opencv2.4.4

今天用cvFilllPoly()進行影象的繪製，其中遇到一些引數的問題，個人理解如下：

CVAPI(void)  cvFillPoly( CvArr* img, CvPoint** pts, const int* npts,
                         int contours, CvScalar color,
                         int line_type CV_DEFAULT(8), int shift CV_DEFAULT(0) );

img：影象

pst：折線的頂點指標陣列，即：每個影象陣列首個座標的地址

npts：多邊形頂點個數陣列，2-2個影象，4-第一個影象有4個頂點，3-第二個影象有3個頂點

contours：折線的線段數量，如第三個引數說明所示，我想畫兩個多邊形，那這個引數就是2，如果想畫4個多邊形，這個引數就是4

color：多邊形中的填充色

line_type ：組成多邊形線段型別

shift：頂點座標的小數點位數

個人覺得cvFillPoly的難點主要在於雙指標和陣列處，寫了一個程式

方法三：

//畫多邊形
#include "cv.h"
#include "highgui.h"
#include "cxcore.h"
#include "stdio.h"


int main(void)
{
IplImage* image;
CvSize imagesize = cvSize(640,640);
CvPoint spoint1[3] = {{100,150},{430,240},{352,466}};
CvPoint spoint2[4] = {{440,300},{560,450},{318,600},{100,419}};
CvPoint* pts1[1] = {&spoint1[0]};
CvPoint* pts2[1] = {&spoint2[0]};
int npts1[1] = {3};
int npts2[1] = {4};


image = cvCreateImage(imagesize, IPL_DEPTH_8U, 3);
cvFillPoly(image, pts1, npts1, 1, CV_RGB(255,0,0),8,0);
cvFillPoly(image, pts2, npts2, 1, CV_RGB(0,0,255),8,0);


cvShowImage("image", image);
cvWaitKey(0);
}

方法二：

//畫多邊形
#include "cv.h"
#include "highgui.h"
#include "cxcore.h"
#include "stdio.h"


int main(void)
{
IplImage* image;
CvSize imagesize = cvSize(640,640);
CvPoint spoint1[3] = {{100,150},{430,240},{352,466}};
CvPoint spoint2[4] = {{440,300},{560,450},{318,600},{100,419}};
CvPoint* pts1[2] = {&spoint1[0],&spoint2[0]};
int npts1[2] = {3,4};


image = cvCreateImage(imagesize, IPL_DEPTH_8U, 3);
cvFillPoly(image, pts1, npts1, 2, CV_RGB(255,0,0),8,0);


cvShowImage("image", image);
cvWaitKey(0);
}

方法三：

//畫多邊形
/*#include "cv.h"
#include "highgui.h"
#include "cxcore.h"
#include "stdio.h"


int main(void)
{
IplImage* image;
CvSize imagesize = cvSize(640,640);
CvPoint spoint1[3] = {{100,150},{430,240},{352,466}};
CvPoint spoint2[4] = {{440,300},{560,450},{318,600},{100,419}};
CvPoint* pts1[1] = {&spoint1[0]};
CvPoint* pts2[1] = {&spoint2[0]};
int npts1[1] = {3};
int npts2[1] = {4};


image = cvCreateImage(imagesize, IPL_DEPTH_8U, 3);
cvFillPoly(image, pts1, npts1, 1, CV_RGB(255,0,0),8,0);
cvFillPoly(image, pts2, npts2, 1, CV_RGB(0,0,255),8,0);


cvShowImage("image", image);
cvWaitKey(0);
}*/


//畫多邊形
#include "cv.h"
#include "highgui.h"
#include "cxcore.h"
#include "stdio.h"


int main(void)
{
IplImage* image;
CvSize imagesize = cvSize(640,640);
CvPoint spoint1[7];
CvPoint* pts1[2] = {&spoint1[0],&spoint1[3]};
int npts1[2] = {3,4};


spoint1[0] = cvPoint(100,150);
spoint1[1] = cvPoint(430,240);
spoint1[2] = cvPoint(352,466);
spoint1[3] = cvPoint(440,300);
spoint1[4] = cvPoint(560,450);
spoint1[5] = cvPoint(318,600);
spoint1[6] = cvPoint(100,419);


image = cvCreateImage(imagesize, IPL_DEPTH_8U, 3);
cvFillPoly(image, pts1, npts1, 2, CV_RGB(255,0,0),8,0);


cvShowImage("image", image);
cvWaitKey(0);
}