ExampleInterpolation.cpp

Example for image interpolation with bicubic, bilinear

Author

MIP

/* 
This file is part of the BIAS library (Basic ImageAlgorithmS).

Copyright (C) 2003-2009    (see file CONTACT for details)
  Multimediale Systeme der Informationsverarbeitung
  Institut fuer Informatik
  Christian-Albrechts-Universitaet Kiel


BIAS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

BIAS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with BIAS; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/


/**
   @example ExampleInterpolation.cpp
   @relates Image
   @brief Example for image interpolation with bicubic, bilinear
   @ingroup g_examples
   @author MIP
*/
#include <Base/Image/Image.hh>
#include <Base/Image/ImageIO.hh>

#define OFFX 0.3
#define OFFY 0.2

using namespace BIAS;
using namespace std;

int main(int argc, char *argv[])
{

  if (argc<2){
    BIASERR(argv[0]<<" <image-file>");
    return -1;
  }
 
  Image<unsigned char> im;
  if (ImageIO::Load(argv[1], im)!=0){
    BIASERR("error loading "<<argv[1]);
    return -2;
  }
  Image<unsigned char> imcubic(im.GetWidth(),im.GetHeight(),
                               im.GetChannelCount());

  Image<unsigned char> imbilinear(im.GetWidth(),im.GetHeight(),
                                  im.GetChannelCount());

  
  unsigned char **pDc = imcubic.GetImageDataArray();
  unsigned char **pDb = imbilinear.GetImageDataArray();

  double CurValue = 0;
  const unsigned int channelcount = im.GetChannelCount();
  for (unsigned int x=2; x<im.GetWidth()-3; x++) {
    for (unsigned int y=2; y<im.GetHeight()-3; y++) {
      for (unsigned int c=0; c<channelcount; c++) {
        CurValue = rint(im.BicubicInterpolation(double(x)+double(OFFX),
                                                double(y)+double(OFFY), 
                                                (unsigned short)(c) )
                                                );
        if (CurValue<0.0)CurValue = 0.0;
        if (CurValue>255.0)CurValue = 255.0;
        pDc[y][(x*channelcount)+c] = (unsigned char) CurValue; 
        CurValue = rint(im.BilinearInterpolation(double(x)+double(OFFX),
                                                 double(y)+double(OFFY),
                                                 (unsigned short)(c) )
                                                 );
        if (CurValue<0.0)CurValue = 0.0;
        if (CurValue>255.0)CurValue = 255.0;
        pDb[y][(x*channelcount)+c] = (unsigned char) CurValue;
      }
    }
  }

  //if (ImageIO::Save("image_bicubic.mip", imcubic)!=0){
  if (ImageIO::Save("image_bicubic.mip", imcubic)!=0){
    BIASERR("error writing cubic image");
    return -3;
  }
  //if (ImageIO::Save("image_bilinear.mip", imbilinear)!=0){
  if (ImageIO::Save("image_bilinear.mip", imbilinear)!=0){
    BIASERR("error writing bilinear image");
    return -3;
  }
  return 0;
}