Catalano.Imaging.Filters

Class VerticalRunLengthSmoothing

java.lang.Object

Catalano.Imaging.Filters.VerticalRunLengthSmoothing

All Implemented Interfaces:

IApplyInPlace

public class VerticalRunLengthSmoothing
extends java.lang.Object
implements IApplyInPlace

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 horizontal black gaps between white pixels.

Constructor Summary

Constructors

Constructor and Description
VerticalRunLengthSmoothing() Initialize a new instance of the VerticalRunLengthSmoothing class.
VerticalRunLengthSmoothing(int maxGapSize) Initialize a new instance of the VerticalRunLengthSmoothing class.
VerticalRunLengthSmoothing(int maxGapSize, boolean processGapsWithImageBorders) Initialize a new instance of the VerticalRunLengthSmoothing class.

Method Summary

Modifier and Type	Method and Description
void	applyInPlace(FastBitmap fastBitmap) Apply filter to an image.
int	getMaxGapSize() Get Maximum gap size to fill (in pixels).
boolean	isProcessGapsWithImageBorders() Verify Process gaps between objects and image borders or not.
void	setMaxGapSize(int maxGapSize) Set Maximum gap size to fill (in pixels).
void	setProcessGapsWithImageBorders(boolean processGapsWithImageBorders) Set Process gaps between objects and image borders or not.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

VerticalRunLengthSmoothing

public VerticalRunLengthSmoothing()

Initialize a new instance of the VerticalRunLengthSmoothing class.

VerticalRunLengthSmoothing

public VerticalRunLengthSmoothing(int maxGapSize)

Initialize a new instance of the VerticalRunLengthSmoothing class.

Parameters:

maxGapSize - Maximum gap size to fill.

VerticalRunLengthSmoothing

public VerticalRunLengthSmoothing(int maxGapSize,
                                  boolean processGapsWithImageBorders)

Initialize a new instance of the VerticalRunLengthSmoothing class.

Parameters:

maxGapSize - Maximum gap size to fill.

processGapsWithImageBorders - Process gaps between objects and image borders or not.

Method Detail

getMaxGapSize

public int getMaxGapSize()

Get Maximum gap size to fill (in pixels). The property specifies maximum horizontal gap between white pixels to fill. If number of black pixels between some white pixels is bigger than this value, then those black pixels are left as is; otherwise the gap is filled with white pixels.

Returns:

Gap size.

setMaxGapSize

public void setMaxGapSize(int maxGapSize)

Set Maximum gap size to fill (in pixels). The property specifies maximum horizontal gap between white pixels to fill. If number of black pixels between some white pixels is bigger than this value, then those black pixels are left as is; otherwise the gap is filled with white pixels.

Parameters:

maxGapSize - Gap size.

isProcessGapsWithImageBorders

public boolean isProcessGapsWithImageBorders()

Verify Process gaps between objects and image borders or not. The property sets if gaps between image borders and objects must be treated as gaps between objects and also filled.

Returns:

True if process

setProcessGapsWithImageBorders

public void setProcessGapsWithImageBorders(boolean processGapsWithImageBorders)

Set Process gaps between objects and image borders or not. The property sets if gaps between image borders and objects must be treated as gaps between objects and also filled.

Parameters:

processGapsWithImageBorders - True of false.

applyInPlace

public void applyInPlace(FastBitmap fastBitmap)

Description copied from interface: IApplyInPlace

Apply filter to an image.

Specified by:

applyInPlace in interface IApplyInPlace

Parameters:

fastBitmap - Image to be processed.