/*
* $RCSfile: ErodeOpImage.java,v $
*
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
*
* Use is subject to license terms.
*
* $Revision: 1.1 $
* $Date: 2005/02/11 04:56:24 $
* $State: Exp $
*/
package com.lightcrafts.media.jai.opimage;
import java.awt.Rectangle;
import java.awt.image.DataBuffer;
import java.awt.image.Raster;
import java.awt.image.RenderedImage;
import java.awt.image.WritableRaster;
import com.lightcrafts.mediax.jai.AreaOpImage;
import com.lightcrafts.mediax.jai.BorderExtender;
import com.lightcrafts.mediax.jai.ImageLayout;
import com.lightcrafts.mediax.jai.KernelJAI;
import com.lightcrafts.mediax.jai.RasterAccessor;
import com.lightcrafts.mediax.jai.RasterFormatTag;
import java.util.Map;
// import com.lightcrafts.media.jai.test.OpImageTester;
/**
*
* An OpImage class to perform erosion on a source image.
*
* <p> This class implements an erosion operation.
*
* <p> <b>Grey Scale Erosion</b>
* is a spatial operation that computes
* each output sample by subtract elements of a kernel to the samples
* surrounding a particular source sample with some care.
* A mathematical expression is:
*
* <p> For a kernel K with a key position (xKey, yKey), the erosion
* of image I at (x,y) is given by:
* <pre>
* max{a: a + K(xKey+i, yKey+j) <= I(x+i,y+j): all (i,j) }
*
* all possible (i,j) means that both I(x+i,y+j) and K(xKey+i, yKey+j)
* are in bounds. Otherwise, the value is set to 0.
*
* </pre>
* <p> Intuitively, the kernel is like an unbrella and the key point
* is the handle. At every point, you try to push the umbrella up as high
* as possible but still underneath the image surface. The final height
* of the handle is the value after erosion. Thus if you want the image
* to erode from the upper right to bottom left, the following would do.
*
* <p><center>
* <table border=1>
* <tr align=center><td>0</td><td>0</td><td>X</td> </tr>
* <tr align=center><td>0</td><td>X</td><td>0</td> </tr>
* <tr align=center><td><b>X</b></td><td>0</td><td>0</td> </tr>
* </table></center>
*
* <p> Note that zero kernel erosion has effects on the image, the
* location of the key position and size of kernel all matter.
*
* <p> Pseudo code for the erosion operation is as follows.
* Assuming the kernel K is of size M rows x N cols
* and the key position is (xKey, yKey).
*
* <pre>
*
* // erosion
* for every dst pixel location (x,y){
* tmp = infinity;
* for (i = -xKey; i < M - xKey; i++){
* for (j = -yKey; j < N - yKey; j++){
* if((x+i, y+j) are in bounds of src){
* tmp = min{tmp, src[x + i][y + j] - K[xKey + i][yKey + j]};
* }
* }
* }
* dst[x][y] = tmp;
* if (dst[x][y] == infinity)
* dst[x][y] = 0;
* }
* </pre>
*
* <p> The kernel cannot be bigger in any dimension than the image data.
*
* <p> <b>Binary Image Erosion</b>
* requires the kernel to be binary as well.
* Intuitively, binary erosion slides the kernel
* key position and place it at every point (x,y) in the src image.
* The dst value at this position is set to 1 if all the kernel
* are fully supported by the src image, and the src image value is 1
* whenever the kernel has value 1.
* Otherwise, the value after erosion at (x,y) is set to 0.
* Erosion usually shrinks images, but it can fill holes
* with kernels like
* <pre> [1 <b>0</b> 1] </pre>
* and the key position at the center.
*
* <p> Pseudo code for the erosion operation is as follows.
*
* <pre>
* // erosion
* for every dst pixel location (x,y){
* dst[x][y] = 1;
* for (i = -xKey; i < M - xKey; i++){
* for (j = -yKey; j < N - yKey; j++){
* if((x+i,y+j) is out of bounds of src ||
* src(x+i, y+j)==0 && Key(xKey+i, yKey+j)==1){
* dst[x][y] = 0; break;
* }
* }
* }
* }
* </pre>
*
* <p> Reference: An Introduction to Nonlinear Image Processing,
* by Edward R. Bougherty and Jaakko Astola,
* Spie Optical Engineering Press, 1994.
*
*
* @see KernelJAI
*/
final class ErodeOpImage extends AreaOpImage {
/**
* The kernel with which to do the erode operation.
*/
protected KernelJAI kernel;
/** Kernel variables. */
private int kw, kh, kx, ky;
private float[] kdata;
/**
* Creates a ErodeOpImage given a ParameterBlock containing the image
* source and pre-rotated erosion kernel. The image dimensions are
* derived
* from the source image. The tile grid layout, SampleModel, and
* ColorModel may optionally be specified by an ImageLayout
* object.
*
* @param source a RenderedImage.
* @param extender a BorderExtender, or null.
* @param layout an ImageLayout optionally containing the tile grid layout,
* SampleModel, and ColorModel, or null.
* @param kernel the pre-rotated erosion KernelJAI.
*/
public ErodeOpImage(RenderedImage source,
BorderExtender extender,
Map config,
ImageLayout layout,
KernelJAI kernel) {
super(source,
layout,
config,
true,
extender,
kernel.getLeftPadding(),
kernel.getRightPadding(),
kernel.getTopPadding(),
kernel.getBottomPadding());
this.kernel = kernel;
kw = kernel.getWidth();
kh = kernel.getHeight();
kx = kernel.getXOrigin();
ky = kernel.getYOrigin();
kdata = kernel.getKernelData();
}
/**
* Performs erosion on a specified rectangle. The sources are
* cobbled.
*
* @param sources an array of source Rasters, guaranteed to provide all
* necessary source data for computing the output.
* @param dest a WritableRaster tile containing the area to be computed.
* @param destRect the rectangle within dest to be processed.
*/
protected void computeRect(Raster[] sources,
WritableRaster dest,
Rectangle destRect) {
// Retrieve format tags.
RasterFormatTag[] formatTags = getFormatTags();
Raster source = sources[0];
Rectangle srcRect = mapDestRect(destRect, 0);
RasterAccessor srcAccessor =
new RasterAccessor(source, srcRect,
formatTags[0], getSourceImage(0).getColorModel());
RasterAccessor dstAccessor =
new RasterAccessor(dest, destRect,
formatTags[1], getColorModel());
switch (dstAccessor.getDataType()) {
case DataBuffer.TYPE_BYTE:
byteLoop(srcAccessor, dstAccessor);
break;
case DataBuffer.TYPE_INT:
intLoop(srcAccessor, dstAccessor);
break;
case DataBuffer.TYPE_SHORT:
shortLoop(srcAccessor, dstAccessor);
break;
case DataBuffer.TYPE_USHORT:
ushortLoop(srcAccessor, dstAccessor);
break;
case DataBuffer.TYPE_FLOAT:
floatLoop(srcAccessor, dstAccessor);
break;
case DataBuffer.TYPE_DOUBLE:
doubleLoop(srcAccessor, dstAccessor);
break;
default:
}
// If the RasterAccessor object set up a temporary buffer for the
// op to write to, tell the RasterAccessor to write that data
// to the raster no that we're done with it.
if (dstAccessor.isDataCopy()) {
dstAccessor.clampDataArrays();
dstAccessor.copyDataToRaster();
}
}
private void byteLoop(RasterAccessor src, RasterAccessor dst) {
int dwidth = dst.getWidth();
int dheight = dst.getHeight();
int dnumBands = dst.getNumBands();
int dstBandOffsets[] = dst.getBandOffsets();
int dstPixelStride = dst.getPixelStride();
int dstScanlineStride = dst.getScanlineStride();
int srcBandOffsets[] = src.getBandOffsets();
int srcPixelStride = src.getPixelStride();
int srcScanlineStride = src.getScanlineStride();
byte dstDataArrays[][] = dst.getByteDataArrays();
byte srcDataArrays[][] = src.getByteDataArrays();
for (int k = 0; k < dnumBands; k++) {
byte dstData[] = dstDataArrays[k];
byte srcData[] = srcDataArrays[k];
int srcScanlineOffset = srcBandOffsets[k];
int dstScanlineOffset = dstBandOffsets[k];
for (int j = 0; j < dheight; j++) {
int srcPixelOffset = srcScanlineOffset;
int dstPixelOffset = dstScanlineOffset;
for (int i = 0; i < dwidth; i++) {
int kernelVerticalOffset = 0;
int imageVerticalOffset = srcPixelOffset;
float f = Float.POSITIVE_INFINITY;
for (int u = 0; u < kh; u++) {
int imageOffset = imageVerticalOffset;
for (int v = 0; v < kw; v++) {
float tmpIK = ((int)srcData[imageOffset]&0xff) -
kdata[kernelVerticalOffset + v];
if(tmpIK < f){
f = tmpIK;
}
imageOffset += srcPixelStride;
}
kernelVerticalOffset += kw;
imageVerticalOffset += srcScanlineStride;
}
if (Float.isInfinite(f)){
f = 0;
}
int val = (int)f;
if (val < 0) {
val = 0;
} else if (val > 255) {
val = 255;
}
dstData[dstPixelOffset] = (byte)val;
srcPixelOffset += srcPixelStride;
dstPixelOffset += dstPixelStride;
}
srcScanlineOffset += srcScanlineStride;
dstScanlineOffset += dstScanlineStride;
}
}
}
private void shortLoop(RasterAccessor src, RasterAccessor dst) {
int dwidth = dst.getWidth();
int dheight = dst.getHeight();
int dnumBands = dst.getNumBands();
int dstBandOffsets[] = dst.getBandOffsets();
int dstPixelStride = dst.getPixelStride();
int dstScanlineStride = dst.getScanlineStride();
int srcBandOffsets[] = src.getBandOffsets();
int srcPixelStride = src.getPixelStride();
int srcScanlineStride = src.getScanlineStride();
short dstDataArrays[][] = dst.getShortDataArrays();
short srcDataArrays[][] = src.getShortDataArrays();
for (int k = 0; k < dnumBands; k++) {
short dstData[] = dstDataArrays[k];
short srcData[] = srcDataArrays[k];
int srcScanlineOffset = srcBandOffsets[k];
int dstScanlineOffset = dstBandOffsets[k];
for (int j = 0; j < dheight; j++) {
int srcPixelOffset = srcScanlineOffset;
int dstPixelOffset = dstScanlineOffset;
for (int i = 0; i < dwidth; i++) {
int kernelVerticalOffset = 0;
int imageVerticalOffset = srcPixelOffset;
float f = Float.POSITIVE_INFINITY;
for (int u = 0; u < kh; u++) {
int imageOffset = imageVerticalOffset;
for (int v = 0; v < kw; v++) {
float tmpIK = srcData[imageOffset] -
kdata[kernelVerticalOffset + v];
if(tmpIK < f){
f = tmpIK;
}
imageOffset += srcPixelStride;
}
kernelVerticalOffset += kw;
imageVerticalOffset += srcScanlineStride;
}
if (Float.isInfinite(f)){
f = 0.0F;
}
int val = (int)f;
if (val < Short.MIN_VALUE) {
val = Short.MIN_VALUE;
} else if (val > Short.MAX_VALUE) {
val = Short.MAX_VALUE;
}
dstData[dstPixelOffset] = (short)val;
srcPixelOffset += srcPixelStride;
dstPixelOffset += dstPixelStride;
}
srcScanlineOffset += srcScanlineStride;
dstScanlineOffset += dstScanlineStride;
}
}
}
private void ushortLoop(RasterAccessor src, RasterAccessor dst) {
int dwidth = dst.getWidth();
int dheight = dst.getHeight();
int dnumBands = dst.getNumBands();
int dstBandOffsets[] = dst.getBandOffsets();
int dstPixelStride = dst.getPixelStride();
int dstScanlineStride = dst.getScanlineStride();
int srcBandOffsets[] = src.getBandOffsets();
int srcPixelStride = src.getPixelStride();
int srcScanlineStride = src.getScanlineStride();
short dstDataArrays[][] = dst.getShortDataArrays();
short srcDataArrays[][] = src.getShortDataArrays();
for (int k = 0; k < dnumBands; k++) {
short dstData[] = dstDataArrays[k];
short srcData[] = srcDataArrays[k];
int srcScanlineOffset = srcBandOffsets[k];
int dstScanlineOffset = dstBandOffsets[k];
for (int j = 0; j < dheight; j++) {
int srcPixelOffset = srcScanlineOffset;
int dstPixelOffset = dstScanlineOffset;
for (int i = 0; i < dwidth; i++) {
int kernelVerticalOffset = 0;
int imageVerticalOffset = srcPixelOffset;
float f = Float.POSITIVE_INFINITY;
for (int u = 0; u < kh; u++) {
int imageOffset = imageVerticalOffset;
for (int v = 0; v < kw; v++) {
float tmpIK = (srcData[imageOffset] & 0xffff) -
kdata[kernelVerticalOffset + v];
if(tmpIK < f){
f = tmpIK;
}
imageOffset += srcPixelStride;
}
kernelVerticalOffset += kw;
imageVerticalOffset += srcScanlineStride;
}
if (Float.isInfinite(f)){
f = 0.0F;
}
int val = (int)f;
if (val < 0) {
val = 0;
} else if (val > 0xffff) {
val = 0xffff;
}
dstData[dstPixelOffset] = (short)val;
srcPixelOffset += srcPixelStride;
dstPixelOffset += dstPixelStride;
}
srcScanlineOffset += srcScanlineStride;
dstScanlineOffset += dstScanlineStride;
}
}
}
private void intLoop(RasterAccessor src, RasterAccessor dst) {
int dwidth = dst.getWidth();
int dheight = dst.getHeight();
int dnumBands = dst.getNumBands();
int dstBandOffsets[] = dst.getBandOffsets();
int dstPixelStride = dst.getPixelStride();
int dstScanlineStride = dst.getScanlineStride();
int srcBandOffsets[] = src.getBandOffsets();
int srcPixelStride = src.getPixelStride();
int srcScanlineStride = src.getScanlineStride();
int dstDataArrays[][] = dst.getIntDataArrays();
int srcDataArrays[][] = src.getIntDataArrays();
for (int k = 0; k < dnumBands; k++) {
int dstData[] = dstDataArrays[k];
int srcData[] = srcDataArrays[k];
int srcScanlineOffset = srcBandOffsets[k];
int dstScanlineOffset = dstBandOffsets[k];
for (int j = 0; j < dheight; j++) {
int srcPixelOffset = srcScanlineOffset;
int dstPixelOffset = dstScanlineOffset;
for (int i = 0; i < dwidth; i++) {
int kernelVerticalOffset = 0;
int imageVerticalOffset = srcPixelOffset;
float f = Float.POSITIVE_INFINITY;
for (int u = 0; u < kh; u++) {
int imageOffset = imageVerticalOffset;
for (int v = 0; v < kw; v++) {
float tmpIK = (int)srcData[imageOffset] -
kdata[kernelVerticalOffset + v];
if(tmpIK < f){
f = tmpIK;
}
imageOffset += srcPixelStride;
}
kernelVerticalOffset += kw;
imageVerticalOffset += srcScanlineStride;
}
if (Float.isInfinite(f)){
f = 0.0F;
}
dstData[dstPixelOffset] = (int)f;
srcPixelOffset += srcPixelStride;
dstPixelOffset += dstPixelStride;
}
srcScanlineOffset += srcScanlineStride;
dstScanlineOffset += dstScanlineStride;
}
}
}
private void floatLoop(RasterAccessor src, RasterAccessor dst) {
int dwidth = dst.getWidth();
int dheight = dst.getHeight();
int dnumBands = dst.getNumBands();
int dstBandOffsets[] = dst.getBandOffsets();
int dstPixelStride = dst.getPixelStride();
int dstScanlineStride = dst.getScanlineStride();
int srcBandOffsets[] = src.getBandOffsets();
int srcPixelStride = src.getPixelStride();
int srcScanlineStride = src.getScanlineStride();
float dstDataArrays[][] = dst.getFloatDataArrays();
float srcDataArrays[][] = src.getFloatDataArrays();
for (int k = 0; k < dnumBands; k++) {
float dstData[] = dstDataArrays[k];
float srcData[] = srcDataArrays[k];
int srcScanlineOffset = srcBandOffsets[k];
int dstScanlineOffset = dstBandOffsets[k];
for (int j = 0; j < dheight; j++) {
int srcPixelOffset = srcScanlineOffset;
int dstPixelOffset = dstScanlineOffset;
for (int i = 0; i < dwidth; i++) {
int kernelVerticalOffset = 0;
int imageVerticalOffset = srcPixelOffset;
float f = Float.POSITIVE_INFINITY;
for (int u = 0; u < kh; u++) {
int imageOffset = imageVerticalOffset;
for (int v = 0; v < kw; v++) {
float tmpIK = srcData[imageOffset] -
kdata[kernelVerticalOffset + v];
if(tmpIK < f){
f = tmpIK;
}
imageOffset += srcPixelStride;
}
kernelVerticalOffset += kw;
imageVerticalOffset += srcScanlineStride;
}
if (Float.isInfinite(f)){
f = 0.0F;
}
dstData[dstPixelOffset] = f;
srcPixelOffset += srcPixelStride;
dstPixelOffset += dstPixelStride;
}
srcScanlineOffset += srcScanlineStride;
dstScanlineOffset += dstScanlineStride;
}
}
}
private void doubleLoop(RasterAccessor src, RasterAccessor dst) {
int dwidth = dst.getWidth();
int dheight = dst.getHeight();
int dnumBands = dst.getNumBands();
int dstBandOffsets[] = dst.getBandOffsets();
int dstPixelStride = dst.getPixelStride();
int dstScanlineStride = dst.getScanlineStride();
int srcBandOffsets[] = src.getBandOffsets();
int srcPixelStride = src.getPixelStride();
int srcScanlineStride = src.getScanlineStride();
double dstDataArrays[][] = dst.getDoubleDataArrays();
double srcDataArrays[][] = src.getDoubleDataArrays();
for (int k = 0; k < dnumBands; k++) {
double dstData[] = dstDataArrays[k];
double srcData[] = srcDataArrays[k];
int srcScanlineOffset = srcBandOffsets[k];
int dstScanlineOffset = dstBandOffsets[k];
for (int j = 0; j < dheight; j++) {
int srcPixelOffset = srcScanlineOffset;
int dstPixelOffset = dstScanlineOffset;
for (int i = 0; i < dwidth; i++) {
int kernelVerticalOffset = 0;
int imageVerticalOffset = srcPixelOffset;
double f = Double.POSITIVE_INFINITY;
for (int u = 0; u < kh; u++) {
int imageOffset = imageVerticalOffset;
for (int v = 0; v < kw; v++) {
double tmpIK = srcData[imageOffset] -
kdata[kernelVerticalOffset + v];
if(tmpIK < f){
f = tmpIK;
}
imageOffset += srcPixelStride;
}
kernelVerticalOffset += kw;
imageVerticalOffset += srcScanlineStride;
}
if (Double.isInfinite(f)){
f = 0.0D;
}
dstData[dstPixelOffset] = f;
srcPixelOffset += srcPixelStride;
dstPixelOffset += dstPixelStride;
}
srcScanlineOffset += srcScanlineStride;
dstScanlineOffset += dstScanlineStride;
}
}
}
}