org.geotools.image.jai
Interface CombineTransform

public interface CombineTransform

Transforms the sample values for one pixel during a "Combine" operation. The method transformSamples(double[]) is invoked by Combine.computeRect(...) just before the sample values are combined as values[0]*row[0] + values[1]*row[1] + values[2]*row[2] + ... + row[sourceBands]. This interface provides a hook where non-linear transformations can be performed before the linear one. For example, the method could substitutes some values by their logarithm.

Since:

2.1

Version:

$Id: CombineTransform.java 17672 2006-01-19 00:25:55Z desruisseaux $

Author:

Martin Desruisseaux

Method Summary

boolean	isSeparable() Returns if the transformation performed by transformSamples(double[]) do not depends on the ordering of samples in the array.
void	transformSamples(double[] values) Transforms the sample values for one pixel before the linear combinaison.

Method Detail

transformSamples

public void transformSamples(double[] values)

Transforms the sample values for one pixel before the linear combinaison.

Parameters:

values - The sampel values to transformation. Transformation are performed in-place.

isSeparable

public boolean isSeparable()

Returns if the transformation performed by transformSamples(double[]) do not depends on the ordering of samples in the array. This method can returns if the implementation meet the following conditions:

• The transformation is separable, i.e. the output value depends only on the input value for all i.
• The transformation do not depends on the value of the index i.

For example, the following implementations meets the above mentioned conditions:

 for (int i=0; i

A value will allows some optimisations inside the Combine.computeRect(...) method. This method may conservatly returns if this information is unknow.