jigl.image.utils
Class DifferentialGeometry

java.lang.Object
  |
  +--jigl.image.utils.DifferentialGeometry

public class DifferentialGeometry

extends Object

This class performs various differential geometry operations on an image. It calculates only as needed and then stores the results into various internal images. For example, if an operation needs the first derivative calculated, then it will store the result internally for use later on.

Field Summary

private RealGrayImage	GradientMagnitude A image stores the gradient magnitude (steep) at each pixel.
protected RealGrayImage	image Original image
private RealGrayImage	IsophoteCurvature A image stores the curvature at each pixel.
private RealGrayImage	IsophoteCurvatureFlow A image stores the isophote curvature at each pixel.
private RealGrayImage	IxImage First derivative in the x direction.
private RealGrayImage	IxxImage Second derivative in the x direction.
private RealGrayImage	IxyImage second derivative in the xy direction
private RealGrayImage	IyImage First derivative in the y direction.
private RealGrayImage	IyyImage Second derivative in the y direction.
private RealGrayImage	OrientationMap A image stores the gradient phase at each pixel.

Constructor Summary

DifferentialGeometry(RealGrayImage grimage)
This constructor takes a RealGrayImage and stores a shallow copy (If you change the image that is passed it will change the stored image)

Method Summary

(package private) RealGrayImage	ApproximateGradientMagnitude() An approximate way to calculate the magnitude part of gradient.
RealGrayImage	calcIsophoteFlowOnce() This method caluculates the Isophote of a RealGrayImage.
RealGrayImage	calcIsophoteFlowStore() Calculate isophote flow of current image.
RealGrayImage	calcIsophoteOnce() This method caluculates the Isophote of a RealGrayImage.
RealGrayImage	calcIsophoteStore() This function calculates the Isophote of a RealGrayImage.
RealGrayImage	calcIx() Calculates Ix (first derivative in the x direction) of the image.
RealGrayImage	calcIxx() Calculate Ixx (second derivative in the x direction) of the image.
RealGrayImage	calcIxy() Calculate Ixy (second derivative in the xy direction) of the image.
RealGrayImage	calcIy() Calculate Iy (first derivative in the y direction) of the image.
RealGrayImage	calcIyy() Calculate Iyy (second derivative in the y direction) of the image.
RealGrayImage	getIx() Returns Ix (first derivative in the x direction) of the image.
RealGrayImage	getIxx() Returns Ixx (second derivative in the x direction) of the image.
RealGrayImage	getIxy() Returns Ixy (second derivative in the xy direction) of the image.
RealGrayImage	getIy() Returns Iy (first derivative in the y direction) of the image.
RealGrayImage	getIyy() Returns Iyy (second derivative in the y direction) of the image.
(package private) RealGrayImage	GradientMagnitude() Calculate the magnitude part of the gradient.
(package private) RealGrayImage	OrientationMap() Calculate the pahse part of gradient.

Methods inherited from class java.lang.Object

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

Field Detail

image

protected RealGrayImage image

Original image

IxImage

private RealGrayImage IxImage

First derivative in the x direction.

IyImage

private RealGrayImage IyImage

First derivative in the y direction.

IxxImage

private RealGrayImage IxxImage

Second derivative in the x direction.

IyyImage

private RealGrayImage IyyImage

Second derivative in the y direction.

IxyImage

private RealGrayImage IxyImage

second derivative in the xy direction

GradientMagnitude

private RealGrayImage GradientMagnitude

A image stores the gradient magnitude (steep) at each pixel.

IsophoteCurvature

private RealGrayImage IsophoteCurvature

A image stores the curvature at each pixel.

IsophoteCurvatureFlow

private RealGrayImage IsophoteCurvatureFlow

A image stores the isophote curvature at each pixel.

OrientationMap

private RealGrayImage OrientationMap

A image stores the gradient phase at each pixel.

Constructor Detail

DifferentialGeometry

public DifferentialGeometry(RealGrayImage grimage)

This constructor takes a RealGrayImage and stores a shallow copy (If you change the image that is passed it will change the stored image)

Method Detail

getIx

public RealGrayImage getIx()

Returns Ix (first derivative in the x direction) of the image. If it has not been previously calculated this function will return null.

getIy

public RealGrayImage getIy()

Returns Iy (first derivative in the y direction) of the image. If it has not been previously calculated this function will return null.

getIxx

public RealGrayImage getIxx()

Returns Ixx (second derivative in the x direction) of the image. If it has not been previously calculated this function will return null.

getIyy

public RealGrayImage getIyy()

Returns Iyy (second derivative in the y direction) of the image. If it has not been previously calculated this function will return null.

getIxy

public RealGrayImage getIxy()

Returns Ixy (second derivative in the xy direction) of the image. If it has not been previously calculated this function will return null.

calcIx

public RealGrayImage calcIx()
                     throws ImageNotSupportedException

Calculates Ix (first derivative in the x direction) of the image. Stores a copy of returned image which can be accessed through getIx()

ImageNotSupportedException

calcIy

public RealGrayImage calcIy()
                     throws ImageNotSupportedException

Calculate Iy (first derivative in the y direction) of the image. Stores a copy of returned image which can be accessed through getIy()

ImageNotSupportedException

calcIxx

public RealGrayImage calcIxx()
                      throws ImageNotSupportedException

Calculate Ixx (second derivative in the x direction) of the image. Stores a copy of returned image which can be accessed through getIxx()

ImageNotSupportedException

calcIyy

public RealGrayImage calcIyy()
                      throws ImageNotSupportedException

Calculate Iyy (second derivative in the y direction) of the image. Stores a copy of returned image which can be accessed through getIyy()

ImageNotSupportedException

calcIxy

public RealGrayImage calcIxy()
                      throws ImageNotSupportedException

Calculate Ixy (second derivative in the xy direction) of the image. Stores a copy of returned image which can be accessed through getIxy()

ImageNotSupportedException

calcIsophoteStore

public RealGrayImage calcIsophoteStore()
                                throws ImageNotSupportedException

This function calculates the Isophote of a RealGrayImage. If Ix, Iy, Ixx, Ixy, or Iyy had been previously been calculated, it will use them.

ImageNotSupportedException

calcIsophoteOnce

public RealGrayImage calcIsophoteOnce()

This method caluculates the Isophote of a RealGrayImage. This function is less memory floatensive than calcIsophoteStore

calcIsophoteFlowStore

public RealGrayImage calcIsophoteFlowStore()
                                    throws ImageNotSupportedException

Calculate isophote flow of current image.

ImageNotSupportedException

calcIsophoteFlowOnce

public RealGrayImage calcIsophoteFlowOnce()

This method caluculates the Isophote of a RealGrayImage. This function is less memory floatensive than calcIsophoteStore.

GradientMagnitude

RealGrayImage GradientMagnitude()
                          throws ImageNotSupportedException

Calculate the magnitude part of the gradient.

ImageNotSupportedException

ApproximateGradientMagnitude

RealGrayImage ApproximateGradientMagnitude()
                                     throws ImageNotSupportedException

An approximate way to calculate the magnitude part of gradient.

ImageNotSupportedException

OrientationMap

RealGrayImage OrientationMap()
                       throws ImageNotSupportedException

Calculate the pahse part of gradient.

ImageNotSupportedException