From 5460cee9e96bf7e64a09cf8fd9cd81fc05ecef04 Mon Sep 17 00:00:00 2001
From: "marina.kolpakova" <marina.kolpakova@itseez.com>
Date: Sun, 25 Nov 2012 03:19:24 +0400
Subject: [PATCH] fix cascade classifier GFF NMS for empty candidates vector

---
 modules/gpu/src/cuda/lbp.cu | 1 +
 1 file changed, 1 insertion(+)

diff --git a/modules/gpu/src/cuda/lbp.cu b/modules/gpu/src/cuda/lbp.cu
index 9b729fe63..55f5d7512 100644
--- a/modules/gpu/src/cuda/lbp.cu
+++ b/modules/gpu/src/cuda/lbp.cu
@@ -185,6 +185,7 @@ namespace cv { namespace gpu { namespace device
 
         void connectedConmonents(PtrStepSz<int4> candidates, int ncandidates, PtrStepSz<int4> objects, int groupThreshold, float grouping_eps, unsigned int* nclasses)
         {
+            if (!ncandidates) return;
             int block = ncandidates;
             int smem  = block * ( sizeof(int) + sizeof(int4) );
             disjoin<InSameComponint><<<1, block, smem>>>(candidates, objects, ncandidates, groupThreshold, grouping_eps, nclasses);