d);
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127 }
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128 logger.debug("image size: " + imgf.getSize());
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129 return true;
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130 } catch (Exception e) {
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131 throw new FileOpException("ERROR: unknown image file format!");
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132 }
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133 }
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134
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135 /* Load an image file into the Object. */
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136 public void loadImage(ImageFile f) throws FileOpException {
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137 img = JAI.create("fileload", f.getFile().getAbsolutePath());
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138 if (img == null) {
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139 throw new FileOpException("Unable to load File!");
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140 }
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141 mimeType = f.getMimetype();
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142 }
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143
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144 /* Load an image file into the Object. */
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145 public void loadSubimage(ImageFile f, Rectangle region, int subsample)
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146 throws FileOpException {
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147 logger.debug("loadSubimage");
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148 img = JAI.create("fileload", f.getFile().getAbsolutePath());
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149 if ((region.width < img.getWidth())
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150 || (region.height < img.getHeight())) {
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151 // setup Crop
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152 ParameterBlock cp = new ParameterBlock();
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153 cp.addSource(img);
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154 cp.add((float) region.x);
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155 cp.add((float) region.y);
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156 cp.add((float) region.width);
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157 cp.add((float) region.height);
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158 logger.debug("loadSubimage: crop");
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159 img = JAI.create("crop", cp);
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160 }
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161 if (subsample > 1) {
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162 float sc = 1f / subsample;
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163 ParameterBlockJAI sp = new ParameterBlockJAI("scale");
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164 sp.addSource(img);
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165 sp.setParameter("xScale", sc);
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166 sp.setParameter("yScale", sc);
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167 sp.setParameter("interpolation", Interpolation
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168 .getInstance(Interpolation.INTERP_NEAREST));
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169 // scale
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170 logger.debug("loadSubimage: scale");
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171 img = JAI.create("scale", sp);
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172 mimeType = f.getMimetype();
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173 }
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174 }
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175
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176 /* Write the current image to an OutputStream. */
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177 public void writeImage(String mt, OutputStream ostream)
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178 throws FileOpException {
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179 try {
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180 // setup output
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181 ParameterBlock pb3 = new ParameterBlock();
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182 pb3.addSource(img);
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183 pb3.add(ostream);
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184 if (mt == "image/jpeg") {
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185 pb3.add("JPEG");
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186 } else if (mt == "image/png") {
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187 pb3.add("PNG");
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188 } else {
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189 // unknown mime type
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190 throw new FileOpException("Unknown mime type: " + mt);
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191 }
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192 // render output
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193 JAI.create("encode", pb3);
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194
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195 } catch (IOException e) {
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196 throw new FileOpException("Error writing image.");
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197 }
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198 }
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199
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200 /**
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201 * The width of the curent image in pixel.
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202 *
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203 * @return Image width in pixels.
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204 */
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205 public int getWidth() {
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206 if (img != null) {
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207 return img.getWidth();
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208 }
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209 return 0;
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210 }
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211
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212 /**
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213 * The height of the curent image in pixel.
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214 *
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215 * @return Image height in pixels.
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216 */
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217 public int getHeight() {
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218 if (img != null) {
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219 return img.getHeight();
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220 }
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221 return 0;
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222 }
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223
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224 /* scales the current image */
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225 public void scale(double scale, double scaleY) throws ImageOpException {
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226 logger.debug("scale");
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227 if ((scale < 1) && (img.getColorModel().getPixelSize() == 1)
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228 && (quality > 0)) {
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229 /*
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230 * "SubsampleBinaryToGray" for downscaling BW
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231 */
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232 scaleBinary((float) scale);
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233 } else if ((scale <= 0.5) && (quality > 1)) {
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234 /*
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235 * blur and "Scale" for downscaling color images
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236 */
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237 if ((scale <= 0.5) && (quality > 1)) {
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238 int bl = (int) Math.floor(1 / scale);
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239 // don't blur more than 3
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240 blur(Math.min(bl, 3));
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241 }
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242 scaleAll((float) scale);
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243 } else {
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244 /*
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245 * "Scale" for the rest
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246 */
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247 scaleAll((float) scale);
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248 }
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249
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250 // DEBUG
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251 logger.debug("SCALE: " + scale + " ->" + img.getWidth() + "x"
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252 + img.getHeight());
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253
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254 }
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255
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256 public void scaleAll(float scale) throws ImageOpException {
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257 RenderedImage scaledImg;
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258 // DEBUG
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259 logger.debug("scaleAll: " + scale);
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260 ParameterBlockJAI param = new ParameterBlockJAI("Scale");
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261 param.addSource(img);
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262 param.setParameter("xScale", scale);
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263 param.setParameter("yScale", scale);
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264 param.setParameter("interpolation", interpol);
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265 // hint with border extender
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266 RenderingHints hint = new RenderingHints(JAI.KEY_BORDER_EXTENDER,
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267 BorderExtender.createInstance(BorderExtender.BORDER_COPY));
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268 // scale
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269 scaledImg = JAI.create("Scale", param, hint);
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270
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271 if (scaledImg == null) {
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272 throw new ImageOpException("Unable to scale");
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273 }
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274 img = scaledImg;
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275 }
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276
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277 public void blur(int radius) throws ImageOpException {
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278 RenderedImage blurredImg;
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279 int klen = Math.max(radius, 2);
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280 logger.debug("blur: " + klen);
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281 int ksize = klen * klen;
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282 float f = 1f / ksize;
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283 float[] kern = new float[ksize];
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284 for (int i = 0; i < ksize; i++) {
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285 kern[i] = f;
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286 }
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287 KernelJAI blur = new KernelJAI(klen, klen, kern);
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288 ParameterBlockJAI param = new ParameterBlockJAI("Convolve");
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289 param.addSource(img);
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290 param.setParameter("kernel", blur);
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291 // hint with border extender
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292 RenderingHints hint = new RenderingHints(JAI.KEY_BORDER_EXTENDER,
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293 BorderExtender.createInstance(BorderExtender.BORDER_COPY));
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294 blurredImg = JAI.create("Convolve", param, hint);
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295 if (blurredImg == null) {
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296 throw new ImageOpException("Unable to scale");
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297 }
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298 img = blurredImg;
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299 }
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300
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301 public void scaleBinary(float scale) throws ImageOpException {
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302 RenderedImage scaledImg;
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303 // DEBUG
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304 logger.debug("scaleBinary: " + scale);
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305 ParameterBlockJAI param = new ParameterBlockJAI("SubsampleBinaryToGray");
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306 param.addSource(img);
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307 param.setParameter("xScale", scale);
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308 param.setParameter("yScale", scale);
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309 // hint with border extender
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310 RenderingHints hint = new RenderingHints(JAI.KEY_BORDER_EXTENDER,
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311 BorderExtender.createInstance(BorderExtender.BORDER_COPY));
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312 // scale
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313 scaledImg = JAI.create("SubsampleBinaryToGray", param, hint);
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314 if (scaledImg == null) {
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315 throw new ImageOpException("Unable to scale");
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316 }
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317 img = scaledImg;
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318 }
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319
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320 /* crops the current image */
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321 public void crop(int x_off, int y_off, int width, int height)
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322 throws ImageOpException {
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323 // setup Crop
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324 ParameterBlock param = new ParameterBlock();
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325 param.addSource(img);
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326 param.add((float) x_off);
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327 param.add((float) y_off);
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328 param.add((float) width);
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329 param.add((float) height);
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330 RenderedImage croppedImg = JAI.create("crop", param);
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331
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332 logger.debug("CROP: " + x_off + "," + y_off + ", " + width + ","
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333 + height + " ->" + croppedImg.getWidth() + "x"
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334 + croppedImg.getHeight());
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335 // DEBUG
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336
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337 if (croppedImg == null) {
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338 throw new ImageOpException("Unable to crop");
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339 }
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340 img = croppedImg;
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341 }
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342
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343 /* rotates the current image */
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344 public void rotate(double angle) throws ImageOpException {
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345 RenderedImage rotImg;
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346 // convert degrees to radians
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347 double rangle = Math.toRadians(angle);
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348 double x = img.getWidth() / 2;
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349 double y = img.getHeight() / 2;
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350
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351 // optimize rotation by right angles
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352 TransposeType rotOp = null;
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353 if (Math.abs(angle - 0) < epsilon) {
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354 // 0 degree
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355 return;
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356 } else if (Math.abs(angle - 90) < epsilon) {
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357 // 90 degree
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358 rotOp = TransposeDescriptor.ROTATE_90;
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359 } else if (Math.abs(angle - 180) < epsilon) {
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360 // 180 degree
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361 rotOp = TransposeDescriptor.ROTATE_180;
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362 } else if (Math.abs(angle - 270) < epsilon) {
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363 // 270 degree
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364 rotOp = TransposeDescriptor.ROTATE_270;
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365 } else if (Math.abs(angle - 360) < epsilon) {
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366 // 360 degree
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367 return;
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368 }
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369 if (rotOp != null) {
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370 // use Transpose operation
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371 ParameterBlock pb = new ParameterBlock();
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372 pb.addSource(img);
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373 pb.add(rotOp);
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374 rotImg = JAI.create("transpose", pb);
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375 } else {
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376 // setup "normal" rotation
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377 ParameterBlock param = new ParameterBlock();
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378 param.addSource(img);
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379 param.add((float) x);
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380 param.add((float) y);
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381 param.add((float) rangle);
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382 param.add(interpol);
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383
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384 rotImg = JAI.create("rotate", param);
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385 }
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386
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387 logger.debug("ROTATE: " + x + "," + y + ", " + angle + " (" + rangle
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388 + ")" + " ->" + rotImg.getWidth() + "x" + rotImg.getHeight());
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389 // DEBUG
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390
79
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391 if (rotImg == null) {
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392 throw new ImageOpException("Unable to rotate");
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393 }
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394 img = rotImg;
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395 }
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396
466
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397 /*
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398 * mirrors the current image works only horizontal and vertical
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399 */
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400 public void mirror(double angle) throws ImageOpException {
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401 RenderedImage mirImg;
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402 // only mirroring by right angles
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403 TransposeType rotOp = null;
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404 if (Math.abs(angle) < epsilon) {
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405 // 0 degree
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406 rotOp = TransposeDescriptor.FLIP_HORIZONTAL;
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407 } else if (Math.abs(angle - 90) < epsilon) {
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408 // 90 degree
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409 rotOp = TransposeDescriptor.FLIP_VERTICAL;
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410 } else if (Math.abs(angle - 180) < epsilon) {
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411 // 180 degree
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412 rotOp = TransposeDescriptor.FLIP_HORIZONTAL;
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413 } else if (Math.abs(angle - 270) < epsilon) {
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414 // 270 degree
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415 rotOp = TransposeDescriptor.FLIP_VERTICAL;
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416 } else if (Math.abs(angle - 360) < epsilon) {
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417 // 360 degree
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418 rotOp = TransposeDescriptor.FLIP_HORIZONTAL;
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419 }
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420 // use Transpose operation
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421 ParameterBlock param = new ParameterBlock();
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422 param.addSource(img);
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423 param.add(rotOp);
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424 mirImg = JAI.create("transpose", param);
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425
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426 if (mirImg == null) {
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427 throw new ImageOpException("Unable to flip");
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428 }
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429 img = mirImg;
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430 }
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431
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432 /* contrast and brightness enhancement */
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433 public void enhance(float mult, float add) throws ImageOpException {
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434 RenderedImage enhImg;
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435 double[] ma = { mult };
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436 double[] aa = { add };
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437 // use Rescale operation
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438 ParameterBlock param = new ParameterBlock();
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439 param.addSource(img);
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440 param.add(ma);
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441 param.add(aa);
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442 enhImg = JAI.create("rescale", param);
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443
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444 logger.debug("ENHANCE: *" + mult + ", +" + add + " ->"
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445 + enhImg.getWidth() + "x" + enhImg.getHeight());
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446 // DEBUG
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447
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448 if (enhImg == null) {
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449 throw new ImageOpException("Unable to enhance");
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450 }
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451 img = enhImg;
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452 }
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453
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454 /*
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455 * (non-Javadoc)
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456 *
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457 * @see digilib.image.DocuImage#enhanceRGB(float[], float[])
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458 */
466
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459 public void enhanceRGB(float[] rgbm, float[] rgba) throws ImageOpException {
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460 RenderedImage enhImg;
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461 int nb = rgbm.length;
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462 double[] ma = new double[nb];
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463 double[] aa = new double[nb];
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464 for (int i = 0; i < nb; i++) {
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465 ma[i] = rgbm[i];
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466 aa[i] = rgba[i];
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467 }
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468 // use Rescale operation
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469 ParameterBlock param = new ParameterBlock();
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470 param.addSource(img);
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471 param.add(ma);
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472 param.add(aa);
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473 enhImg = JAI.create("rescale", param);
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474
466
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475 logger.debug("ENHANCE_RGB: *" + rgbm + ", +" + rgba + " ->"
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476 + enhImg.getWidth() + "x" + enhImg.getHeight());
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477 // DEBUG
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478
101
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479 if (enhImg == null) {
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480 throw new ImageOpException("Unable to enhanceRGB");
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481 }
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482 img = enhImg;
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483 }
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484
466
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485 /*
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486 * (non-Javadoc)
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487 *
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488 * @see digilib.image.DocuImage#dispose()
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489 */
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490 public void dispose() {
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491 img = null;
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492 }
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493
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494 }