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RLysaker4thOrderFilter Class Reference

#include <RLysaker4thOrderFilter.hpp>

Inheritance diagram for RLysaker4thOrderFilter:

[legend]Collaboration diagram for RLysaker4thOrderFilter:

[legend]List of all members.

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Detailed Description

Lysaker 4th Order TV restoration filter.

Author:

Bernard De Cuyper

Version:

0.06

Date:

10/08/2002

 
Purpose:        Better preservation of details in  TV norme restoration.

Paper:          "Noise Removal using Fourth-Order Partial
                        Differential Equations with Applications to
                        Medical Magnetic Resonance Images in Space and time.", 
                        Marius Lysaker & Arvid Lundervold , Report 2002, UCLA.

Purpose:        Second order filter like the Rudin/Osher/Fatemi filter are very
            good denoiser. But is some application, to much details are destroyed.
                        Also, second order filters introduce a staircase effect in images.
                        (like linear steps). Higher order filters can better maintain 
                        non-linear information and details, this happens at the cost of
                        maintaining some noise. This is a tradeoff, your choice, or perhaps
                        we may need a kind of "linearity" indicator to decide what type of local restoration
                        should be used.
                

@ Copyrights: Bernard De Cuyper & Eddy Fraiha 2002, Eggs & Pictures. MIT/Open BSD copyright model.

Public Methods
	RLysaker4thOrderFilter (int n, double rdt=0.1)
virtual	~RLysaker4thOrderFilter ()
virtual void	setMask (int n, int *xp, int *yp)
virtual RImage *	filter (RImage *src, RImage *dest=0)
	Local full image filtering.
virtual RImage *	selectedFilter (AnImage *mask, RImage *src, RImage *dest=0)
	Local filtering in a mask area.
virtual void	report (FILE *file)
Protected Methods
virtual void	channelConstrain ()
virtual void	channelConstrain (AnImage &mask)
virtual double	operation (RImage *im, int x, int y)
virtual void	operations (RImage *result)
virtual void	operations (AnImage &mask, RImage *result)
Protected Attributes
RImage *	u0
RImage *	u
RImage *	ux
RImage *	uy
RImage *	aDUxx
RImage *	bDUyy
RImage *	deltaU
double	lambda
double	sigma2
double	epsilon
double	sumI0_2
int	niterations
double	dt

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Member Function Documentation

RImage * RLysaker4thOrderFilter::filter (  RImage *    src, RImage *    dest = 0 )  [virtual]

Local full image filtering. Parameters: src  is RImage* is RImage source channel dest  is RImage* is RImage result/placeholder Returns : RImage* as result, Implements AbsRImageFilter.

RImage * RLysaker4thOrderFilter::selectedFilter (  AnImage *    mask, RImage *    src, RImage *    dest = 0 )  [virtual]

Local filtering in a mask area. Parameters: mask  is AnImage* is a ByteImage src  is RImage* is RImage source channel dest  is RImage* is RImage result/placeholder Returns : RImage* as result, Reimplemented from AbsRImageFilter.

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The documentation for this class was generated from the following files:

• RLysaker4thOrderFilter.hpp
• RLysaker4thOrderFilter.cpp

Restoreinpaint sourceforge project `C++/Java Image Processing, Restoration, Inpainting Project'.

Bernard De Cuyper: Open Project Leader: Concept, design and development. Bernard De Cuyper & Eddy Fraiha 2002, 2003. Bernard De Cuyper 2004. Open and free, for friendly usage only. Modifications on Belgium ground of this piece of artistic work, by governement institutions or companies, must be notified to Bernard De Cuyper.