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1 function [y,L] = midwt(x,h,L);
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2 % [x,L] = midwt(y,h,L);
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3 %
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4 % Function computes the inverse discrete wavelet transform x for a 1D or
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5 % 2D input signal y using the scaling filter h.
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6 %
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7 % Input:
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8 % y : finite length 1D or 2D input signal (implicitly periodized)
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9 % (see function mdwt to find the structure of y)
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10 % h : scaling filter
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11 % L : number of levels. In the case of a 1D signal, length(x) must be
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12 % divisible by 2^L; in the case of a 2D signal, the row and the
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13 % column dimension must be divisible by 2^L. If no argument is
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14 % specified, a full inverse DWT is returned for maximal possible
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15 % L.
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16 %
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17 % Output:
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18 % x : periodic reconstructed signal
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19 % L : number of decomposition levels
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20 %
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21 % 1D Example:
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22 % xin = makesig('LinChirp',8);
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23 % h = daubcqf(4,'min');
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24 % L = 1;
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25 % [y,L] = mdwt(xin,h,L);
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26 % [x,L] = midwt(y,h,L)
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27 %
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28 % 1D Example's output:
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29 %
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30 % x = 0.0491 0.1951 0.4276 0.7071 0.9415 0.9808 0.6716 0.0000
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31 % L = 1
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32 %
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33 % See also: mdwt, mrdwt, mirdwt
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34 %
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35
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36 %
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37 %
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38 %File Name: midwt.m
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39 %Last Modification Date: 08/07/95 15:13:52
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40 %Current Version: midwt.m 2.4
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41 %File Creation Date: Wed Oct 19 10:51:58 1994
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42 %Author: Markus Lang <lang@jazz.rice.edu>
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43 %
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44 %Copyright (c) 2000 RICE UNIVERSITY. All rights reserved.
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45 %Created by Markus Lang, Department of ECE, Rice University.
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46 %
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47 %This software is distributed and licensed to you on a non-exclusive
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48 %basis, free-of-charge. Redistribution and use in source and binary forms,
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49 %with or without modification, are permitted provided that the following
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50 %conditions are met:
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51 %
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52 %1. Redistribution of source code must retain the above copyright notice,
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53 % this list of conditions and the following disclaimer.
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54 %2. Redistribution in binary form must reproduce the above copyright notice,
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55 % this list of conditions and the following disclaimer in the
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56 % documentation and/or other materials provided with the distribution.
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57 %3. All advertising materials mentioning features or use of this software
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58 % must display the following acknowledgment: This product includes
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59 % software developed by Rice University, Houston, Texas and its contributors.
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60 %4. Neither the name of the University nor the names of its contributors
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61 % may be used to endorse or promote products derived from this software
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62 % without specific prior written permission.
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63 %
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64 %THIS SOFTWARE IS PROVIDED BY WILLIAM MARSH RICE UNIVERSITY, HOUSTON, TEXAS,
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65 %AND CONTRIBUTORS AS IS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
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66 %BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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67 %FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RICE UNIVERSITY
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68 %OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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69 %EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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70 %PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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71 %OR BUSINESS INTERRUPTIONS) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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72 %WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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73 %OTHERWISE), PRODUCT LIABILITY, OR OTHERWISE ARISING IN ANY WAY OUT OF THE
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74 %USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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75 %
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76 %For information on commercial licenses, contact Rice University's Office of
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77 %Technology Transfer at techtran@rice.edu or (713) 348-6173
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78 %
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79 %Change History:
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80 %
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81 %Modification #1
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82 %Mon Aug 7 11:52:33 CDT 1995
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83 %Rebecca Hindman <hindman@ece.rice.edu>
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84 %Added L to function line so that it can be displayed as an output
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85 %
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86 %Thu Mar 2 13:07:11 CDT 2000
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87 %Ramesh Neelamani<neelsh@ece.rice.edu>
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88 %Revamped the help file
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89 %
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90
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91
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92
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93
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