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开发环境：Opencv 2.4.10+ visual studio 2013

头文件主要是

#include<opencv2\opencv.hpp>
#include<opencv2\core\core.hpp>

opencv读取图片的操作是

string file = "xxx.jpg";

src = imread(file );

imread这个函数的定义是

Mat imread( const string& filename, int flags=1 );

然后opencv 显示图片的操作则是

imshow("123", src);

imshow这个函数的定义是

void imshow(const string& winname, InputArray mat);

下面是完整代码

#include<iostream>
#include<stdio.h>
#include<string>
#include<opencv2\opencv.hpp>
#include<opencv2\core\core.hpp>

using namespace cv;
using namespace std;

int main()
{

	Mat src;
	string file = "xxx.jpg";

	src = imread(file );
	if (src.empty())
	{
		fprintf(stderr, "Can not load image %s\n", file);
		return -1;
	}
	imshow("123", src);

	waitKey(0);

	return 0;
}