Mercurial > hg > digilib-old
annotate servlet/src/digilib/image/JAIDocuImage.java @ 142:f52a7664a807
Servlet version 1.12b3
- JAIImageLoaderDocuImage working again
- smoother scaling with JAI and JAIImageLoader
- Quality default now 1
| author | robcast |
|---|---|
| date | Mon, 18 Aug 2003 11:38:15 +0200 |
| parents | 78f52a1876fe |
| children | d87a7e2515af |
| rev | line source |
|---|---|
| 1 | 1 /* JAIDocuImage -- Image class implementation using JAI (Java Advanced Imaging) |
| 2 | |
| 3 Digital Image Library servlet components | |
| 4 | |
| 85 | 5 Copyright (C) 2001, 2002, 2003 Robert Casties (robcast@mail.berlios.de) |
| 1 | 6 |
| 7 This program is free software; you can redistribute it and/or modify it | |
| 8 under the terms of the GNU General Public License as published by the | |
| 9 Free Software Foundation; either version 2 of the License, or (at your | |
| 10 option) any later version. | |
| 11 | |
| 12 Please read license.txt for the full details. A copy of the GPL | |
| 13 may be found at http://www.gnu.org/copyleft/lgpl.html | |
| 14 | |
| 15 You should have received a copy of the GNU General Public License | |
| 16 along with this program; if not, write to the Free Software | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 */ | |
| 20 | |
| 21 package digilib.image; | |
| 22 | |
|
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23 import java.awt.RenderingHints; |
| 73 | 24 import java.awt.image.RenderedImage; |
| 25 import java.awt.image.renderable.ParameterBlock; | |
| 26 import java.io.File; | |
| 27 import java.io.IOException; | |
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28 import java.io.OutputStream; |
| 1 | 29 |
| 142 | 30 import javax.media.jai.BorderExtender; |
| 31 import javax.media.jai.Interpolation; | |
| 32 import javax.media.jai.JAI; | |
| 33 import javax.media.jai.KernelJAI; | |
| 34 import javax.media.jai.ParameterBlockJAI; | |
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35 import javax.media.jai.operator.TransposeDescriptor; |
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36 import javax.media.jai.operator.TransposeType; |
| 1 | 37 |
| 73 | 38 import digilib.Utils; |
| 39 import digilib.io.FileOpException; | |
| 1 | 40 |
| 73 | 41 /** A DocuImage implementation using Java Advanced Imaging Library. */ |
| 1 | 42 public class JAIDocuImage extends DocuImageImpl { |
| 43 | |
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44 protected RenderedImage img; |
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45 protected Interpolation interpol = null; |
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46 |
| 73 | 47 /** Default constructor. */ |
| 48 public JAIDocuImage() { | |
| 49 } | |
| 1 | 50 |
| 90 | 51 /** Contructor taking an utils object. |
| 73 | 52 * @param u utils object. |
| 53 */ | |
| 54 public JAIDocuImage(Utils u) { | |
| 55 util = u; | |
| 56 } | |
| 1 | 57 |
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58 /* Load an image file into the Object. */ |
| 73 | 59 public void loadImage(File f) throws FileOpException { |
| 60 System.gc(); | |
| 61 img = JAI.create("fileload", f.getAbsolutePath()); | |
| 62 if (img == null) { | |
| 63 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
| 64 throw new FileOpException("Unable to load File!"); | |
| 65 } | |
| 66 } | |
| 1 | 67 |
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68 /* Write the current image to an OutputStream. */ |
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69 public void writeImage(String mt, OutputStream ostream) |
| 73 | 70 throws FileOpException { |
| 71 try { | |
| 72 // setup output | |
| 73 ParameterBlock pb3 = new ParameterBlock(); | |
| 74 pb3.addSource(img); | |
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75 pb3.add(ostream); |
| 73 | 76 if (mt == "image/jpeg") { |
| 77 pb3.add("JPEG"); | |
| 78 } else if (mt == "image/png") { | |
| 79 pb3.add("PNG"); | |
| 80 } else { | |
| 81 // unknown mime type | |
| 82 util.dprintln(2, "ERROR(writeImage): Unknown mime type " + mt); | |
| 83 throw new FileOpException("Unknown mime type: " + mt); | |
| 84 } | |
| 85 // render output | |
| 86 JAI.create("encode", pb3); | |
| 1 | 87 |
| 73 | 88 } catch (IOException e) { |
| 89 throw new FileOpException("Error writing image."); | |
| 90 } | |
| 91 } | |
| 1 | 92 |
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93 /* Real setQuality implementation. |
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94 * Creates the correct Interpolation. |
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95 */ |
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96 public void setQuality(int qual) { |
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97 quality = qual; |
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98 // setup interpolation quality |
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99 if (qual > 1) { |
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100 util.dprintln(4, "quality q2"); |
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101 interpol = Interpolation.getInstance(Interpolation.INTERP_BICUBIC); |
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102 } else if (qual == 1) { |
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103 util.dprintln(4, "quality q1"); |
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104 interpol = Interpolation.getInstance(Interpolation.INTERP_BILINEAR); |
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105 } else { |
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106 util.dprintln(4, "quality q0"); |
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107 interpol = Interpolation.getInstance(Interpolation.INTERP_NEAREST); |
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108 } |
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109 } |
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110 |
| 73 | 111 /** The width of the curent image in pixel. |
| 112 * @return Image width in pixels. | |
| 113 */ | |
| 114 public int getWidth() { | |
| 115 if (img != null) { | |
| 116 return img.getWidth(); | |
| 117 } | |
| 118 return 0; | |
| 119 } | |
| 1 | 120 |
| 73 | 121 /** The height of the curent image in pixel. |
| 122 * @return Image height in pixels. | |
| 123 */ | |
| 124 public int getHeight() { | |
| 125 if (img != null) { | |
| 126 return img.getHeight(); | |
| 127 } | |
| 128 return 0; | |
| 129 } | |
| 1 | 130 |
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131 /* scales the current image */ |
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132 public void scale(double scale) throws ImageOpException { |
| 142 | 133 RenderedImage scaledImg = null; |
| 134 if ((scale < 1) | |
| 135 && (img.getColorModel().getPixelSize() == 1) | |
| 136 && (quality > 0)) { | |
| 137 /* | |
| 138 * "SubsampleBinaryToGray" for downscaling BW | |
| 139 */ | |
| 140 scaledImg = scaleBinary((float) scale, img); | |
| 141 } else if ((scale <= 0.5) && (quality > 1)) { | |
| 142 /* | |
| 143 * blur and "Scale" for downscaling color images | |
| 144 */ | |
| 145 int subsample = (int) Math.floor(1 / scale); | |
| 146 RenderedImage prescaledImg = img; | |
| 147 prescaledImg = blur(subsample, img); | |
| 148 scaledImg = scaleAll((float) scale, prescaledImg); | |
| 149 } else { | |
| 150 /* | |
| 151 * "Scale" for the rest | |
| 152 */ | |
| 153 scaledImg = scaleAll((float) scale, img); | |
| 154 } | |
| 1 | 155 |
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156 //DEBUG |
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157 util.dprintln( |
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158 3, |
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159 "SCALE: " |
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160 + scale |
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161 + " ->" |
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162 + scaledImg.getWidth() |
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163 + "x" |
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164 + scaledImg.getHeight()); |
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165 |
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166 if (scaledImg == null) { |
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167 util.dprintln(2, "ERROR(scale): error in scale"); |
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168 throw new ImageOpException("Unable to scale"); |
| 73 | 169 } |
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170 img = scaledImg; |
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171 } |
| 1 | 172 |
| 142 | 173 private RenderedImage scaleAll(float scale, RenderedImage image) { |
| 174 RenderedImage scaledImg; | |
| 175 //DEBUG | |
| 176 util.dprintln(4, "scaleAll: " + scale); | |
| 177 ParameterBlockJAI param = new ParameterBlockJAI("Scale"); | |
| 178 param.addSource(image); | |
| 179 param.setParameter("xScale", scale); | |
| 180 param.setParameter("yScale", scale); | |
| 181 param.setParameter("interpolation", interpol); | |
| 182 // hint with border extender | |
| 183 RenderingHints hint = | |
| 184 new RenderingHints( | |
| 185 JAI.KEY_BORDER_EXTENDER, | |
| 186 BorderExtender.createInstance(BorderExtender.BORDER_COPY)); | |
| 187 // scale | |
| 188 scaledImg = JAI.create("Scale", param, hint); | |
| 189 return scaledImg; | |
| 190 } | |
| 191 | |
| 192 private RenderedImage blur(int radius, RenderedImage image) { | |
| 193 RenderedImage blurredImg; | |
| 194 //DEBUG | |
| 195 util.dprintln(4, "blur: " + radius); | |
| 196 int klen = Math.max(radius, 2); | |
| 197 int ksize = klen * klen; | |
| 198 float f = 1f / ksize; | |
| 199 float[] kern = new float[ksize]; | |
| 200 for (int i = 0; i < ksize; i++) { | |
| 201 kern[i] = f; | |
| 202 } | |
| 203 KernelJAI blur = new KernelJAI(klen, klen, kern); | |
| 204 ParameterBlockJAI param = new ParameterBlockJAI("Convolve"); | |
| 205 param.addSource(image); | |
| 206 param.setParameter("kernel", blur); | |
| 207 // hint with border extender | |
| 208 RenderingHints hint = | |
| 209 new RenderingHints( | |
| 210 JAI.KEY_BORDER_EXTENDER, | |
| 211 BorderExtender.createInstance(BorderExtender.BORDER_COPY)); | |
| 212 blurredImg = JAI.create("Convolve", param, hint); | |
| 213 return blurredImg; | |
| 214 } | |
| 215 | |
| 216 RenderedImage scaleBinary(float scale, RenderedImage image) { | |
| 217 RenderedImage scaledImg; | |
| 218 //DEBUG | |
| 219 util.dprintln(4, "scaleBinary: " + scale); | |
| 220 ParameterBlockJAI param = | |
| 221 new ParameterBlockJAI("SubsampleBinaryToGray"); | |
| 222 param.addSource(image); | |
| 223 param.setParameter("xScale", scale); | |
| 224 param.setParameter("yScale", scale); | |
| 225 // hint with border extender | |
| 226 RenderingHints hint = | |
| 227 new RenderingHints( | |
| 228 JAI.KEY_BORDER_EXTENDER, | |
| 229 BorderExtender.createInstance(BorderExtender.BORDER_COPY)); | |
| 230 // scale | |
| 231 scaledImg = JAI.create("SubsampleBinaryToGray", param, hint); | |
| 232 return scaledImg; | |
| 233 } | |
| 234 | |
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235 /* crops the current image */ |
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236 public void crop(int x_off, int y_off, int width, int height) |
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237 throws ImageOpException { |
| 73 | 238 // setup Crop |
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239 ParameterBlock param = new ParameterBlock(); |
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240 param.addSource(img); |
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241 param.add((float) x_off); |
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242 param.add((float) y_off); |
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243 param.add((float) width); |
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244 param.add((float) height); |
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245 RenderedImage croppedImg = JAI.create("crop", param); |
| 1 | 246 |
| 73 | 247 util.dprintln( |
| 248 3, | |
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249 "CROP: " |
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250 + x_off |
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251 + "," |
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252 + y_off |
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253 + ", " |
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254 + width |
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255 + "," |
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256 + height |
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257 + " ->" |
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258 + croppedImg.getWidth() |
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259 + "x" |
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260 + croppedImg.getHeight()); |
| 73 | 261 //DEBUG |
| 262 | |
| 263 if (croppedImg == null) { | |
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264 util.dprintln(2, "ERROR(crop): error in crop"); |
| 73 | 265 throw new ImageOpException("Unable to crop"); |
| 266 } | |
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267 img = croppedImg; |
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268 } |
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269 |
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270 /* rotates the current image */ |
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271 public void rotate(double angle) throws ImageOpException { |
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272 RenderedImage rotImg; |
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273 // convert degrees to radians |
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274 double rangle = Math.toRadians(angle); |
| 101 | 275 double x = img.getWidth() / 2; |
| 276 double y = img.getHeight() / 2; | |
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277 |
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278 // optimize rotation by right angles |
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279 TransposeType rotOp = null; |
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280 if (Math.abs(angle - 0) < epsilon) { |
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281 // 0 degree |
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282 return; |
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283 } else if (Math.abs(angle - 90) < epsilon) { |
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284 // 90 degree |
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285 rotOp = TransposeDescriptor.ROTATE_90; |
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286 } else if (Math.abs(angle - 180) < epsilon) { |
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287 // 180 degree |
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288 rotOp = TransposeDescriptor.ROTATE_180; |
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289 } else if (Math.abs(angle - 270) < epsilon) { |
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290 // 270 degree |
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291 rotOp = TransposeDescriptor.ROTATE_270; |
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292 } else if (Math.abs(angle - 360) < epsilon) { |
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293 // 360 degree |
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294 return; |
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295 } |
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296 if (rotOp != null) { |
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297 // use Transpose operation |
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298 ParameterBlock pb = new ParameterBlock(); |
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299 pb.addSource(img); |
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300 pb.add(rotOp); |
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301 rotImg = JAI.create("transpose", pb); |
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302 } else { |
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303 // setup "normal" rotation |
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304 ParameterBlock param = new ParameterBlock(); |
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305 param.addSource(img); |
| 101 | 306 param.add((float) x); |
| 307 param.add((float) y); | |
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308 param.add((float) rangle); |
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309 param.add(interpol); |
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310 |
| 101 | 311 rotImg = JAI.create("rotate", param); |
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312 } |
| 73 | 313 |
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314 util.dprintln( |
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315 3, |
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316 "ROTATE: " |
| 85 | 317 + x |
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318 + "," |
| 85 | 319 + y |
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320 + ", " |
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321 + angle |
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322 + " (" |
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323 + rangle |
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324 + ")" |
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325 + " ->" |
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326 + rotImg.getWidth() |
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327 + "x" |
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328 + rotImg.getHeight()); |
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329 //DEBUG |
| 1 | 330 |
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331 if (rotImg == null) { |
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332 util.dprintln(2, "ERROR: error in rotate"); |
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333 throw new ImageOpException("Unable to rotate"); |
| 73 | 334 } |
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335 img = rotImg; |
| 73 | 336 } |
| 1 | 337 |
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338 /* mirrors the current image |
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339 * works only horizontal and vertical |
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340 */ |
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341 public void mirror(double angle) throws ImageOpException { |
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342 RenderedImage mirImg; |
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343 // only mirroring by right angles |
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344 TransposeType rotOp = null; |
| 101 | 345 if (Math.abs(angle) < epsilon) { |
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346 // 0 degree |
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347 rotOp = TransposeDescriptor.FLIP_HORIZONTAL; |
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348 } else if (Math.abs(angle - 90) < epsilon) { |
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349 // 90 degree |
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350 rotOp = TransposeDescriptor.FLIP_VERTICAL; |
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351 } else if (Math.abs(angle - 180) < epsilon) { |
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352 // 180 degree |
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353 rotOp = TransposeDescriptor.FLIP_HORIZONTAL; |
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354 } else if (Math.abs(angle - 270) < epsilon) { |
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355 // 270 degree |
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356 rotOp = TransposeDescriptor.FLIP_VERTICAL; |
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357 } else if (Math.abs(angle - 360) < epsilon) { |
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358 // 360 degree |
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359 rotOp = TransposeDescriptor.FLIP_HORIZONTAL; |
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360 } |
| 101 | 361 // use Transpose operation |
| 362 ParameterBlock param = new ParameterBlock(); | |
| 363 param.addSource(img); | |
| 364 param.add(rotOp); | |
| 365 mirImg = JAI.create("transpose", param); | |
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366 |
| 101 | 367 if (mirImg == null) { |
| 368 util.dprintln(2, "ERROR(mirror): error in flip"); | |
| 369 throw new ImageOpException("Unable to flip"); | |
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370 } |
| 101 | 371 img = mirImg; |
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372 } |
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373 |
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374 /* contrast and brightness enhancement */ |
| 86 | 375 public void enhance(float mult, float add) throws ImageOpException { |
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376 RenderedImage enhImg; |
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377 double[] ma = { mult }; |
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378 double[] aa = { add }; |
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379 // use Rescale operation |
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380 ParameterBlock param = new ParameterBlock(); |
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381 param.addSource(img); |
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382 param.add(ma); |
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383 param.add(aa); |
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384 enhImg = JAI.create("rescale", param); |
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385 |
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386 util.dprintln( |
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387 3, |
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388 "ENHANCE: *" |
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389 + mult |
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390 + ", +" |
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391 + add |
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392 + " ->" |
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393 + enhImg.getWidth() |
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394 + "x" |
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395 + enhImg.getHeight()); |
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396 //DEBUG |
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397 |
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398 if (enhImg == null) { |
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399 util.dprintln(2, "ERROR(enhance): error in enhance"); |
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400 throw new ImageOpException("Unable to enhance"); |
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401 } |
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402 img = enhImg; |
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403 } |
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404 |
| 90 | 405 /* (non-Javadoc) |
| 406 * @see digilib.image.DocuImage#enhanceRGB(float[], float[]) | |
| 407 */ | |
| 408 public void enhanceRGB(float[] rgbm, float[] rgba) | |
| 409 throws ImageOpException { | |
| 101 | 410 RenderedImage enhImg; |
| 411 int nb = rgbm.length; | |
| 412 double[] ma = new double[nb]; | |
| 413 double[] aa = new double[nb]; | |
| 414 for (int i = 0; i < nb; i++) { | |
| 415 ma[i] = rgbm[i]; | |
| 416 aa[i] = rgba[i]; | |
| 417 } | |
| 418 // use Rescale operation | |
| 419 ParameterBlock param = new ParameterBlock(); | |
| 420 param.addSource(img); | |
| 421 param.add(ma); | |
| 422 param.add(aa); | |
| 423 enhImg = JAI.create("rescale", param); | |
| 90 | 424 |
| 101 | 425 util.dprintln( |
| 426 3, | |
| 427 "ENHANCE_RGB: *" | |
| 428 + rgbm | |
| 429 + ", +" | |
| 430 + rgba | |
| 431 + " ->" | |
| 432 + enhImg.getWidth() | |
| 433 + "x" | |
| 434 + enhImg.getHeight()); | |
| 435 //DEBUG | |
| 90 | 436 |
| 101 | 437 if (enhImg == null) { |
| 438 util.dprintln(2, "ERROR(enhance): error in enhanceRGB"); | |
| 439 throw new ImageOpException("Unable to enhanceRGB"); | |
| 440 } | |
| 441 img = enhImg; | |
| 90 | 442 } |
| 443 | |
| 1 | 444 } |