Resolves issue #150 Automatically apply pattern matching for countries with only one pattern

src/openalpr/alpr_impl.cpp

@@ -277,7 +277,13 @@ namespace alpr
       if (!pipeline_data.disqualified)
       {
         AlprPlateResult plateResult;
-        plateResult.region = defaultRegion;
+        
+        // If there's only one pattern for a country, use it.  Otherwise use the default
+        if (country_recognizers.ocr->postProcessor.getPatterns().size() == 1)
+          plateResult.region = country_recognizers.ocr->postProcessor.getPatterns()[0];
+        else
+          plateResult.region = defaultRegion;
+        
         plateResult.regionConfidence = 0;
         plateResult.plate_index = platecount++;
 

src/openalpr/postprocess/postprocess.cpp

@@ -386,6 +386,14 @@ namespace alpr
     return true;
   }
 
+  std::vector<string> PostProcess::getPatterns() {
+    vector<string> v;
+    for(map<string,std::vector<RegexRule*> >::iterator it = rules.begin(); it != rules.end(); ++it) {
+      v.push_back(it->first);
+    }
+    
+    return v;
+  }
 
   bool letterCompare( const Letter &left, const Letter &right )
   {

src/openalpr/postprocess/postprocess.h

@@ -74,6 +74,8 @@ namespace alpr
 
       bool regionIsValid(std::string templateregion);
       
+      std::vector<std::string> getPatterns();
+      
     private:
       Config* config;