/* 
* CVS identifier:
* 
* $Id: ForwWT.java,v 1.9 2001/10/24 12:02:13 grosbois Exp $
* 
* Class:                   ForwWT
* 
* Description:             The interface for implementations of a forward
*                          wavelet transform.
* 
* 
* 
* 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;
using CSJ2K.j2k.wavelet;
namespace CSJ2K.j2k.wavelet.analysis
{
	
	/// <summary> This interface extends the WaveletTransform with the specifics of forward
	/// wavelet transforms. Classes that implement forward wavelet transfoms should
	/// implement this interface.
	/// 
	/// <p>This class does not define the methods to transfer data, just the
	/// specifics to forward wavelet transform. Different data transfer methods are 
	/// evisageable for different transforms.</p>
	/// 
	/// </summary>
	public interface ForwWT:WaveletTransform, ForwWTDataProps
	{
		
		/// <summary> Returns the horizontal analysis wavelet filters used in each level, for
		/// the specified tile-component. The first element in the array is the
		/// filter used to obtain the lowest resolution (resolution level 0)
		/// subbands (i.e. lowest frequency LL subband), the second element is the
		/// one used to generate the resolution level 1 subbands, and so on. If
		/// there are less elements in the array than the number of resolution
		/// levels, then the last one is assumed to repeat itself.
		/// 
		/// <p>The returned filters are applicable only to the specified component
		/// and in the current tile.</p>
		/// 
		/// <p>The resolution level of a subband is the resolution level to which a
		/// subband contributes, which is different from its decomposition
		/// level.</p>
		/// 
		/// </summary>
		/// <param name="t">The index of the tile for which to return the filters.
		/// 
		/// </param>
		/// <param name="c">The index of the component for which to return the filters.
		/// 
		/// </param>
		/// <returns> The horizontal analysis wavelet filters used in each level.
		/// 
		/// </returns>
		AnWTFilter[] getHorAnWaveletFilters(int t, int c);
		
		/// <summary> Returns the vertical analysis wavelet filters used in each level, for
		/// the specified tile-component. The first element in the array is the
		/// filter used to obtain the lowest resolution (resolution level 0)
		/// subbands (i.e. lowest frequency LL subband), the second element is the
		/// one used to generate the resolution level 1 subbands, and so on. If
		/// there are less elements in the array than the number of resolution
		/// levels, then the last one is assumed to repeat itself.
		/// 
		/// <p>The returned filters are applicable only to the specified component
		/// and in the current tile.</p>
		/// 
		/// <p>The resolution level of a subband is the resolution level to which a
		/// subband contributes, which is different from its decomposition
		/// level.</p>
		/// 
		/// </summary>
		/// <param name="t">The index of the tile for which to return the filters.
		/// 
		/// </param>
		/// <param name="c">The index of the component for which to return the filters.
		/// 
		/// </param>
		/// <returns> The vertical analysis wavelet filters used in each level.
		/// 
		/// </returns>
		AnWTFilter[] getVertAnWaveletFilters(int t, int c);
		
		/// <summary> Returns the number of decomposition levels that are applied to obtain
		/// the LL band, in the specified tile-component. A value of 0 means that
		/// no wavelet transform is applied.
		/// 
		/// </summary>
		/// <param name="t">The tile index
		/// 
		/// </param>
		/// <param name="c">The index of the component.
		/// 
		/// </param>
		/// <returns> The number of decompositions applied to obtain the LL subband
		/// (0 for no wavelet transform).
		/// 
		/// </returns>
		int getDecompLevels(int t, int c);
		
		/// <summary> Returns the wavelet tree decomposition. Only WT_DECOMP_DYADIC is
		/// supported by JPEG 2000 part I.
		/// 
		/// </summary>
		/// <param name="t">The tile index
		/// 
		/// </param>
		/// <param name="c">The index of the component.
		/// 
		/// </param>
		/// <returns> The wavelet decomposition.
		/// 
		/// </returns>
		int getDecomp(int t, int c);
	}
}