psycho-skin-resize.h

00001 /*!@file AppPsycho/psycho-skin-indexing.C Psychophysics support for psycho-skin-indexing.h */
00002 
00003 // //////////////////////////////////////////////////////////////////// //
00004 // The iLab Neuromorphic Vision C++ Toolkit - Copyright (C) 2001 by the //
00005 // University of Southern California (USC) and the iLab at USC.         //
00006 // See http://iLab.usc.edu for information about this project.          //
00007 // //////////////////////////////////////////////////////////////////// //
00008 // Major portions of the iLab Neuromorphic Vision Toolkit are protected //
00009 // under the U.S. patent ``Computation of Intrinsic Perceptual Saliency //
00010 // in Visual Environments, and Applications'' by Christof Koch and      //
00011 // Laurent Itti, California Institute of Technology, 2001 (patent       //
00012 // pending; application number 09/912,225 filed July 23, 2001; see      //
00013 // http://pair.uspto.gov/cgi-bin/final/home.pl for current status).     //
00014 // //////////////////////////////////////////////////////////////////// //
00015 // This file is part of the iLab Neuromorphic Vision C++ Toolkit.       //
00016 //                                                                      //
00017 // The iLab Neuromorphic Vision C++ Toolkit is free software; you can   //
00018 // redistribute it and/or modify it under the terms of the GNU General  //
00019 // Public License as published by the Free Software Foundation; either  //
00020 // version 2 of the License, or (at your option) any later version.     //
00021 //                                                                      //
00022 // The iLab Neuromorphic Vision C++ Toolkit is distributed in the hope  //
00023 // that it will be useful, but WITHOUT ANY WARRANTY; without even the   //
00024 // implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      //
00025 // PURPOSE.  See the GNU General Public License for more details.       //
00026 //                                                                      //
00027 // You should have received a copy of the GNU General Public License    //
00028 // along with the iLab Neuromorphic Vision C++ Toolkit; if not, write   //
00029 // to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,   //
00030 // Boston, MA 02111-1307 USA.                                           //
00031 // //////////////////////////////////////////////////////////////////// //
00032 //
00033 // Primary maintainer for this file: Laurent Itti <itti@usc.edu>
00034 // $HeadURL: svn://isvn.usc.edu/software/invt/trunk/saliency/src/AppPsycho/psycho-skin-resize.h $
00035 // $Id: psycho-skin-resize.h 10794 2009-02-08 06:21:09Z itti $
00036 //
00037 
00038 //resize.c - has all you need to get high-quality interpolated image scaling - up & down!
00039 //please see resize.c for more information about who has contributed to this library
00040 
00041 #ifndef __RESIZE_FILTERS__
00042 #define __RESIZE_FILTERS__
00043 
00044 #include <SDL/SDL.h>
00045 
00046 //Here are the only 2 functions you need:
00047 //NULL will be returned if the passed in surface "image" is invalid
00048 SDL_Surface* SDL_ResizeFactor(SDL_Surface *image, float scalefactor,    int filter);
00049 SDL_Surface* SDL_ResizeXY    (SDL_Surface *image, int new_w, int new_h, int filter);
00050 
00051 //Here are overloaded C++ versions, with filter default as high quality.
00052 #ifdef __cplusplus
00053 SDL_Surface* SDL_Resize(SDL_Surface *image, float scalefactor,    int filter = 7);
00054 SDL_Surface* SDL_Resize(SDL_Surface *image, int new_w, int new_h, int filter = 7);
00055 #endif
00056 
00057 /*The passed-in surface is freed by SDL_Resize, so it works nicely to pass in surfaces
00058   as themselves:
00059   e.g. pic = SDL_ResizeFactor(pic, 0.75, 7); (or pic = SDL_Resize(pic, 0.75);)
00060   This will shrink pic to 75% of original size. No other cleanup necessary.
00061   Another good way to use it is on initialization:
00062   e.g. SDL_Surface *pic = SDL_ResizeXY(SDL_LoadBMP("mypic.bmp"),50,50,7);
00063   This will give you mypic.png at size 50x50(regardless of original dimensions)
00064   if mypic.bmp did not load correctly, pic will be NULL.
00065 */
00066 
00067 /*
00068 Filters are as follows:
00069 1 = box filter - fastest/ugliest.
00070 2 =        triangle filter - possible visual anomalies
00071 3 = bell filter - possible visual anomalies
00072 4 = B_spline filter - here is where it starts to get good.
00073 5 =        hermite filter - relatively fast, good quality
00074 6 =        Mitchell filter - also speedy, good quality
00075 7 = Lanczos3 filter - slowest, but by far best quality. Very sharp!
00076 If filter is not specified, Lanczos3 will be selected by default
00077 */
00078 
00079 /*The code should compile as either C or C++, without any fuss, except maybe you specifying
00080   which kind to compile it as... -Dave Olsen
00081 */
00082 
00083 #endif
00084 
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