org.geotools.coverage.processing.operation
Class Rescale

java.lang.Object
  org.geotools.coverage.processing.AbstractOperation
      org.geotools.coverage.processing.Operation2D
          org.geotools.coverage.processing.OperationJAI
              org.geotools.coverage.processing.operation.Rescale

All Implemented Interfaces:

org.opengis.coverage.processing.Operation, java.io.Serializable

public class Rescale

extends OperationJAI

Maps the sample values of a coverage from one range to another range. The rescaling is done by multiplying each sample value by one of a set of constants and then adding another constant to the result of the multiplication. The destination sample values are defined by the pseudocode:

dst[x][y][b] = src[x][y][b]*constant + offset;

Name: "Rescale"
JAI operator: "Rescale"
Parameters:

Name	Class	Default value	Minimum value	Maximum value
	GridCoverage2D	N/A	N/A	N/A
	double[]	1.0	N/A	N/A
	double[]	0.0	N/A	N/A

Since:

2.2

Version:

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

Author:

Martin Desruisseaux

See Also:

Operations.rescale(org.opengis.coverage.Coverage, double[], double[]), RescaleDescriptor, Serialized Form

To Do:

Should operates on transform when possible. See GEOT-610.

Nested Class Summary

Nested classes inherited from class org.geotools.coverage.processing.OperationJAI

OperationJAI.Parameters

Field Summary

Fields inherited from class org.geotools.coverage.processing.OperationJAI

operation

Fields inherited from class org.geotools.coverage.processing.Operation2D

SOURCE_0

Fields inherited from class org.geotools.coverage.processing.AbstractOperation

descriptor

Constructor Summary

Rescale()
Constructs a default operation.

Method Summary

protected NumberRange

deriveRange(NumberRange[] ranges, OperationJAI.Parameters parameters) Returns the expected range of values for the resulting image.

Methods inherited from class org.geotools.coverage.processing.OperationJAI

computeOnGeophysicsValues, createRenderedImage, deriveCategory, deriveGridCoverage, deriveName, deriveSampleDimension, deriveUnit, doOperation, equals, getJAI, resampleToCommonGeometry

Methods inherited from class org.geotools.coverage.processing.Operation2D

getFactory, getGridCoverageProcessor

Methods inherited from class org.geotools.coverage.processing.AbstractOperation

ensureNonNull, getDescription, getDocURL, getName, getNumSources, getParameters, getProcessor, getVendor, getVersion, hashCode, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Rescale

public Rescale()

Constructs a default operation.

Method Detail

deriveRange

protected NumberRange deriveRange(NumberRange[] ranges,
                                  OperationJAI.Parameters parameters)

Returns the expected range of values for the resulting image.

Overrides:

deriveRange in class OperationJAI

Parameters:

ranges - The range of values from every sources. For unary operations like , this array has a length of 1. For binary operations like and , this array has a length of 2.

parameters - Parameters, rendering hints and coordinate reference system to use.

Returns:

The range of values to use in the destination image, or if unknow.

To Do:

Not yet implemented.