SPATMOD::IMAGE::FILTER_FOCAL_LEE Class Reference

The Lee filter uses a least-squares approach to estimate the true signal strength of the center cell in the filter window from the measured value in that cell, the local mean brightness of all cells in the window, and a gain factor calculated from the local variance and the noise standard deviation. More...

#include <spatmod/imagefilterfocal.h>

Inheritance diagram for SPATMOD::IMAGE::FILTER_FOCAL_LEE:

[legend]

List of all members.

Public Member Functions
	FILTER_FOCAL_LEE (STAGE *pSourceImage, bool TakeOwnershipSource, STAGE *pMaskImage, bool TakeOwnershipMask, UINT32 NumFocalRows, UINT32 NumFocalColumns, double AmountFilterPct=100.0)
	FILTER_FOCAL_LEE (STAGE *pSourceImage, bool TakeOwnershipSource, UINT32 NumFocalRows, UINT32 NumFocalColumns, double AmountFilterPct=100.0)
virtual	~FILTER_FOCAL_LEE ()

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Detailed Description

The Lee filter uses a least-squares approach to estimate the true signal strength of the center cell in the filter window from the measured value in that cell, the local mean brightness of all cells in the window, and a gain factor calculated from the local variance and the noise standard deviation.

The filter assumes a Gaussian (normal) distribution for the noise values, and calculates the local noise standard deviation for each filter window. The Lee filter calculation produces an output value close to the local mean for uniform areas, and a value close to the original input value in higher contrast regions. Most smoothing occurs in the more uniform areas, while edges and other fine detail is maintained.

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Constructor & Destructor Documentation

SPATMOD::IMAGE::FILTER_FOCAL_LEE::FILTER_FOCAL_LEE	(	STAGE *	pSourceImage,
		bool	TakeOwnershipSource,
		UINT32	NumFocalRows,
		UINT32	NumFocalColumns,
		double	AmountFilterPct = 100.0
	)

Constructor.

Parameters:

	pSourceImage	Source image stage
	TakeOwnershipSource	Filter takes ownership of source image
	NumFocalRows	Number of rows in processing window
	NumFocalColumns	Number of columns in processing window
	AmountFilterPct	Amount of filter to apply (percentage, 0-100)

SPATMOD::IMAGE::FILTER_FOCAL_LEE::FILTER_FOCAL_LEE	(	STAGE *	pSourceImage,
		bool	TakeOwnershipSource,
		STAGE *	pMaskImage,
		bool	TakeOwnershipMask,
		UINT32	NumFocalRows,
		UINT32	NumFocalColumns,
		double	AmountFilterPct = 100.0
	)

Constructor with mask to determine areas to filter.

Parameters:

	pSourceImage	Source image stage
	TakeOwnershipSource	Filter takes ownership of source image
	pMaskImage	Mask, must have single component sample
	TakeOwnershipMask	Filter takes ownership of mask stage and will delete when needed
	NumFocalRows	Number of rows in processing window
	NumFocalColumns	Number of columns in processing window
	AmountFilterPct	Amount of filter to apply (percentage, 0-100)

virtual SPATMOD::IMAGE::FILTER_FOCAL_LEE::~FILTER_FOCAL_LEE

(

)

[virtual]

Destructor.

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

• spatmod/imagefilterfocal.h