linux环境中如何运行第一个opencv程序，我环境配置好了，就是运行的时候提示有错。如能解决，另外加分

Question

#include "cv.h"
#include "highgui.h"
using namespace cv; //下面的所有cv相关类型不用加上前缀了
int main(int argc, char* argv[])
{
Mat img = imread("lena.jpg"); //声明Mat变量并调入lena小妞（老妞了现在？）的照片
if(!img.data) //判断图片调入是否成功
return -1; //调入图片失败则退出

namedWindow("loveLena", CV_WINDOW_AUTOSIZE); //创建窗口,并确定其为大小不可变类型窗口
imshow("loveLena", img); //显示图片。如果你不介意窗口大小可变，可以直接注释掉上一句。因为imshow可以直接创建窗口
waitKey(); //等待按键
return 0;
}
运行后提示的错误如下：（简单的说就是using namespace cv;这里好像有错）

Description Resource Path Location Type
‘cv’ is not a namespace-name sd.cpp /opencv1 line 4 C/C++ Problem
‘img’ was not declared in this scope sd.cpp /opencv1 line 10 C/C++ Problem
‘img’ was not declared in this scope sd.cpp /opencv1 line 15 C/C++ Problem
‘imshow’ was not declared in this scope sd.cpp /opencv1 line 15 C/C++ Problem
‘Mat’ was not declared in this scope sd.cpp /opencv1 line 8 C/C++ Problem
‘namedWindow’ was not declared in this scope sd.cpp /opencv1 line 13 C/C++ Problem
‘waitKey’ was not declared in this scope sd.cpp /opencv1 line 17 C/C++ Problem
expected ‘;’ before ‘img’ sd.cpp /opencv1 line 8 C/C++ Problem
expected namespace-name before ‘;’ token sd.cpp /opencv1 line 4 C/C++ Problem
make: *** [sd.o] 错误 1 opencv1 C/C++ Problem

Answer 1

”……“ was not declared in this scope。。。当出现这种问题的时候，一般是头文件不对，查一下你库存放的位置，版本不同 #include 后面写的都不同的

Answer 2

#include<opencv2/opencv.hpp> 试试？

Answer 3

应该是配置问题。重点去看源代码中cv是在哪边定义。我这边试了下可以。