Fix segfaults

Author: jkflying

src/extract/extract_image.cpp

@@ -17,11 +17,6 @@ namespace
 {
 cv::Mat load_image(const std::string &path)
 {
-    if (cv::getNumThreads() != 1)
-    {
-        cv::setNumThreads(1);
-    }
-
     return cv::imread(path); //, cv::IMREAD_IGNORE_ORIENTATION | cv::IMREAD_COLOR);
 }
 } // namespace

src/ortho/image_cache.cpp

@@ -34,11 +34,6 @@ cv::Mat FullResolutionImageCache::getImage(size_t node_id, const std::string &pa
     cache_misses_++;
     lock.unlock();
 
-    if (cv::getNumThreads() != 1)
-    {
-        cv::setNumThreads(1);
-    }
-
     cv::Mat image = cv::imread(path);
 
     lock.lock();

src/pipeline/pipeline.cpp

@@ -116,6 +116,7 @@ struct Pipeline::Impl : public usm::StateMachine<PipelineState, PipelineTransiti
           link_stage(new LinkStage()), relax_stage(new RelaxStage()), step_callback([](const StepCompletionInfo &) {}),
           batch_size(batch_size_), parallelism(parallelism_ == 0 ? omp_get_num_procs() : parallelism_)
     {
+        cv::setNumThreads(1);
     }
 
     PipelineState chooseNextState(PipelineState currentState, Transition transition) override;