diff --git a/y2022/vision/blob_detector.cc b/y2022/vision/blob_detector.cc
index aaa22f6..873cf43 100644
--- a/y2022/vision/blob_detector.cc
+++ b/y2022/vision/blob_detector.cc
@@ -13,7 +13,7 @@
 
 DEFINE_uint64(red_delta, 100,
               "Required difference between green pixels vs. red");
-DEFINE_uint64(blue_delta, 30,
+DEFINE_uint64(blue_delta, 1,
               "Required difference between green pixels vs. blue");
 
 DEFINE_bool(use_outdoors, false,
@@ -52,6 +52,14 @@
     }
   }
 
+  // Fill in the contours on the binarized image so that we don't detect
+  // multiple blobs in one
+  const auto blobs = FindBlobs(binarized_image);
+  for (auto it = blobs.begin(); it < blobs.end(); it++) {
+    cv::drawContours(binarized_image, blobs, it - blobs.begin(),
+                     cv::Scalar(255), cv::FILLED);
+  }
+
   return binarized_image;
 }
 
diff --git a/y2022/vision/viewer.cc b/y2022/vision/viewer.cc
index 24c8fc6..f847dbd 100644
--- a/y2022/vision/viewer.cc
+++ b/y2022/vision/viewer.cc
@@ -212,7 +212,7 @@
 
   TargetEstimator estimator(intrinsics, extrinsics);
 
-  for (auto it = file_list.begin() + FLAGS_skip; it != file_list.end(); it++) {
+  for (auto it = file_list.begin() + FLAGS_skip; it < file_list.end(); it++) {
     LOG(INFO) << "Reading file " << *it;
     cv::Mat image_mat = cv::imread(it->c_str());
     BlobDetector::BlobResult blob_result;