corrade-vassal – Rev 1
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/*
* CVS identifier:
*
* $Id: WaveletFilter.java,v 1.13 2001/08/02 11:11:16 grosbois Exp $
*
* Class: WaveletFilter
*
* Description: Defines the interface for WT filters (analysis
* and synthesis)
*
*
*
* COPYRIGHT:
*
* This software module was originally developed by Raphaël Grosbois and
* Diego Santa Cruz (Swiss Federal Institute of Technology-EPFL); Joel
* Askelöf (Ericsson Radio Systems AB); and Bertrand Berthelot, David
* Bouchard, Félix Henry, Gerard Mozelle and Patrice Onno (Canon Research
* Centre France S.A) in the course of development of the JPEG2000
* standard as specified by ISO/IEC 15444 (JPEG 2000 Standard). This
* software module is an implementation of a part of the JPEG 2000
* Standard. Swiss Federal Institute of Technology-EPFL, Ericsson Radio
* Systems AB and Canon Research Centre France S.A (collectively JJ2000
* Partners) agree not to assert against ISO/IEC and users of the JPEG
* 2000 Standard (Users) any of their rights under the copyright, not
* including other intellectual property rights, for this software module
* with respect to the usage by ISO/IEC and Users of this software module
* or modifications thereof for use in hardware or software products
* claiming conformance to the JPEG 2000 Standard. Those intending to use
* this software module in hardware or software products are advised that
* their use may infringe existing patents. The original developers of
* this software module, JJ2000 Partners and ISO/IEC assume no liability
* for use of this software module or modifications thereof. No license
* or right to this software module is granted for non JPEG 2000 Standard
* conforming products. JJ2000 Partners have full right to use this
* software module for his/her own purpose, assign or donate this
* software module to any third party and to inhibit third parties from
* using this software module for non JPEG 2000 Standard conforming
* products. This copyright notice must be included in all copies or
* derivative works of this software module.
*
* Copyright (c) 1999/2000 JJ2000 Partners.
*/
using System;
namespace CSJ2K.j2k.wavelet
{
/// <summary> 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.
///
/// <p>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.</p>
///
/// </summary>
/// <seealso cref="jj2000.j2k.wavelet.analysis.AnWTFilter">
///
/// </seealso>
/// <seealso cref="jj2000.j2k.wavelet.synthesis.SynWTFilter">
///
/// </seealso>
public struct WaveletFilter_Fields{
/// <summary>The ID for integer lifting spteps implementations </summary>
public readonly static int WT_FILTER_INT_LIFT = 0;
/// <summary>The ID for floating-point lifting spteps implementations </summary>
public readonly static int WT_FILTER_FLOAT_LIFT = 1;
/// <summary>The ID for floatring-poitn convolution implementations </summary>
public readonly static int WT_FILTER_FLOAT_CONVOL = 2;
}
public interface WaveletFilter
{
//UPGRADE_NOTE: Members of interface 'WaveletFilter' were extracted into structure 'WaveletFilter_Fields'. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1045'"
/// <summary> Returns the negative support of the low-pass analysis filter. That is
/// the number of taps of the filter in the negative direction.
///
/// </summary>
/// <returns> The number of taps of the low-pass analysis filter in the
/// negative direction
/// </returns>
int AnLowNegSupport
{
get;
}
/// <summary> Returns the positive support of the low-pass analysis filter. That is
/// the number of taps of the filter in the negative direction.
///
/// </summary>
/// <returns> The number of taps of the low-pass analysis filter in the
/// positive direction
/// </returns>
int AnLowPosSupport
{
get;
}
/// <summary> Returns the negative support of the high-pass analysis filter. That is
/// the number of taps of the filter in the negative direction.
///
/// </summary>
/// <returns> The number of taps of the high-pass analysis filter in the
/// negative direction
/// </returns>
int AnHighNegSupport
{
get;
}
/// <summary> Returns the positive support of the high-pass analysis filter. That is
/// the number of taps of the filter in the negative direction.
///
/// </summary>
/// <returns> The number of taps of the high-pass analysis filter in
/// the positive direction
/// </returns>
int AnHighPosSupport
{
get;
}
/// <summary> Returns the negative support of the low-pass synthesis filter. That is
/// the number of taps of the filter in the negative direction.
///
/// </summary>
/// <returns> The number of taps of the low-pass synthesis filter in the
/// negative direction
/// </returns>
int SynLowNegSupport
{
get;
}
/// <summary> Returns the positive support of the low-pass synthesis filter. That is
/// the number of taps of the filter in the negative direction.
///
/// </summary>
/// <returns> The number of taps of the low-pass synthesis filter in the
/// positive direction
/// </returns>
int SynLowPosSupport
{
get;
}
/// <summary> Returns the negative support of the high-pass synthesis filter. That is
/// the number of taps of the filter in the negative direction.
///
/// </summary>
/// <returns> The number of taps of the high-pass synthesis filter in the
/// negative direction
/// </returns>
int SynHighNegSupport
{
get;
}
/// <summary> Returns the positive support of the high-pass synthesis filter. That is
/// the number of taps of the filter in the negative direction.
///
/// </summary>
/// <returns> The number of taps of the high-pass synthesis filter in the
/// positive direction
/// </returns>
int SynHighPosSupport
{
get;
}
/// <summary> 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.
///
/// </summary>
/// <returns> The implementation type of this filter: WT_FILTER_INT_LIFT,
/// WT_FILTER_FLOAT_LIFT, WT_FILTER_FLOAT_CONVOL.
/// </returns>
int ImplType
{
get;
}
/// <summary> Returns the type of data on which this filter works, as defined in the
/// DataBlk interface.
///
/// </summary>
/// <returns> The type of data as defined in the DataBlk interface.
///
/// </returns>
/// <seealso cref="jj2000.j2k.image.DataBlk">
/// </seealso>
int DataType
{
get;
}
/// <summary> Returns the reversibility of the filter. A filter is considered
/// reversible if it is suitable for lossless coding.
///
/// </summary>
/// <returns> true if the filter is reversible, false otherwise.
///
/// </returns>
bool Reversible
{
get;
}
/// <summary> 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.
///
/// <p>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.</p>
///
/// </summary>
/// <param name="tailOvrlp">This is the number of samples in the input signal
/// before the first sample to filter that can be used for overlap.
///
/// </param>
/// <param name="headOvrlp">This is the number of samples in the input signal
/// after the last sample to filter that can be used for overlap.
///
/// </param>
/// <param name="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.
///
/// </param>
/// <returns> true if the overlaps are large enough and correct processing is
/// performed, false otherwise.
///
/// </returns>
bool isSameAsFullWT(int tailOvrlp, int headOvrlp, int inLen);
}
}
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