opencv读取、显示、保存图像

#include <cv.h>
#include <highgui.h>
using namespace cv;
int main( int argc, char** argv )
{
if(argc != 2)
{
printf("useage: %s <imagefile>\n ", argv[0]);
return -1;
}
char* imageName = argv[1];
Mat image;
image = imread( imageName, CV_LOAD_IMAGE_COLOR);
if( !image.data )
{
printf( " No image data \n " );
return -1;
}
Mat gray_image;
cvtColor( image, gray_image, CV_BGR2GRAY );
imwrite( "../../images/Gray_Image.jpg", gray_image );

//          cvSaveImage(ImagesName, betterI);//参数是IplImage*

 namedWindow( imageName, CV_WINDOW_AUTOSIZE ); namedWindow( "Gray image", CV_WINDOW_AUTOSIZE ); imshow( imageName, image ); imshow( "Gray image", gray_image ); waitKey(0); return 0;}

说明：
cvSaveImage(ImagesName, betterI);//参数是IplImage*

两种读取图片方式都可以：
Mat imgMat = imread("20160802.jpeg");//const String* filename);

if(imgMat.empty())return -1; //是否加载成功
if(!imgMat.data)return -1;//判断是否有数据
IplImage pImg= IplImage(imgMat);
IplImage *pImg = cvLoadImage("20160802.jpeg");
IplImage *tImg =Rotate(pImg);
// IplImage* img = cvCreateImage(cvGetSize(mat),8,1);
// cvGetImage(matI,img);
cvSaveImage("rice1.png",tImg);