《学习opencv》笔记——关于一些绘图的函数

绘图函数

(1)直线cvLine函数

其结构

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1. void cvLine(//画直线 
2.     CvArr* array,//画布图像 
3.     CvPoint pt1,//起始点 
4.     CvPoint pt2,//终点 
5.     CvScalar color,//颜色 
6.     int thickness = 1,//宽度 
7.     int connectivity = 8//反走样 
8. ); 

void cvLine(//画直线CvArr* array,//画布图像CvPoint pt1,//起始点CvPoint pt2,//终点CvScalar color,//颜色int thickness = 1,//宽度int connectivity = 8//反走样);

实例代码

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1. #include <cv.h> 
2. #include <highgui.h> 
3. #include <stdio.h> 
4.  
5. int main(int argc,char** argv) 
6. { 
7.     IplImage *src1; 
8.     src1 = cvLoadImage("10.jpg"); 
9.      
10.     cvLine(src1,cvPoint(20,20),cvPoint(250,250),CV_RGB(255,0,0),8); 
11.  
12.     cvShowImage( "原图", src1); 
13.     cvWaitKey(); 
14.     return 0; 
15. } 

#include <cv.h>#include <highgui.h>#include <stdio.h>int main(int argc, char** argv){IplImage *src1;src1 = cvLoadImage("10.jpg");cvLine(src1,cvPoint(20,20),cvPoint(250,250),CV_RGB(255,0,0),8);cvShowImage( "原图", src1);cvWaitKey();return 0;}

输出结果

(2)矩形cvRectangle函数

其结构

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1. void cvRectangle(//画矩形 
2.     CvArr* array,//画布图形 
3.     CvPoint pt1,//起始点 
4.     CvPoint pt2,//终点 
5.     CvScalar color,//颜色 
6.     int thickness = 1,//宽度 
7. ); 

void cvRectangle(//画矩形CvArr* array,//画布图形CvPoint pt1,//起始点CvPoint pt2,//终点CvScalar color,//颜色int thickness = 1,//宽度);

实例代码

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1. #include <cv.h> 
2. #include <highgui.h> 
3. #include <stdio.h> 
4.  
5. int main(int argc,char** argv) 
6. { 
7.     IplImage *src1; 
8.     src1 = cvLoadImage("10.jpg"); 
9.      
10.     cvRectangle(src1,cvPoint(20,20),cvPoint(200,200),CV_RGB(0,255,0),8); 
11.  
12.     cvShowImage( "原图", src1); 
13.     cvWaitKey(); 
14.     return 0; 
15. } 

#include <cv.h>#include <highgui.h>#include <stdio.h>int main(int argc, char** argv){IplImage *src1;src1 = cvLoadImage("10.jpg");cvRectangle(src1,cvPoint(20,20),cvPoint(200,200),CV_RGB(0,255,0),8);cvShowImage( "原图", src1);cvWaitKey();return 0;}

输出结果

(3)圆形cvCircle函数

其结构

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1. void cvCircle(//画圆 
2.     CvArr* array,//画布图像 
3.     CvPoint cevter,//圆心 
4.     int radius,//半径 
5.     CvScalar color,//颜色 
6.     int thickness = 1,//宽度 
7.     int connectivity = 8//反走样 
8. ); 

void cvCircle(//画圆CvArr* array,//画布图像CvPoint cevter,//圆心int radius,//半径CvScalar color,//颜色int thickness = 1,//宽度int connectivity = 8//反走样);

实例代码

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1. #include <cv.h> 
2. #include <highgui.h> 
3. #include <stdio.h> 
4.  
5. int main(int argc,char** argv) 
6. { 
7.     IplImage *src1; 
8.     src1 = cvLoadImage("10.jpg"); 
9.      
10.     cvCircle(src1,cvPoint(150,150),100,CV_RGB(0,0,255),5); 
11.  
12.     cvShowImage( "原图", src1); 
13.     cvWaitKey(); 
14.     return 0; 
15. } 

#include <cv.h>#include <highgui.h>#include <stdio.h>int main(int argc, char** argv){IplImage *src1;src1 = cvLoadImage("10.jpg");cvCircle(src1,cvPoint(150,150),100,CV_RGB(0,0,255),5);cvShowImage( "原图", src1);cvWaitKey();return 0;}

输出结果

(4)椭圆cvEllipse函数

其结构

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1. void cvEllipse(//画椭圆 
2.     CvArr* img,//画布图像 
3.     CvPoint center,//中心点 
4.     CvSize axes,//长短轴 
5.     double angle,//偏离主轴角度 
6.     double start_angle,//弧线开始位置 
7.     double end_angle,//弧线结束位置 
8.     CvScalar color,//颜色 
9.     int thickness = 1,//宽度 
10.     int line_type = 8// 
11. ); 

void cvEllipse(//画椭圆CvArr* img,//画布图像CvPoint center,//中心点CvSize axes,//长短轴double angle,//偏离主轴角度double start_angle,//弧线开始位置double end_angle,//弧线结束位置CvScalar color,//颜色int thickness = 1,//宽度int line_type = 8//);

实例代码

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1. #include <cv.h> 
2. #include <highgui.h> 
3. #include <stdio.h> 
4.  
5. int main(int argc,char** argv) 
6. { 
7.     IplImage *src1; 
8.     src1 = cvLoadImage("10.jpg"); 
9.      
10.     cvEllipse(src1,cvPoint(150,150),cvSize(150,50),45,0,360,CV_RGB(255,0,0),3); 
11.  
12.     cvShowImage( "原图", src1); 
13.     cvWaitKey(); 
14.     return 0; 
15. } 

#include <cv.h>#include <highgui.h>#include <stdio.h>int main(int argc, char** argv){IplImage *src1;src1 = cvLoadImage("10.jpg");cvEllipse(src1,cvPoint(150,150),cvSize(150,50),45,0,360,CV_RGB(255,0,0),3);cvShowImage( "原图", src1);cvWaitKey();return 0;}

输出结果

(5)多边形函数

1.cvFillPoly函数

其结构

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1. void cvFillPoly(//画多个实心多边形 
2.     CvArr* img,//画布图像 
3.     CvPoint** pts,//点序列 
4.     int* npt,//计数点数组 
5.     int contours,//显示几个多边形 
6.     CvScalar color,//颜色 
7.     int line_type = 8 
8. ); 

void cvFillPoly(//画多个实心多边形CvArr* img,//画布图像CvPoint** pts,//点序列int* npt,//计数点数组int contours,//显示几个多边形CvScalar color,//颜色int line_type = 8);

2.cvFillConvexPoly函数

其结构

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1. void cvFillConvexPoly(//画一个实心多边形 
2.     CvArr* img,//画布图像 
3.     CvPoint* pts,//点序列 
4.     int npt,//计数点数组 
5.     CvScalar color,//颜色 
6.     int line_type = 8 
7. ); 

void cvFillConvexPoly(//画一个实心多边形CvArr* img,//画布图像CvPoint* pts,//点序列int npt,//计数点数组CvScalar color,//颜色int line_type = 8);

3.cvPolyLine函数

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1. void cvFillPoly(//画多个空心多边形 
2.     CvArr* img,//画布图像 
3.     CvPoint** pts,//点序列 
4.     int* npt,//计数点数组 
5.     int contours,//显示几个多边形 
6.     int is_closed,//是否从上个多边形尾点开始 
7.     CvScalar color,//颜色 
8.     int thickness = 1,//宽度 
9.     int line_type = 8 
10. ); 

void cvFillPoly(//画多个空心多边形CvArr* img,//画布图像CvPoint** pts,//点序列int* npt,//计数点数组int contours,//显示几个多边形int is_closed,//是否从上个多边形尾点开始CvScalar color,//颜色int thickness = 1,//宽度int line_type = 8);

实例代码

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1. #include <cv.h> 
2. #include <highgui.h> 
3. #include <stdio.h> 
4.  
5. int main(int argc,char** argv) 
6. { 
7.     IplImage *src1,*src2,*src3; 
8.     src1 = cvLoadImage("7.jpg"); 
9.     src2 = cvLoadImage("8.jpg"); 
10.     src3 = cvLoadImage("9.jpg"); 
11.  
12.     int arr[3]= {4,4,4};    
13.  
14.     CvPoint ** pt =new CvPoint*[3]; 
15.  
16.     pt[0] = new CvPoint[4];   
17.     pt[0][0] = cvPoint(10,10);   
18.     pt[0][1] = cvPoint(210,10);   
19.     pt[0][2] = cvPoint(210,210);   
20.     pt[0][3] = cvPoint(10,210);   
21.     pt[1] = new CvPoint[4];  
22.     pt[1][0] = cvPoint(10,310);   
23.     pt[1][1] = cvPoint(210,310);   
24.     pt[1][2] = cvPoint(210,510);   
25.     pt[1][3] = cvPoint(10,510);   
26.     pt[2] = new CvPoint[4];  
27.     pt[2][0] = cvPoint(310,10);   
28.     pt[2][1] = cvPoint(410,10);   
29.     pt[2][2] = cvPoint(410,210);   
30.     pt[2][3] = cvPoint(310,210);   
31.  
32.     cvPolyLine(src1, pt, arr, 3, 1, CV_RGB(0,255,0),5);   
33.  
34.     cvFillPoly(src2, pt,arr,3,CV_RGB(250,0,0));   
35.  
36.     cvFillConvexPoly(src3,pt[0],4,CV_RGB(0,0,255)); 
37.  
38.     cvShowImage( "原图1", src1); 
39.     cvShowImage( "原图2", src2); 
40.     cvShowImage( "原图3", src3); 
41.     cvWaitKey(); 
42.     return 0; 
43. } 

#include <cv.h>#include <highgui.h>#include <stdio.h>int main(int argc, char** argv){IplImage *src1,*src2,*src3;src1 = cvLoadImage("7.jpg");src2 = cvLoadImage("8.jpg");src3 = cvLoadImage("9.jpg");int arr[3]= {4,4,4};   CvPoint ** pt =new CvPoint*[3];pt[0] = new CvPoint[4];  pt[0][0] = cvPoint(10,10);  pt[0][1] = cvPoint(210,10);  pt[0][2] = cvPoint(210,210);  pt[0][3] = cvPoint(10,210);  pt[1] = new CvPoint[4]; pt[1][0] = cvPoint(10,310);  pt[1][1] = cvPoint(210,310);  pt[1][2] = cvPoint(210,510);  pt[1][3] = cvPoint(10,510);  pt[2] = new CvPoint[4]; pt[2][0] = cvPoint(310,10);  pt[2][1] = cvPoint(410,10);  pt[2][2] = cvPoint(410,210);  pt[2][3] = cvPoint(310,210);  cvPolyLine(src1, pt, arr, 3, 1, CV_RGB(0,255,0),5);  cvFillPoly(src2, pt,arr,3,CV_RGB(250,0,0));  cvFillConvexPoly(src3,pt[0],4,CV_RGB(0,0,255));cvShowImage( "原图1", src1);cvShowImage( "原图2", src2);cvShowImage( "原图3", src3);cvWaitKey();return 0;}

输出结果

(6)绘制文字cvPutText函数

其结构

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1. void cvPutText(//绘制文字 
2.     CvArr* img,//绘图图像 
3.     const char* text,//文字内容 
4.     CvPoint origin,//文字起始位置 
5.     const CvFont* font,//文字字体设置 
6.     CvScalar color//颜色 
7. ); 

void cvPutText(//绘制文字CvArr* img,//绘图图像const char* text,//文字内容CvPoint origin,//文字起始位置const CvFont* font,//文字字体设置CvScalar color//颜色);

实例代码

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1. #include <cv.h> 
2. #include <highgui.h> 
3. #include <stdio.h> 
4.  
5. int main(int argc,char** argv) 
6. { 
7.     IplImage *src1,*src2,*src3; 
8.     src1 = cvLoadImage("10.jpg"); 
9.  
10.     char* str = "I am a student!"; 
11.  
12.     CvFont* cf = new CvFont(); 
13.  
14.     cvInitFont(cf,CV_FONT_HERSHEY_SIMPLEX,1.0,0.5); 
15.  
16.     cvPutText(src1,str,cvPoint(50,100),cf,CV_RGB(255,0,0)); 
17.  
18.     cvShowImage( "原图1", src1); 
19.     cvWaitKey(); 
20.     return 0; 
21. } 

#include <cv.h>#include <highgui.h>#include <stdio.h>int main(int argc, char** argv){IplImage *src1,*src2,*src3;src1 = cvLoadImage("10.jpg");char* str = "I am a student!";CvFont* cf = new CvFont();cvInitFont(cf,CV_FONT_HERSHEY_SIMPLEX,1.0,0.5);cvPutText(src1,str,cvPoint(50,100),cf,CV_RGB(255,0,0));cvShowImage( "原图1", src1);cvWaitKey();return 0;}

输出结果