From 1c180f4c7f20c2f4dfb168c33d76c5ee1b6159c0 Mon Sep 17 00:00:00 2001
From: Alexander Alekhin <alexander.a.alekhin@gmail.com>
Date: Mon, 29 Apr 2019 21:11:27 +0000
Subject: [PATCH] imgproc: fix RemoveOverlaps() with empty input vector

---
 modules/imgproc/src/hough.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/modules/imgproc/src/hough.cpp b/modules/imgproc/src/hough.cpp
index eb4acdad49..5862319738 100644
--- a/modules/imgproc/src/hough.cpp
+++ b/modules/imgproc/src/hough.cpp
@@ -1355,6 +1355,8 @@ static void GetCircleCenters(const std::vector<int> &centers, std::vector<Vec4f>
 template<typename T>
 static void RemoveOverlaps(std::vector<T>& circles, float minDist)
 {
+    if (circles.size() <= 1u)
+        return;
     float minDist2 = minDist * minDist;
     size_t endIdx = 1;
     for (size_t i = 1; i < circles.size(); ++i)