WaveletFilter (Unidata jj2000 5.2 API)

All Known Implementing Classes:

AnWTFilter, AnWTFilterFloat, AnWTFilterFloatLift9x7, AnWTFilterInt, AnWTFilterIntLift5x3, SynWTFilter, SynWTFilterFloat, SynWTFilterFloatLift9x7, SynWTFilterInt, SynWTFilterIntLift5x3
```
public interface WaveletFilter
```
This interface defines how a wavelet filter implementation should present itself. This interface defines only the commonalities between the analysis and synthesis filters. The AnWTFilter and SynWTFilter classes provide the specifics of analysis and synthesis filters.
Both analysis and filters must be able to return the extent of the negative and positive support for both synthesis and analysis sides. This simplifies the sue of some functionalities that need extra information about the filters.

See Also:
AnWTFilter, SynWTFilter

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`WT_FILTER_FLOAT_CONVOL` The ID for floatring-poitn convolution implementations
`static int`	`WT_FILTER_FLOAT_LIFT` The ID for floating-point lifting spteps implementations
`static int`	`WT_FILTER_INT_LIFT` The ID for integer lifting spteps implementations

Method Summary

Methods
Modifier and Type	Method and Description
`int`	`getAnHighNegSupport()` Returns the negative support of the high-pass analysis filter.
`int`	`getAnHighPosSupport()` Returns the positive support of the high-pass analysis filter.
`int`	`getAnLowNegSupport()` Returns the negative support of the low-pass analysis filter.
`int`	`getAnLowPosSupport()` Returns the positive support of the low-pass analysis filter.
`int`	`getDataType()` Returns the type of data on which this filter works, as defined in the DataBlk interface.
`int`	`getImplType()` Returns the implementation type of this filter, as defined in this class, such as WT_FILTER_INT_LIFT, WT_FILTER_FLOAT_LIFT, WT_FILTER_FLOAT_CONVOL.
`int`	`getSynHighNegSupport()` Returns the negative support of the high-pass synthesis filter.
`int`	`getSynHighPosSupport()` Returns the positive support of the high-pass synthesis filter.
`int`	`getSynLowNegSupport()` Returns the negative support of the low-pass synthesis filter.
`int`	`getSynLowPosSupport()` Returns the positive support of the low-pass synthesis filter.
`boolean`	`isReversible()` Returns the reversibility of the filter.
`boolean`	`isSameAsFullWT(int tailOvrlp, int headOvrlp, int inLen)` Returns true if the wavelet filter computes or uses the same "inner" subband coefficient as the full frame wavelet transform, and false otherwise.

- Field Detail
  - WT_FILTER_INT_LIFT
```
static final int WT_FILTER_INT_LIFT
```
    The ID for integer lifting spteps implementations
    
    See Also:
    Constant Field Values
  - WT_FILTER_FLOAT_LIFT
```
static final int WT_FILTER_FLOAT_LIFT
```
    The ID for floating-point lifting spteps implementations
    
    See Also:
    Constant Field Values
  - WT_FILTER_FLOAT_CONVOL
```
static final int WT_FILTER_FLOAT_CONVOL
```
    The ID for floatring-poitn convolution implementations
    
    See Also:
    Constant Field Values
- Method Detail
  - getAnLowNegSupport
```
int getAnLowNegSupport()
```
    Returns the negative support of the low-pass analysis filter. That is the number of taps of the filter in the negative direction.
    
    Returns:
    The number of taps of the low-pass analysis filter in the negative direction
  - getAnLowPosSupport
```
int getAnLowPosSupport()
```
    Returns the positive support of the low-pass analysis filter. That is the number of taps of the filter in the negative direction.
    
    Returns:
    The number of taps of the low-pass analysis filter in the positive direction
  - getAnHighNegSupport
```
int getAnHighNegSupport()
```
    Returns the negative support of the high-pass analysis filter. That is the number of taps of the filter in the negative direction.
    
    Returns:
    The number of taps of the high-pass analysis filter in the negative direction
  - getAnHighPosSupport
```
int getAnHighPosSupport()
```
    Returns the positive support of the high-pass analysis filter. That is the number of taps of the filter in the negative direction.
    
    Returns:
    The number of taps of the high-pass analysis filter in the positive direction
  - getSynLowNegSupport
```
int getSynLowNegSupport()
```
    Returns the negative support of the low-pass synthesis filter. That is the number of taps of the filter in the negative direction.
    
    Returns:
    The number of taps of the low-pass synthesis filter in the negative direction
  - getSynLowPosSupport
```
int getSynLowPosSupport()
```
    Returns the positive support of the low-pass synthesis filter. That is the number of taps of the filter in the negative direction.
    
    Returns:
    The number of taps of the low-pass synthesis filter in the positive direction
  - getSynHighNegSupport
```
int getSynHighNegSupport()
```
    Returns the negative support of the high-pass synthesis filter. That is the number of taps of the filter in the negative direction.
    
    Returns:
    The number of taps of the high-pass synthesis filter in the negative direction
  - getSynHighPosSupport
```
int getSynHighPosSupport()
```
    Returns the positive support of the high-pass synthesis filter. That is the number of taps of the filter in the negative direction.
    
    Returns:
    The number of taps of the high-pass synthesis filter in the positive direction
  - getImplType
```
int getImplType()
```
    Returns the implementation type of this filter, as defined in this class, such as WT_FILTER_INT_LIFT, WT_FILTER_FLOAT_LIFT, WT_FILTER_FLOAT_CONVOL.
    
    Returns:
    The implementation type of this filter: WT_FILTER_INT_LIFT, WT_FILTER_FLOAT_LIFT, WT_FILTER_FLOAT_CONVOL.
  - getDataType
```
int getDataType()
```
    Returns the type of data on which this filter works, as defined in the DataBlk interface.
    
    Returns:
    The type of data as defined in the DataBlk interface.
    See Also:
    DataBlk
  - isReversible
```
boolean isReversible()
```
    Returns the reversibility of the filter. A filter is considered reversible if it is suitable for lossless coding.
    
    Returns:
    true if the filter is reversible, false otherwise.
  - isSameAsFullWT
```
boolean isSameAsFullWT(int tailOvrlp,
                     int headOvrlp,
                     int inLen)
```
    Returns true if the wavelet filter computes or uses the same "inner" subband coefficient as the full frame wavelet transform, and false otherwise. In particular, for block based transforms with reduced overlap, this method should return false. The term "inner" indicates that this applies only with respect to the coefficient that are not affected by image boundaries processings such as symmetric extension, since there is not reference method for this.
    The result depends on the length of the allowed overlap when compared to the overlap required by the wavelet filter. It also depends on how overlap processing is implemented in the wavelet filter.
    
    Parameters:
    tailOvrlp - This is the number of samples in the input signal before the first sample to filter that can be used for overlap.
    headOvrlp - This is the number of samples in the input signal after the last sample to filter that can be used for overlap.
    inLen - This is the lenght of the input signal to filter.The required number of samples in the input signal after the last sample depends on the length of the input signal.
    
    Returns:
    true if the overlaps are large enough and correct processing is performed, false otherwise.

Interface WaveletFilter

Field Summary

Method Summary

Field Detail

WT_FILTER_INT_LIFT

WT_FILTER_FLOAT_LIFT

WT_FILTER_FLOAT_CONVOL

Method Detail

getAnLowNegSupport

getAnLowPosSupport

getAnHighNegSupport

getAnHighPosSupport

getSynLowNegSupport

getSynLowPosSupport

getSynHighNegSupport

getSynHighPosSupport

getImplType

getDataType

isReversible

isSameAsFullWT