message: calib3d: chess board - perform full range (with 0) histogram smooth
diff: @@ -252,7 +252,7 @@ static int icvSmoothHistogram( const std::vector<int>& piHist, std::vector<int>&
  for ( int ii=-iWidth; ii<=iWidth; ii++)
  {
  iIdx = i+ii;
  - if (iIdx > 0 && iIdx < 256)
  + if (iIdx >= 0 && iIdx < 256)
  {
  iSmooth += piHist[iIdx];
  }
  