org.geotools.coverage.processing.operation
Class Rescale
Object
AbstractOperation
Operation2D
OperationJAI
Rescale
- All Implemented Interfaces:
- Serializable, Operation
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 |
"Source" |
GridCoverage2D |
N/A |
N/A |
N/A |
"constants" |
double[] |
1.0 |
N/A |
N/A |
"offsets" |
double[] |
0.0 |
N/A |
N/A |
- Since:
- 2.2
- Author:
- Martin Desruisseaux (IRD)
- See Also:
Operations.rescale(org.opengis.coverage.Coverage, double[], double[])
,
RescaleDescriptor
,
Serialized Form
Constructor Summary |
Rescale()
Constructs a default "Rescale" operation. |
Methods inherited from class OperationJAI |
createRenderedImage, deriveCategory, deriveGridCoverage, deriveName, deriveSampleDimension, deriveUnit, doOperation, equals, getJAI, getOperationDescriptor, getProperties, getQuantitative, prepareParameters, resampleToCommonGeometry |
Rescale
public Rescale()
- Constructs a default
"Rescale"
operation.
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
"GradientMagnitude"
, this array has a length of 1. For binary operations
like "add"
and "multiply"
, 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
null
if unknow.
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