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_aratio.c,v $
37 * Date : $Date: 2003/09/30 16:53:49 $
38 * Version : $Revision: 1.6 $
39 * CVS Id : $Id: imgPrc_aratio.c,v 1.6 2003/09/30 16:53:49 ipoole Exp $
40 *
41 * Author : Legacy TINA
42 */
43
44 /**
45 * @file
46 * @brief Image re-samping in x or y using linear interpolation.
47 *
48 * Suitable for tasks such as decimation by a factor of 2, where the new pixel is the
49 * average of two adjacent values.
50 *
51 */
52
53 #include "imgPrc_aratio.h"
54
55 #if HAVE_CONFIG_H
56 #include <config.h>
57 #endif
58
59 #include <math.h>
60 #include <tina/sys/sysDef.h>
61 #include <tina/sys/sysPro.h>
62 #include <tina/math/mathDef.h>
63 #include <tina/math/mathPro.h>
64 #include <tina/image/img_GenDef.h>
65 #include <tina/image/img_GenPro.h>
66
67 Imrect *imf_aratio(double k, Imrect * im)
68 {
69 Imrect *im2;
70 int width, height;
71 double x, y;
72
73 width = im->width;
74 height = (int) (k * im->height);
75
76 im2 = im_alloc(height, width, (Imregion *) NULL, float_v);
77
78 for (x = 0.5; x < width; x++)
79 for (y = 0.5; y < height; y++)
80 {
81 double pixval;
82
83 pixval = im_sub_pixf(im, y / k, x);
84 im_put_pixf(pixval, im2, tina_int(y), tina_int(x));
85 }
86
87 return (im2);
88 }
89
90 Imrect *imf_bratio(double k, Imrect * im)
91 {
92 Imrect *im2;
93 int width, height;
94 double x, y;
95
96 width = (int) (k * im->width);
97 height = im->height;
98
99 im2 = im_alloc(height, width, (Imregion *) NULL, float_v);
100
101 for (x = 0.5; x < width; x++)
102 for (y = 0.5; y < height; y++)
103 {
104 double pixval;
105
106 pixval = im_sub_pixf(im, y, x / k);
107 im_put_pixf(pixval, im2, tina_int(y), tina_int(x));
108 }
109
110 return (im2);
111 }
112
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