From 8a1d3929cc48f32455f9980cefb2ef8a46d81274 Mon Sep 17 00:00:00 2001
From: Dmitry Gribanov <dmitry.gribanov@itseez.com>
Date: Mon, 15 Sep 2014 17:04:08 +0400
Subject: [PATCH] Feature based stitching's wave correction bugfix.

When we have similar matrices in input, then algorithm returns matrices
with NaN values.
---
 modules/stitching/src/motion_estimators.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/modules/stitching/src/motion_estimators.cpp b/modules/stitching/src/motion_estimators.cpp
index 2ba691b7d..5ae14b7e9 100644
--- a/modules/stitching/src/motion_estimators.cpp
+++ b/modules/stitching/src/motion_estimators.cpp
@@ -616,7 +616,14 @@ void waveCorrect(vector<Mat> &rmats, WaveCorrectKind kind)
     for (size_t i = 0; i < rmats.size(); ++i)
         img_k += rmats[i].col(2);
     Mat rg0 = rg1.cross(img_k);
-    rg0 /= norm(rg0);
+    double rg0_norm = norm(rg0);
+
+    if( rg0_norm <= DBL_MIN )
+    {
+        return;
+    }
+
+    rg0 /= rg0_norm;
 
     Mat rg2 = rg0.cross(rg1);