diff --git a/src/openalpr/detection/detector.cpp b/src/openalpr/detection/detector.cpp
index 42a4c62..905eb09 100644
--- a/src/openalpr/detection/detector.cpp
+++ b/src/openalpr/detection/detector.cpp
@@ -29,12 +29,26 @@ namespace alpr
   {
     this->config = config;
 
+    // Load the mask specified in the config if it exists
+    if (config->detection_mask_image.length() > 0 && fileExists(config->detection_mask_image.c_str()))
+    {
+      // Load the image mask
+      if (config->debugDetector)
+        cout << "Loading detector mask: " << config->detection_mask_image << endl;
+      Mat newMask = cv::imread(config->detection_mask_image);
+
+      setMask(newMask);
+    }
   }
 
   Detector::~Detector()
   {
 
   }
+  
+  void Detector::setMask(cv::Mat mask) {
+    detector_mask.setMask(mask);
+  }
 
   bool Detector::isLoaded()
   {
diff --git a/src/openalpr/detection/detector.h b/src/openalpr/detection/detector.h
index d20bfc3..5457530 100644
--- a/src/openalpr/detection/detector.h
+++ b/src/openalpr/detection/detector.h
@@ -28,6 +28,8 @@
 #include "detector_types.h"
 #include "support/timing.h"
 #include "constants.h"
+#include "detectormask.h"
+#include "prewarp.h"
 
 namespace alpr
 {
@@ -38,16 +40,20 @@ namespace alpr
   {
 
     public:
-      Detector(Config* config);
+      Detector(Config* config, PreWarp* prewarp);
       virtual ~Detector();
 
       bool isLoaded();
       std::vector<PlateRegion> detect(cv::Mat frame);
       virtual std::vector<PlateRegion> detect(cv::Mat frame, std::vector<cv::Rect> regionsOfInterest);
 
+      //virtual std::vector<cv::Rect> find_plates(cv::Mat frame)=0;
+      
+      void setMask(cv::Mat mask);
+      
     protected:
       Config* config;
-
+      
       bool loaded;
       
       DetectorMask detector_mask;
diff --git a/src/openalpr/detection/detectorcpu.cpp b/src/openalpr/detection/detectorcpu.cpp
index 92ff337..14d25e5 100644
--- a/src/openalpr/detection/detectorcpu.cpp
+++ b/src/openalpr/detection/detectorcpu.cpp
@@ -26,11 +26,10 @@ namespace alpr
 {
 
 
-  DetectorCPU::DetectorCPU(Config* config) : Detector(config) {
-
   DetectorCPU::DetectorCPU(Config* config, PreWarp* prewarp) : Detector(config, prewarp) {
 
 
+    
     if( this->plate_cascade.load( get_detector_file() ) )
     {
       this->loaded = true;
@@ -60,18 +59,27 @@ namespace alpr
       frame.copyTo(frame_gray);
     }
 
+    // Apply the detection mask if it has been specified by the user
+    if (detector_mask.mask_loaded)
+      frame_gray = detector_mask.apply_mask(frame_gray);
 
     vector<PlateRegion> detectedRegions;   
     for (int i = 0; i < regionsOfInterest.size(); i++)
     {
+      Rect roi = regionsOfInterest[i];
+      
+      // Adjust the ROI to be inside the detection mask (if it exists)
+      if (detector_mask.mask_loaded)
+        roi = detector_mask.getRoiInsideMask(roi);
+      
       // Sanity check.  If roi width or height is less than minimum possible plate size,
       // then skip it
-      if ((regionsOfInterest[i].width < config->minPlateSizeWidthPx) || 
-          (regionsOfInterest[i].height < config->minPlateSizeHeightPx))
+      if ((roi.width < config->minPlateSizeWidthPx) || 
+          (roi.height < config->minPlateSizeHeightPx))
         continue;
       
-      Mat cropped = frame_gray(regionsOfInterest[i]);
-      vector<PlateRegion> subRegions = doCascade(cropped, regionsOfInterest[i].x, regionsOfInterest[i].y);
+      Mat cropped = frame_gray(roi);
+      vector<PlateRegion> subRegions = doCascade(cropped, roi.x, roi.y);
 
       for (int j = 0; j < subRegions.size(); j++)
         detectedRegions.push_back(subRegions[j]);
@@ -79,6 +87,7 @@ namespace alpr
     return detectedRegions;
   }
 
+  
   vector<PlateRegion> DetectorCPU::doCascade(Mat frame, int offset_x, int offset_y)
   {
 
@@ -102,7 +111,7 @@ namespace alpr
     float maxHeight = ((float) h) * (config->maxPlateHeightPercent / 100.0f) * scale_factor;
     Size minSize(config->minPlateSizeWidthPx * scale_factor, config->minPlateSizeHeightPx * scale_factor);
     Size maxSize(maxWidth, maxHeight);
-
+    
     plate_cascade.detectMultiScale( frame, plates, config->detection_iteration_increase, config->detectionStrictness,
                                       CV_HAAR_DO_CANNY_PRUNING,
                                       //0|CV_HAAR_SCALE_IMAGE,