From d5af311a773f5105c9cdd236e570690828cc8d86 Mon Sep 17 00:00:00 2001
From: Vadim Pisarevsky <no@email>
Date: Wed, 1 Jun 2011 13:15:43 +0000
Subject: [PATCH] fix bilateral filter behavior when color_sigma == 0 and/or
 spatial_sigma == 0 (ticket #469)

---
 modules/imgproc/src/smooth.cpp | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/modules/imgproc/src/smooth.cpp b/modules/imgproc/src/smooth.cpp
index b9f93262ad..6c34a7c19f 100644
--- a/modules/imgproc/src/smooth.cpp
+++ b/modules/imgproc/src/smooth.cpp
@@ -1288,8 +1288,6 @@ bilateralFilter_8u( const Mat& src, Mat& dst, int d,
                     double sigma_color, double sigma_space,
                     int borderType )
 {
-    double gauss_color_coeff = -0.5/(sigma_color*sigma_color);
-    double gauss_space_coeff = -0.5/(sigma_space*sigma_space);
     int cn = src.channels();
     int i, j, k, maxk, radius;
     Size size = src.size();
@@ -1302,6 +1300,9 @@ bilateralFilter_8u( const Mat& src, Mat& dst, int d,
         sigma_color = 1;
     if( sigma_space <= 0 )
         sigma_space = 1;
+    
+    double gauss_color_coeff = -0.5/(sigma_color*sigma_color);
+    double gauss_space_coeff = -0.5/(sigma_space*sigma_space);
 
     if( d <= 0 )
         radius = cvRound(sigma_space*1.5);
@@ -1389,8 +1390,6 @@ bilateralFilter_32f( const Mat& src, Mat& dst, int d,
                      double sigma_color, double sigma_space,
                      int borderType )
 {
-    double gauss_color_coeff = -0.5/(sigma_color*sigma_color);
-    double gauss_space_coeff = -0.5/(sigma_space*sigma_space);
     int cn = src.channels();
     int i, j, k, maxk, radius;
     double minValSrc=-1, maxValSrc=1;
@@ -1408,6 +1407,9 @@ bilateralFilter_32f( const Mat& src, Mat& dst, int d,
         sigma_color = 1;
     if( sigma_space <= 0 )
         sigma_space = 1;
+    
+    double gauss_color_coeff = -0.5/(sigma_color*sigma_color);
+    double gauss_space_coeff = -0.5/(sigma_space*sigma_space);
 
     if( d <= 0 )
         radius = cvRound(sigma_space*1.5);