From cb3711d51d79b99cfb9b2bae71cdd4b7d97d937c Mon Sep 17 00:00:00 2001
From: Maria Dimashova <no@email>
Date: Thu, 11 Nov 2010 16:06:22 +0000
Subject: [PATCH] fixed SURF::operator() (#423)

---
 modules/features2d/src/surf.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/modules/features2d/src/surf.cpp b/modules/features2d/src/surf.cpp
index 5552ed3e1..5a184684e 100644
--- a/modules/features2d/src/surf.cpp
+++ b/modules/features2d/src/surf.cpp
@@ -890,7 +890,9 @@ void SURF::operator()(const Mat& img, const Mat& mask,
     
     cvExtractSURF(&_img, pmask, &kp.seq, &d, storage,
         *(const CvSURFParams*)this, useProvidedKeypoints);
-    if( !useProvidedKeypoints )
+
+    // input keypoints can be filtered in cvExtractSURF()
+    if( !useProvidedKeypoints || (useProvidedKeypoints && keypoints.size() != kp.size()) )
     {
         Seq<CvSURFPoint>::iterator it = kp.begin();
         size_t i, n = kp.size();