114 lines
4.5 KiB
C
114 lines
4.5 KiB
C
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/*
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* Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
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* Copyright (c) 2002-2007, Professor Benoit Macq
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* Copyright (c) 2001-2003, David Janssens
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* Copyright (c) 2002-2003, Yannick Verschueren
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* Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
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* Copyright (c) 2005, Herve Drolon, FreeImage Team
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __DWT_H
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#define __DWT_H
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/**
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@file dwt.h
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@brief Implementation of a discrete wavelet transform (DWT)
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The functions in DWT.C have for goal to realize forward and inverse discret wavelet
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transform with filter 5-3 (reversible) and filter 9-7 (irreversible). The functions in
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DWT.C are used by some function in TCD.C.
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*/
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/** @defgroup DWT DWT - Implementation of a discrete wavelet transform */
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/*@{*/
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/** @name Exported functions */
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/*@{*/
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/* ----------------------------------------------------------------------- */
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/**
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Forward 5-3 wavelet tranform in 2-D.
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Apply a reversible DWT transform to a component of an image.
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@param tilec Tile component information (current tile)
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*/
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void dwt_encode(opj_tcd_tilecomp_t * tilec);
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/**
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Inverse 5-3 wavelet tranform in 2-D.
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Apply a reversible inverse DWT transform to a component of an image.
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@param tilec Tile component information (current tile)
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@param numres Number of resolution levels to decode
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*/
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void dwt_decode(opj_tcd_tilecomp_t* tilec, int numres);
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/**
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Get the gain of a subband for the reversible 5-3 DWT.
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@param orient Number that identifies the subband (0->LL, 1->HL, 2->LH, 3->HH)
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@return Returns 0 if orient = 0, returns 1 if orient = 1 or 2, returns 2 otherwise
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*/
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int dwt_getgain(int orient);
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/**
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Get the norm of a wavelet function of a subband at a specified level for the reversible 5-3 DWT.
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@param level Level of the wavelet function
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@param orient Band of the wavelet function
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@return Returns the norm of the wavelet function
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*/
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double dwt_getnorm(int level, int orient);
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/**
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Forward 9-7 wavelet transform in 2-D.
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Apply an irreversible DWT transform to a component of an image.
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@param tilec Tile component information (current tile)
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*/
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void dwt_encode_real(opj_tcd_tilecomp_t * tilec);
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/**
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Inverse 9-7 wavelet transform in 2-D.
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Apply an irreversible inverse DWT transform to a component of an image.
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@param tilec Tile component information (current tile)
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@param numres Number of resolution levels to decode
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*/
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void dwt_decode_real(opj_tcd_tilecomp_t* tilec, int numres);
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/**
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Get the gain of a subband for the irreversible 9-7 DWT.
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@param orient Number that identifies the subband (0->LL, 1->HL, 2->LH, 3->HH)
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@return Returns the gain of the 9-7 wavelet transform
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*/
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int dwt_getgain_real(int orient);
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/**
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Get the norm of a wavelet function of a subband at a specified level for the irreversible 9-7 DWT
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@param level Level of the wavelet function
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@param orient Band of the wavelet function
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@return Returns the norm of the 9-7 wavelet
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*/
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double dwt_getnorm_real(int level, int orient);
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/**
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Explicit calculation of the Quantization Stepsizes
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@param tccp Tile-component coding parameters
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@param prec Precint analyzed
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*/
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void dwt_calc_explicit_stepsizes(opj_tccp_t * tccp, int prec);
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/* ----------------------------------------------------------------------- */
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/*@}*/
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/*@}*/
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#endif /* __DWT_H */
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