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Tina6/tina-libs/tina/image/imgPrc_smooth.c

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  1 /**********
  2  *
  3  * Copyright (c) 2003, Division of Imaging Science and Biomedical Engineering,
  4  * University of Manchester, UK.  All rights reserved.
  5  * 
  6  * Redistribution and use in source and binary forms, with or without modification, 
  7  * are permitted provided that the following conditions are met:
  8  * 
  9  *   . Redistributions of source code must retain the above copyright notice, 
 10  *     this list of conditions and the following disclaimer.
 11  *    
 12  *   . Redistributions in binary form must reproduce the above copyright notice,
 13  *     this list of conditions and the following disclaimer in the documentation 
 14  *     and/or other materials provided with the distribution.
 15  * 
 16  *   . Neither the name of the University of Manchester nor the names of its
 17  *     contributors may be used to endorse or promote products derived from this 
 18  *     software without specific prior written permission.
 19  * 
 20  * 
 21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 22  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
 25  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 31  * POSSIBILITY OF SUCH DAMAGE.
 32  *
 33  **********
 34  *
 35  * Program :    TINA
 36  * File    :  $Source: /home/tina/cvs/tina-libs/tina/image/imgPrc_smooth.c,v $
 37  * Date    :  $Date: 2008/10/30 09:43:59 $
 38  * Version :  $Revision: 1.7 $
 39  * CVS Id  :  $Id: imgPrc_smooth.c,v 1.7 2008/10/30 09:43:59 neil Exp $
 40  *
 41  * Author  : Legacy TINA
 42  */
 43 
 44 /** 
 45  *  @file
 46  *  @brief Tangential (edge preserving) smoothing.
 47  *
 48  */
 49 
 50 #include "imgPrc_smooth.h"
 51 
 52 #if HAVE_CONFIG_H
 53 #include <config.h>
 54 #endif
 55 
 56 #include <math.h>
 57 #include <tina/sys/sysDef.h>
 58 #include <tina/sys/sysPro.h>
 59 #include <tina/math/mathDef.h>
 60 #include <tina/math/mathPro.h>
 61 #include <tina/image/img_GenDef.h>
 62 #include <tina/image/img_GenPro.h>
 63 
 64 Imrect         *im_tsmooth(Imrect * im1)
 65 {
 66         Imrect         *im2;
 67         int             ix, iy;
 68         Imregion       *roi;
 69 
 70         if (im1 == NULL)
 71                 return (NULL);
 72 
 73         im2 = im_alloc(im1->height, im1->width, im1->region, float_v);
 74         roi = im1->region;
 75         for (ix = roi->lx; ix < roi->ux; ix++)
 76                 for (iy = roi->ly; iy < roi->uy; iy++)
 77                 {
 78                         double          v0, v2, nx, ny, n;
 79                         double          x = ix + 0.5;
 80                         double          y = iy + 0.5;
 81 
 82                         nx = im_sub_pixf(im1, y, x + 0.5) - im_sub_pixf(im1, y, x - 0.5);
 83                         ny = im_sub_pixf(im1, y + 0.5, x) - im_sub_pixf(im1, y - 0.5, x);
 84                         n = sqrt(nx * nx + ny * ny);
 85                         if (n == 0.0)
 86                                 n = 1.0;
 87                         else
 88                         {
 89                                 nx /= n;
 90                                 ny /= n;
 91                         }
 92                         v0 = im_sub_pixf(im1, y + nx, x - ny);
 93                         v2 = im_sub_pixf(im1, y - nx, x + ny);
 94                         IM_PIX_SET(im2, iy, ix, 0.5 * (v0 + v2));
 95                 }
 96         return (im2);
 97 }
 98 

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