net.sourceforge.lept4j.util

Class LeptUtils

java.lang.Object

net.sourceforge.lept4j.util.LeptUtils

public class LeptUtils
extends java.lang.Object

Various utility methods for Leptonica.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	SEL_STR2 HMT (with just misses) for speckle up to 2x2
static java.lang.String	SEL_STR3 HMT (with just misses) for speckle up to 3x3

Constructor Summary

Constructors

Constructor and Description
LeptUtils()

Method Summary

Modifier and Type	Method and Description
static Pix	convertImageToPix(java.awt.image.BufferedImage image) Converts BufferedImage to Leptonica Pix .
static java.awt.image.BufferedImage	convertPixToImage(Pix pix) Converts Leptonica Pix to BufferedImage.
static Pix	despeckle(Pix pixs, java.lang.String selStr, int selSize) Reduces speckle noise in image.
static void	dispose(com.sun.jna.Structure resource) Disposes of Leptonica native resource.
static void	disposePix(Pix pix) Disposes of Pix resource.
static Pix	removeLines(Pix pixs) Removes horizontal lines from a grayscale image.

Methods inherited from class java.lang.Object

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

Field Detail

SEL_STR2

public static final java.lang.String SEL_STR2

HMT (with just misses) for speckle up to 2x2

"oooo"
"oC o"
"o  o"
"oooo"

See Also:

Constant Field Values

SEL_STR3

public static final java.lang.String SEL_STR3

HMT (with just misses) for speckle up to 3x3

"ooooo"
"oC  o"
"o   o"
"o   o"
"ooooo"

See Also:

Constant Field Values

Constructor Detail

LeptUtils

public LeptUtils()

Method Detail

convertPixToImage

public static java.awt.image.BufferedImage convertPixToImage(Pix pix)
                                                      throws java.io.IOException

Converts Leptonica Pix to BufferedImage.

Parameters:

pix - source pix

Returns:

BufferedImage output image

Throws:

java.io.IOException

convertImageToPix

public static Pix convertImageToPix(java.awt.image.BufferedImage image)
                             throws java.io.IOException

Converts BufferedImage to Leptonica Pix .

Parameters:

image - source image

Returns:

Pix output pix

Throws:

java.io.IOException

removeLines

public static Pix removeLines(Pix pixs)

Removes horizontal lines from a grayscale image. The algorithm is based on Leptonica lineremoval.c example.
To remove vertical lines, rotate the image 90 degrees first, remove the horizontal lines, and rotate it back.

Parameters:

pixs - input pix

Returns:

pix with lines removed

See Also:

line-removal

despeckle

public static Pix despeckle(Pix pixs,
                            java.lang.String selStr,
                            int selSize)

Reduces speckle noise in image. The algorithm is based on Leptonica speckle_reg.c example demonstrating morphological method of removing speckle.

Parameters:

pixs - input pix

selStr - hit-miss sels in 2D layout; SEL_STR2 and SEL_STR3 are predefined values

selSize - 2 for 2x2, 3 for 3x3

Returns:

pix with speckle removed

disposePix

public static void disposePix(Pix pix)

Disposes of Pix resource.

Parameters:

pix -

dispose

public static void dispose(com.sun.jna.Structure resource)

Disposes of Leptonica native resource.

Parameters:

resource - A Leptonica object, such as Pix, Pixa, Box, Boxa, PixColormap, etc.