mitkConvertGrayscaleOpenCVImageFilterTest.cpp

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/*============================================================================
 
The Medical Imaging Interaction Toolkit (MITK)
 
Copyright (c) German Cancer Research Center (DKFZ)
All rights reserved.
 
Use of this source code is governed by a 3-clause BSD license that can be
found in the LICENSE file.
 
============================================================================*/
 
#include "mitkConvertGrayscaleOpenCVImageFilter.h"
#include <mitkTestingMacros.h>
 
#include <opencv2/imgproc.hpp>
#include <opencv2/imgproc/imgproc_c.h>
#include <opencv2/imgcodecs.hpp>
 
static void ConvertTestLoadedImage(std::string mitkImagePath, std::string mitkGrayscaleImagePath)
{
  cv::Mat image = cv::imread(mitkImagePath.c_str());
  cv::Mat compareImg = cv::imread(mitkGrayscaleImagePath.c_str());
 
  // directly convert the image for comparison
  cv::Mat comparisonImg;
  cv::cvtColor(compareImg, comparisonImg, CV_RGB2GRAY, 1);
 
  mitk::ConvertGrayscaleOpenCVImageFilter::Pointer grayscaleFilter
      = mitk::ConvertGrayscaleOpenCVImageFilter::New();
 
  MITK_TEST_CONDITION(grayscaleFilter->FilterImage(image), "Filtering should return true for success.");
 
  MITK_TEST_CONDITION(image.channels() == 1, "Image must not have more than one channel after grayscale conversion.");
 
  MITK_TEST_CONDITION(cv::countNonZero(image != comparisonImg) == 0, "All pixel values must be the same between the two converted images.");
 
  MITK_TEST_CONDITION_REQUIRED(grayscaleFilter->FilterImage(image), "Image conversion should be no problem if image is a grayscale image already.")
}
 
int mitkConvertGrayscaleOpenCVImageFilterTest(int argc, char* argv[])
{
  MITK_TEST_BEGIN("ConvertGrayscaleOpenCVImageFilter")
 
  MITK_TEST_CONDITION_REQUIRED(argc > 2, "At least three parameters needed for this test.")
 
  ConvertTestLoadedImage(argv[1], argv[2]);
 
  MITK_TEST_END(); // always end with this!
 
}