Module org.scijava.ops.image

Package org.scijava.ops.image.threshold.localPhansalkar

Class ComputeLocalPhansalkarThreshold<T extends RealType<T>>

java.lang.Object

org.scijava.ops.image.threshold.localPhansalkar.ComputeLocalPhansalkarThreshold<T>

All Implemented Interfaces:

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

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

This is a modification of Sauvola's thresholding method to deal with low contrast images. In this algorithm the threshold is computed as t = mean*(1+p*exp(-q*mean)+k*((stdev/r)-1)) for an image that is normalized to [0, 1].

Phansalkar recommends k = 0.25, r = 0.5, p = 2 and q = 10. In the current implementation, the values of p and q are fixed but can be implemented as additional parameters.

Originally implemented from Phansalkar's paper description by G. Landini.

Phansalkar N. et al. Adaptive local thresholding for detection of nuclei in diversity stained cytology images. International Conference on Communications and Signal Processing (ICCSP), 2011, 218 - 220. doi:10.1109/ICCSP.2011.5739305

Author:

Stefan Helfrich (University of Konstanz)

Implementation Note:

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

Field Summary

Fields

Modifier and Type	Field	Description
static double	DEFAULT_K
static double	DEFAULT_R

Constructor Summary

Constructors

Constructor	Description
ComputeLocalPhansalkarThreshold()

Method Summary

Modifier and Type	Method	Description
void	compute(Iterable<T> inputNeighborhood, T inputCenterPixel, Double k, Double r, BitType output)	TODO

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

ComputeLocalPhansalkarThreshold

public ComputeLocalPhansalkarThreshold()

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 -