Module org.scijava.ops.image

Package org.scijava.ops.image.threshold.localSauvola

Class ComputeLocalSauvolaThreshold<T extends RealType<T>>

java.lang.Object

org.scijava.ops.image.threshold.localSauvola.ComputeLocalSauvolaThreshold<T>

All Implemented Interfaces:

Computers.Arity4<Iterable<T>,T,Double,Double,BitType>, Consumers.Arity5<Iterable<T>,T,Double,Double,BitType>

public class ComputeLocalSauvolaThreshold<T extends RealType<T>>
extends Object
implements Computers.Arity4<Iterable<T>,T,Double,Double,BitType>

This is a modification of Niblack's thresholding method. In contrast to the recommendation on parameters in the publication, this implementation operates on normalized images (to the [0, 1] range). Hence, the r parameter defaults to half the possible standard deviation in a normalized image, namely 0.5.

Sauvola J. and Pietaksinen M. (2000) "Adaptive Document Image Binarization" Pattern Recognition, 33(2): 225-236. PDF

Original ImageJ implementation by Gabriel Landini.

Author:

Stefan Helfrich (University of Konstanz)

Implementation Note:

op names='threshold.localSauvola', priority='-100.'

Field Summary

Fields

Modifier and Type	Field	Description
static double	DEFAULT_K
static double	DEFAULT_R

Constructor Summary

Constructors

Constructor	Description
ComputeLocalSauvolaThreshold()

Method Summary

Modifier and Type	Method	Description
void	compute(Iterable<T> inputNeighborhood, T inputCenterPixel, Double k, Double r, BitType output)	TODO
static <T extends RealType<T>> void	compute(Iterable<T> inputNeighborhood, T inputCenterPixel, Double k, Double r, Computers.Arity1<Iterable<T>,DoubleType> meanOp, Computers.Arity1<Iterable<T>,DoubleType> stdDeviationOp, BitType output)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.scijava.function.Computers.Arity4

accept

Methods inherited from interface org.scijava.function.Consumers.Arity5

andThen

Field Detail

DEFAULT_K

public static final double DEFAULT_K

See Also:

Constant Field Values

DEFAULT_R

public static final double DEFAULT_R

See Also:

Constant Field Values

Constructor Detail

ComputeLocalSauvolaThreshold

public ComputeLocalSauvolaThreshold()

Method Detail

compute

public void compute(Iterable<T> inputNeighborhood,
                    T inputCenterPixel,
                    Double k,
                    Double r,
                    BitType output)

TODO

Specified by:

compute in interface Computers.Arity4<Iterable<T extends RealType<T>>,T extends RealType<T>,Double,Double,BitType>

Parameters:

inputNeighborhood -

inputCenterPixel -

k -

r -

output -

compute

public static <T extends RealType<T>> void compute(Iterable<T> inputNeighborhood,
                                                   T inputCenterPixel,
                                                   Double k,
                                                   Double r,
                                                   Computers.Arity1<Iterable<T>,DoubleType> meanOp,
                                                   Computers.Arity1<Iterable<T>,DoubleType> stdDeviationOp,
                                                   BitType output)