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


javax.media.jai.OpImage
   javax.media.jai.AreaOpImage
      com.sun.media.jai.opimage.ErodeBinaryOpImage

ErodeBinaryOpImage
final class ErodeBinaryOpImage extends AreaOpImage (Code)
An OpImage class to perform erosion on a source image.

This class implements an erosion operation.

Grey Scale Erosion 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:

For a kernel K with a key position (xKey, yKey), the erosion of image I at (x,y) is given by:

 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.
 

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.

00X
0X0
X00

Note that zero kernel erosion has effects on the image, the location of the key position and size of kernel all matter.

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).

 // 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;
 }
 

The kernel cannot be bigger in any dimension than the image data.

Binary Image Erosion requires the kernel to be binary as well. Intuitively, binary erosion slides the kernel key position and place it at every non-zero 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

 [1 0 1] 
and the key position at the center.

Pseudo code for the erosion operation is as follows.

 // 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;
 }
 }
 }
 }
 

Reference: An Introduction to Nonlinear Image Processing, by Edward R. Bougherty and Jaakko Astola, Spie Optical Engineering Press, 1994.
See Also:   KernelJAI



Field Summary
protected  KernelJAIkernel
     The kernel with which to do the erode operation.

Constructor Summary
public  ErodeBinaryOpImage(RenderedImage source, BorderExtender extender, Map config, ImageLayout layout, KernelJAI kernel)
     Creates a ErodeBinaryOpImage given a ParameterBlock containing the image source and pre-rotated erosion kernel.

Method Summary
protected  voidcomputeRect(Raster[] sources, WritableRaster dest, Rectangle destRect)
     Performs erosion on a specified rectangle.

Field Detail
kernel
protected KernelJAI kernel(Code)
The kernel with which to do the erode operation.




Constructor Detail
ErodeBinaryOpImage
public ErodeBinaryOpImage(RenderedImage source, BorderExtender extender, Map config, ImageLayout layout, KernelJAI kernel)(Code)
Creates a ErodeBinaryOpImage 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.
Parameters:
  source - a RenderedImage.
Parameters:
  extender - a BorderExtender, or null.
Parameters:
  layout - an ImageLayout optionally containing the tile grid layout,SampleModel, and ColorModel, or null.
Parameters:
  kernel - the pre-rotated erosion KernelJAI.




Method Detail
computeRect
protected void computeRect(Raster[] sources, WritableRaster dest, Rectangle destRect)(Code)
Performs erosion on a specified rectangle. The sources are cobbled.
Parameters:
  sources - an array of source Rasters, guaranteed to provide allnecessary source data for computing the output.
Parameters:
  dest - a WritableRaster tile containing the area to be computed.
Parameters:
  destRect - the rectangle within dest to be processed.



Fields inherited from javax.media.jai.AreaOpImage
protected int bottomPadding(Code)(Java Doc)
protected BorderExtender extender(Code)(Java Doc)
protected int leftPadding(Code)(Java Doc)
protected int rightPadding(Code)(Java Doc)
protected int topPadding(Code)(Java Doc)

Methods inherited from javax.media.jai.AreaOpImage
public Raster computeTile(int tileX, int tileY)(Code)(Java Doc)
public BorderExtender getBorderExtender()(Code)(Java Doc)
public int getBottomPadding()(Code)(Java Doc)
public int getLeftPadding()(Code)(Java Doc)
public int getRightPadding()(Code)(Java Doc)
public int getTopPadding()(Code)(Java Doc)
public Rectangle mapDestRect(Rectangle destRect, int sourceIndex)(Code)(Java Doc)
public Rectangle mapSourceRect(Rectangle sourceRect, int sourceIndex)(Code)(Java Doc)

Fields inherited from javax.media.jai.OpImage
final public static int OP_COMPUTE_BOUND(Code)(Java Doc)
final public static int OP_IO_BOUND(Code)(Java Doc)
final public static int OP_NETWORK_BOUND(Code)(Java Doc)
protected transient TileCache cache(Code)(Java Doc)
protected boolean cobbleSources(Code)(Java Doc)
protected Object tileCacheMetric(Code)(Java Doc)
protected TileRecycler tileRecycler(Code)(Java Doc)

Methods inherited from javax.media.jai.OpImage
protected void addTileToCache(int tileX, int tileY, Raster tile)(Code)(Java Doc)
public void cancelTiles(TileRequest request, Point[] tileIndices)(Code)(Java Doc)
protected void computeRect(Raster[] sources, WritableRaster dest, Rectangle destRect)(Code)(Java Doc)
protected void computeRect(PlanarImage[] sources, WritableRaster dest, Rectangle destRect)(Code)(Java Doc)
public Raster computeTile(int tileX, int tileY)(Code)(Java Doc)
public boolean computesUniqueTiles()(Code)(Java Doc)
final protected WritableRaster createTile(int tileX, int tileY)(Code)(Java Doc)
public synchronized void dispose()(Code)(Java Doc)
public static int getExpandedNumBands(SampleModel sampleModel, ColorModel colorModel)(Code)(Java Doc)
protected synchronized RasterFormatTag[] getFormatTags()(Code)(Java Doc)
public int getOperationComputeType()(Code)(Java Doc)
public Raster getTile(int tileX, int tileY)(Code)(Java Doc)
public TileCache getTileCache()(Code)(Java Doc)
public Object getTileCacheMetric()(Code)(Java Doc)
public Point[] getTileDependencies(int tileX, int tileY, int sourceIndex)(Code)(Java Doc)
protected Raster getTileFromCache(int tileX, int tileY)(Code)(Java Doc)
public TileRecycler getTileRecycler()(Code)(Java Doc)
public Raster[] getTiles(Point[] tileIndices)(Code)(Java Doc)
public boolean hasExtender(int sourceIndex)(Code)(Java Doc)
public Point2D mapDestPoint(Point2D destPt, int sourceIndex)(Code)(Java Doc)
abstract public Rectangle mapDestRect(Rectangle destRect, int sourceIndex)(Code)(Java Doc)
public Point2D mapSourcePoint(Point2D sourcePt, int sourceIndex)(Code)(Java Doc)
abstract public Rectangle mapSourceRect(Rectangle sourceRect, int sourceIndex)(Code)(Java Doc)
public void prefetchTiles(Point[] tileIndices)(Code)(Java Doc)
public TileRequest queueTiles(Point[] tileIndices)(Code)(Java Doc)
protected void recycleTile(Raster tile)(Code)(Java Doc)
public void setTileCache(TileCache cache)(Code)(Java Doc)
protected static Vector vectorize(RenderedImage image)(Code)(Java Doc)
protected static Vector vectorize(RenderedImage image1, RenderedImage image2)(Code)(Java Doc)
protected static Vector vectorize(RenderedImage image1, RenderedImage image2, RenderedImage image3)(Code)(Java Doc)

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