org.geotools.image.jai
Class Hysteresis
Object
PlanarImage
OpImage
UntiledOpImage
Hysteresis
- All Implemented Interfaces:
- RenderedImage, ImageJAI, PropertyChangeEmitter, PropertySource, WritablePropertySource
public class Hysteresis
- extends UntiledOpImage
Effectue un seuillage par hysteresis sur une image.
L'opération de seuillage s'effectue de la manière suivante:
On dispose d'un seuil haut, sh, et d'un seuil bas, sb.
Si la valeur d'un pixel est supérieur à sh, on la conserve, elle
nous interesse. Si cette valeur est inférieure à sb, on la supprime.
Si elle est entre les deux on dit le pixel indeterminé 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 indéterminé que l'on a précédement trouvé proche d'un pixel
de valeur supérieure à sh. Cette recherche se fait de manière itérative,
jusqu'à ce que le point indéterminé n'est plus de voisins satisfaisants.
- Since:
- 2.1
- Author:
- Lionel Flahaut (2ie Technologie, IRD), Martin Desruisseaux
- Module:
modules/library/coverage (gt-coverage.jar)
Fields inherited from class PlanarImage |
colorModel, eventManager, height, minX, minY, properties, sampleModel, tileFactory, tileGridXOffset, tileGridYOffset, tileHeight, tileWidth, width |
Constructor Summary |
protected |
Hysteresis(RenderedImage source,
ImageLayout layout,
Map map,
double low,
double high,
double padValue)
Constructs a new Hysterisis filter for the given image. |
Methods inherited from class 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 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 |
Hysteresis
protected Hysteresis(RenderedImage source,
ImageLayout layout,
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.
computeImage
protected void computeImage(Raster[] sources,
WritableRaster dest,
Rectangle destRect)
- Computes the whole image.
- Specified by:
computeImage
in class UntiledOpImage
Copyright © 1996-2010 Geotools. All Rights Reserved.