Package boofcv.alg.filter.binary

Class ThresholdNick

java.lang.Object

boofcv.alg.filter.binary.ThresholdNick

All Implemented Interfaces:

InputToBinary<GrayF32>

public class ThresholdNick
extends Object
implements InputToBinary<GrayF32>

Based off the NICK algorithm described in [1] this is a thresholding algorithm intended for use on low quality ancient documents. A sliding windows approach is employed and is inspired by Niblack. It's designed to better handled "white" and ligh page images by shifting the threshold down.

[1] Khurshid, Khurram, et al. "Comparison of Niblack inspired Binarization methods for ancient documents." Document Recognition and Retrieval XVI. Vol. 7247. International Society for Optics and Photonics, 2009.

Constructor Summary

Constructors

Constructor	Description
ThresholdNick(ConfigLength width, float k, boolean down)	Configures the algorithm.

Method Summary

Modifier and Type	Method	Description
ImageType<GrayF32>	getInputType()
float	getK()
ConfigLength	getWidth()
boolean	isDown()
void	process(GrayF32 input, GrayU8 output)	Converts the input image into a binary image.
void	setDown(boolean down)
void	setK(float k)
void	setWidth(ConfigLength width)

Methods inherited from class java.lang.Object

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

Constructor Details

ThresholdNick

public ThresholdNick(ConfigLength width,
 float k,
 boolean down)

Configures the algorithm.

Parameters:

width - size of local region. Try 31

k - The Niblack factor. Recommend -0.1 to -0.2

down - Threshold down or up

Method Details

process

public void process(GrayF32 input,
 GrayU8 output)

Converts the input image into a binary image.

Specified by:

process in interface InputToBinary<GrayF32>

Parameters:

input - Input image. Not modified.

output - Output binary image. Modified.

getInputType

public ImageType<GrayF32> getInputType()

Specified by:

getInputType in interface InputToBinary<GrayF32>

getK

public float getK()

setK

public void setK(float k)

getWidth

public ConfigLength getWidth()

setWidth

public void setWidth(ConfigLength width)

isDown

public boolean isDown()

setDown

public void setDown(boolean down)