Mercurial > hg > digilib-old
annotate servlet/src/digilib/image/JAIDocuImage.java @ 176:67ff8c7fecb9
Servlet version 1.17b2
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| author | robcast |
|---|---|
| date | Mon, 10 Nov 2003 20:59:00 +0100 |
| parents | e743b853efca |
| children | afe7ff98bb71 |
| 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.IOException; | |
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27 import java.io.OutputStream; |
| 1 | 28 |
| 142 | 29 import javax.media.jai.BorderExtender; |
| 30 import javax.media.jai.Interpolation; | |
| 31 import javax.media.jai.JAI; | |
| 32 import javax.media.jai.KernelJAI; | |
| 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; |
| 1 | 36 |
| 73 | 37 import digilib.Utils; |
| 159 | 38 import digilib.io.ImageFile; |
| 73 | 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. */ |
| 159 | 59 public void loadImage(ImageFile f) throws FileOpException { |
| 73 | 60 System.gc(); |
| 149 | 61 img = JAI.create("fileload", f.getFile().getAbsolutePath()); |
| 73 | 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 */ |
| 149 | 132 public void scale(double scale, double scaleY) throws ImageOpException { |
| 142 | 133 if ((scale < 1) |
| 134 && (img.getColorModel().getPixelSize() == 1) | |
| 135 && (quality > 0)) { | |
| 136 /* | |
| 137 * "SubsampleBinaryToGray" for downscaling BW | |
| 138 */ | |
| 144 | 139 scaleBinary((float) scale); |
| 142 | 140 } else if ((scale <= 0.5) && (quality > 1)) { |
| 141 /* | |
| 142 * blur and "Scale" for downscaling color images | |
| 143 */ | |
| 144 int subsample = (int) Math.floor(1 / scale); | |
| 144 | 145 blur(subsample); |
| 146 scaleAll((float) scale); | |
| 142 | 147 } else { |
| 148 /* | |
| 149 * "Scale" for the rest | |
| 150 */ | |
| 144 | 151 scaleAll((float) scale); |
| 142 | 152 } |
| 1 | 153 |
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154 //DEBUG |
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155 util.dprintln( |
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156 3, |
| 144 | 157 "SCALE: " + scale + " ->" + img.getWidth() + "x" + img.getHeight()); |
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158 |
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159 } |
| 1 | 160 |
| 144 | 161 public void scaleAll(float scale) throws ImageOpException { |
| 142 | 162 RenderedImage scaledImg; |
| 163 //DEBUG | |
| 164 util.dprintln(4, "scaleAll: " + scale); | |
| 165 ParameterBlockJAI param = new ParameterBlockJAI("Scale"); | |
| 144 | 166 param.addSource(img); |
| 142 | 167 param.setParameter("xScale", scale); |
| 168 param.setParameter("yScale", scale); | |
| 169 param.setParameter("interpolation", interpol); | |
| 170 // hint with border extender | |
| 171 RenderingHints hint = | |
| 172 new RenderingHints( | |
| 173 JAI.KEY_BORDER_EXTENDER, | |
| 174 BorderExtender.createInstance(BorderExtender.BORDER_COPY)); | |
| 175 // scale | |
| 176 scaledImg = JAI.create("Scale", param, hint); | |
| 144 | 177 |
| 178 if (scaledImg == null) { | |
| 179 util.dprintln(2, "ERROR(scale): error in scale"); | |
| 180 throw new ImageOpException("Unable to scale"); | |
| 181 } | |
| 182 img = scaledImg; | |
| 142 | 183 } |
| 184 | |
| 144 | 185 public void blur(int radius) throws ImageOpException { |
| 142 | 186 RenderedImage blurredImg; |
| 187 //DEBUG | |
| 188 util.dprintln(4, "blur: " + radius); | |
| 189 int klen = Math.max(radius, 2); | |
| 190 int ksize = klen * klen; | |
| 191 float f = 1f / ksize; | |
| 192 float[] kern = new float[ksize]; | |
| 193 for (int i = 0; i < ksize; i++) { | |
| 194 kern[i] = f; | |
| 195 } | |
| 196 KernelJAI blur = new KernelJAI(klen, klen, kern); | |
| 197 ParameterBlockJAI param = new ParameterBlockJAI("Convolve"); | |
| 144 | 198 param.addSource(img); |
| 142 | 199 param.setParameter("kernel", blur); |
| 200 // hint with border extender | |
| 201 RenderingHints hint = | |
| 202 new RenderingHints( | |
| 203 JAI.KEY_BORDER_EXTENDER, | |
| 204 BorderExtender.createInstance(BorderExtender.BORDER_COPY)); | |
| 205 blurredImg = JAI.create("Convolve", param, hint); | |
| 144 | 206 if (blurredImg == null) { |
| 207 util.dprintln(2, "ERROR(scale): error in scale"); | |
| 208 throw new ImageOpException("Unable to scale"); | |
| 209 } | |
| 210 img = blurredImg; | |
| 142 | 211 } |
| 212 | |
| 144 | 213 public void scaleBinary(float scale) throws ImageOpException { |
| 142 | 214 RenderedImage scaledImg; |
| 215 //DEBUG | |
| 216 util.dprintln(4, "scaleBinary: " + scale); | |
| 217 ParameterBlockJAI param = | |
| 218 new ParameterBlockJAI("SubsampleBinaryToGray"); | |
| 144 | 219 param.addSource(img); |
| 142 | 220 param.setParameter("xScale", scale); |
| 221 param.setParameter("yScale", scale); | |
| 222 // hint with border extender | |
| 223 RenderingHints hint = | |
| 224 new RenderingHints( | |
| 225 JAI.KEY_BORDER_EXTENDER, | |
| 226 BorderExtender.createInstance(BorderExtender.BORDER_COPY)); | |
| 227 // scale | |
| 228 scaledImg = JAI.create("SubsampleBinaryToGray", param, hint); | |
| 144 | 229 if (scaledImg == null) { |
| 230 util.dprintln(2, "ERROR(scale): error in scale"); | |
| 231 throw new ImageOpException("Unable to scale"); | |
| 232 } | |
| 233 img = scaledImg; | |
| 142 | 234 } |
| 235 | |
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236 /* crops the current image */ |
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237 public void crop(int x_off, int y_off, int width, int height) |
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238 throws ImageOpException { |
| 73 | 239 // setup Crop |
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240 ParameterBlock param = new ParameterBlock(); |
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241 param.addSource(img); |
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242 param.add((float) x_off); |
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243 param.add((float) y_off); |
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244 param.add((float) width); |
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245 param.add((float) height); |
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246 RenderedImage croppedImg = JAI.create("crop", param); |
| 1 | 247 |
| 73 | 248 util.dprintln( |
| 249 3, | |
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250 "CROP: " |
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251 + x_off |
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252 + "," |
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253 + y_off |
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254 + ", " |
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255 + width |
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256 + "," |
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257 + height |
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258 + " ->" |
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259 + croppedImg.getWidth() |
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260 + "x" |
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261 + croppedImg.getHeight()); |
| 73 | 262 //DEBUG |
| 263 | |
| 264 if (croppedImg == null) { | |
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265 util.dprintln(2, "ERROR(crop): error in crop"); |
| 73 | 266 throw new ImageOpException("Unable to crop"); |
| 267 } | |
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268 img = croppedImg; |
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269 } |
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270 |
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271 /* rotates the current image */ |
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272 public void rotate(double angle) throws ImageOpException { |
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273 RenderedImage rotImg; |
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274 // convert degrees to radians |
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275 double rangle = Math.toRadians(angle); |
| 101 | 276 double x = img.getWidth() / 2; |
| 277 double y = img.getHeight() / 2; | |
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278 |
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279 // optimize rotation by right angles |
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280 TransposeType rotOp = null; |
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281 if (Math.abs(angle - 0) < epsilon) { |
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282 // 0 degree |
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283 return; |
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284 } else if (Math.abs(angle - 90) < epsilon) { |
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285 // 90 degree |
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286 rotOp = TransposeDescriptor.ROTATE_90; |
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287 } else if (Math.abs(angle - 180) < epsilon) { |
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288 // 180 degree |
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289 rotOp = TransposeDescriptor.ROTATE_180; |
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290 } else if (Math.abs(angle - 270) < epsilon) { |
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291 // 270 degree |
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292 rotOp = TransposeDescriptor.ROTATE_270; |
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293 } else if (Math.abs(angle - 360) < epsilon) { |
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294 // 360 degree |
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295 return; |
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296 } |
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297 if (rotOp != null) { |
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298 // use Transpose operation |
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299 ParameterBlock pb = new ParameterBlock(); |
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300 pb.addSource(img); |
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301 pb.add(rotOp); |
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302 rotImg = JAI.create("transpose", pb); |
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303 } else { |
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304 // setup "normal" rotation |
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305 ParameterBlock param = new ParameterBlock(); |
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306 param.addSource(img); |
| 101 | 307 param.add((float) x); |
| 308 param.add((float) y); | |
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309 param.add((float) rangle); |
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310 param.add(interpol); |
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311 |
| 101 | 312 rotImg = JAI.create("rotate", param); |
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313 } |
| 73 | 314 |
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315 util.dprintln( |
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316 3, |
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317 "ROTATE: " |
| 85 | 318 + x |
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319 + "," |
| 85 | 320 + y |
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321 + ", " |
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322 + angle |
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323 + " (" |
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324 + rangle |
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325 + ")" |
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326 + " ->" |
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327 + rotImg.getWidth() |
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328 + "x" |
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329 + rotImg.getHeight()); |
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330 //DEBUG |
| 1 | 331 |
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332 if (rotImg == null) { |
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333 util.dprintln(2, "ERROR: error in rotate"); |
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334 throw new ImageOpException("Unable to rotate"); |
| 73 | 335 } |
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336 img = rotImg; |
| 73 | 337 } |
| 1 | 338 |
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339 /* mirrors the current image |
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340 * works only horizontal and vertical |
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341 */ |
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342 public void mirror(double angle) throws ImageOpException { |
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343 RenderedImage mirImg; |
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344 // only mirroring by right angles |
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345 TransposeType rotOp = null; |
| 101 | 346 if (Math.abs(angle) < epsilon) { |
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347 // 0 degree |
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348 rotOp = TransposeDescriptor.FLIP_HORIZONTAL; |
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349 } else if (Math.abs(angle - 90) < epsilon) { |
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350 // 90 degree |
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351 rotOp = TransposeDescriptor.FLIP_VERTICAL; |
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352 } else if (Math.abs(angle - 180) < epsilon) { |
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353 // 180 degree |
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354 rotOp = TransposeDescriptor.FLIP_HORIZONTAL; |
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355 } else if (Math.abs(angle - 270) < epsilon) { |
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356 // 270 degree |
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357 rotOp = TransposeDescriptor.FLIP_VERTICAL; |
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358 } else if (Math.abs(angle - 360) < epsilon) { |
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359 // 360 degree |
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360 rotOp = TransposeDescriptor.FLIP_HORIZONTAL; |
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361 } |
| 101 | 362 // use Transpose operation |
| 363 ParameterBlock param = new ParameterBlock(); | |
| 364 param.addSource(img); | |
| 365 param.add(rotOp); | |
| 366 mirImg = JAI.create("transpose", param); | |
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367 |
| 101 | 368 if (mirImg == null) { |
| 369 util.dprintln(2, "ERROR(mirror): error in flip"); | |
| 370 throw new ImageOpException("Unable to flip"); | |
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371 } |
| 101 | 372 img = mirImg; |
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373 } |
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374 |
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375 /* contrast and brightness enhancement */ |
| 86 | 376 public void enhance(float mult, float add) throws ImageOpException { |
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377 RenderedImage enhImg; |
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378 double[] ma = { mult }; |
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379 double[] aa = { add }; |
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380 // use Rescale operation |
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381 ParameterBlock param = new ParameterBlock(); |
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382 param.addSource(img); |
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383 param.add(ma); |
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384 param.add(aa); |
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385 enhImg = JAI.create("rescale", param); |
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386 |
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387 util.dprintln( |
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388 3, |
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389 "ENHANCE: *" |
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390 + mult |
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391 + ", +" |
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392 + add |
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393 + " ->" |
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394 + enhImg.getWidth() |
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395 + "x" |
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396 + enhImg.getHeight()); |
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397 //DEBUG |
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398 |
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399 if (enhImg == null) { |
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400 util.dprintln(2, "ERROR(enhance): error in enhance"); |
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401 throw new ImageOpException("Unable to enhance"); |
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402 } |
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403 img = enhImg; |
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404 } |
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405 |
| 90 | 406 /* (non-Javadoc) |
| 407 * @see digilib.image.DocuImage#enhanceRGB(float[], float[]) | |
| 408 */ | |
| 409 public void enhanceRGB(float[] rgbm, float[] rgba) | |
| 410 throws ImageOpException { | |
| 101 | 411 RenderedImage enhImg; |
| 412 int nb = rgbm.length; | |
| 413 double[] ma = new double[nb]; | |
| 414 double[] aa = new double[nb]; | |
| 415 for (int i = 0; i < nb; i++) { | |
| 416 ma[i] = rgbm[i]; | |
| 417 aa[i] = rgba[i]; | |
| 418 } | |
| 419 // use Rescale operation | |
| 420 ParameterBlock param = new ParameterBlock(); | |
| 421 param.addSource(img); | |
| 422 param.add(ma); | |
| 423 param.add(aa); | |
| 424 enhImg = JAI.create("rescale", param); | |
| 90 | 425 |
| 101 | 426 util.dprintln( |
| 427 3, | |
| 428 "ENHANCE_RGB: *" | |
| 429 + rgbm | |
| 430 + ", +" | |
| 431 + rgba | |
| 432 + " ->" | |
| 433 + enhImg.getWidth() | |
| 434 + "x" | |
| 435 + enhImg.getHeight()); | |
| 436 //DEBUG | |
| 90 | 437 |
| 101 | 438 if (enhImg == null) { |
| 439 util.dprintln(2, "ERROR(enhance): error in enhanceRGB"); | |
| 440 throw new ImageOpException("Unable to enhanceRGB"); | |
| 441 } | |
| 442 img = enhImg; | |
| 90 | 443 } |
| 444 | |
| 1 | 445 } |