OpenCV自帶例子（一）Load and Display an Image

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <iostream>
using namespace cv;
using namespace std;
int main( int argc, char** argv )
{
	if( argc != 2)
	{
		cout <<" Usage: display_image ImageToLoadAndDisplay" << endl;
		return -1;
	}
	Mat image;
	image = imread(argv[1], CV_LOAD_IMAGE_COLOR); // Read the file
	if(! image.data ) // Check for invalid input
	{
		cout << "Could not open or find the image" << std::endl ;
		return -1;
	}
	namedWindow( "Display window", CV_WINDOW_AUTOSIZE );// Create a window for display.
	imshow( "Display window", image ); // Show our image inside it.
	waitKey(0); // Wait for a keystroke in the window
	return 0;
}

In this tutorial you will learn how to:
• Load an image (using imread)
• Create a named OpenCV window (using namedWindow)

• Display an image in an OpenCV window (using imshow)