CaptchaBreak_p4.cpp

//Make good representation for clustering
Mat points = Mat::zeros(sum(img_zeroone)[0], 2, CV_32F);
for (int i = 0, k = 0; i < img_zeroone.rows; i++){
  for (int j = 0; j < img_zeroone.cols; j++){
    if ((int)img_zeroone.at<char>(i, j) == 255){
      points.at<float>(k, 0) = i;
      points.at<float>(k, 1) = j;
      k++;
    }
  }
}
Mat kCenters, kLabels;  //Clustering
int clusterCount = 5, attempts = 10, iterationNumber = 1e40;
kmeans(points, clusterCount, kLabels, TermCriteria(CV_TERMCRIT_ITER | CV_TERMCRIT_EPS, iterationNumber, 1e-4), attempts, KMEANS_PP_CENTERS, kCenters);
for (int i = 0; i < kCenters.rows; i++){
  float x = kCenters.at<float>(i, 1), y = kCenters.at<float>(i, 0);
  circle(img_sharp_not, Point(x, y), 2, (0, 0, 255), -1);
  rectangle(img_sharp_not, Rect(x - 13, y - 13, 26, 26), Scalar(255, 255, 255));
}