diff --git a/calibration.cpp b/calibration.cpp
index 1b99e5b..de7f330 100644
--- a/calibration.cpp
+++ b/calibration.cpp
@@ -88,6 +88,8 @@ int main(int argc, char *argv[])
             // Store object and image points
             objectPoints.push_back(worldPoints);
             imagePoints.push_back(corners);
+
+            imgSize = image.size();
         }
     }