From d48119e7afe989ce2f3660c401ace2d410f6ba1d Mon Sep 17 00:00:00 2001
From: Matt Hill <matthill@gmail.com>
Date: Fri, 15 May 2015 05:54:17 -0400
Subject: [PATCH] Added sanity check to LBP detector

---
 src/openalpr/detection/detectorcpu.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/openalpr/detection/detectorcpu.cpp b/src/openalpr/detection/detectorcpu.cpp
index 0564f4b..5bbeb6c 100644
--- a/src/openalpr/detection/detectorcpu.cpp
+++ b/src/openalpr/detection/detectorcpu.cpp
@@ -60,9 +60,15 @@ namespace alpr
     }
 
 
-    vector<PlateRegion> detectedRegions;
+    vector<PlateRegion> detectedRegions;   
     for (int i = 0; i < regionsOfInterest.size(); i++)
     {
+      // 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))
+        continue;
+      
       Mat cropped = frame_gray(regionsOfInterest[i]);
       vector<PlateRegion> subRegions = doCascade(cropped, regionsOfInterest[i].x, regionsOfInterest[i].y);