org.geotools.image.jai
Class Hysteresis

java.lang.Object
  javax.media.jai.PlanarImage
      javax.media.jai.OpImage
          javax.media.jai.UntiledOpImage
              org.geotools.image.jai.Hysteresis

All Implemented Interfaces:

javax.media.jai.ImageJAI, javax.media.jai.PropertyChangeEmitter, javax.media.jai.PropertySource, java.awt.image.RenderedImage, javax.media.jai.WritablePropertySource

public class Hysteresis

extends javax.media.jai.UntiledOpImage

Effectue un seuillage par hysteresis sur une image. L'op?ration de seuillage s'effectue de la mani?re suivante:

On dispose d'un seuil haut, sh, et d'un seuil bas, sb. Si la valeur d'un pixel est sup?rieur ? sh, on la conserve, elle nous interesse. Si cette valeur est inf?rieure ? sb, on la supprime. Si elle est entre les deux on dit le pixel indetermin? et on ne le conserve que s'il est proche d'un pixel dont la valeur est au dessus de sh, ou proche d'un pixel ind?termin? que l'on a pr?c?dement trouv? proche d'un pixel de valeur sup?rieure ? sh. Cette recherche se fait de mani?re it?rative, jusqu'? ce que le point ind?termin? n'est plus de voisins satisfaisants.

Since:

2.1

Version:

$Id: Hysteresis.java 17672 2006-01-19 00:25:55Z desruisseaux $

Author:

Lionel Flahaut, Martin Desruisseaux

Field Summary

Fields inherited from class javax.media.jai.OpImage

cache, cobbleSources, OP_COMPUTE_BOUND, OP_IO_BOUND, OP_NETWORK_BOUND, tileCacheMetric, tileRecycler

Fields inherited from class javax.media.jai.PlanarImage

colorModel, eventManager, height, minX, minY, properties, sampleModel, tileFactory, tileGridXOffset, tileGridYOffset, tileHeight, tileWidth, width

Constructor Summary

protected

Hysteresis(java.awt.image.RenderedImage source, javax.media.jai.ImageLayout layout, java.util.Map map, double low, double high, double padValue) Constructs a new Hysterisis filter for the given image.

Method Summary

protected void

computeImage(java.awt.image.Raster[] sources, java.awt.image.WritableRaster dest, java.awt.Rectangle destRect) Computes the whole image.

Methods inherited from class javax.media.jai.UntiledOpImage

computeTile, getTileDependencies, mapDestRect, mapSourceRect

Methods inherited from class javax.media.jai.OpImage

addTileToCache, cancelTiles, computeRect, computeRect, computesUniqueTiles, createTile, dispose, getExpandedNumBands, getFormatTags, getOperationComputeType, getTile, getTileCache, getTileCacheMetric, getTileFromCache, getTileRecycler, getTiles, hasExtender, mapDestPoint, mapSourcePoint, prefetchTiles, queueTiles, recycleTile, setTileCache, vectorize, vectorize, vectorize

Methods inherited from class javax.media.jai.PlanarImage

addPropertyChangeListener, addPropertyChangeListener, addSink, addSink, addSource, addTileComputationListener, copyData, copyData, copyExtendedData, createColorModel, createSnapshot, createWritableRaster, finalize, getAsBufferedImage, getAsBufferedImage, getBounds, getColorModel, getData, getData, getDefaultColorModel, getExtendedData, getGraphics, getHeight, getImageID, getMaxTileX, getMaxTileY, getMaxX, getMaxY, getMinTileX, getMinTileY, getMinX, getMinY, getNumBands, getNumSources, getNumXTiles, getNumYTiles, getProperties, getProperty, getPropertyClass, getPropertyNames, getPropertyNames, getSampleModel, getSinks, getSource, getSourceImage, getSourceObject, getSources, getSplits, getTileComputationListeners, getTileFactory, getTileGridXOffset, getTileGridYOffset, getTileHeight, getTileIndices, getTileRect, getTiles, getTileWidth, getWidth, overlapsMultipleTiles, removeProperty, removePropertyChangeListener, removePropertyChangeListener, removeSink, removeSink, removeSinks, removeSource, removeSources, removeTileComputationListener, setImageLayout, setProperties, setProperty, setSource, setSources, tileXToX, tileXToX, tileYToY, tileYToY, toString, wrapRenderedImage, XToTileX, XToTileX, YToTileY, YToTileY

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Hysteresis

protected Hysteresis(java.awt.image.RenderedImage source,
                     javax.media.jai.ImageLayout layout,
                     java.util.Map map,
                     double low,
                     double high,
                     double padValue)

Constructs a new Hysterisis filter for the given image.

Parameters:

source - The source image.

layout - The image layout.

map - The rendering hints and image properties.

low - The low threshold value, inclusive.

high - The high threshold value, inclusive.

padValue - The value to give to filtered pixel.

Method Detail

computeImage

protected void computeImage(java.awt.image.Raster[] sources,
                            java.awt.image.WritableRaster dest,
                            java.awt.Rectangle destRect)

Computes the whole image.