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annotate servlet/src/digilib/image/JAIDocuImage.java @ 196:8125a068af80

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Servlet version 1.18b5 - fix for config file names on non-unix systems
author robcast
date Mon, 08 Dec 2003 16:50:59 +0100
parents 91f28e4fee8f
children 460cd1f18b96
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1 /* JAIDocuImage -- Image class implementation using JAI (Java Advanced Imaging)
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2
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3 Digital Image Library servlet components
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4
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5 Copyright (C) 2001, 2002, 2003 Robert Casties (robcast@mail.berlios.de)
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6
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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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14
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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.RenderingHints;
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24 import java.awt.image.RenderedImage;
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25 import java.awt.image.renderable.ParameterBlock;
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26 import java.io.IOException;
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27 import java.io.OutputStream;
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28
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29 import javax.media.jai.BorderExtender;
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30 import javax.media.jai.Interpolation;
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31 import javax.media.jai.JAI;
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32 import javax.media.jai.KernelJAI;
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33 import javax.media.jai.ParameterBlockJAI;
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34 import javax.media.jai.operator.TransposeDescriptor;
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35 import javax.media.jai.operator.TransposeType;
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36
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37 import digilib.io.ImageFile;
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38 import digilib.io.FileOpException;
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39
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40 /** A DocuImage implementation using Java Advanced Imaging Library. */
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41 public class JAIDocuImage extends DocuImageImpl {
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42
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43 protected RenderedImage img;
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44 protected Interpolation interpol = null;
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45
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46 /* Load an image file into the Object. */
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47 public void loadImage(ImageFile f) throws FileOpException {
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48 System.gc();
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49 img = JAI.create("fileload", f.getFile().getAbsolutePath());
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50 if (img == null) {
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51 throw new FileOpException("Unable to load File!");
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52 }
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53 }
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54
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55 /* Write the current image to an OutputStream. */
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56 public void writeImage(String mt, OutputStream ostream)
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57 throws FileOpException {
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58 try {
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59 // setup output
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60 ParameterBlock pb3 = new ParameterBlock();
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61 pb3.addSource(img);
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62 pb3.add(ostream);
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63 if (mt == "image/jpeg") {
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64 pb3.add("JPEG");
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65 } else if (mt == "image/png") {
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66 pb3.add("PNG");
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67 } else {
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68 // unknown mime type
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69 throw new FileOpException("Unknown mime type: " + mt);
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70 }
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71 // render output
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72 JAI.create("encode", pb3);
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73
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74 } catch (IOException e) {
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75 throw new FileOpException("Error writing image.");
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76 }
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77 }
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78
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79 /* Real setQuality implementation.
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80 * Creates the correct Interpolation.
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81 */
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82 public void setQuality(int qual) {
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83 quality = qual;
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84 // setup interpolation quality
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85 if (qual > 1) {
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86 logger.debug("quality q2");
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87 interpol = Interpolation.getInstance(Interpolation.INTERP_BICUBIC);
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88 } else if (qual == 1) {
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89 logger.debug("quality q1");
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90 interpol = Interpolation.getInstance(Interpolation.INTERP_BILINEAR);
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91 } else {
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92 logger.debug("quality q0");
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93 interpol = Interpolation.getInstance(Interpolation.INTERP_NEAREST);
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94 }
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95 }
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96
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97 /** The width of the curent image in pixel.
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98 * @return Image width in pixels.
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99 */
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100 public int getWidth() {
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101 if (img != null) {
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102 return img.getWidth();
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103 }
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104 return 0;
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105 }
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106
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107 /** The height of the curent image in pixel.
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108 * @return Image height in pixels.
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109 */
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110 public int getHeight() {
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111 if (img != null) {
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112 return img.getHeight();
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113 }
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114 return 0;
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115 }
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116
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117 /* scales the current image */
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118 public void scale(double scale, double scaleY) throws ImageOpException {
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119 if ((scale < 1)
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120 && (img.getColorModel().getPixelSize() == 1)
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121 && (quality > 0)) {
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122 /*
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123 * "SubsampleBinaryToGray" for downscaling BW
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124 */
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125 scaleBinary((float) scale);
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126 } else if ((scale <= 0.5) && (quality > 1)) {
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127 /*
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128 * blur and "Scale" for downscaling color images
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129 */
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130 int subsample = (int) Math.floor(1 / scale);
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131 blur(subsample);
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132 scaleAll((float) scale);
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133 } else {
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134 /*
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135 * "Scale" for the rest
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136 */
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137 scaleAll((float) scale);
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138 }
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139
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140 //DEBUG
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141 logger.debug("SCALE: " + scale + " ->" + img.getWidth() + "x" + img.getHeight());
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142
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143 }
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144
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145 public void scaleAll(float scale) throws ImageOpException {
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146 RenderedImage scaledImg;
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147 //DEBUG
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148 logger.debug("scaleAll: " + scale);
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149 ParameterBlockJAI param = new ParameterBlockJAI("Scale");
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150 param.addSource(img);
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151 param.setParameter("xScale", scale);
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152 param.setParameter("yScale", scale);
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153 param.setParameter("interpolation", interpol);
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154 // hint with border extender
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155 RenderingHints hint =
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156 new RenderingHints(
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157 JAI.KEY_BORDER_EXTENDER,
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158 BorderExtender.createInstance(BorderExtender.BORDER_COPY));
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159 // scale
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160 scaledImg = JAI.create("Scale", param, hint);
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161
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162 if (scaledImg == null) {
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163 throw new ImageOpException("Unable to scale");
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164 }
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165 img = scaledImg;
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166 }
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167
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168 public void blur(int radius) throws ImageOpException {
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169 RenderedImage blurredImg;
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170 //DEBUG
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171 logger.debug("blur: " + radius);
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172 int klen = Math.max(radius, 2);
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173 int ksize = klen * klen;
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174 float f = 1f / ksize;
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175 float[] kern = new float[ksize];
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176 for (int i = 0; i < ksize; i++) {
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177 kern[i] = f;
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178 }
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179 KernelJAI blur = new KernelJAI(klen, klen, kern);
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180 ParameterBlockJAI param = new ParameterBlockJAI("Convolve");
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181 param.addSource(img);
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182 param.setParameter("kernel", blur);
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183 // hint with border extender
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184 RenderingHints hint =
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185 new RenderingHints(
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186 JAI.KEY_BORDER_EXTENDER,
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187 BorderExtender.createInstance(BorderExtender.BORDER_COPY));
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188 blurredImg = JAI.create("Convolve", param, hint);
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189 if (blurredImg == null) {
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190 throw new ImageOpException("Unable to scale");
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191 }
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192 img = blurredImg;
142
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193 }
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194
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195 public void scaleBinary(float scale) throws ImageOpException {
142
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196 RenderedImage scaledImg;
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197 //DEBUG
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198 logger.debug("scaleBinary: " + scale);
142
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199 ParameterBlockJAI param =
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200 new ParameterBlockJAI("SubsampleBinaryToGray");
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201 param.addSource(img);
142
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202 param.setParameter("xScale", scale);
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203 param.setParameter("yScale", scale);
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204 // hint with border extender
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205 RenderingHints hint =
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206 new RenderingHints(
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207 JAI.KEY_BORDER_EXTENDER,
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208 BorderExtender.createInstance(BorderExtender.BORDER_COPY));
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209 // scale
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210 scaledImg = JAI.create("SubsampleBinaryToGray", param, hint);
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211 if (scaledImg == null) {
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212 throw new ImageOpException("Unable to scale");
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213 }
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214 img = scaledImg;
142
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215 }
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216
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217 /* crops the current image */
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218 public void crop(int x_off, int y_off, int width, int height)
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219 throws ImageOpException {
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220 // setup Crop
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221 ParameterBlock param = new ParameterBlock();
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222 param.addSource(img);
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223 param.add((float) x_off);
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224 param.add((float) y_off);
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225 param.add((float) width);
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226 param.add((float) height);
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227 RenderedImage croppedImg = JAI.create("crop", param);
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228
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229 logger.debug("CROP: "
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230 + x_off
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231 + ","
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232 + y_off
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233 + ", "
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234 + width
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235 + ","
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236 + height
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237 + " ->"
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238 + croppedImg.getWidth()
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239 + "x"
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240 + croppedImg.getHeight());
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241 //DEBUG
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242
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243 if (croppedImg == null) {
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244 throw new ImageOpException("Unable to crop");
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245 }
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246 img = croppedImg;
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247 }
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248
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249 /* rotates the current image */
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250 public void rotate(double angle) throws ImageOpException {
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251 RenderedImage rotImg;
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252 // convert degrees to radians
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253 double rangle = Math.toRadians(angle);
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254 double x = img.getWidth() / 2;
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255 double y = img.getHeight() / 2;
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256
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257 // optimize rotation by right angles
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258 TransposeType rotOp = null;
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259 if (Math.abs(angle - 0) < epsilon) {
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260 // 0 degree
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261 return;
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262 } else if (Math.abs(angle - 90) < epsilon) {
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263 // 90 degree
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264 rotOp = TransposeDescriptor.ROTATE_90;
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265 } else if (Math.abs(angle - 180) < epsilon) {
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266 // 180 degree
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267 rotOp = TransposeDescriptor.ROTATE_180;
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268 } else if (Math.abs(angle - 270) < epsilon) {
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269 // 270 degree
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270 rotOp = TransposeDescriptor.ROTATE_270;
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271 } else if (Math.abs(angle - 360) < epsilon) {
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272 // 360 degree
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273 return;
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274 }
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275 if (rotOp != null) {
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276 // use Transpose operation
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277 ParameterBlock pb = new ParameterBlock();
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278 pb.addSource(img);
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279 pb.add(rotOp);
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280 rotImg = JAI.create("transpose", pb);
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281 } else {
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282 // setup "normal" rotation
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283 ParameterBlock param = new ParameterBlock();
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284 param.addSource(img);
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285 param.add((float) x);
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286 param.add((float) y);
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287 param.add((float) rangle);
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288 param.add(interpol);
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289
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290 rotImg = JAI.create("rotate", param);
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291 }
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292
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293 logger.debug("ROTATE: "
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294 + x
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295 + ","
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296 + y
79
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297 + ", "
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298 + angle
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299 + " ("
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300 + rangle
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301 + ")"
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302 + " ->"
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303 + rotImg.getWidth()
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304 + "x"
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305 + rotImg.getHeight());
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306 //DEBUG
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307
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308 if (rotImg == null) {
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309 throw new ImageOpException("Unable to rotate");
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310 }
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311 img = rotImg;
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312 }
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313
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314 /* mirrors the current image
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315 * works only horizontal and vertical
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316 */
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317 public void mirror(double angle) throws ImageOpException {
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318 RenderedImage mirImg;
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319 // only mirroring by right angles
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320 TransposeType rotOp = null;
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321 if (Math.abs(angle) < epsilon) {
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322 // 0 degree
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323 rotOp = TransposeDescriptor.FLIP_HORIZONTAL;
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324 } else if (Math.abs(angle - 90) < epsilon) {
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325 // 90 degree
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326 rotOp = TransposeDescriptor.FLIP_VERTICAL;
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327 } else if (Math.abs(angle - 180) < epsilon) {
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328 // 180 degree
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329 rotOp = TransposeDescriptor.FLIP_HORIZONTAL;
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330 } else if (Math.abs(angle - 270) < epsilon) {
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331 // 270 degree
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332 rotOp = TransposeDescriptor.FLIP_VERTICAL;
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333 } else if (Math.abs(angle - 360) < epsilon) {
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334 // 360 degree
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335 rotOp = TransposeDescriptor.FLIP_HORIZONTAL;
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336 }
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337 // use Transpose operation
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338 ParameterBlock param = new ParameterBlock();
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339 param.addSource(img);
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340 param.add(rotOp);
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341 mirImg = JAI.create("transpose", param);
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342
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343 if (mirImg == null) {
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344 throw new ImageOpException("Unable to flip");
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345 }
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346 img = mirImg;
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347 }
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348
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349 /* contrast and brightness enhancement */
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350 public void enhance(float mult, float add) throws ImageOpException {
79
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351 RenderedImage enhImg;
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352 double[] ma = { mult };
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353 double[] aa = { add };
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354 // use Rescale operation
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355 ParameterBlock param = new ParameterBlock();
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356 param.addSource(img);
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357 param.add(ma);
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358 param.add(aa);
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359 enhImg = JAI.create("rescale", param);
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360
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361 logger.debug("ENHANCE: *"
79
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362 + mult
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363 + ", +"
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364 + add
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365 + " ->"
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366 + enhImg.getWidth()
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367 + "x"
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368 + enhImg.getHeight());
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369 //DEBUG
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370
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371 if (enhImg == null) {
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372 throw new ImageOpException("Unable to enhance");
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373 }
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374 img = enhImg;
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375 }
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376
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377 /* (non-Javadoc)
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378 * @see digilib.image.DocuImage#enhanceRGB(float[], float[])
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379 */
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380 public void enhanceRGB(float[] rgbm, float[] rgba)
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381 throws ImageOpException {
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382 RenderedImage enhImg;
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383 int nb = rgbm.length;
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384 double[] ma = new double[nb];
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385 double[] aa = new double[nb];
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386 for (int i = 0; i < nb; i++) {
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387 ma[i] = rgbm[i];
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388 aa[i] = rgba[i];
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389 }
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390 // use Rescale operation
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391 ParameterBlock param = new ParameterBlock();
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392 param.addSource(img);
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393 param.add(ma);
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394 param.add(aa);
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395 enhImg = JAI.create("rescale", param);
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396
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397 logger.debug("ENHANCE_RGB: *"
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398 + rgbm
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399 + ", +"
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400 + rgba
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401 + " ->"
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402 + enhImg.getWidth()
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403 + "x"
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404 + enhImg.getHeight());
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405 //DEBUG
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406
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407 if (enhImg == null) {
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408 throw new ImageOpException("Unable to enhanceRGB");
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409 }
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410 img = enhImg;
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411 }
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412
1
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413 }