From 03662c0589a440a2958b9c97ece7bc87831e0c91 Mon Sep 17 00:00:00 2001
From: StevenPuttemans <steven.puttemans@kuleuven.be>
Date: Thu, 4 Sep 2014 16:17:51 +0200
Subject: [PATCH] fix blobdetector

---
 modules/features2d/src/blobdetector.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/modules/features2d/src/blobdetector.cpp b/modules/features2d/src/blobdetector.cpp
index dcc8946c1d..610569dfad 100644
--- a/modules/features2d/src/blobdetector.cpp
+++ b/modules/features2d/src/blobdetector.cpp
@@ -282,6 +282,9 @@ void SimpleBlobDetector::detectImpl(const cv::Mat& image, std::vector<cv::KeyPoi
     else
         grayscaleImage = image;
 
+    if (grayscaleImage.type != CV_8UC1){
+        CV_Error(CV_StsUnsupportedFormat, "Blob detector only supports 8-bit images!");
+    }
     vector < vector<Center> > centers;
     for (double thresh = params.minThreshold; thresh < params.maxThreshold; thresh += params.thresholdStep)
     {