C# Class AForge.Imaging.Filters.VerticalRunLengthSmoothing

Vertical run length smoothing algorithm.

The class implements vertical 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 vertical black gaps between white pixels.

This algorithm is usually used together with HorizontalRunLengthSmoothing, 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 VerticalRunLengthSmoothing vrls = new VerticalRunLengthSmoothing( 32 ); // apply the filter vrls.ApplyInPlace( image );

Source image:

Result image:

Inheritance: BaseInPlacePartialFilter

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Public Methods

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

Protected Methods

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

Method Details

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

VerticalRunLengthSmoothing() public method

Initializes a new instance of the VerticalRunLengthSmoothing class.

public VerticalRunLengthSmoothing ( ) : System
return	System

VerticalRunLengthSmoothing() public method

Initializes a new instance of the VerticalRunLengthSmoothing class.

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