(1)间接访问(调用函数访问)效率不高
IplImage*src=cvLoadImage(filename,0); CvScalar s=cvGet2D(src,i,j); printf("%f",s.val[0]); cvSet2D(src,i,j,s);
(2)直接访问(单通道单字节)
IplImage* src=cvLoadImage(filename,0); (uchar*)(src->imagedata+h*src->widthstep)[w]=111;
(3)指针访问(单通道)
uchar* data=(uchar*)src->imagedata; int step=src->widthstep/sizeof(uchar); data[h*step+w]=111;
指针访问(多通道)
float*data=(float*)src->imagedata; int step=src->widthstep/sizeof(float); data[h*step+w*channels+k]=111;
(4)利用C++模板
template<class T> class Image { public: IplImage* pimg; Image(IplImage* img=0){pimg = img;} ~Image(){pimg=0;} void operater=(pimg=img;) inline T* operater[](const int row) {return ((T*)(pimg->imagedata+row*pimg->widthstep));} } struct RgbPixel { unsigned char r,g,b; }; struct RgbPixelFloat { float r,g,b; } Image<unsigned char> imageA(src); imageA[i][j]=111;