From fa27fe2ba297ce93b12bbb048fcf063e840cf045 Mon Sep 17 00:00:00 2001
From: berak <px1704@web.de>
Date: Thu, 6 Oct 2016 08:58:24 +0200
Subject: [PATCH] face: fix NaN's in bif.cpp

---
 modules/face/src/bif.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/modules/face/src/bif.cpp b/modules/face/src/bif.cpp
index 137e76813..3e0611de7 100644
--- a/modules/face/src/bif.cpp
+++ b/modules/face/src/bif.cpp
@@ -201,8 +201,8 @@ void BIFImpl::computeUnit(int unit_idx, const cv::Mat &img,
             int x1 = std::min(resp.cols, xc + Whalf);
             int area = (y1-y0) * (x1-x0);
 
-            float mean = sum.at<float>(y1,x1) - sum.at<float>(y1,x0)
-                         - sum.at<float>(y0,x1) + sum.at<float>(y0,x0);
+            double mean = sum.at<double>(y1,x1) - sum.at<double>(y1,x0)
+                         - sum.at<double>(y0,x1) + sum.at<double>(y0,x0);
             mean /= area;
 
             double sd = sumsq.at<double>(y1,x1) - sumsq.at<double>(y1,x0)