Mercurial > hg > digilib-old
annotate servlet/src/digilib/image/JAIDocuImage.java @ 87:5d44cd2481a5
New version 1.8b4.
Utils without static debuglevel.
author | robcast |
---|---|
date | Mon, 17 Mar 2003 15:23:17 +0100 |
parents | 997ba69afb81 |
children | 8058d3b3466a |
rev | line source |
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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 |
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30 import javax.media.jai.*; |
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31 import javax.media.jai.operator.TransposeDescriptor; |
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32 import javax.media.jai.operator.TransposeType; |
1 | 33 |
73 | 34 import digilib.Utils; |
35 import digilib.io.FileOpException; | |
1 | 36 |
73 | 37 /** A DocuImage implementation using Java Advanced Imaging Library. */ |
1 | 38 public class JAIDocuImage extends DocuImageImpl { |
39 | |
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40 protected RenderedImage img; |
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41 protected Interpolation interpol = null; |
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42 |
73 | 43 /** Default constructor. */ |
44 public JAIDocuImage() { | |
45 } | |
1 | 46 |
73 | 47 /** Contructor taking a utils object. |
48 * @param u utils object. | |
49 */ | |
50 public JAIDocuImage(Utils u) { | |
51 util = u; | |
52 } | |
1 | 53 |
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54 /* Load an image file into the Object. */ |
73 | 55 public void loadImage(File f) throws FileOpException { |
56 System.gc(); | |
57 img = JAI.create("fileload", f.getAbsolutePath()); | |
58 if (img == null) { | |
59 util.dprintln(3, "ERROR(loadImage): unable to load file"); | |
60 throw new FileOpException("Unable to load File!"); | |
61 } | |
62 } | |
1 | 63 |
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64 /* Write the current image to an OutputStream. */ |
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65 public void writeImage(String mt, OutputStream ostream) |
73 | 66 throws FileOpException { |
67 try { | |
68 // setup output | |
69 ParameterBlock pb3 = new ParameterBlock(); | |
70 pb3.addSource(img); | |
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71 pb3.add(ostream); |
73 | 72 if (mt == "image/jpeg") { |
73 pb3.add("JPEG"); | |
74 } else if (mt == "image/png") { | |
75 pb3.add("PNG"); | |
76 } else { | |
77 // unknown mime type | |
78 util.dprintln(2, "ERROR(writeImage): Unknown mime type " + mt); | |
79 throw new FileOpException("Unknown mime type: " + mt); | |
80 } | |
81 // render output | |
82 JAI.create("encode", pb3); | |
1 | 83 |
73 | 84 } catch (IOException e) { |
85 throw new FileOpException("Error writing image."); | |
86 } | |
87 } | |
1 | 88 |
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89 /* Real setQuality implementation. |
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90 * Creates the correct Interpolation. |
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91 */ |
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92 public void setQuality(int qual) { |
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93 quality = qual; |
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94 // setup interpolation quality |
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95 if (qual > 1) { |
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96 util.dprintln(4, "quality q2"); |
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97 interpol = Interpolation.getInstance(Interpolation.INTERP_BICUBIC); |
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98 } else if (qual == 1) { |
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99 util.dprintln(4, "quality q1"); |
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100 interpol = Interpolation.getInstance(Interpolation.INTERP_BILINEAR); |
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101 } else { |
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102 util.dprintln(4, "quality q0"); |
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103 interpol = Interpolation.getInstance(Interpolation.INTERP_NEAREST); |
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104 } |
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105 } |
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106 |
73 | 107 /** The width of the curent image in pixel. |
108 * @return Image width in pixels. | |
109 */ | |
110 public int getWidth() { | |
111 if (img != null) { | |
112 return img.getWidth(); | |
113 } | |
114 return 0; | |
115 } | |
1 | 116 |
73 | 117 /** The height of the curent image in pixel. |
118 * @return Image height in pixels. | |
119 */ | |
120 public int getHeight() { | |
121 if (img != null) { | |
122 return img.getHeight(); | |
123 } | |
124 return 0; | |
125 } | |
1 | 126 |
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127 /* scales the current image */ |
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128 public void scale(double scale) throws ImageOpException { |
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129 float sf = (float)scale; |
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130 // setup scale |
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131 ParameterBlock param = new ParameterBlock(); |
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132 param.addSource(img); |
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133 param.add(sf); |
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134 param.add(sf); |
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135 param.add(0f); |
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136 param.add(0f); |
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137 param.add(interpol); |
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138 // hint with border extender |
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139 RenderingHints hint = |
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140 new RenderingHints( |
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141 JAI.KEY_BORDER_EXTENDER, |
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142 BorderExtender.createInstance(BorderExtender.BORDER_COPY)); |
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143 |
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144 RenderedImage scaledImg = JAI.create("scale", param, hint); |
1 | 145 |
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146 //DEBUG |
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147 util.dprintln( |
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148 3, |
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149 "SCALE: " |
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150 + scale |
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151 + " ->" |
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152 + scaledImg.getWidth() |
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153 + "x" |
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154 + scaledImg.getHeight()); |
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155 |
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156 if (scaledImg == null) { |
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157 util.dprintln(2, "ERROR(scale): error in scale"); |
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158 throw new ImageOpException("Unable to scale"); |
73 | 159 } |
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160 img = scaledImg; |
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161 } |
1 | 162 |
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163 /* crops the current image */ |
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164 public void crop(int x_off, int y_off, int width, int height) |
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165 throws ImageOpException { |
73 | 166 // setup Crop |
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167 ParameterBlock param = new ParameterBlock(); |
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168 param.addSource(img); |
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169 param.add((float) x_off); |
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170 param.add((float) y_off); |
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171 param.add((float) width); |
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172 param.add((float) height); |
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173 RenderedImage croppedImg = JAI.create("crop", param); |
1 | 174 |
73 | 175 util.dprintln( |
176 3, | |
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177 "CROP: " |
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178 + x_off |
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179 + "," |
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180 + y_off |
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181 + ", " |
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182 + width |
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183 + "," |
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184 + height |
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185 + " ->" |
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186 + croppedImg.getWidth() |
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187 + "x" |
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188 + croppedImg.getHeight()); |
73 | 189 //DEBUG |
190 | |
191 if (croppedImg == null) { | |
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192 util.dprintln(2, "ERROR(crop): error in crop"); |
73 | 193 throw new ImageOpException("Unable to crop"); |
194 } | |
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195 img = croppedImg; |
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196 } |
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197 |
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198 /* rotates the current image */ |
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199 public void rotate(double angle) throws ImageOpException { |
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200 RenderedImage rotImg; |
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201 // convert degrees to radians |
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202 double rangle = Math.toRadians(angle); |
85 | 203 float x = getWidth()/2; |
204 float y = getHeight()/2; | |
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205 |
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206 // optimize rotation by right angles |
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207 TransposeType rotOp = null; |
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208 if (Math.abs(angle - 0) < epsilon) { |
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209 // 0 degree |
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210 return; |
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211 } else if (Math.abs(angle - 90) < epsilon) { |
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212 // 90 degree |
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213 rotOp = TransposeDescriptor.ROTATE_90; |
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214 } else if (Math.abs(angle - 180) < epsilon) { |
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215 // 180 degree |
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216 rotOp = TransposeDescriptor.ROTATE_180; |
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217 } else if (Math.abs(angle - 270) < epsilon) { |
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218 // 270 degree |
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219 rotOp = TransposeDescriptor.ROTATE_270; |
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220 } else if (Math.abs(angle - 360) < epsilon) { |
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221 // 360 degree |
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222 return; |
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223 } |
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224 if (rotOp != null) { |
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225 // use Transpose operation |
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226 ParameterBlock pb = new ParameterBlock(); |
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227 pb.addSource(img); |
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228 pb.add(rotOp); |
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229 rotImg = JAI.create("transpose", pb); |
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230 } else { |
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231 // setup "normal" rotation |
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232 ParameterBlock param = new ParameterBlock(); |
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233 param.addSource(img); |
85 | 234 param.add(x); |
235 param.add(y); | |
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236 param.add((float) rangle); |
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237 param.add(interpol); |
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238 // hint with border extender |
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239 RenderingHints hint = |
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240 new RenderingHints( |
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241 JAI.KEY_BORDER_EXTENDER, |
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242 BorderExtender.createInstance(BorderExtender.BORDER_COPY)); |
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243 |
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244 rotImg = JAI.create("rotate", param, hint); |
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245 } |
73 | 246 |
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247 util.dprintln( |
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248 3, |
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249 "ROTATE: " |
85 | 250 + x |
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251 + "," |
85 | 252 + y |
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253 + ", " |
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254 + angle |
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255 + " (" |
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256 + rangle |
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257 + ")" |
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258 + " ->" |
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259 + rotImg.getWidth() |
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260 + "x" |
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261 + rotImg.getHeight()); |
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262 //DEBUG |
1 | 263 |
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264 if (rotImg == null) { |
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265 util.dprintln(2, "ERROR: error in rotate"); |
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266 throw new ImageOpException("Unable to rotate"); |
73 | 267 } |
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268 img = rotImg; |
73 | 269 } |
1 | 270 |
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271 /* mirrors the current image |
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272 * works only horizontal and vertical |
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273 */ |
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274 public void mirror(double angle) throws ImageOpException { |
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275 RenderedImage mirImg; |
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276 |
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277 // only mirroring by right angles |
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278 TransposeType rotOp = null; |
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279 if (Math.abs(angle - 0) < epsilon) { |
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280 // 0 degree |
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281 rotOp = TransposeDescriptor.FLIP_HORIZONTAL; |
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282 } else if (Math.abs(angle - 90) < epsilon) { |
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283 // 90 degree |
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284 rotOp = TransposeDescriptor.FLIP_VERTICAL; |
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285 } else if (Math.abs(angle - 180) < epsilon) { |
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286 // 180 degree |
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287 rotOp = TransposeDescriptor.FLIP_HORIZONTAL; |
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288 } else if (Math.abs(angle - 270) < epsilon) { |
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289 // 270 degree |
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290 rotOp = TransposeDescriptor.FLIP_VERTICAL; |
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291 } else if (Math.abs(angle - 360) < epsilon) { |
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292 // 360 degree |
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293 rotOp = TransposeDescriptor.FLIP_HORIZONTAL; |
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294 } |
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295 if (rotOp != null) { |
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296 // use Transpose operation |
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297 ParameterBlock param = new ParameterBlock(); |
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298 param.addSource(img); |
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299 param.add(rotOp); |
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300 mirImg = JAI.create("transpose", param); |
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301 |
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302 util.dprintln( |
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303 3, |
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304 "MIRROR: " |
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305 + angle |
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306 + " ->" |
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307 + mirImg.getWidth() |
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308 + "x" |
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309 + mirImg.getHeight()); |
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310 //DEBUG |
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311 |
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312 if (mirImg == null) { |
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313 util.dprintln(2, "ERROR(mirror): error in mirror"); |
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314 throw new ImageOpException("Unable to mirror"); |
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315 } |
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316 img = mirImg; |
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317 } |
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318 } |
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319 |
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320 /* contrast and brightness enhancement */ |
86 | 321 public void enhance(float mult, float add) throws ImageOpException { |
79
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322 RenderedImage enhImg; |
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323 double[] ma = { mult }; |
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324 double[] aa = { add }; |
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325 // use Rescale operation |
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326 ParameterBlock param = new ParameterBlock(); |
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327 param.addSource(img); |
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328 param.add(ma); |
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329 param.add(aa); |
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330 enhImg = JAI.create("rescale", param); |
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331 |
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332 util.dprintln( |
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333 3, |
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334 "ENHANCE: *" |
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335 + mult |
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336 + ", +" |
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337 + add |
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338 + " ->" |
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339 + enhImg.getWidth() |
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340 + "x" |
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341 + enhImg.getHeight()); |
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342 //DEBUG |
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343 |
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344 if (enhImg == null) { |
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345 util.dprintln(2, "ERROR(enhance): error in enhance"); |
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346 throw new ImageOpException("Unable to enhance"); |
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347 } |
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348 img = enhImg; |
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349 } |
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350 |
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351 |
1 | 352 } |