template<class T> class Image

 {

     private:

         IlpImage *imgp;

     public:

         Image(IplImage* img = 0)

         {

             imgp = img;

         }

         inline T* operator[](const int rowIndx)

         {

             return( (T*)(imgp ->imageData + rowIndx * imgp ->widthStep));

         }

 };

 

 typedef struct {

     unsigned char b, g, r;

 }RgbPixel;

 

 typedef struct {

     float b, g, r;

 }RgbPixelFloat;

 

 typedef Image<RgbPixel>      RgbImage;

 typedef Imgae<RgbPixelFloat> RgbImageFloat;

 typedef Image<unsigned char> BwImage;

 typedef Image<float>         BwImageFloat;

例：对3通道的字节型图像访问如下：

 IplImage* img = cvCreateImage(cvSize(640, 480), IPL_DEPTH_8U, 3);

 RgbImage imgA(img);

 //假设访问第K通道、第i行、第j列的像素

 imgA[i][j].b = 111;

 imgA[i][j].g = 111;

 imgA[i][j].r = 111;