C# Class AForge.Imaging.Filters.AdaptiveSmoothing

Adaptive Smoothing - noise removal with edges preserving.

The filter is aimed to perform image smoothing, but keeping sharp edges. This makes it applicable to additive noise removal and smoothing objects' interiors, but not applicable for spikes (salt and pepper noise) removal.

The next calculations are done for each pixel: weights are calculate for 9 pixels - pixel itself and 8 neighbors: w(x, y) = exp( -1 * (Gx^2 + Gy^2) / (2 * factor^2) ) Gx(x, y) = (I(x + 1, y) - I(x - 1, y)) / 2 Gy(x, y) = (I(x, y + 1) - I(x, y - 1)) / 2 , where factor is a configurable value determining smoothing's quality. sum of 9 weights is calclated (weightTotal); sum of 9 weighted pixel values is calculatd (total); destination pixel is calculated as total / weightTotal.

Description of the filter was found in "An Edge Detection Technique Using the Facet Model and Parameterized Relaxation Labeling" by Ioannis Matalas, Student Member, IEEE, Ralph Benjamin, and Richard Kitney.

The filter accepts 8 bpp grayscale images and 24 bpp color images for processing.

Sample usage:

 // create filter AdaptiveSmoothing filter = new AdaptiveSmoothing( ); // apply the filter filter.ApplyInPlace( image );

Initial image:

Result image:

Inheritance: BaseUsingCopyPartialFilter

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Public Methods

Method	Description
AdaptiveSmoothing ( ) : System	Initializes a new instance of the AdaptiveSmoothing class.
AdaptiveSmoothing ( double factor ) : System	Initializes a new instance of the AdaptiveSmoothing class.

Protected Methods

Method	Description
ProcessFilter ( UnmanagedImage source, UnmanagedImage destination, Rectangle rect ) : void	Process the filter on the specified image.

Method Details

AdaptiveSmoothing() public method

Initializes a new instance of the AdaptiveSmoothing class.

public AdaptiveSmoothing ( ) : System
return	System

AdaptiveSmoothing() public method

Initializes a new instance of the AdaptiveSmoothing class.

public AdaptiveSmoothing ( double factor ) : System
factor	double	Factor value.
return	System

ProcessFilter() protected method

Process the filter on the specified image.

protected ProcessFilter ( UnmanagedImage source, UnmanagedImage destination, Rectangle rect ) : void
source	UnmanagedImage	Source image data.
destination	UnmanagedImage	Destination image data.
rect	System.Drawing.Rectangle	Image rectangle for processing by the filter.
return	void