ERROR：imshow、Mat、waitkey找不到标识符（opencv）

可以发现imshow、Mat、waitkey这三个都是opencv相关的。

在添加了相关库文件后还是有问题。

#include "stdafx.h"
#include <stdio.h>
#include <iostream>
#include "opencv2/core/core.hpp"
#include "opencv2/features2d/features2d.hpp"
#include "opencv2/highgui/highgui.hpp"
#include <opencv2/nonfree/features2d.hpp>
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/nonfree/nonfree.hpp"
#include "opencv2/legacy/legacy.hpp"
#include<math.h>
#include <string>
int _tmain(int argc, _TCHAR* argv[])
{
    uchar c[][];
    for(int i=; i<; i++)
    for(int j=; j<; j++)
        c[i][j] = (i<j)?:;
            imshow("x", Mat(, , CV_8UC1, (void *)c));
            waitKey();
    return ;
}

是缺少了

using namespace cv;
using namespace std;