//--------------------------------------------
    CvPoint point;
    point.x = 40;
    point.y = 50;

//--------------------------------------------
    CvPoint2D32f pointf;
    pointf.x = 40.;
    pointf.y = 64.;

//--------------------------------------------
    CvPoint3D32f point_3d;
    point_3d.x = 23
 
.;
    point_3d.y = 34.;
    point_3d.z = -67.;

//--------------------------------------------
    CvSize size;
    size.height = 400;
    size.width = 700;

//--------------------------------------------
    CvSize2D32f sizef;
    sizef.height = 45.;
    sizef.width = 239.;

//--------------------------------------------
 

    CvRect rect;
    rect.x = 50;
    rect.y = 50;
    rect.height = 900;
    rect.width = 400;

//--------------------------------------------
    CvScalar scalar;
    scalar = cvScalar(1.3);                //只賦值第一個值，後面的預設為0
    scalar = cvScalar(1.3,1.2,1.1,1.0);
    scalar = cvScalarAll(1.0);
    scalar = cvRealScalar(1.4
 
);

//--------------------------------------------
    CvMat mat1;
    double a[9] ={
            1 , 2 , 4,
            5 , 6 , 7,
            8 , 9 , 10};
    mat1 = cvMat(3,3,CV_64FC1,a);
    cvReleaseData(&mat1);

    CvMat *mat2;
    double b[9] ={
            1 , 2 , 4,
            5 , 6 , 7,
            8 , 9 , 10};
    mat2 = cvCreateMat(3,3,CV_64FC1);
    cvInitMatHeader(mat2,3,3,CV_64FC1,b);
    cvReleaseData(&mat2);