javax.media.jai.operator
Class ThresholdDescriptor
java.lang.Object
|
+--javax.media.jai.OperationDescriptorImpl
|
+--javax.media.jai.operator.ThresholdDescriptor
- All Implemented Interfaces:
- OperationDescriptor, RegistryElementDescriptor, Serializable
- public class ThresholdDescriptor
- extends OperationDescriptorImpl
An OperationDescriptor describing the "Threshold" operation.
The Threshold operation takes one rendered image, and maps all
the pixels of this image whose value falls within a specified range
to a specified constant. The range is specified by a low value and
a high value.
If the number of elements supplied via the "high", "low", and
"constants" arrays are less than the number of bands of the source
image, then the element from entry 0 is applied to all the bands.
Otherwise, the element from a different entry is applied to its
corresponding band.
The destination pixel values are defined by the pseudocode:
lowVal = (low.length < dstNumBands) ?
low[0] : low[b];
highVal = (high.length < dstNumBands) ?
high[0] : high[b];
const = (constants.length < dstNumBands) ?
constants[0] : constants[b];
if (src[x][y][b] >= lowVal && src[x][y][b] <= highVal) {
dst[x][y][b] = const;
} else {
dst[x][y][b] = src[x][y][b];
}
Resource List
| Name | Value |
|---|
| GlobalName | Threshold |
| LocalName | Threshold |
| Vendor | com.sun.media.jai |
| Description | Maps the pixels whose value falls between a low
value and a high value to a constant. |
| DocURL | http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/ThresholdDescriptor.html |
| Version | 1.0 |
| arg0Desc | The low value. |
| arg1Desc | The high value. |
| arg2Desc | The constant the pixels are mapped to. |
Parameter List
| Name | Class Type |
Default Value |
|---|
| low | double[] |
NO_PARAMETER_DEFAULT |
| high | double[] |
NO_PARAMETER_DEFAULT |
| constants | double[] |
NO_PARAMETER_DEFAULT |
- See Also:
OperationDescriptor, Serialized Form
| Methods inherited from class javax.media.jai.OperationDescriptorImpl |
arePropertiesSupported,
getDefaultSourceClass,
getDestClass,
getDestClass,
getInvalidRegion,
getName,
getNumParameters,
getNumSources,
getParamClasses,
getParamDefaults,
getParamDefaultValue,
getParameterListDescriptor,
getParamMaxValue,
getParamMinValue,
getParamNames,
getPropertyGenerators,
getPropertyGenerators,
getRenderableDestClass,
getRenderableSourceClasses,
getResourceBundle,
getResources,
getSourceClasses,
getSourceClasses,
getSourceNames,
getSupportedModes,
isImmediate,
isModeSupported,
isRenderedSupported,
makeDefaultSourceClassList,
validateArguments,
validateArguments,
validateParameters,
validateRenderableArguments,
validateRenderableSources,
validateSources,
validateSources |
| Methods inherited from class java.lang.Object |
clone,
equals,
finalize,
getClass,
hashCode,
notify,
notifyAll,
toString,
wait,
wait,
wait |
ThresholdDescriptor
public ThresholdDescriptor()
- Constructor.
isRenderableSupported
public boolean isRenderableSupported()
- Returns
true since renderable operation is supported.
- Overrides:
- isRenderableSupported in class OperationDescriptorImpl
- Tags copied from class: OperationDescriptorImpl
- See Also:
OperationDescriptorImpl.isModeSupported(java.lang.String)
validateParameters
protected boolean validateParameters(ParameterBlock args,
StringBuffer msg)
- Validates input parameters.
- Overrides:
- validateParameters in class OperationDescriptorImpl
- Tags copied from class: OperationDescriptorImpl
- Throws:
- IllegalArgumentException - if
args is null.- IllegalArgumentException - if
msg is null
and the validation fails. - See Also:
OperationDescriptorImpl.validateParameters(java.lang.String, java.awt.image.renderable.ParameterBlock, java.lang.StringBuffer)