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


javax.media.jai.OpImage
   javax.media.jai.AreaOpImage
      com.sun.media.jai.mlib.MlibConvolveOpImage

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

This class implements a convolution operation. Convolution is a spatial operation that computes each output sample by multiplying elements of a kernel with the samples surrounding a particular source sample.

For each destination sample, the kernel is rotated 180 degrees and its "key element" is placed over the source pixel corresponding with the destination pixel. The kernel elements are multiplied with the source pixels under them, and the resulting products are summed together to produce the destination sample value.

Example code for the convolution operation on a single sample dst[x][y] is as follows, assuming the kernel is of size M rows x N columns and has already been rotated through 180 degrees. The kernel's key element is located at position (xKey, yKey):

 dst[x][y] = 0;
 for (int i = -xKey; i < M - xKey; i++) {
 for (int j = -yKey; j < N - yKey; j++) {
 dst[x][y] += src[x + i][y + j] * kernel[xKey + i][yKey + j];
 }
 }
 

Convolution, or any neighborhood operation, leaves a band of pixels around the edges undefined, i.e., for a 3x3 kernel, only four kernel elements and four source pixels contribute to the destination pixel located at (0,0). Such pixels are not includined in the destination image, unless a non-null BorderExtender is provided.

The Kernel cannot be bigger in any dimension than the image data.
See Also:   KernelJAI



Field Summary
 doubledoublekData
    
 intintkData
    
 floatkData
    
protected  KernelJAIkernel
     The kernel with which to do the convolve operation.
 intshift
    

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

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

Field Detail
doublekData
double doublekData(Code)



intkData
int intkData(Code)



kData
float kData(Code)



kernel
protected KernelJAI kernel(Code)
The kernel with which to do the convolve operation.



shift
int shift(Code)




Constructor Detail
MlibConvolveOpImage
public MlibConvolveOpImage(RenderedImage source, BorderExtender extender, Map config, ImageLayout layout, KernelJAI kernel)(Code)
Creates a MlibConvolveOpImage given the image source and pre-rotated convolution 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.or null. If null, a default cache will be used.
Parameters:
  layout - an ImageLayout optionally containing the tile grid layout,SampleModel, and ColorModel, or null.
Parameters:
  kernel - the pre-rotated convolution KernelJAI.




Method Detail
computeRect
protected void computeRect(Raster[] sources, WritableRaster dest, Rectangle destRect)(Code)
Performs convolution 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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