openjpeg/src/lib/openjp2/dwt.h

/*
 * The copyright in this software is being made available under the 2-clauses 
 * BSD License, included below. This software may be subject to other third 
 * party and contributor rights, including patent rights, and no such rights
 * are granted under this license.
 *
 * Copyright (c) 2002-2014, Universite catholique de Louvain (UCL), Belgium
 * Copyright (c) 2002-2014, Professor Benoit Macq
 * Copyright (c) 2001-2003, David Janssens
 * Copyright (c) 2002-2003, Yannick Verschueren
 * Copyright (c) 2003-2007, Francois-Olivier Devaux 
 * Copyright (c) 2003-2014, Antonin Descampe
 * Copyright (c) 2005, Herve Drolon, FreeImage Team
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
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 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
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 */

#ifndef __DWT_H
#define __DWT_H
/**
@file dwt.h
@brief Implementation of a discrete wavelet transform (DWT)

The functions in DWT.C have for goal to realize forward and inverse discret wavelet
transform with filter 5-3 (reversible) and filter 9-7 (irreversible). The functions in
DWT.C are used by some function in TCD.C.
*/

/** @defgroup DWT DWT - Implementation of a discrete wavelet transform */
/*@{*/


/** @name Exported functions */
/*@{*/
/* ----------------------------------------------------------------------- */
/**
Forward 5-3 wavelet transform in 2-D.
Apply a reversible DWT transform to a component of an image.
@param tilec Tile component information (current tile)
*/
OPJ_BOOL opj_dwt_encode(opj_tcd_tilecomp_t * tilec);

/**
Inverse 5-3 wavelet transform in 2-D.
Apply a reversible inverse DWT transform to a component of an image.
@param tilec Tile component information (current tile)
@param numres Number of resolution levels to decode
*/
OPJ_BOOL opj_dwt_decode(opj_tcd_tilecomp_t* tilec, OPJ_UINT32 numres);

/**
Get the gain of a subband for the reversible 5-3 DWT.
@param orient Number that identifies the subband (0->LL, 1->HL, 2->LH, 3->HH)
@return Returns 0 if orient = 0, returns 1 if orient = 1 or 2, returns 2 otherwise
*/
OPJ_UINT32 opj_dwt_getgain(OPJ_UINT32 orient) ;
/**
Get the norm of a wavelet function of a subband at a specified level for the reversible 5-3 DWT.
@param level Level of the wavelet function
@param orient Band of the wavelet function
@return Returns the norm of the wavelet function
*/
OPJ_FLOAT64 opj_dwt_getnorm(OPJ_UINT32 level, OPJ_UINT32 orient);
/**
Forward 9-7 wavelet transform in 2-D. 
Apply an irreversible DWT transform to a component of an image.
@param tilec Tile component information (current tile)
*/
OPJ_BOOL opj_dwt_encode_real(opj_tcd_tilecomp_t * tilec);
/**
Inverse 9-7 wavelet transform in 2-D. 
Apply an irreversible inverse DWT transform to a component of an image.
@param tilec Tile component information (current tile)
@param numres Number of resolution levels to decode
*/
OPJ_BOOL opj_dwt_decode_real(opj_tcd_tilecomp_t* restrict tilec, OPJ_UINT32 numres);

/**
Get the gain of a subband for the irreversible 9-7 DWT.
@param orient Number that identifies the subband (0->LL, 1->HL, 2->LH, 3->HH)
@return Returns the gain of the 9-7 wavelet transform
*/
OPJ_UINT32 opj_dwt_getgain_real(OPJ_UINT32 orient);
/**
Get the norm of a wavelet function of a subband at a specified level for the irreversible 9-7 DWT
@param level Level of the wavelet function
@param orient Band of the wavelet function
@return Returns the norm of the 9-7 wavelet
*/
OPJ_FLOAT64 opj_dwt_getnorm_real(OPJ_UINT32 level, OPJ_UINT32 orient);
/**
Explicit calculation of the Quantization Stepsizes 
@param tccp Tile-component coding parameters
@param prec Precint analyzed
*/
void opj_dwt_calc_explicit_stepsizes(opj_tccp_t * tccp, OPJ_UINT32 prec);
/* ----------------------------------------------------------------------- */
/*@}*/

/*@}*/

#endif /* __DWT_H */