de.lmu.ifi.dbs.jfeaturelib.utils

Class GeometricBlur

java.lang.Object

de.lmu.ifi.dbs.jfeaturelib.utils.GeometricBlur

public class GeometricBlur
extends Object

Gaussian Blur where sigma is modified according to spacial position to the "query point". Can be used as a component for geometric blur. Geom.blur first separates the input image into 4 channels of half-wave rectified responses from oriented edge filters. The idea was proposed by Alexander Berg: http://acberg.com/gb.html Relevant papers: Shape Matching and Object Recognition using Low Distortion Correspondence Alexander C. Berg, Tamara L. Berg, Jitendra Malik IEEE Computer Vision and Pattern Recognition (CVPR) 2005 (Presents a descriptor based on geometric blur and applies this to object recognition.) Geometric Blur for Template Matching Alexander C. Berg, Jitendra Malik Computer Vision and Pattern Recognition (CVPR) 2001, Hawaii, pp I.607-614 (The original geometric blur paper concentrating on template matching and localization.) Shape Matching and Object Recognition Alexander C. Berg Ph.D. Thesis, Computer Science Division, U.C. Berkeley, December 2005 (Presents more detail on the motivation for geometric blur, study of corresponding image patches, etc.)

Author:

Graf

Constructor Summary

Constructors

Constructor and Description
GeometricBlur()
GeometricBlur(ij.process.ImageProcessor ip, double sig, int steps)

Method Summary

Methods

Modifier and Type	Method and Description
int	getBlursteps()
ij.process.ImageProcessor	getIp()
int	getPixel(ImagePoint q, ImagePoint center) Returns the spacially blurred pixel value at the point q, assuming that center is the source of the blur.
float	getPixelValue(ImagePoint q, ImagePoint center) Returns the spacially blurred pixel value at the point q, assuming that center is the source of the blur.
double	getSigma()
void	paintInto(ij.process.ImageProcessor out, ImagePoint center)
void	setBlursteps(int blursteps)
void	setIp(ij.process.ImageProcessor ip)
void	setSigma(double sigma)

Methods inherited from class java.lang.Object

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

Constructor Detail

GeometricBlur

public GeometricBlur()

GeometricBlur

public GeometricBlur(ij.process.ImageProcessor ip,
             double sig,
             int steps)

Parameters:

ip - image processor of source image

sig - maximum sigma of gauss blur

steps - how many slices of images (with differing sigma) should be created.

Method Detail

paintInto

public void paintInto(ij.process.ImageProcessor out,
             ImagePoint center)

Parameters:

out - write blurred image into this image processor

center - point in the source image being the center of the query

getPixel

public int getPixel(ImagePoint q,
           ImagePoint center)

Returns the spacially blurred pixel value at the point q, assuming that center is the source of the blur.

Parameters:

q - pixel coordinate that should be retrieved

center - the source of the blur

Returns:

pixel value from ImageProcessor.getPixel(int, int)

getPixelValue

public float getPixelValue(ImagePoint q,
                  ImagePoint center)

Returns the spacially blurred pixel value at the point q, assuming that center is the source of the blur.

Parameters:

q - pixel coordante which should be retrieved

center - the source of the blur

Returns:

pixel value from ImageProcessor.getPixelValue(int, int)

getIp

public ij.process.ImageProcessor getIp()

setIp

public void setIp(ij.process.ImageProcessor ip)

getBlursteps

public int getBlursteps()

setBlursteps

public void setBlursteps(int blursteps)

getSigma

public double getSigma()

setSigma

public void setSigma(double sigma)