Interface WaveletFilter

    • Field Summary

      Fields 
      Modifier and Type Field 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

      All Methods Instance Methods Abstract Methods 
      Modifier and Type Method 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.

        A MORE PRECISE DEFINITION IS NEEDED

        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.

        A MORE PRECISE DEFINITION IS NEEDED

        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.

        A MORE PRECISE DEFINITION IS NEEDED

        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.

        A MORE PRECISE DEFINITION IS NEEDED

        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.

        A MORE PRECISE DEFINITION IS NEEDED

        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.

        A MORE PRECISE DEFINITION IS NEEDED

        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.

        A MORE PRECISE DEFINITION IS NEEDED

        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.

        A MORE PRECISE DEFINITION IS NEEDED

        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.