这边要介绍的,是所有跟点(Point)相关的数据结构,也可以把它当做是坐标的表达方式,被包在"cxtype.h"里,最常用的点数据结构为CvPoint及CvPoint2D32f,可以在许多算法应用上看的到.

CvPoint相关数据结构
#include <cv.h>
#include <stdio.h>
#include <stdlib.h>

int main()
{
    CvPoint Point1=cvPoint(300,200);

    CvPoint2D32f Point2 = cvPoint2D32f(200.0,240.0);
    CvPoint2D64f Point3 = cvPoint2D64f(100.0,300.0);

    CvPoint3D32f Point4 = cvPoint3D32f(100.0,200.0,300.0);
    CvPoint3D64f Point5 = cvPoint3D64f(100.0,100.0,100.0);

    CvPoint2D32f Point6 = cvPointTo32f(Point1);
    CvPoint Point7 = cvPointFrom32f(Point6);

    printf("2 Dimension\n");
    printf("Point1 : (%d ,%d)\n",Point1.x,Point1.y);
    printf("Point2 : (%.1f,%.1f)\n",Point2.x,Point2.y);
    printf("Point3 : (%.1f,%.1f)\n",Point3.x,Point3.y);

    printf("\n3 Dimension\n");
    printf("Point4 : (%.1f,%.1f,%.1f)\n",Point4.x,Point4.y,Point4.z);
    printf("Point5 : (%.1f,%.1f,%.1f)\n",Point5.x,Point5.y,Point5.z);

    printf("\nConvert\n");
    printf("Point6 : (%.1f,%.1f)\n",Point6.x,Point6.y);
    printf("Point7 : (%d,%d)\n\n",Point7.x,Point7.y);

    system("pause");
}

执行结果:


上面的只是简单的初始化,并且打印出来,Point6及Point7则是做简单的转换.

再来是CvPoint相关数据结构变量类型介绍
(1)常用的CvPoint数据结构
        

(2)OpenCV少用的CvPoint结构
    


cvPoint()
初始化CvPoint数据结构,为OpenCV常用数据结构
cvPoint(int类型row,int类型colunm)

cvPoint2D32f()
初始化CvPoint数据结构,为OpenCV常用数据结构
cvPoint2D32f(float类型row,float类型colunm)

cvPoint2D64f()
初始化cvPoint2D64f数据结构
cvPoint2D64f(double类型row,double类型colunm)

cvPoint3D32f()
初始化cvPoint3D32f数据结构
cvPoint3D32f(float类型x坐标,float类型y坐标,float类型z坐标)

cvPoint3D64f()
初始化cvPoint3D64f数据结构
cvPoint3D64f(double类型x坐标,double类型y坐标,double类型z坐标)

cvPointTo32f()
将CvPoint数据结构转换成CvPoint2D32f数据结构
cvPointTo32f(CvPoint数据结构)

cvPointFrom32f()
将CvPoint2D32f数据结构转换成CvPoint数据结构
cvPointFrom32f(CvPoint2D32f数据结构)