Mercurial > hg > digilib-old
annotate servlet/src/digilib/image/ImageWorker.java @ 568:34701340922e stream
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author | robcast |
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date | Tue, 21 Dec 2010 12:16:33 +0100 |
parents | 8beefd1142b2 |
children | fd2ef7e46119 |
rev | line source |
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1 /** Worker (Callable) that renders an image. |
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2 * |
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3 */ |
557 | 4 package digilib.image; |
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5 |
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6 import java.awt.Rectangle; |
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7 import java.io.IOException; |
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8 import java.util.concurrent.Callable; |
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9 |
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10 import org.apache.log4j.Logger; |
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11 |
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12 import digilib.io.FileOpException; |
557 | 13 import digilib.servlet.DigilibConfiguration; |
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14 |
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15 /** Worker that renders an image. |
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16 * |
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17 * @author casties |
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18 * |
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19 */ |
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20 public class ImageWorker implements Callable<DocuImage> { |
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21 |
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22 |
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23 protected static Logger logger = Logger.getLogger(ImageWorker.class); |
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24 private DigilibConfiguration dlConfig; |
547 | 25 private ImageJobDescription jobinfo; |
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26 |
547 | 27 public ImageWorker(DigilibConfiguration dlConfig, ImageJobDescription jobinfo) { |
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28 super(); |
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29 this.dlConfig = dlConfig; |
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30 this.jobinfo = jobinfo; |
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31 } |
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32 |
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33 /** |
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34 * render and return the image |
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35 */ |
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36 @Override |
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37 public DocuImage call() throws FileOpException, IOException, ImageOpException { |
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38 |
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39 logger.debug("image worker starting"); |
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40 long startTime = System.currentTimeMillis(); |
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41 |
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42 /* crop and scale image */ |
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43 |
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44 // new DocuImage instance |
564 | 45 DocuImage docuImage = DigilibConfiguration.getDocuImageInstance(); |
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46 if (docuImage == null) { |
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47 throw new ImageOpException("Unable to load DocuImage class!"); |
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48 } |
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49 |
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50 // set interpolation quality |
565 | 51 docuImage.setQuality(jobinfo.getScaleQual()); |
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52 |
547 | 53 Rectangle loadRect = jobinfo.getOuterUserImgArea().getBounds(); |
54 float scaleXY = jobinfo.getScaleXY(); | |
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55 |
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56 // use subimage loading if possible |
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57 if (docuImage.isSubimageSupported()) { |
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58 logger.debug("Subimage: scale " + scaleXY + " = " + (1 / scaleXY)); |
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59 float subf = 1f; |
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60 float subsamp = 1f; |
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61 if (scaleXY < 1) { |
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62 subf = 1 / scaleXY; |
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63 // for higher quality reduce subsample factor by minSubsample |
565 | 64 if (jobinfo.getScaleQual() > 0) { |
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65 subsamp = (float) Math.max(Math.floor(subf / dlConfig.getAsFloat("subsample-minimum")), 1d); |
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66 } else { |
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67 subsamp = (float) Math.floor(subf); |
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68 } |
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69 scaleXY = subsamp / subf; |
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70 logger.debug("Using subsampling: " + subsamp + " rest " |
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71 + scaleXY); |
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72 } |
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73 |
547 | 74 docuImage.loadSubimage(jobinfo.getFileToLoad(), loadRect, (int) subsamp); |
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75 |
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76 logger.debug("SUBSAMP: " + subsamp + " -> " + docuImage.getWidth() |
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77 + "x" + docuImage.getHeight()); |
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78 |
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79 docuImage.scale(scaleXY, scaleXY); |
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80 |
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81 } else { |
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82 // else load and crop the whole file |
547 | 83 docuImage.loadImage(jobinfo.getFileToLoad()); |
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84 docuImage.crop((int) loadRect.getX(), (int) loadRect.getY(), |
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85 (int) loadRect.getWidth(), (int) loadRect.getHeight()); |
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86 |
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87 docuImage.scale(scaleXY, scaleXY); |
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88 } |
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89 |
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90 // mirror image |
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91 // operation mode: "hmir": mirror horizontally, "vmir": mirror |
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92 // vertically |
547 | 93 if (jobinfo.hasOption("hmir")) { |
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94 docuImage.mirror(0); |
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95 } |
547 | 96 if (jobinfo.hasOption("vmir")) { |
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97 docuImage.mirror(90); |
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98 } |
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99 |
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100 // rotate image |
547 | 101 if (jobinfo.getAsFloat("rot") != 0d) { |
102 docuImage.rotate(jobinfo.getAsFloat("rot")); | |
103 /* if (jobinfo.get_wholeRotArea()) { | |
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104 // crop to the inner bounding box |
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105 float xcrop = (float) (docuImage.getWidth() - jobinfo.get_innerUserImgArea().getWidth() |
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106 * scaleXY); |
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107 float ycrop = (float) (docuImage.getHeight() - jobinfo.get_innerUserImgArea().getHeight() |
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108 * scaleXY); |
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109 if ((xcrop > 0) || (ycrop > 0)) { |
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110 // only crop smaller |
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111 xcrop = (xcrop > 0) ? xcrop : 0; |
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112 ycrop = (ycrop > 0) ? ycrop : 0; |
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113 // crop image |
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114 docuImage.crop((int) (xcrop / 2), (int) (ycrop / 2), |
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115 (int) (docuImage.getWidth() - xcrop), |
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116 (int) (docuImage.getHeight() - ycrop)); |
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117 } |
547 | 118 } */ |
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119 |
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120 } |
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121 |
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122 // color modification |
547 | 123 float[] paramRGBM = jobinfo.getRGBM(); |
124 float[] paramRGBA = jobinfo.getRGBA(); | |
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125 if ((paramRGBM != null) || (paramRGBA != null)) { |
547 | 126 // make sure we actually have two arrays |
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127 if (paramRGBM == null) { |
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128 paramRGBM = new float[3]; |
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129 } |
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130 if (paramRGBA == null) { |
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131 paramRGBA = new float[3]; |
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132 } |
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133 // calculate "contrast" values (c=2^x) |
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134 float[] mult = new float[3]; |
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135 for (int i = 0; i < 3; i++) { |
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136 mult[i] = (float) Math.pow(2, (float) paramRGBM[i]); |
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137 } |
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138 docuImage.enhanceRGB(mult, paramRGBA); |
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139 } |
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140 |
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141 // contrast and brightness enhancement |
547 | 142 float paramCONT = jobinfo.getAsFloat("cont"); |
143 float paramBRGT = jobinfo.getAsFloat("brgt"); | |
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144 if ((paramCONT != 0f) || (paramBRGT != 0f)) { |
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145 float mult = (float) Math.pow(2, paramCONT); |
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146 docuImage.enhance(mult, paramBRGT); |
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147 } |
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148 |
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149 logger.debug("rendered in " + (System.currentTimeMillis() - startTime) + "ms"); |
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150 |
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151 return docuImage; |
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152 } |
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153 |
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154 } |