From 737444539831e1094463801c6d5f59ee464a01ad Mon Sep 17 00:00:00 2001
From: Andrey Kamaev <andrey.kamaev@itseez.com>
Date: Mon, 28 Jan 2013 14:30:06 +0400
Subject: [PATCH] Fix integer overflow in NL-Means denoising on white input

Issues #2646
---
 modules/photo/src/fast_nlmeans_denoising_invoker.hpp       | 2 +-
 modules/photo/src/fast_nlmeans_multi_denoising_invoker.hpp | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/modules/photo/src/fast_nlmeans_denoising_invoker.hpp b/modules/photo/src/fast_nlmeans_denoising_invoker.hpp
index 1dcb6b3ec..c4f13826d 100644
--- a/modules/photo/src/fast_nlmeans_denoising_invoker.hpp
+++ b/modules/photo/src/fast_nlmeans_denoising_invoker.hpp
@@ -257,7 +257,7 @@ void FastNlMeansDenoisingInvoker<T>::operator() (const BlockedRange& range) cons
             }
 
             for (size_t channel_num = 0; channel_num < sizeof(T); channel_num++)
-                estimation[channel_num] = (estimation[channel_num] + weights_sum/2) / weights_sum;
+                estimation[channel_num] = ((unsigned)estimation[channel_num] + weights_sum/2) / weights_sum;
 
             dst_.at<T>(i,j) = saturateCastFromArray<T>(estimation);
         }
diff --git a/modules/photo/src/fast_nlmeans_multi_denoising_invoker.hpp b/modules/photo/src/fast_nlmeans_multi_denoising_invoker.hpp
index 870760b48..2ae5054e0 100644
--- a/modules/photo/src/fast_nlmeans_multi_denoising_invoker.hpp
+++ b/modules/photo/src/fast_nlmeans_multi_denoising_invoker.hpp
@@ -287,7 +287,7 @@ void FastNlMeansMultiDenoisingInvoker<T>::operator() (const BlockedRange& range)
             }
 
             for (size_t channel_num = 0; channel_num < sizeof(T); channel_num++)
-                estimation[channel_num] = (estimation[channel_num] + weights_sum / 2) / weights_sum;
+                estimation[channel_num] = ((unsigned)estimation[channel_num] + weights_sum / 2) / weights_sum;
 
             dst_.at<T>(i,j) = saturateCastFromArray<T>(estimation);