Draw target estimate better

Signed-off-by: Milind Upadhyay <milind.upadhyay@gmail.com>
Change-Id: Ia3f2273daecc6a9c763ada58e8003391607e85ce
diff --git a/y2022/vision/blob_detector.cc b/y2022/vision/blob_detector.cc
index 7bbd1f3..aaa22f6 100644
--- a/y2022/vision/blob_detector.cc
+++ b/y2022/vision/blob_detector.cc
@@ -226,6 +226,10 @@
                      cv::Scalar(0, 100, 0), cv::FILLED);
   }
 
+  for (const auto &blob : blob_result.filtered_blobs) {
+    cv::polylines(view_image, blob, true, cv::Scalar(0, 255, 0));
+  }
+
   static constexpr double kCircleRadius = 2.0;
   // Draw blob centroids
   for (auto stats : blob_result.blob_stats) {