From 1a25e58239facb290f8f4ecd1e5d3e612a7afc0f Mon Sep 17 00:00:00 2001
From: Vadim Pisarevsky <no@email>
Date: Wed, 7 Mar 2012 13:35:13 +0000
Subject: [PATCH] fixed patch diff calculation in the end of
 calcopticalflowpyrlk (thanks to Vlad Vinogradov for the patch)

---
 modules/video/src/lkpyramid.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/modules/video/src/lkpyramid.cpp b/modules/video/src/lkpyramid.cpp
index 19d5aede9a..5392374d10 100644
--- a/modules/video/src/lkpyramid.cpp
+++ b/modules/video/src/lkpyramid.cpp
@@ -436,7 +436,7 @@ struct LKTrackerInvoker
             
             if( status[ptidx] && err && level == 0 && (flags & CV_LKFLOW_GET_MIN_EIGENVALS) == 0 )
             {
-                Point2f nextPt = nextPts[ptidx];
+                Point2f nextPt = nextPts[ptidx] - halfWin;
                 Point inextPt;
                 
                 inextPt.x = cvFloor(nextPt.x);