stitching: force "stable" RNG

alalek · alalek · commit 53e685461ead · 2017-03-02T13:45:12.000+03:00
diff --git a/modules/stitching/src/matchers.cpp b/modules/stitching/src/matchers.cpp
@@ -70,9 +70,12 @@ struct MatchPairsBody : ParallelLoopBody
 
     void operator ()(const Range &r) const
     {
+        cv::RNG rng = cv::theRNG(); // save entry rng state
         const int num_images = static_cast<int>(features.size());
         for (int i = r.start; i < r.end; ++i)
         {
+            cv::theRNG() = cv::RNG(rng.state + i); // force "stable" RNG seed for each processed pair
+
             int from = near_pairs[i].first;
             int to = near_pairs[i].second;
             int pair_idx = from*num_images + to;

Original file line number	Diff line number	Diff line change
`@@ -70,9 +70,12 @@ struct MatchPairsBody : ParallelLoopBody`
`70`	`70`
`71`	`71`	`void operator ()(const Range &r) const`
`72`	`72`	`{`
	`73`	`+ cv::RNG rng = cv::theRNG(); // save entry rng state`
`73`	`74`	`const int num_images = static_cast<int>(features.size());`
`74`	`75`	`for (int i = r.start; i < r.end; ++i)`
`75`	`76`	`{`
	`77`	`+ cv::theRNG() = cv::RNG(rng.state + i); // force "stable" RNG seed for each processed pair`
	`78`	`+`
`76`	`79`	`int from = near_pairs[i].first;`
`77`	`80`	`int to = near_pairs[i].second;`
`78`	`81`	`int pair_idx = from*num_images + to;`