From 64f02aa72d730fbf68b33e7b97f13fc2225889ea Mon Sep 17 00:00:00 2001
From: Vitaly Tuzov <vitaly.tuzov@itseez.com>
Date: Tue, 29 Mar 2016 17:59:48 +0300
Subject: [PATCH] Backport of setRNGSeed implementation and python test
 randomness fix

---
 modules/core/include/opencv2/core/core.hpp | 3 +++
 modules/core/src/rand.cpp                  | 5 +++++
 modules/python/test/tests_common.py        | 1 +
 3 files changed, 9 insertions(+)

diff --git a/modules/core/include/opencv2/core/core.hpp b/modules/core/include/opencv2/core/core.hpp
index 488e3e9840..591d50ade6 100644
--- a/modules/core/include/opencv2/core/core.hpp
+++ b/modules/core/include/opencv2/core/core.hpp
@@ -2593,6 +2593,9 @@ CV_EXPORTS_W double kmeans( InputArray data, int K, CV_OUT InputOutputArray best
 //! returns the thread-local Random number generator
 CV_EXPORTS RNG& theRNG();
 
+//! sets state of the thread-local Random number generator
+CV_EXPORTS_W void setRNGSeed(int seed);
+
 //! returns the next unifomly-distributed random number of the specified type
 template<typename _Tp> static inline _Tp randu() { return (_Tp)theRNG(); }
 
diff --git a/modules/core/src/rand.cpp b/modules/core/src/rand.cpp
index 54bb753a15..73dff184b5 100644
--- a/modules/core/src/rand.cpp
+++ b/modules/core/src/rand.cpp
@@ -806,6 +806,11 @@ RNG& theRNG()
 
 }
 
+void cv::setRNGSeed(int seed)
+{
+    theRNG() = RNG(static_cast<uint64>(seed));
+}
+
 void cv::randu(InputOutputArray dst, InputArray low, InputArray high)
 {
     theRNG().fill(dst, RNG::UNIFORM, low, high);
diff --git a/modules/python/test/tests_common.py b/modules/python/test/tests_common.py
index 3a636b255c..67b5bea2f7 100644
--- a/modules/python/test/tests_common.py
+++ b/modules/python/test/tests_common.py
@@ -42,6 +42,7 @@ class NewOpenCVTests(unittest.TestCase):
         return self.image_cache[filename]
 
     def setUp(self):
+        cv2.setRNGSeed(10)
         self.image_cache = {}
 
     def hashimg(self, im):
-- 
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