From c2f59a0f73c081b6d1ecbb56bf064da15ccfea85 Mon Sep 17 00:00:00 2001
From: Roman Donchenko <roman.donchenko@itseez.com>
Date: Wed, 29 Jul 2015 18:03:48 +0300
Subject: [PATCH] flann: fix AutotunedIndex crashing if a KDTree index is
 selected

Backport of mariusmuja/flann@f8ca6df3.
---
 modules/flann/include/opencv2/flann/autotuned_index.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/modules/flann/include/opencv2/flann/autotuned_index.h b/modules/flann/include/opencv2/flann/autotuned_index.h
index 43a7bcd92..454641e68 100644
--- a/modules/flann/include/opencv2/flann/autotuned_index.h
+++ b/modules/flann/include/opencv2/flann/autotuned_index.h
@@ -384,6 +384,7 @@ private:
         // evaluate kdtree for all parameter combinations
         for (size_t i = 0; i < FLANN_ARRAY_LEN(testTrees); ++i) {
             CostData cost;
+            cost.params["algorithm"] = FLANN_INDEX_KDTREE;
             cost.params["trees"] = testTrees[i];
 
             evaluate_kdtree(cost);