Package gov.nih.mipav.model.algorithms

Class AlgorithmBarrelDistortion

java.lang.Object

java.lang.Thread

gov.nih.mipav.model.algorithms.AlgorithmBase

gov.nih.mipav.model.algorithms.AlgorithmBarrelDistortion

All Implemented Interfaces:

java.awt.event.ActionListener, java.awt.event.WindowListener, java.lang.Runnable, java.util.EventListener

public class AlgorithmBarrelDistortion
extends AlgorithmBase

Corrects barrel and/or pin cushion distortion for 2D images. rsrc = a * rdest**4 + b * rdest**3 + c * rdest**2 + d * rdest rsrc and rdest are specified in units of the min((xDim-1)/2, (yDim-1)/2) Reference 1.) Correcting Barrel Distortion by Helmut Dersch at http://www.all-in-one.ee/~dersch/barrel/barrel.html Quoting from this reference: How to determine suitable Parameters: The correcting function is a third order polynomial. It relates the distance of a pixel from the center of the source image (rsrc) to the corresponding distance in the corrected image (rdest) : rsrc = ( a * rdest3 + b * rdest2 + c * rdest + d ) * rdest The parameter d describes the linear scaling of the image. Using d=1, and a=b=c=0 leaves the image as it is. Choosing other d-values scales the image by that amount. a,b and c distort the image. Using negative values shifts distant points away from the center. This counteracts barrel distortion, and is the basis for the above corrections. Using positive values shifts distant points towards the center. This counteracts pincussion distortions. Correcting using 'a' affects only the outermost pixels of the image, while 'b' correction is more uniform. Finally, you may correct pincussion and barrel distortions in the same image: If the outer regions exhibit barrel distortions, and the inner parts pincussion, you should use negative 'a' and positive 'b' values. If you do not want to scale the image, you should set d so that a +b + c + d = 1. In most cases, you will get quite satisfactory results by using just one parameter, like the 'b'-parameter in the above examples. These examples may also serve as a guide to how large these values should be, ie around 0.1 if the distortion is quite visible, or around 0.01 if it is very small. Simply optimize this starting value until you like your image. Reference 2.) Lens correction model by From PanoTools.org Wiki at http://wiki.panotools.org/Lens_correction_model Quoting from this reference: Usual values for a, b, and c are below 1.0, in most cases below 0.01. The a and c parameters control more complex forms of distortion. In most cases it will be enough to optimize for the b parameter only, which is good at correcting normal barrel distortion and pincushion distortion.

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Thread

java.lang.Thread.State, java.lang.Thread.UncaughtExceptionHandler

Field Summary

Fields

Modifier and Type	Field	Description
private float	a	DOCUMENT ME!
private float	b	DOCUMENT ME!
private float	c
private float	d

Fields inherited from class gov.nih.mipav.model.algorithms.AlgorithmBase

destFlag, destImage, image25D, mask, maxProgressValue, minProgressValue, multiThreadingEnabled, nthreads, progress, progressModulus, progressStep, runningInSeparateThread, separable, srcImage, threadStopped

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Constructor Summary

Constructors

Constructor	Description
AlgorithmBarrelDistortion()	AlgorithmBarrelDistortion - default constructor.
AlgorithmBarrelDistortion(ModelImage destImg, ModelImage srcImg, float a, float b, float c, float d)	AlgorithmBarrelDistortion.

Method Summary

Modifier and Type	Method	Description
void	finalize()	finalize -
void	runAlgorithm()	Starts the program.

Methods inherited from class gov.nih.mipav.model.algorithms.AlgorithmBase

actionPerformed, addListener, addProgressChangeListener, calculateImageSize, calculatePrincipleAxis, computeElapsedTime, computeElapsedTime, convertIntoFloat, delinkProgressToAlgorithm, delinkProgressToAlgorithmMulti, displayError, errorCleanUp, fireProgressStateChanged, fireProgressStateChanged, fireProgressStateChanged, fireProgressStateChanged, fireProgressStateChanged, generateProgressValues, getDestImage, getElapsedTime, getMask, getMaxProgressValue, getMinProgressValue, getNumberOfThreads, getProgress, getProgressChangeListener, getProgressChangeListeners, getProgressModulus, getProgressStep, getProgressValues, getSrcImage, isCompleted, isImage25D, isMultiThreadingEnabled, isRunningInSeparateThread, isThreadStopped, linkProgressToAlgorithm, linkProgressToAlgorithm, makeProgress, notifyListeners, removeListener, removeProgressChangeListener, run, setCompleted, setImage25D, setMask, setMaxProgressValue, setMinProgressValue, setMultiThreadingEnabled, setNumberOfThreads, setProgress, setProgressModulus, setProgressStep, setProgressValues, setProgressValues, setRunningInSeparateThread, setSrcImage, setStartTime, setThreadStopped, startMethod, windowActivated, windowClosed, windowClosing, windowDeactivated, windowDeiconified, windowIconified, windowOpened

Methods inherited from class java.lang.Thread

activeCount, checkAccess, clone, countStackFrames, currentThread, dumpStack, enumerate, getAllStackTraces, getContextClassLoader, getDefaultUncaughtExceptionHandler, getId, getName, getPriority, getStackTrace, getState, getThreadGroup, getUncaughtExceptionHandler, holdsLock, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, onSpinWait, resume, setContextClassLoader, setDaemon, setDefaultUncaughtExceptionHandler, setName, setPriority, setUncaughtExceptionHandler, sleep, sleep, start, stop, suspend, toString, yield

Methods inherited from class java.lang.Object

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

Field Detail

a

private float a

DOCUMENT ME!

b

private float b

DOCUMENT ME!

c

private float c

d

private float d

Constructor Detail

AlgorithmBarrelDistortion

public AlgorithmBarrelDistortion()

AlgorithmBarrelDistortion - default constructor.

AlgorithmBarrelDistortion

public AlgorithmBarrelDistortion(ModelImage destImg,
                                 ModelImage srcImg,
                                 float a,
                                 float b,
                                 float c,
                                 float d)

AlgorithmBarrelDistortion.

Parameters:

destImg - DOCUMENT ME!

srcImg - DOCUMENT ME!

a -

b -

c -

d -

Method Detail

finalize

public void finalize()

finalize -

Overrides:

finalize in class AlgorithmBase

runAlgorithm

public void runAlgorithm()

Starts the program.

Specified by:

runAlgorithm in class AlgorithmBase