diff --git a/Modules/OpenCVVideoSupport/Testing/mitkConvertGrayscaleOpenCVImageFilterTest.cpp b/Modules/OpenCVVideoSupport/Testing/mitkConvertGrayscaleOpenCVImageFilterTest.cpp
index 6c013faf8f..42c5afb03c 100644
--- a/Modules/OpenCVVideoSupport/Testing/mitkConvertGrayscaleOpenCVImageFilterTest.cpp
+++ b/Modules/OpenCVVideoSupport/Testing/mitkConvertGrayscaleOpenCVImageFilterTest.cpp
@@ -1,52 +1,52 @@
 /*===================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center,
 Division of Medical and Biological Informatics.
 All rights reserved.
 
 This software is distributed WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR
 A PARTICULAR PURPOSE.
 
 See LICENSE.txt or http://www.mitk.org for details.
 
 ===================================================================*/
 
 #include "mitkConvertGrayscaleOpenCVImageFilter.h"
 #include <mitkTestingMacros.h>
 
 #include <highgui.h>
 #include <cv.h>
 
 static void ConvertTestLoadedImage(std::string mitkImagePath)
 {
   cv::Mat image = cvLoadImage(mitkImagePath.c_str());
 
   // directly convert the image for comparison
   cv::Mat comparisonImg;
   cv::cvtColor(image, comparisonImg, CV_RGB2GRAY, 1);
 
   mitk::ConvertGrayscaleOpenCVImageFilter::Pointer grayscaleFilter
       = mitk::ConvertGrayscaleOpenCVImageFilter::New();
 
   MITK_TEST_CONDITION_REQUIRED(grayscaleFilter->FilterImage(image), "Filtering should return true for success.");
 
   MITK_TEST_CONDITION_REQUIRED(image.channels() == 1, "Image must not have more than one channel after grayscale conversion.");
 
-  MITK_TEST_CONDITION_REQUIRED(cv::countNonZero(image != comparisonImg), "All pixel values must be the same between the two converted images.");
+  MITK_TEST_CONDITION_REQUIRED(cv::countNonZero(image != comparisonImg) == 0, "All pixel values must be the same between the two converted images.");
 }
 
 /**Documentation
  *  test for the class "ConvertGrayscaleOpenCVImageFilter".
  */
 int mitkConvertGrayscaleOpenCVImageFilterTest(int argc, char* argv[])
 {
   MITK_TEST_BEGIN("ConvertGrayscaleOpenCVImageFilter")
 
   ConvertTestLoadedImage(argv[1]);
   // always end with this!
   MITK_TEST_END();
 
 }
diff --git a/Modules/OpenCVVideoSupport/Testing/mitkCropOpenCVImageFilterTest.cpp b/Modules/OpenCVVideoSupport/Testing/mitkCropOpenCVImageFilterTest.cpp
index 16d3d686d4..197c49c320 100644
--- a/Modules/OpenCVVideoSupport/Testing/mitkCropOpenCVImageFilterTest.cpp
+++ b/Modules/OpenCVVideoSupport/Testing/mitkCropOpenCVImageFilterTest.cpp
@@ -1,69 +1,80 @@
 /*===================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center,
 Division of Medical and Biological Informatics.
 All rights reserved.
 
 This software is distributed WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR
 A PARTICULAR PURPOSE.
 
 See LICENSE.txt or http://www.mitk.org for details.
 
 ===================================================================*/
 
 #include "mitkCropOpenCVImageFilter.h"
 #include <mitkTestingMacros.h>
 
 #include <highgui.h>
 #include <cv.h>
 
+static bool ImagesAreEqualInGray(const cv::Mat& img1, const cv::Mat& img2)
+{
+  cv::Mat grayImg1;
+  cv::Mat grayImg2;
+
+  cv::cvtColor(img1, grayImg1, CV_RGB2GRAY, 1);
+  cv::cvtColor(img2, grayImg2, CV_RGB2GRAY, 1);
+
+  return cv::countNonZero(grayImg1 != grayImg2) == 0;
+}
+
 static void CropTestLoadedImage(std::string mitkImagePath)
 {
   cv::Mat image = cvLoadImage(mitkImagePath.c_str());
   cv::Mat compareImg = image.clone();
 
   mitk::CropOpenCVImageFilter::Pointer cropFilter = mitk::CropOpenCVImageFilter::New();
 
   // try to crop without setting a region of interest
   MITK_TEST_CONDITION_REQUIRED( ! cropFilter->FilterImage(image), "Filter function must return false if no region of interest is set.");
-  MITK_TEST_CONDITION_REQUIRED(cv::countNonZero(image != compareImg), "Image should not be changed yet.");
+  MITK_TEST_CONDITION_REQUIRED(ImagesAreEqualInGray(image, compareImg), "Image should not be changed yet.");
 
   // set region of interst now and then try to crop again
   cv::Rect roi = cv::Rect(0,0, image.cols, image.rows);
   cropFilter->SetCropRegion(roi);
   MITK_TEST_CONDITION_REQUIRED(cropFilter->FilterImage(image), "Filter function should return successfully.");
-  MITK_TEST_CONDITION_REQUIRED(cv::countNonZero(image != compareImg), "Image should not be changed if cropping with a roi of the whole image.");
+  MITK_TEST_CONDITION_REQUIRED(ImagesAreEqualInGray(image, compareImg), "Image should not be changed if cropping with a roi of the whole image.");
 
   // test if filter corrects negative roi position
   cv::Rect roiWrong = cv::Rect(-1,-1, 2, 2);
   roi = cv::Rect(0,0,2,2);
   cropFilter->SetCropRegion(roiWrong);
   MITK_TEST_CONDITION_REQUIRED(cropFilter->FilterImage(image), "Filter function should return successfully.");
-  MITK_TEST_CONDITION_REQUIRED(cv::countNonZero(image != compareImg(roi)), "Image should be equal to directly cropped image whith correct roi.");
+  MITK_TEST_CONDITION_REQUIRED(ImagesAreEqualInGray(image, compareImg(roi)), "Image should be equal to directly cropped image whith correct roi.");
 
   // test whith "normal" roi
-  roi = cv::Rect( 5,5,10,10 );
+  //roi = cv::Rect( 5,5,10,10 );
   cropFilter->SetCropRegion(roi);
   MITK_TEST_CONDITION_REQUIRED(cropFilter->FilterImage(image), "Filter function should return successfully.");
-  MITK_TEST_CONDITION_REQUIRED(cv::countNonZero(image != compareImg(roi)), "Image should be equal to directly cropped image.");
+  MITK_TEST_CONDITION_REQUIRED(ImagesAreEqualInGray(image, compareImg(roi)), "Image should be equal to directly cropped image.");
 
   // test with not correctable roi
   roiWrong = cv::Rect( 5,5,-1,-1 );
   MITK_TEST_FOR_EXCEPTION(mitk::Exception, cropFilter->SetCropRegion(roiWrong));
 }
 
 /**Documentation
  *  test for the class "CropOpenCVImageFilter".
  */
 int mitkCropOpenCVImageFilterTest(int argc, char* argv[])
 {
   MITK_TEST_BEGIN("CropOpenCVImageFilter")
 
   CropTestLoadedImage(argv[1]);
   // always end with this!
   MITK_TEST_END();
 
 }