1 /*
2 * -------------------------------------------------------------------------
3 * haar.c -- Haar wavelets coefficients.
4 * SWT - Scilab wavelet toolbox
5 * Copyright (C) 2005-2006 Roger Liu
6 * Copyright (C) 20010-2012 Holger Nahrstaedt
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 * -------------------------------------------------------------------------
22 */
23
24 #include "swtlib.h"
25
26 /*********************************************
27 * Local Variable (Filter Coefficent)
28 ********************************************/
29
30 static const double haar[2] = {
31 7.071067811865475244008443621048490392848359376884740365883398e-01,
32 7.071067811865475244008443621048490392848359376884740365883398e-01
33 //0.70710678, 0.70710678
34 };
35
36 /*********************************************
37 * Global Function
38 ********************************************/
39
40 void
haar_analysis_initialize(int member,swt_wavelet * pWaveStruct)41 haar_analysis_initialize (int member, swt_wavelet *pWaveStruct)
42 {
43 // double *pFilterCoef;
44
45 // pFilterCoef = haar;
46
47 pWaveStruct->length = 2;
48
49 wrev(haar, pWaveStruct->length,
50 LowDecomFilCoef, pWaveStruct->length);
51 qmf_wrev(haar, pWaveStruct->length,
52 HiDecomFilCoef, pWaveStruct->length);
53 pWaveStruct->pLowPass = LowDecomFilCoef;
54 pWaveStruct->pHiPass = HiDecomFilCoef;
55
56 return;
57 }
58
59 void
haar_synthesis_initialize(int member,swt_wavelet * pWaveStruct)60 haar_synthesis_initialize (int member, swt_wavelet *pWaveStruct)
61 {
62 // double *pFilterCoef;
63
64 // pFilterCoef = haar;
65 pWaveStruct->length = 2;
66
67 verbatim_copy(haar, pWaveStruct->length,
68 LowReconFilCoef, pWaveStruct->length);
69 qmf_even(haar, pWaveStruct->length,
70 HiReconFilCoef, pWaveStruct->length);
71 pWaveStruct->pLowPass = LowReconFilCoef;
72 pWaveStruct->pHiPass = HiReconFilCoef;
73
74 return;
75 }
76