Segmentation fault (core dumped) image processing c++/opencv

edited April 2016 in Questions about Code

I want to apply a smooth to an image,for that purpose I create the function "sum" Here's my code

double sum(cv::Mat img, int startedX, int startedY, int w) {
  double res = 0;
  std::cout << "startedX= " << startedX << "/ startedY= " << startedY <<  std::endl; 
  for (int i = startedX - ((w - 1) / 2); i < startedX + ((w + 1) / 2); i++) {
    std::cout << "i= " << i <<  std::endl;    
    for (int j = startedY - ((w - 1) / 2) ; j < startedY + ((w + 1) / 2); j++) {
      std::cout << " j= " << j <<  std::endl;
      if ((i >= 0 && i < img.size().width) && (j >= 0  && j < img.size().height)) {      
        res += img.at<float>(i,j);
      }
    }
  }
  return res;
}

This is a portion of my main function where the program crashes :

for (int k = 0; k < imgSource.size().width; k++) {
  for (int l = 0; l < imgSource.size().height; l++) {
    if( (k >= 0 && k < imgSource.size().width) && (l >= 0  && l < imgSource.size().height) ) {
      std::cout << "k= " << k <<"  l= " << l << " wmax= " << wmax << std::endl; 
      newImgMax.at<float>(k,l) =(float)sum(imgMax, k, l, wmax) / (wmax * wmax);
    }
  }
}

for k=0 and l=0 the program works fine and returns a value but for k=0 and l=1 the call of the function(sum(imgMax,0,1,1)) doesn't pass,it crashes and shows a segmentation fault core dumped.This is my output:

k= 0  l= 0 wmax= 1
startedX= 0/ startedY= 0
i= 0
j= 0
k= 0  l= 1 wmax= 1
Segmentation fault (core dumped)
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