opencv 多个矢量的和

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laokugonggao 2024-11-05 16:20:53

文章标签 opencv 多个矢量的和 opencv circle point 折线 文章分类 计算机视觉人工智能

相关函数介绍

Point

该数据结构表示了由其图像坐标和指定的2D点。可定义为：
Point pt;
pt.x = 10;
pt.y = 8;
或者
Point pt = Point(10, 8);

Scalar

表示了具有4个元素的数组。次类型在OpenCV中被大量用于传递像素值。
本节中，我们将进一步用它来表示RGB颜色值（三个参数）。如果用不到第四个参数，则无需定义。
我们来看个例子，如果给出以下颜色参数表达式：
Scalar( a, b, c )
那么定义的RGB颜色值为：Red = c, Green = b and Blue= a

Rectangle

C++: void rectangle(Mat& img,Point pt1, Pointpt2, const Scalar&color, intthickness=1,intlineType=8, intshift=0)
C++: void rectangle(Mat& img,Rect rec, const Scalar&color, intthickness=1, intlineType=8,intshift=0 )
Parameters:
img – 画矩形的对象
pt1 – 矩形的一个顶点，左上角的.
pt2 – 另一个顶点，右下角的.
rec – 确定矩形的另一种方式，给左上角坐标和长宽
color – 指定矩形的颜色或亮度(灰度图像)，scalar(255,0,255)既可指定.
thickness – 矩形边框的粗细. 负值（like CV_FILLED）表示要画一个填充的矩形
lineType – 边框线型. （
8 (or 0) - 8-connected line（8邻接)连接线。
4 - 4-connected line(4邻接)连接线。
CV_AA - antialiased 线条。）
shift –坐标点的小数点位数

Line

C++: void line(Mat& img, Point pt1,Point pt2, const Scalar& color, int thickness=1, int lineType=8,int shift=0)
Parameters:
img – 图像.
pt1 – 线条起点.
pt2 – 线条终点.
color – 线条颜色.
thickness – 线条宽度.
lineType – 线型
Type of the line:
8 (or omitted) - 8-connected line.
4 - 4-connected line.
CV_AA - antialiased line.
shift – 坐标点小数点位数.

Circle

C++: void circle(Mat&img, Point center, intradius, const Scalar&color,intthickness=1, intlineType=8, intshift=0)
Parameters:
img – 要画圆的那个矩形.
center – 圆心坐标.
radius – 半径.
color – 圆边框颜色，scalar类型的
thickness – 正值表示圆边框宽度. 负值表示画一个填充圆形
lineType – 圆边框线型
shift – 圆心坐标和半径的小数点位数

Ellipse

C++: void ellipse(Mat& img, Point center,Size axes, double angle, double startAngle, double endAngle, const Scalar& color,int thickness=1, int lineType=8, int shift=0)
C++: void ellipse(Mat& img, constRotatedRect& box, const Scalar& color, int thickness=1, int lineType=8)
Parameters:
img – 椭圆所在图像.
center – 椭圆中心.
axes – 椭圆主轴一半的长度
angle – 椭圆旋转角度
startAngle – 椭圆弧起始角度
endAngle –椭圆弧终止角度
box – 指定椭圆中心和旋转角度的信息，通过 RotatedRect 或 CvBox2D. 这表示椭圆画在旋转矩形上（矩形是不可见的，只是指定了一个框而已）
color – 椭圆边框颜色.
thickness – 正值代表椭圆边框宽度，负值代表填充的椭圆
lineType – 线型
shift – 椭圆中心坐标和坐标轴的小数点位数

PolyLine

C++: void polylines(Mat& img, const Point** pts, const int* npts, int ncontours, bool isClosed, const Scalar& color, int thickness=1, int lineType=8, int shift=0 )

C++: void polylines(InputOutputArray img, InputArrayOfArrays pts, bool isClosed, const Scalar& color, int thickness=1, int lineType=8, int shift=0 )
Parameters:
img – 折线所在图像.
pts – 折线中拐点坐标指针.
npts – 折线拐点个数指针.
ncontours – 折线线段数量.
isClosed – 折线是否闭合.
color – 折线颜色.
thickness – 折线宽度.
lineType – 线型.
shift – 顶点坐标小数点位数.

PutText

C++: void putText(Mat& img, const string& text, Point org, int fontFace, double fontScale, Scalar color, int thickness=1, int lineType=8, bool bottomLeftOrigin=false )
Parameters:
img – 显示文字所在图像.
text – 待显示的文字.
org – 文字在图像中的左下角坐标.
font – 字体结构体.
fontFace – 字体类型，可选择字体：FONT_HERSHEY_SIMPLEX, FONT_HERSHEY_PLAIN, FONT_HERSHEY_DUPLEX,FONT_HERSHEY_COMPLEX, FONT_HERSHEY_TRIPLEX, FONT_HERSHEY_COMPLEX_SMALL, FONT_HERSHEY_SCRIPT_SIMPLEX, orFONT_HERSHEY_SCRIPT_COMPLEX,以上所有类型都可以配合 FONT_HERSHEY_ITALIC使用，产生斜体效果。
fontScale – 字体大小，该值和字体内置大小相乘得到字体大小
color – 文本颜色
thickness – 写字的线的粗细，类似于0.38的笔尖和0.5的笔尖
lineType – 线性.
bottomLeftOrigin – true, 图像数据原点在左下角. Otherwise, 图像数据原点在左上角.

示例代码

[cpp] view plain copy print ?

1. /**
2.  * @file Drawing_1.cpp
3.  * @brief Simple sample code
4.  */  
5.   
6. #include <opencv2/core/core.hpp>  
7. #include <opencv2/highgui/highgui.hpp>  
8.   
9. #define w 400  
10.   
11. using namespace cv;  
12.   
13. /// Function headers  
14. void MyEllipse( Mat img, double angle );  
15. void MyFilledCircle( Mat img, Point center );  
16. void MyPolygon( Mat img );  
17. void MyLine( Mat img, Point start, Point end );  
18.   
19. /**
20.  * @function main
21.  * @brief Main function
22.  */  
23. int main( void ){  
24.   
25. /// Windows names  
26. char atom_window[] = "Drawing 1: Atom";  
27. char rook_window[] = "Drawing 2: Rook";  
28.   
29. /// Create black empty images  
30.   Mat atom_image = Mat::zeros( w, w, CV_8UC3 );  
31.   Mat rook_image = Mat::zeros( w, w, CV_8UC3 );  
32.   
33. /// 1. Draw a simple atom:  
34. /// -----------------------  
35.   
36. /// 1.a. Creating ellipses  
37.   MyEllipse( atom_image, 90 );  
38.   MyEllipse( atom_image, 0 );  
39.   MyEllipse( atom_image, 45 );  
40.   MyEllipse( atom_image, -45 );  
41.   
42. /// 1.b. Creating circles  
43.   MyFilledCircle( atom_image, Point( w/2, w/2) );  
44.   
45. /// 2. Draw a rook  
46. /// ------------------  
47.   
48. /// 2.a. Create a convex polygon  
49.   MyPolygon( rook_image );  
50.   
51. /// 2.b. Creating rectangles  
52.   rectangle( rook_image,  
53.          Point( 0, 7*w/8 ),  
54.          Point( w, w),  
55.          Scalar( 0, 255, 255 ),  
56.          -1,  
57.          8 );  
58.   
59.   RotatedRect rRect = RotatedRect(Point2f(100,100), Size2f(100,50), 30);  
60.   ellipse(rook_image, rRect, Scalar(255,255,0));  
61.   
62. /// 2.c. Create a few lines  
63.   MyLine( rook_image, Point( 0, 15*w/16 ), Point( w, 15*w/16 ) );  
64.   MyLine( rook_image, Point( w/4, 7*w/8 ), Point( w/4, w ) );  
65.   MyLine( rook_image, Point( w/2, 7*w/8 ), Point( w/2, w ) );  
66.   MyLine( rook_image, Point( 3*w/4, 7*w/8 ), Point( 3*w/4, w ) );  
67.   
68. /// 3. Display your stuff!  
69.   imshow( atom_window, atom_image );  
70.   moveWindow( atom_window, 0, 200 );  
71.   imshow( rook_window, rook_image );  
72.   moveWindow( rook_window, w, 200 );  
73.   
74.   waitKey( 0 );  
75. return(0);  
76. }  
77.   
78. /// Function Declaration  
79.   
80. /**
81.  * @function MyEllipse
82.  * @brief Draw a fixed-size ellipse with different angles
83.  */  
84. void MyEllipse( Mat img, double angle )  
85. {  
86. int thickness = 2;  
87. int lineType = 8;  
88.   
89.   ellipse( img,  
90.        Point( w/2, w/2 ),  
91.        Size( w/4, w/16 ),  
92.        angle,  
93.        0,  
94.        360,  
95.        Scalar( 255, 0, 0 ),  
96.        thickness,  
97.        lineType );  
98. }  
99.   
100. /**
101.  * @function MyFilledCircle
102.  * @brief Draw a fixed-size filled circle
103.  */  
104. void MyFilledCircle( Mat img, Point center )  
105. {  
106. int thickness = -1;  
107. int lineType = 8;  
108.   
109.   circle( img,  
110.       center,  
111.       w/32,  
112.       Scalar( 0, 0, 255 ),  
113.       thickness,  
114.       lineType );  
115. }  
116.   
117. /**
118.  * @function MyPolygon
119.  * @function Draw a simple concave polygon (rook)
120.  */  
121. void MyPolygon( Mat img )  
122. {  
123. int lineType = 8;  
124.   
125. /** Create some points */  
126.   Point rook_points[1][20];  
127.   rook_points[0][0]  = Point(    w/4,   7*w/8 );  
128.   rook_points[0][1]  = Point(  3*w/4,   7*w/8 );  
129.   rook_points[0][2]  = Point(  3*w/4,  13*w/16 );  
130.   rook_points[0][3]  = Point( 11*w/16, 13*w/16 );  
131.   rook_points[0][4]  = Point( 19*w/32,  3*w/8 );  
132.   rook_points[0][5]  = Point(  3*w/4,   3*w/8 );  
133.   rook_points[0][6]  = Point(  3*w/4,     w/8 );  
134.   rook_points[0][7]  = Point( 26*w/40,    w/8 );  
135.   rook_points[0][8]  = Point( 26*w/40,    w/4 );  
136.   rook_points[0][9]  = Point( 22*w/40,    w/4 );  
137.   rook_points[0][10] = Point( 22*w/40,    w/8 );  
138.   rook_points[0][11] = Point( 18*w/40,    w/8 );  
139.   rook_points[0][12] = Point( 18*w/40,    w/4 );  
140.   rook_points[0][13] = Point( 14*w/40,    w/4 );  
141.   rook_points[0][14] = Point( 14*w/40,    w/8 );  
142.   rook_points[0][15] = Point(    w/4,     w/8 );  
143.   rook_points[0][16] = Point(    w/4,   3*w/8 );  
144.   rook_points[0][17] = Point( 13*w/32,  3*w/8 );  
145.   rook_points[0][18] = Point(  5*w/16, 13*w/16 );  
146.   rook_points[0][19] = Point(    w/4,  13*w/16 );  
147.   
148. const Point* ppt[1] = { rook_points[0] };  
149. int npt[] = { 20 };  
150.   
151.   fillPoly( img,  
152.         ppt,  
153.         npt,  
154.             1,  
155.         Scalar( 255, 255, 255 ),  
156.         lineType );  
157. }  
158.   
159. /**
160.  * @function MyLine
161.  * @brief Draw a simple line
162.  */  
163. void MyLine( Mat img, Point start, Point end )  
164. {  
165. int thickness = 2;  
166. int lineType = 8;  
167.   line( img,  
168.     start,  
169.     end,  
170.     Scalar( 0, 0, 0 ),  
171.     thickness,  
172.     lineType );  
173. }