VolumeJ
Class VJProjection

java.lang.Object
  |
  +--VolumeJ.VJProjection

public class VJProjection

extends java.lang.Object

This class is a set of projections of an object. Its properties are the projections (as images) and the projection angles of each image. It belongs to the BackProjection group of algorithms. Copyright (c) 1999-2002, Michael Abramoff. All rights reserved.

Field Summary

protected int	n The number of projection images.
protected java.lang.Object[]	sliceArray The projection images.
protected int	sliceHeight
protected int	sliceWidth The width of each projection image.
protected float[]	theta Angle (in degrees) of each projection image.
protected int	type

Constructor Summary

VJProjection(double deltaAngle, java.lang.Object[] sliceArray, int n, int width, int height)
Create a new projection.

Method Summary

void	backproject(Volume v) Backprojection around a single axis y.
protected void	buildAngles(double deltaAngle, int n) Compute the angle of each projection image for a sequence of equidistant projection images.
int	getHeight() Return the height of the images in sliceArray.
java.lang.Object[]	getImageArray() Return the slice array this back projection is based on.
protected int	getType(java.lang.Object[] array) Return the datatype of the array components.
int	getWidth() Return the width of the images in sliceArray.
int	n() Return the number of projection images in this projection.

Methods inherited from class java.lang.Object

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

Field Detail

type

protected int type

theta

protected float[] theta

Angle (in degrees) of each projection image.

sliceArray

protected java.lang.Object[] sliceArray

The projection images.

n

protected int n

The number of projection images.

sliceWidth

protected int sliceWidth

The width of each projection image.

sliceHeight

protected int sliceHeight

Constructor Detail

VJProjection

public VJProjection(double deltaAngle,
                    java.lang.Object[] sliceArray,
                    int n,
                    int width,
                    int height)

Create a new projection.

Parameters:

deltaAngle - the distance in degrees between each projection image.

sliceArray - an array of Object-s with in each object a byte, short or int image.

n - the number of projection images in sliceArray.

width - the width of each projection image in sliceArray.

Method Detail

getImageArray

public java.lang.Object[] getImageArray()

Return the slice array this back projection is based on. Can be used for pre-filtering the projection images.

Returns:

the sliceArray as an Object.

getWidth

public int getWidth()

Return the width of the images in sliceArray.

Returns:

an int with the width.

getHeight

public int getHeight()

Return the height of the images in sliceArray.

Returns:

an int with the width.

getType

protected int getType(java.lang.Object[] array)

Return the datatype of the array components.

Parameters:

array - an array of objects.

Returns:

BYTE if array is of type byte[], SHORT if array is of type short[], INT if array is of type int[] and FLOAt if array is of type float[].

buildAngles

protected void buildAngles(double deltaAngle,
                           int n)

Compute the angle of each projection image for a sequence of equidistant projection images.

Parameters:

deltaAngle - the distance between each projectioon image in degrees.

n - the number of projection images.

n

public int n()

Return the number of projection images in this projection.

backproject

public void backproject(Volume v)

Backprojection around a single axis y. This is the inverse of tha Radon transform. Backproject each projection image into the volume.

Parameters:

v - a VolumeFloat that has the right size to be filled with the backprojection.