C# Class AForge.Imaging.Filters.HorizontalRunLengthSmoothing

Horizontal run length smoothing algorithm.

The class implements horizontal run length smoothing algorithm, which is described in: K.Y. Wong, R.G. Casey and F.M. Wahl, "Document analysis system," IBM J. Res. Devel., Vol. 26, NO. 6,111). 647-656, 1982.

Unlike the original description of this algorithm, this implementation must be applied to inverted binary images containing document, i.e. white text on black background. So this implementation fills horizontal black gaps between white pixels.

This algorithm is usually used together with VerticalRunLengthSmoothing, Intersect and then further analysis of white blobs.

The filter accepts 8 bpp grayscale images, which are supposed to be binary inverted documents.

Sample usage:

 // create filter HorizontalRunLengthSmoothing hrls = new HorizontalRunLengthSmoothing( 32 ); // apply the filter hrls.ApplyInPlace( image );

Source image:

Result image:

Inheritance: BaseInPlacePartialFilter

Show file Open project: holisticware-admin/MonoVersal.AForgeNET

Public Methods

Method	Description
HorizontalRunLengthSmoothing ( ) : System	Initializes a new instance of the HorizontalRunLengthSmoothing class.
HorizontalRunLengthSmoothing ( int maxGapSize ) : System	Initializes a new instance of the HorizontalRunLengthSmoothing class.

Protected Methods

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

Method Details

HorizontalRunLengthSmoothing() public method

Initializes a new instance of the HorizontalRunLengthSmoothing class.

public HorizontalRunLengthSmoothing ( ) : System
return	System

HorizontalRunLengthSmoothing() public method

Initializes a new instance of the HorizontalRunLengthSmoothing class.

public HorizontalRunLengthSmoothing ( int maxGapSize ) : System
maxGapSize	int	Maximum gap size to fill (see ).
return	System

ProcessFilter() protected method

Process the filter on the specified image.

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