list iterator not incremntable in c++: debug assertion

[sanjeevani]

Hi guyz,

i am new to c++ programming..and this forum ...i just hope that i am giving you all the information which will enable you to figure out the problem.

My program uses c++ and image processing toolbox "imagemagick".This program ideally should work on multiple images and gives me the centroids of white/colored dots present in the images. It does this by initially finding out regons that form a dot.It checks for regions whose pixels are white in color. the mask that it uses for doing it is a square window.Another interesting point is when I change either the window size or the threshold. it works for certain combinations.Threshold is the value that determines whether the pixel is white or balck.



QUERY: when i run my program on multiple images, it gives an error dialogue that
DEBUG ASSERTION FALIED
list operator not incrementable



the lines causing the error:

for (pointIter = dotList.begin(); pointIter != dotList.end(); pointIter++)
{ 
for (regionIter = regionList.begin(); regionIter != regionList.end(); regionIter++)
{ // Handle left/right
if (((regionIter->x == (pointIter->x + nWindowSize)) || (regionIter->x == (pointIter->x - nWindowSize)) && (regionIter->y == pointIter->y))) 
{ dotList.push_back(*regionIter);
regionIter = regionList.erase(regionIter);
}
 
if(regionIter==regionList.end())
{
break;
/*Do nothing*/
}
// Handle up/down
else if (((regionIter->y == (pointIter->y + nWindowSize)) || (regionIter->y == (pointIter->y - nWindowSize))) && (regionIter->x == pointIter->x)) 
{ dotList.push_back(*regionIter);
regionIter = regionList.erase(regionIter);
}
 
}
}

[Savage]

Hi guyz,

i am new to c++ programming..and this forum ...i just hope that i am giving you all the information which will enable you to figure out the problem.

My program uses c++ and image processing toolbox "imagemagick".This program ideally should work on multiple images and gives me the centroids of white/colored dots present in the images. It does this by initially finding out regons that form a dot.It checks for regions whose pixels are white in color. the mask that it uses for doing it is a square window.Another interesting point is when I change either the window size or the threshold. it works for certain combinations.Threshold is the value that determines whether the pixel is white or balck.



QUERY: when i run my program on multiple images, it gives an error dialogue that
DEBUG ASSERTION FALIED
list operator not incrementable



the lines causing the error:

for (pointIter = dotList.begin(); pointIter != dotList.end(); pointIter++)
{ 
  for (regionIter = regionList.begin(); regionIter != regionList.end(); regionIter++)
  {  
       // Handle left/right
      if (((regionIter->x == (pointIter->x + nWindowSize)) || (regionIter->x ==   
                    (pointIter->x - nWindowSize)) && (regionIter->y == pointIter->y))) 
      {
            dotList.push_back(*regionIter);
            regionIter = regionList.erase(regionIter);
     }
 
     if(regionIter==regionList.end())
    {
           break;
          /*Do nothing*/
    }
    // Handle up/down
     else if (((regionIter->y == (pointIter->y + nWindowSize)) || (regionIter->y ==                      
                     (pointIter->y - nWindowSize))) && (regionIter->x == pointIter->x)) 
     {
           dotList.push_back(*regionIter);
           regionIter = regionList.erase(regionIter);
    }
 
  }
}

Have you tried with preincrementation?

Savage