example_02-05.cpp

// Example 2-5. Loading and then smoothing an image before it is displayed on the screen

#include <opencv2/opencv.hpp>



void help(char** argv ) {
	std::cout << "\n"
	<< "2-05: load and smooth an image before displaying \n"
	<< argv[0] <<" <path/video>\n"
	<< "For example:\n"
	<< argv[0] << " ../tree.avi\n"
	<< std::endl;
}
	

int main( int argc, char** argv ) {
	
	if (argc != 2) {
		help(argv);
		return 0;
	}

  // Load an image specified on the command line.
  //
  cv::Mat image = cv::imread(argv[1],-1);

  // Create some windows to show the input
  // and output images in.
  //
  cv::namedWindow( "Example 2-5-in", cv::WINDOW_AUTOSIZE );
  cv::namedWindow( "Example 2-5-out", cv::WINDOW_AUTOSIZE );

  // Create a window to show our input image
  //
  cv::imshow( "Example 2-5-in", image );

  // Create an image to hold the smoothed output
  //
  cv::Mat out;

  // Do the smoothing
  // ( Note: Could use GaussianBlur(), blur(), medianBlur() or
  // bilateralFilter(). )
  //
  cv::GaussianBlur( image, out, cv::Size(5,5), 3, 3);
  cv::GaussianBlur( out, out, cv::Size(5,5), 3, 3);

  // Show the smoothed image in the output window
  //
  cv::imshow( "Example 2-5-out", out );

  // Wait for the user to hit a key, windows will self destruct
  //
  cv::waitKey( 0 );

}