Detecting regions hierarchically. Starting with the biggest boxes, and then moving into their children if the bigger box was not detected.

src/openalpr/alpr_impl.cpp

@@ -159,7 +159,6 @@ void plateAnalysisThread(void* arg)
     if (dispatcher->hasPlate() == false)
       break;
     
-    // Synchronized section
     if (dispatcher->config->debugGeneral)
       cout << "Thread: " << tthread::this_thread::get_id() << " loop " << ++loop_count << endl;
     
@@ -168,8 +167,6 @@ void plateAnalysisThread(void* arg)
     
     Mat img = dispatcher->getImageCopy();
 
-  
-    // Parallel section
     timespec platestarttime;
     getTime(&platestarttime);
     
@@ -178,7 +175,16 @@ void plateAnalysisThread(void* arg)
     lp.recognize();
 
     
-      if (lp.confidence > 10)
+    if (lp.confidence <= 10)
+    {
+      // Not a valid plate
+      // Check if this plate has any children, if so, send them back up to the dispatcher for processing
+      for (int childidx = 0; childidx < plateRegion.children.size(); childidx++)
+      {
+	dispatcher->appendPlate(plateRegion.children[childidx]);
+      }
+    }
+    else
     {
       AlprResult plateResult;
       plateResult.region = dispatcher->defaultRegion;
@@ -245,9 +251,10 @@ void plateAnalysisThread(void* arg)
 	
       }
       
-	
     }
       
+    
+      
     if (dispatcher->config->debugTiming)
     {
       timespec plateEndTime;
@@ -255,6 +262,7 @@ void plateAnalysisThread(void* arg)
       cout << "Thread: " << tthread::this_thread::get_id() << " Finished loop " << loop_count << " in " << diffclock(platestarttime, plateEndTime) << "ms." << endl;
     }
       
+      
   }
 
   if (dispatcher->config->debugGeneral)

src/openalpr/alpr_impl.h

@@ -123,6 +123,13 @@ class PlateDispatcher
       return plateRegion;
     }
     
+    void appendPlate(PlateRegion plate)
+    {
+      tthread::lock_guard<tthread::mutex> guard(mMutex);
+      
+      plateRegions.push_back(plate);
+    }
+    
     void addResult(AlprResult recognitionResult)
     {
       tthread::lock_guard<tthread::mutex> guard(mMutex);