de.lmu.ifi.dbs.jfeaturelib.utils

Class GradientImage

java.lang.Object

de.lmu.ifi.dbs.jfeaturelib.utils.GradientImage

All Implemented Interfaces:

GradientSource

public class GradientImage
extends Object
implements GradientSource

Class that calculates gradients from a given image. The image is convolved with masks (default = sobel) in x and y in order to create the derivates. Afterwards, the gradient orientation and length is computed for each pixel. If the task is just to create a derivation of the image DerivativeImage might be more useful.

Author:

graf

See Also:

DerivativeImage

Constructor Summary

Constructors

Constructor and Description
GradientImage()

Method Summary

Methods

Modifier and Type	Method and Description
int[]	getKernelX()
int[]	getKernelY()
double	getLength(int x, int y) return the length of the gradient vector at the specified position
double	getTheta(int x, int y) Returns the angle of the gradient in the area [0, PI[.
void	setIp(ij.process.ImageProcessor ip) Initialize the GradientSource with this Processor
void	setKernelX(int[] kernelX)
void	setKernelY(int[] kernelY)

Methods inherited from class java.lang.Object

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

Constructor Detail

GradientImage

public GradientImage()

Method Detail

setIp

public void setIp(ij.process.ImageProcessor ip)

Description copied from interface: GradientSource

Initialize the GradientSource with this Processor

Specified by:

setIp in interface GradientSource

getTheta

public double getTheta(int x,
              int y)

Returns the angle of the gradient in the area [0, PI[.

Specified by:

getTheta in interface GradientSource

Parameters:

x - x-cooridnate in pixel space

y - y-cooridnate in pixel space

Returns:

angle of gradient [0,pi[

getLength

public double getLength(int x,
               int y)

return the length of the gradient vector at the specified position

Specified by:

getLength in interface GradientSource

Parameters:

x - x-cooridnate in pixel space

y - y-cooridnate in pixel space

Returns:

length of gradient

getKernelX

public int[] getKernelX()

setKernelX

public void setKernelX(int[] kernelX)

getKernelY

public int[] getKernelY()

setKernelY

public void setKernelY(int[] kernelY)