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| java.lang.Object
 java.awt.image.ConvolveOp
| ConvolveOp | | public class ConvolveOp implements BufferedImageOp,RasterOp(Code) | | This class implements a convolution from the source
to the destination.
Convolution using a convolution kernel is a spatial operation that
computes the output pixel from an input pixel by multiplying the kernel
with the surround of the input pixel.
This allows the output pixel to be affected by the immediate neighborhood
in a way that can be mathematically specified with a kernel.
This class operates with BufferedImage data in which color components are
premultiplied with the alpha component. If the Source BufferedImage has
an alpha component, and the color components are not premultiplied with
the alpha component, then the data are premultiplied before being
convolved. If the Destination has color components which are not
premultiplied, then alpha is divided out before storing into the
Destination (if alpha is 0, the color components are set to 0). If the
Destination has no alpha component, then the resulting alpha is discarded
after first dividing it out of the color components.
Rasters are treated as having no alpha channel. If the above treatment
of the alpha channel in BufferedImages is not desired, it may be avoided
by getting the Raster of a source BufferedImage and using the filter method
of this class which works with Rasters.
If a RenderingHints object is specified in the constructor, the
color rendering hint and the dithering hint may be used when color
conversion is required.
Note that the Source and the Destination may not be the same object.
version:
10 Feb 1997
See Also: Kernel
See Also: java.awt.RenderingHints.KEY_COLOR_RENDERING
See Also: java.awt.RenderingHints.KEY_DITHERING |
| Constructor Summary | |
| public | ConvolveOp(Kernel kernel, int edgeCondition, RenderingHints hints)
Constructs a ConvolveOp given a Kernel, an edge condition, and a
RenderingHints object (which may be null). | | public | ConvolveOp(Kernel kernel)
Constructs a ConvolveOp given a Kernel. |
| EDGE_NO_OP | | final public static int EDGE_NO_OP(Code) | | Pixels at the edge of the source image are copied to
the corresponding pixels in the destination without modification.
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| EDGE_ZERO_FILL | | final public static int EDGE_ZERO_FILL(Code) | | Pixels at the edge of the destination image are set to zero. This
is the default.
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| ConvolveOp | | public ConvolveOp(Kernel kernel)(Code) | | Constructs a ConvolveOp given a Kernel. The edge condition
will be EDGE_ZERO_FILL.
Parameters:
kernel - the specified Kernel
See Also: Kernel
See Also: ConvolveOp.EDGE_ZERO_FILL |
| createCompatibleDestImage | | public BufferedImage createCompatibleDestImage(BufferedImage src, ColorModel destCM)(Code) | | Creates a zeroed destination image with the correct size and number
of bands. If destCM is null, an appropriate ColorModel will be used.
Parameters:
src - Source image for the filter operation.
Parameters:
destCM - ColorModel of the destination. Can be null. a destination BufferedImage with the correctsize and number of bands. |
| createCompatibleDestRaster | | public WritableRaster createCompatibleDestRaster(Raster src)(Code) | | Creates a zeroed destination Raster with the correct size and number
of bands, given this source.
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| filter | | final public BufferedImage filter(BufferedImage src, BufferedImage dst)(Code) | | Performs a convolution on BufferedImages. Each component of the
source image will be convolved (including the alpha component, if
present).
If the color model in the source image is not the same as that
in the destination image, the pixels will be converted
in the destination. If the destination image is null,
a BufferedImage will be created with the source ColorModel.
The IllegalArgumentException may be thrown if the source is the
same as the destination.
Parameters:
src - the source BufferedImage to filter
Parameters:
dst - the destination BufferedImage for the filtered src the filtered BufferedImage
throws:
NullPointerException - if src is null
throws:
IllegalArgumentException - if src equalsdst
throws:
ImagingOpException - if src cannot be filtered |
| filter | | final public WritableRaster filter(Raster src, WritableRaster dst)(Code) | | Performs a convolution on Rasters. Each band of the source Raster
will be convolved.
The source and destination must have the same number of bands.
If the destination Raster is null, a new Raster will be created.
The IllegalArgumentException may be thrown if the source is
the same as the destination.
Parameters:
src - the source Raster to filter
Parameters:
dst - the destination WritableRaster for the filtered src the filtered WritableRaster
throws:
NullPointerException - if src is null
throws:
ImagingOpException - if src and dstdo not have the same number of bands
throws:
ImagingOpException - if src cannot be filtered
throws:
IllegalArgumentException - if src equals dst |
| getBounds2D | | final public Rectangle2D getBounds2D(BufferedImage src)(Code) | | Returns the bounding box of the filtered destination image. Since
this is not a geometric operation, the bounding box does not
change.
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| getBounds2D | | final public Rectangle2D getBounds2D(Raster src)(Code) | | Returns the bounding box of the filtered destination Raster. Since
this is not a geometric operation, the bounding box does not
change.
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| getKernel | | final public Kernel getKernel()(Code) | | Returns the Kernel.
the Kernel of this ConvolveOp. |
| getPoint2D | | final public Point2D getPoint2D(Point2D srcPt, Point2D dstPt)(Code) | | Returns the location of the destination point given a
point in the source. If dstPt is non-null, it will
be used to hold the return value. Since this is not a geometric
operation, the srcPt will equal the dstPt.
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| getRenderingHints | | final public RenderingHints getRenderingHints()(Code) | | Returns the rendering hints for this op.
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