Merge pull request #74 from twelve17/gray_mat

Detect and use source grayscale mat if applicable.

src/openalpr/detection/detectorcpu.cpp

@@ -49,7 +49,15 @@ namespace alpr
   {
 
     Mat frame_gray;
+    if (frame.channels() > 2)
+    {
       cvtColor( frame, frame_gray, CV_BGR2GRAY );
+    }
+    else
+    {
+      frame_gray = frame;
+    }
+
 
     vector<PlateRegion> detectedRegions;
     for (int i = 0; i < regionsOfInterest.size(); i++)

src/openalpr/pipeline_data.cpp

@@ -9,7 +9,14 @@ namespace alpr
   PipelineData::PipelineData(Mat colorImage, Rect regionOfInterest, Config* config)
   {
     this->colorImg = colorImage;
+    if (colorImage.channels() > 2)
+    {
       cvtColor(this->colorImg, this->grayImg, CV_BGR2GRAY);
+    }
+    else
+    {
+      this->grayImg = colorImage;
+    }
 
     this->regionOfInterest = regionOfInterest;
     this->config = config;