opencv读取图像的灰度值并显示出来

#include"cv.h"
#include"highgui.h"
#include <iostream>
using namespace std;

int main(int argc, char** argv)
{
	IplImage* src = cvLoadImage( "0.bmp", 0 );　//导入图片
	int width=src->width;//图片宽度
	int height = src->height;//图片高度

	for (size_t row=0;row<height;row++)
	{
		uchar* ptr = (uchar*)src->imageData+row*src->width;//获得灰度值数据指针
		for (size_t cols=0;cols<width;cols++)
		{
			int intensity=ptr[cols];
			cout<<intensity<<"  ";
		}
	}

	return 0;  
}