com.jhlabs.image
Class GaussianFilter

java.lang.Object
  com.jhlabs.image.AbstractBufferedImageOp
      com.jhlabs.image.ConvolveFilter
          com.jhlabs.image.GaussianFilter

All Implemented Interfaces:

BufferedImageOp, Cloneable

Direct Known Subclasses:

GlowFilter, HighPassFilter, UnsharpFilter

public class GaussianFilter
extends ConvolveFilter

A filter which applies Gaussian blur to an image. This is a subclass of ConvolveFilter which simply creates a kernel with a Gaussian distribution for blurring.

Author:

Jerry Huxtable

Field Summary

protected Kernel	kernel The convolution kernel.
protected float	radius The blur radius.

Fields inherited from class com.jhlabs.image.ConvolveFilter

alpha, CLAMP_EDGES, premultiplyAlpha, WRAP_EDGES, ZERO_EDGES

Constructor Summary

GaussianFilter()
Construct a Gaussian filter.

GaussianFilter(float radius)
Construct a Gaussian filter.

Method Summary

static void	convolveAndTranspose(Kernel kernel, int[] inPixels, int[] outPixels, int width, int height, boolean alpha, boolean premultiply, boolean unpremultiply, int edgeAction) Blur and transpose a block of ARGB pixels.
BufferedImage	filter(BufferedImage src, BufferedImage dst)
float	getRadius() Get the radius of the kernel.
static Kernel	makeKernel(float radius) Make a Gaussian blur kernel.
void	setRadius(float radius) Set the radius of the kernel, and hence the amount of blur.
String	toString()

Methods inherited from class com.jhlabs.image.ConvolveFilter

convolve, convolve, convolveH, convolveHV, convolveV, createCompatibleDestImage, getBounds2D, getEdgeAction, getKernel, getPoint2D, getPremultiplyAlpha, getRenderingHints, getUseAlpha, setEdgeAction, setKernel, setPremultiplyAlpha, setUseAlpha

Methods inherited from class com.jhlabs.image.AbstractBufferedImageOp

clone, getRGB, setRGB

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

radius

protected float radius

The blur radius.

kernel

protected Kernel kernel

The convolution kernel.

Constructor Detail

GaussianFilter

public GaussianFilter()

Construct a Gaussian filter.

GaussianFilter

public GaussianFilter(float radius)

Construct a Gaussian filter.

Parameters:

radius - blur radius in pixels

Method Detail

setRadius

public void setRadius(float radius)

Set the radius of the kernel, and hence the amount of blur. The bigger the radius, the longer this filter will take.

Parameters:

radius - the radius of the blur in pixels.

See Also:

getRadius()

getRadius

public float getRadius()

Get the radius of the kernel.

Returns:

the radius

See Also:

setRadius(float)

filter

public BufferedImage filter(BufferedImage src,
                            BufferedImage dst)

Specified by:

filter in interface BufferedImageOp

Overrides:

filter in class ConvolveFilter

convolveAndTranspose

public static void convolveAndTranspose(Kernel kernel,
                                        int[] inPixels,
                                        int[] outPixels,
                                        int width,
                                        int height,
                                        boolean alpha,
                                        boolean premultiply,
                                        boolean unpremultiply,
                                        int edgeAction)

Blur and transpose a block of ARGB pixels.

Parameters:

kernel - the blur kernel

inPixels - the input pixels

outPixels - the output pixels

width - the width of the pixel array

height - the height of the pixel array

alpha - whether to blur the alpha channel

edgeAction - what to do at the edges

makeKernel

public static Kernel makeKernel(float radius)

Make a Gaussian blur kernel.

Parameters:

radius - the blur radius

Returns:

the kernel

toString

public String toString()

Overrides:

toString in class ConvolveFilter