Source Code Cross Referenced for ConvolveOpImage.java in  » 6.0-JDK-Modules » Java-Advanced-Imaging » com » sun » media » jai » opimage » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » Java Advanced Imaging » com.sun.media.jai.opimage 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $RCSfile: ConvolveOpImage.java,v $
003:         *
004:         * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
005:         *
006:         * Use is subject to license terms.
007:         *
008:         * $Revision: 1.1 $
009:         * $Date: 2005/02/11 04:56:20 $
010:         * $State: Exp $
011:         */
012:        package com.sun.media.jai.opimage;
013:
014:        import java.awt.Rectangle;
015:        import java.awt.image.DataBuffer;
016:        import java.awt.image.SampleModel;
017:        import java.awt.image.Raster;
018:        import java.awt.image.RenderedImage;
019:        import java.awt.image.WritableRaster;
020:        import java.awt.image.renderable.ParameterBlock;
021:        import java.awt.image.renderable.RenderedImageFactory;
022:        import javax.media.jai.AreaOpImage;
023:        import javax.media.jai.BorderExtender;
024:        import javax.media.jai.ImageLayout;
025:        import javax.media.jai.KernelJAI;
026:        import javax.media.jai.OpImage;
027:        import javax.media.jai.RasterAccessor;
028:        import javax.media.jai.RasterFormatTag;
029:        import java.util.Map;
030:
031:        // import com.sun.media.jai.test.OpImageTester;
032:
033:        /**
034:         * An OpImage class to perform convolution on a source image.
035:         *
036:         * <p> This class implements a convolution operation. Convolution is a
037:         * spatial operation that computes each output sample by multiplying
038:         * elements of a kernel with the samples surrounding a particular
039:         * source sample.
040:         *
041:         * <p> For each destination sample, the kernel is rotated 180 degrees
042:         * and its "key element" is placed over the source pixel corresponding
043:         * with the destination pixel.  The kernel elements are multiplied
044:         * with the source pixels under them, and the resulting products are
045:         * summed together to produce the destination sample value.
046:         * 
047:         * <p> Example code for the convolution operation on a single sample
048:         * dst[x][y] is as follows. First your original kernel is rotated
049:         * by 180 degrees, then the following - 
050:         * assuming the kernel is of size M rows x N columns
051:         * and the rotated kernel's key element is at position (xKey, yKey):
052:         *
053:         * <pre>
054:         * dst[x][y] = 0;
055:         * for (int i = -xKey; i < M - xKey; i++) {
056:         *     for (int j = -yKey; j < N - yKey; j++) {
057:         *         dst[x][y] += src[x + i][y + j] * kernel[xKey + i][yKey + j];
058:         *     }
059:         * }
060:         * </pre>
061:
062:         * <p> Convolution, or any neighborhood operation, leaves a band of
063:         * pixels around the edges undefined, i.e., for a 3x3 kernel, only
064:         * four kernel elements and four source pixels contribute to the
065:         * destination pixel located at (0,0).  Such pixels are not includined
066:         * in the destination image.  A BorderOpImage may be used to add an
067:         * appropriate border to the source image in order to avoid shrinkage
068:         * of the image boundaries.
069:         *
070:         * <p> The Kernel cannot be bigger in any dimension than the image data.
071:         *
072:         *
073:         * @see KernelJAI
074:         */
075:        final class ConvolveOpImage extends AreaOpImage {
076:
077:            /**
078:             * The kernel with which to do the convolve operation.
079:             */
080:            protected KernelJAI kernel;
081:
082:            /** Kernel variables. */
083:            private int kw, kh, kx, ky;
084:
085:            /**
086:             * Creates a ConvolveOpImage given a ParameterBlock containing the image
087:             * source and pre-rotated convolution kernel.  The image dimensions are 
088:             * derived
089:             * from the source image.  The tile grid layout, SampleModel, and
090:             * ColorModel may optionally be specified by an ImageLayout
091:             * object.
092:             *
093:             * @param source a RenderedImage.
094:             * @param extender a BorderExtender, or null.
095:             * @param layout an ImageLayout optionally containing the tile grid layout,
096:             *        SampleModel, and ColorModel, or null.
097:             * @param kernel the pre-rotated convolution KernelJAI.
098:             */
099:            public ConvolveOpImage(RenderedImage source,
100:                    BorderExtender extender, Map config, ImageLayout layout,
101:                    KernelJAI kernel) {
102:                super (source, layout, config, true, extender, kernel
103:                        .getLeftPadding(), kernel.getRightPadding(), kernel
104:                        .getTopPadding(), kernel.getBottomPadding());
105:
106:                this .kernel = kernel;
107:                kw = kernel.getWidth();
108:                kh = kernel.getHeight();
109:                kx = kernel.getXOrigin();
110:                ky = kernel.getYOrigin();
111:            }
112:
113:            /**
114:             * Performs convolution on a specified rectangle. The sources are
115:             * cobbled.
116:             *
117:             * @param sources an array of source Rasters, guaranteed to provide all
118:             *                necessary source data for computing the output.
119:             * @param dest a WritableRaster tile containing the area to be computed.
120:             * @param destRect the rectangle within dest to be processed.
121:             */
122:            protected void computeRect(Raster[] sources, WritableRaster dest,
123:                    Rectangle destRect) {
124:                // Retrieve format tags.
125:                RasterFormatTag[] formatTags = getFormatTags();
126:
127:                Raster source = sources[0];
128:                Rectangle srcRect = mapDestRect(destRect, 0);
129:
130:                RasterAccessor srcAccessor = new RasterAccessor(source,
131:                        srcRect, formatTags[0], getSourceImage(0)
132:                                .getColorModel());
133:                RasterAccessor dstAccessor = new RasterAccessor(dest, destRect,
134:                        formatTags[1], getColorModel());
135:
136:                switch (dstAccessor.getDataType()) {
137:                case DataBuffer.TYPE_BYTE:
138:                    byteLoop(srcAccessor, dstAccessor);
139:                    break;
140:                case DataBuffer.TYPE_INT:
141:                    intLoop(srcAccessor, dstAccessor);
142:                    break;
143:                case DataBuffer.TYPE_SHORT:
144:                    shortLoop(srcAccessor, dstAccessor);
145:                    break;
146:                case DataBuffer.TYPE_USHORT:
147:                    ushortLoop(srcAccessor, dstAccessor);
148:                    break;
149:                case DataBuffer.TYPE_FLOAT:
150:                    floatLoop(srcAccessor, dstAccessor);
151:                    break;
152:                case DataBuffer.TYPE_DOUBLE:
153:                    doubleLoop(srcAccessor, dstAccessor);
154:                    break;
155:
156:                default:
157:                }
158:
159:                // If the RasterAccessor object set up a temporary buffer for the
160:                // op to write to, tell the RasterAccessor to write that data
161:                // to the raster no that we're done with it.
162:                if (dstAccessor.isDataCopy()) {
163:                    dstAccessor.clampDataArrays();
164:                    dstAccessor.copyDataToRaster();
165:                }
166:            }
167:
168:            private void byteLoop(RasterAccessor src, RasterAccessor dst) {
169:                int dwidth = dst.getWidth();
170:                int dheight = dst.getHeight();
171:                int dnumBands = dst.getNumBands();
172:
173:                float[] kdata = kernel.getKernelData();
174:                int kw = kernel.getWidth();
175:                int kh = kernel.getHeight();
176:
177:                byte dstDataArrays[][] = dst.getByteDataArrays();
178:                int dstBandOffsets[] = dst.getBandOffsets();
179:                int dstPixelStride = dst.getPixelStride();
180:                int dstScanlineStride = dst.getScanlineStride();
181:
182:                byte srcDataArrays[][] = src.getByteDataArrays();
183:                int srcBandOffsets[] = src.getBandOffsets();
184:                int srcPixelStride = src.getPixelStride();
185:                int srcScanlineStride = src.getScanlineStride();
186:
187:                for (int k = 0; k < dnumBands; k++) {
188:                    byte dstData[] = dstDataArrays[k];
189:                    byte srcData[] = srcDataArrays[k];
190:                    int srcScanlineOffset = srcBandOffsets[k];
191:                    int dstScanlineOffset = dstBandOffsets[k];
192:                    for (int j = 0; j < dheight; j++) {
193:                        int srcPixelOffset = srcScanlineOffset;
194:                        int dstPixelOffset = dstScanlineOffset;
195:
196:                        for (int i = 0; i < dwidth; i++) {
197:                            float f = 0.5F;
198:                            int kernelVerticalOffset = 0;
199:                            int imageVerticalOffset = srcPixelOffset;
200:                            for (int u = 0; u < kh; u++) {
201:                                int imageOffset = imageVerticalOffset;
202:                                for (int v = 0; v < kw; v++) {
203:                                    f += ((int) srcData[imageOffset] & 0xff)
204:                                            * kdata[kernelVerticalOffset + v];
205:                                    imageOffset += srcPixelStride;
206:                                }
207:                                kernelVerticalOffset += kw;
208:                                imageVerticalOffset += srcScanlineStride;
209:                            }
210:
211:                            int val = (int) f;
212:                            if (val < 0) {
213:                                val = 0;
214:                            } else if (val > 255) {
215:                                val = 255;
216:                            }
217:                            dstData[dstPixelOffset] = (byte) val;
218:                            srcPixelOffset += srcPixelStride;
219:                            dstPixelOffset += dstPixelStride;
220:                        }
221:                        srcScanlineOffset += srcScanlineStride;
222:                        dstScanlineOffset += dstScanlineStride;
223:                    }
224:                }
225:            }
226:
227:            private void shortLoop(RasterAccessor src, RasterAccessor dst) {
228:                int dwidth = dst.getWidth();
229:                int dheight = dst.getHeight();
230:                int dnumBands = dst.getNumBands();
231:
232:                float[] kdata = kernel.getKernelData();
233:                int kw = kernel.getWidth();
234:                int kh = kernel.getHeight();
235:
236:                short dstDataArrays[][] = dst.getShortDataArrays();
237:                int dstBandOffsets[] = dst.getBandOffsets();
238:                int dstPixelStride = dst.getPixelStride();
239:                int dstScanlineStride = dst.getScanlineStride();
240:
241:                short srcDataArrays[][] = src.getShortDataArrays();
242:                int srcBandOffsets[] = src.getBandOffsets();
243:                int srcPixelStride = src.getPixelStride();
244:                int srcScanlineStride = src.getScanlineStride();
245:
246:                for (int k = 0; k < dnumBands; k++) {
247:                    short dstData[] = dstDataArrays[k];
248:                    short srcData[] = srcDataArrays[k];
249:                    int srcScanlineOffset = srcBandOffsets[k];
250:                    int dstScanlineOffset = dstBandOffsets[k];
251:                    for (int j = 0; j < dheight; j++) {
252:                        int srcPixelOffset = srcScanlineOffset;
253:                        int dstPixelOffset = dstScanlineOffset;
254:
255:                        for (int i = 0; i < dwidth; i++) {
256:                            float f = 0.5F;
257:                            int kernelVerticalOffset = 0;
258:                            int imageVerticalOffset = srcPixelOffset;
259:                            for (int u = 0; u < kh; u++) {
260:                                int imageOffset = imageVerticalOffset;
261:                                for (int v = 0; v < kw; v++) {
262:                                    f += (srcData[imageOffset])
263:                                            * kdata[kernelVerticalOffset + v];
264:                                    imageOffset += srcPixelStride;
265:                                }
266:                                kernelVerticalOffset += kw;
267:                                imageVerticalOffset += srcScanlineStride;
268:                            }
269:
270:                            int val = (int) f;
271:                            if (val < Short.MIN_VALUE) {
272:                                val = Short.MIN_VALUE;
273:                            } else if (val > Short.MAX_VALUE) {
274:                                val = Short.MAX_VALUE;
275:                            }
276:
277:                            dstData[dstPixelOffset] = (short) val;
278:                            srcPixelOffset += srcPixelStride;
279:                            dstPixelOffset += dstPixelStride;
280:                        }
281:                        srcScanlineOffset += srcScanlineStride;
282:                        dstScanlineOffset += dstScanlineStride;
283:                    }
284:                }
285:            }
286:
287:            private void ushortLoop(RasterAccessor src, RasterAccessor dst) {
288:                int dwidth = dst.getWidth();
289:                int dheight = dst.getHeight();
290:                int dnumBands = dst.getNumBands();
291:
292:                float[] kdata = kernel.getKernelData();
293:                int kw = kernel.getWidth();
294:                int kh = kernel.getHeight();
295:
296:                short dstDataArrays[][] = dst.getShortDataArrays();
297:                int dstBandOffsets[] = dst.getBandOffsets();
298:                int dstPixelStride = dst.getPixelStride();
299:                int dstScanlineStride = dst.getScanlineStride();
300:
301:                short srcDataArrays[][] = src.getShortDataArrays();
302:                int srcBandOffsets[] = src.getBandOffsets();
303:                int srcPixelStride = src.getPixelStride();
304:                int srcScanlineStride = src.getScanlineStride();
305:
306:                for (int k = 0; k < dnumBands; k++) {
307:                    short dstData[] = dstDataArrays[k];
308:                    short srcData[] = srcDataArrays[k];
309:                    int srcScanlineOffset = srcBandOffsets[k];
310:                    int dstScanlineOffset = dstBandOffsets[k];
311:                    for (int j = 0; j < dheight; j++) {
312:                        int srcPixelOffset = srcScanlineOffset;
313:                        int dstPixelOffset = dstScanlineOffset;
314:
315:                        for (int i = 0; i < dwidth; i++) {
316:                            float f = 0.5F;
317:                            int kernelVerticalOffset = 0;
318:                            int imageVerticalOffset = srcPixelOffset;
319:                            for (int u = 0; u < kh; u++) {
320:                                int imageOffset = imageVerticalOffset;
321:                                for (int v = 0; v < kw; v++) {
322:                                    f += (srcData[imageOffset] & 0xffff)
323:                                            * kdata[kernelVerticalOffset + v];
324:                                    imageOffset += srcPixelStride;
325:                                }
326:                                kernelVerticalOffset += kw;
327:                                imageVerticalOffset += srcScanlineStride;
328:                            }
329:                            int val = (int) f;
330:                            if (val < 0) {
331:                                val = 0;
332:                            } else if (val > 0xffff) {
333:                                val = 0xffff;
334:                            }
335:
336:                            dstData[dstPixelOffset] = (short) val;
337:                            srcPixelOffset += srcPixelStride;
338:                            dstPixelOffset += dstPixelStride;
339:                        }
340:                        srcScanlineOffset += srcScanlineStride;
341:                        dstScanlineOffset += dstScanlineStride;
342:                    }
343:                }
344:            }
345:
346:            private void intLoop(RasterAccessor src, RasterAccessor dst) {
347:                int dwidth = dst.getWidth();
348:                int dheight = dst.getHeight();
349:                int dnumBands = dst.getNumBands();
350:
351:                float[] kdata = kernel.getKernelData();
352:                int kw = kernel.getWidth();
353:                int kh = kernel.getHeight();
354:
355:                int dstDataArrays[][] = dst.getIntDataArrays();
356:                int dstBandOffsets[] = dst.getBandOffsets();
357:                int dstPixelStride = dst.getPixelStride();
358:                int dstScanlineStride = dst.getScanlineStride();
359:
360:                int srcDataArrays[][] = src.getIntDataArrays();
361:                int srcBandOffsets[] = src.getBandOffsets();
362:                int srcPixelStride = src.getPixelStride();
363:                int srcScanlineStride = src.getScanlineStride();
364:
365:                for (int k = 0; k < dnumBands; k++) {
366:                    int dstData[] = dstDataArrays[k];
367:                    int srcData[] = srcDataArrays[k];
368:                    int srcScanlineOffset = srcBandOffsets[k];
369:                    int dstScanlineOffset = dstBandOffsets[k];
370:                    for (int j = 0; j < dheight; j++) {
371:                        int srcPixelOffset = srcScanlineOffset;
372:                        int dstPixelOffset = dstScanlineOffset;
373:
374:                        for (int i = 0; i < dwidth; i++) {
375:                            float f = 0.5F;
376:                            int kernelVerticalOffset = 0;
377:                            int imageVerticalOffset = srcPixelOffset;
378:                            for (int u = 0; u < kh; u++) {
379:                                int imageOffset = imageVerticalOffset;
380:                                for (int v = 0; v < kw; v++) {
381:                                    f += ((int) srcData[imageOffset])
382:                                            * kdata[kernelVerticalOffset + v];
383:                                    imageOffset += srcPixelStride;
384:                                }
385:                                kernelVerticalOffset += kw;
386:                                imageVerticalOffset += srcScanlineStride;
387:                            }
388:
389:                            dstData[dstPixelOffset] = (int) f;
390:                            srcPixelOffset += srcPixelStride;
391:                            dstPixelOffset += dstPixelStride;
392:                        }
393:                        srcScanlineOffset += srcScanlineStride;
394:                        dstScanlineOffset += dstScanlineStride;
395:                    }
396:                }
397:            }
398:
399:            private void floatLoop(RasterAccessor src, RasterAccessor dst) {
400:                int dwidth = dst.getWidth();
401:                int dheight = dst.getHeight();
402:                int dnumBands = dst.getNumBands();
403:
404:                float[] kdata = kernel.getKernelData();
405:                int kw = kernel.getWidth();
406:                int kh = kernel.getHeight();
407:
408:                float dstDataArrays[][] = dst.getFloatDataArrays();
409:                int dstBandOffsets[] = dst.getBandOffsets();
410:                int dstPixelStride = dst.getPixelStride();
411:                int dstScanlineStride = dst.getScanlineStride();
412:
413:                float srcDataArrays[][] = src.getFloatDataArrays();
414:                int srcBandOffsets[] = src.getBandOffsets();
415:                int srcPixelStride = src.getPixelStride();
416:                int srcScanlineStride = src.getScanlineStride();
417:
418:                for (int k = 0; k < dnumBands; k++) {
419:                    float dstData[] = dstDataArrays[k];
420:                    float srcData[] = srcDataArrays[k];
421:                    int srcScanlineOffset = srcBandOffsets[k];
422:                    int dstScanlineOffset = dstBandOffsets[k];
423:                    for (int j = 0; j < dheight; j++) {
424:                        int srcPixelOffset = srcScanlineOffset;
425:                        int dstPixelOffset = dstScanlineOffset;
426:
427:                        for (int i = 0; i < dwidth; i++) {
428:                            float f = 0.0F;
429:                            int kernelVerticalOffset = 0;
430:                            int imageVerticalOffset = srcPixelOffset;
431:                            for (int u = 0; u < kh; u++) {
432:                                int imageOffset = imageVerticalOffset;
433:                                for (int v = 0; v < kw; v++) {
434:                                    f += (srcData[imageOffset])
435:                                            * kdata[kernelVerticalOffset + v];
436:                                    imageOffset += srcPixelStride;
437:                                }
438:                                kernelVerticalOffset += kw;
439:                                imageVerticalOffset += srcScanlineStride;
440:                            }
441:
442:                            dstData[dstPixelOffset] = f;
443:                            srcPixelOffset += srcPixelStride;
444:                            dstPixelOffset += dstPixelStride;
445:                        }
446:                        srcScanlineOffset += srcScanlineStride;
447:                        dstScanlineOffset += dstScanlineStride;
448:                    }
449:                }
450:            }
451:
452:            private void doubleLoop(RasterAccessor src, RasterAccessor dst) {
453:                int dwidth = dst.getWidth();
454:                int dheight = dst.getHeight();
455:                int dnumBands = dst.getNumBands();
456:
457:                float[] kdata = kernel.getKernelData();
458:                int kw = kernel.getWidth();
459:                int kh = kernel.getHeight();
460:
461:                double dstDataArrays[][] = dst.getDoubleDataArrays();
462:                int dstBandOffsets[] = dst.getBandOffsets();
463:                int dstPixelStride = dst.getPixelStride();
464:                int dstScanlineStride = dst.getScanlineStride();
465:
466:                double srcDataArrays[][] = src.getDoubleDataArrays();
467:                int srcBandOffsets[] = src.getBandOffsets();
468:                int srcPixelStride = src.getPixelStride();
469:                int srcScanlineStride = src.getScanlineStride();
470:
471:                for (int k = 0; k < dnumBands; k++) {
472:                    double dstData[] = dstDataArrays[k];
473:                    double srcData[] = srcDataArrays[k];
474:                    int srcScanlineOffset = srcBandOffsets[k];
475:                    int dstScanlineOffset = dstBandOffsets[k];
476:                    for (int j = 0; j < dheight; j++) {
477:                        int srcPixelOffset = srcScanlineOffset;
478:                        int dstPixelOffset = dstScanlineOffset;
479:
480:                        for (int i = 0; i < dwidth; i++) {
481:                            double f = 0.5;
482:                            int kernelVerticalOffset = 0;
483:                            int imageVerticalOffset = srcPixelOffset;
484:                            for (int u = 0; u < kh; u++) {
485:                                int imageOffset = imageVerticalOffset;
486:                                for (int v = 0; v < kw; v++) {
487:                                    f += (srcData[imageOffset])
488:                                            * kdata[kernelVerticalOffset + v];
489:                                    imageOffset += srcPixelStride;
490:                                }
491:                                kernelVerticalOffset += kw;
492:                                imageVerticalOffset += srcScanlineStride;
493:                            }
494:
495:                            dstData[dstPixelOffset] = f;
496:                            srcPixelOffset += srcPixelStride;
497:                            dstPixelOffset += dstPixelStride;
498:                        }
499:                        srcScanlineOffset += srcScanlineStride;
500:                        dstScanlineOffset += dstScanlineStride;
501:                    }
502:                }
503:            }
504:
505:            //     public static OpImage createTestImage(OpImageTester oit) {
506:            //         float data[] = {0.05f,0.10f,0.05f,
507:            //                         0.10f,0.40f,0.10f,
508:            //                         0.05f,0.10f,0.05f};
509:            //         KernelJAI kJAI = new KernelJAI(3,3,1,1,data);
510:            //         return new ConvolveOpImage(oit.getSource(), null, null,
511:            //                                    new ImageLayout(oit.getSource()),
512:            //                                    kJAI);
513:            //     }
514:
515:            //     public static void main(String args[]) {
516:            //         String classname = "com.sun.media.jai.opimage.ConvolveOpImage";
517:            //         OpImageTester.performDiagnostics(classname,args);
518:            //     }
519:        }
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