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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