vision_problem_23.cc

   1 /*
   2  *  svrt is the ``Synthetic Visual Reasoning Test'', an image
   3  *  generator for evaluating classification performance of machine
   4  *  learning systems, humans and primates.
   5  *
   6  *  Copyright (c) 2009 Idiap Research Institute, http://www.idiap.ch/
   7  *  Written by Francois Fleuret <francois.fleuret@idiap.ch>
   8  *
   9  *  This file is part of svrt.
  10  *
  11  *  svrt is free software: you can redistribute it and/or modify it
  12  *  under the terms of the GNU General Public License version 3 as
  13  *  published by the Free Software Foundation.
  14  *
  15  *  svrt is distributed in the hope that it will be useful, but
  16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  *  General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License
  21  *  along with svrt.  If not, see <http://www.gnu.org/licenses/>.
  22  *
  23  */
  24
  25 #include "vision_problem_23.h"
  26 #include "shape.h"
  27
  28
  29 VisionProblem_23::VisionProblem_23() { }
  30
  31 void VisionProblem_23::generate(int label, Vignette *vignette) {
  32   int x_big, y_big, x_small, y_small;
  33   Shape big_shape, small_shape;
  34
  35   int error;
  36   do {
  37
  38     vignette->clear();
  39
  40     error = 0;
  41
  42     big_shape.randomize(big_part_size / 2, big_part_hole_size / 2);
  43
  44     do {
  45       x_big = int(drand48() * Vignette::width);
  46       y_big = int(drand48() * Vignette::height);
  47     } while(big_shape.overwrites(vignette, x_big, y_big));
  48
  49     if(!error) {
  50       big_shape.draw(vignette, x_big, y_big);
  51
  52       if(label) {
  53         // We fill outside
  54         vignette->fill(x_big, y_big, 128);
  55         vignette->switch_values(128, 255);
  56         // Find a location for a small shape inside
  57         int nb_attempts = 0;
  58         do {
  59           small_shape.randomize(small_part_size / 2, small_part_hole_size / 2);
  60           x_small = int(drand48() * Vignette::width);
  61           y_small = int(drand48() * Vignette::height);
  62           error = small_shape.overwrites(vignette, x_small, y_small);
  63           nb_attempts++;
  64         } while(error && nb_attempts < 10);
  65
  66         if(!error) {
  67           // Found it, unfill outside, fill inside and draw
  68           vignette->replace_value(128, 255);
  69           vignette->fill(x_big, y_big, 128);
  70
  71           small_shape.draw(vignette, x_small, y_small);
  72
  73           int nb_attempts = 0;
  74           do {
  75             small_shape.randomize(small_part_size / 2, small_part_hole_size / 2);
  76             x_small = int(drand48() * Vignette::width);
  77             y_small = int(drand48() * Vignette::height);
  78             error = small_shape.overwrites(vignette, x_small, y_small);
  79             nb_attempts++;
  80           } while(error && nb_attempts < 10);
  81           if(!error) {
  82             // Found it, unfill and draw
  83             vignette->replace_value(128, 255);
  84             small_shape.draw(vignette, x_small, y_small);
  85           }
  86         }
  87       } else {
  88         vignette->fill(x_big, y_big, 128);
  89
  90         if(drand48() < 0.5) {
  91           vignette->switch_values(128, 255);
  92         }
  93
  94         int nb_attempts = 0;
  95         do {
  96           small_shape.randomize(small_part_size / 2, small_part_hole_size / 2);
  97           x_small = int(drand48() * Vignette::width);
  98           y_small = int(drand48() * Vignette::height);
  99           error = small_shape.overwrites(vignette, x_small, y_small);
 100           nb_attempts++;
 101         } while(error && nb_attempts < 10);
 102
 103         if(!error) {
 104           small_shape.draw(vignette, x_small, y_small);
 105           vignette->fill(x_small, y_small, 128);
 106           int nb_attempts = 0;
 107           do {
 108             small_shape.randomize(small_part_size / 2, small_part_hole_size / 2);
 109             x_small = int(drand48() * Vignette::width);
 110             y_small = int(drand48() * Vignette::height);
 111             error = small_shape.overwrites(vignette, x_small, y_small);
 112             nb_attempts++;
 113           } while(error && nb_attempts < 10);
 114
 115           if(!error) {
 116             small_shape.draw(vignette, x_small, y_small);
 117             vignette->replace_value(128, 255);
 118           }
 119         }
 120       }
 121
 122     }
 123
 124   } while(error);
 125 }