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Tina5/tina-libs/tina/image/imgPrc_aratio.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_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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