comparison util/Rice Wavelet Toolbox/midwt_r.c @ 78:f69ae88b8be5

added Rice Wavelet Toolbox with my modification, so it can be compiled on newer systems.

+/*
+File Name: MIDWT.c
+Last Modification Date:	06/14/95	13:01:15
+Current Version: MIDWT.c	2.4
+File Creation Date: Wed Oct 12 08:44:43 1994
+Author: Markus Lang  <[e-mail]>
+
+Copyright (c) 2000 RICE UNIVERSITY. All rights reserved.
+Created by Markus Lang, Department of ECE, Rice University. 
+
+This software is distributed and licensed to you on a non-exclusive 
+basis, free-of-charge. Redistribution and use in source and binary forms, 
+with or without modification, are permitted provided that the following 
+conditions are met:
+
+1. Redistribution of source code must retain the above copyright notice, 
+   this list of conditions and the following disclaimer.
+2. Redistribution in binary form must reproduce the above copyright notice, 
+   this list of conditions and the following disclaimer in the 
+   documentation and/or other materials provided with the distribution.
+3. All advertising materials mentioning features or use of this software 
+   must display the following acknowledgment: This product includes 
+   software developed by Rice University, Houston, Texas and its contributors.
+4. Neither the name of the University nor the names of its contributors 
+   may be used to endorse or promote products derived from this software 
+   without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY WILLIAM MARSH RICE UNIVERSITY, HOUSTON, TEXAS, 
+AND CONTRIBUTORS AS IS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, 
+BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
+FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RICE UNIVERSITY 
+OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
+EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
+PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
+OR BUSINESS INTERRUPTIONS) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
+WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
+OTHERWISE), PRODUCT LIABILITY, OR OTHERWISE ARISING IN ANY WAY OUT OF THE 
+USE OF THIS SOFTWARE,  EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+For information on commercial licenses, contact Rice University's Office of 
+Technology Transfer at [e-mail] or [phone]
+
+Change History: Fixed the code such that 1D vectors passed to it can be in
+                either passed as a row or column vector. Also took care of 
+		the code such that it will compile with both under standard
+		C compilers as well as for ANSI C compilers
+		Jan Erik Odegard <[e-mail]> Wed Jun 14 1995
+
+		Fix minor bug to allow maximum number of levels
+
+decription of the matlab call:
+%y = midwt(x,h,L);
+% 
+% function computes the inverse discrete wavelet transform y for a 1D or 2D
+% input signal x.
+%
+%    Input:
+%	x    : finite length 1D or 2D input signal (implicitely periodized)
+%       h    : scaling filter
+%       L    : number of levels. in case of a 1D signal length(x) must be
+%              divisible by 2^L; in case of a 2D signal the row and the
+%              column dimension must be divisible by 2^L.
+%
+% see also: mdwt, mrdwt, mirdwt
+
+*/
+
+#include <math.h>
+#include <stdio.h>
+#include <inttypes.h>
+
+#define max(A,B) (A > B ? A : B)
+#define mat(a, i, j) (*(a + (m*(j)+i)))  /* macro for matrix indices */
+
+
+#ifdef __STDC__
+MIDWT(double *x, uintptr_t m, uintptr_t n, double *h, uintptr_t lh, uintptr_t L, double *y)
+#else
+MIDWT(x, m, n, h, lh, L, y)
+double *x, *h, *y;
+uintptr_t m, n, lh, L;
+#endif
+{
+  double  *g0, *g1, *ydummyl, *ydummyh, *xdummy;
+  uintptr_t i, j;
+  uintptr_t actual_L, actual_m, actual_n, r_o_a, c_o_a, ir, ic, lhm1, lhhm1, sample_f;
+  xdummy = (double *)(uintptr_t)mxCalloc(max(m,n),sizeof(double));
+  ydummyl = (double *)(uintptr_t)mxCalloc(max(m,n)+lh/2-1,sizeof(double));
+  ydummyh = (double *)(uintptr_t)mxCalloc(max(m,n)+lh/2-1,sizeof(double));
+  g0 = (double *)(uintptr_t)mxCalloc(lh,sizeof(double));
+  g1 = (double *)(uintptr_t)mxCalloc(lh,sizeof(double));
+
+  if (n==1){
+    n = m;
+    m = 1;
+  }
+  /* synthesis lowpass and highpass */
+  for (i=0; i<lh; i++){
+    g0[i] = h[i];
+    g1[i] = h[lh-i-1];
+  }
+  for (i=1; i<=lh; i+=2)
+    g1[i] = -g1[i];
+  
+  lhm1 = lh - 1;
+  lhhm1 = lh/2 - 1;
+  /* 2^L */
+  sample_f = 1;
+  for (i=1; i<L; i++)
+    sample_f = sample_f*2;
+  
+  if (m>1)
+    actual_m = m/sample_f;
+  else 
+    actual_m = 1;
+  actual_n = n/sample_f;
+
+  for (i=0; i<(m*n); i++)
+    x[i] = y[i];
+  
+  /* main loop */
+  for (actual_L=L; actual_L >= 1; actual_L--){
+    r_o_a = actual_m/2;
+    c_o_a = actual_n/2;
+    
+    /* go by columns in case of a 2D signal*/
+    if (m>1){
+      for (ic=0; ic<actual_n; ic++){            /* loop over column */
+	/* store in dummy variables */
+	ir = r_o_a;
+	for (i=0; i<r_o_a; i++){    
+	  ydummyl[i+lhhm1] = mat(x, i, ic);  
+	  ydummyh[i+lhhm1] = mat(x, ir++, ic);  
+	}
+	/* perform filtering lowpass and highpass*/
+	bpsconv(xdummy, r_o_a, g0, g1, lhm1, lhhm1, ydummyl, ydummyh); 
+	/* restore dummy variables in matrix */
+	for (i=0; i<actual_m; i++)
+	  mat(x, i, ic) = xdummy[i];  
+      }
+    }
+    /* go by rows */
+    for (ir=0; ir<actual_m; ir++){            /* loop over rows */
+      /* store in dummy variable */
+      ic = c_o_a;
+      for  (i=0; i<c_o_a; i++){    
+	ydummyl[i+lhhm1] = mat(x, ir, i);  
+	ydummyh[i+lhhm1] = mat(x, ir, ic++);  
+      } 
+      /* perform filtering lowpass and highpass*/
+      bpsconv(xdummy, c_o_a, g0, g1, lhm1, lhhm1, ydummyl, ydummyh); 
+      /* restore dummy variables in matrices */
+      for (i=0; i<actual_n; i++)
+        mat(x, ir, i) = xdummy[i];  
+    }  
+    if (m==1)
+      actual_m = 1;
+    else
+      actual_m = actual_m*2;
+    actual_n = actual_n*2;
+  }
+}
+
+#ifdef __STDC__
+bpsconv(double *x_out, uintptr_t lx, double *g0, double *g1, uintptr_t lhm1, 
+	uintptr_t lhhm1, double *x_inl, double *x_inh)
+#else
+bpsconv(x_out, lx, g0, g1, lhm1, lhhm1, x_inl, x_inh)
+double *x_inl, *x_inh, *g0, *g1, *x_out;
+uintptr_t lx, lhm1, lhhm1;
+#endif
+{
+  uintptr_t i, j, ind, tj;
+  double x0, x1;
+
+  for (i=lhhm1-1; i > -1; i--){
+    x_inl[i] = x_inl[lx+i];
+    x_inh[i] = x_inh[lx+i];
+  }
+  ind = 0;
+  for (i=0; i<(lx); i++){
+    x0 = 0;
+    x1 = 0;
+    tj = -2;
+    for (j=0; j<=lhhm1; j++){
+      tj+=2;
+      x0 = x0 + x_inl[i+j]*g0[lhm1-1-tj] + x_inh[i+j]*g1[lhm1-1-tj] ;
+      x1 = x1 + x_inl[i+j]*g0[lhm1-tj] + x_inh[i+j]*g1[lhm1-tj] ;
+    }
+    x_out[ind++] = x0;
+    x_out[ind++] = x1;
+  }
+}