目標

我們將學習在 OpenCV 中進行繪制操作，我們的目標包括：

• 繪制直線。使用 line() 函數。

繪制直線

Draws a line segment connecting two points.

頭文件

#include <opencv2/imgproc.hpp>

原型

C++/Java void cv::line(InputOutputArray img,Point pt1,Point pt2,const Scalar & color,int thickness = 1,int lineType = LINE_8,int shift = 0) Python: img = cv.line( img, pt1, pt2, color[, thickness[, lineType[, shift]]] )

輸入參數

img	Image.
pt1	First point of the line segment.
pt2	Second point of the line segment.
color	Line color.
thickness	Line thickness.
lineType	Type of the line. See?LineTypes.
shift	Number of fractional bits in the point coordinates.

例子

#include <opencv2/core.hpp> #include <opencv2/imgproc.hpp> #include <opencv2/highgui.hpp>#define w 400using namespace cv;void MyLine(Mat img, Point start, Point end);int main( void ){char atom_window[] = "Drawing 1: Atom";char rook_window[] = "Drawing 2: Rook";Mat rook_image = Mat::zeros( w, w, CV_8UC3 );MyLine( rook_image, Point( 0, 15*w/16 ), Point( w, 15*w/16 ) );MyLine( rook_image, Point( w/4, 7*w/8 ), Point( w/4, w ) );MyLine( rook_image, Point( w/2, 7*w/8 ), Point( w/2, w ) );MyLine( rook_image, Point( 3*w/4, 7*w/8 ), Point( 3*w/4, w ) );imshow( atom_window, atom_image );waitKey( 0 );return 0; }void MyLine( Mat img, Point start, Point end ) {int thickness = 2;int lineType = LINE_8;line( img,start,end,Scalar( 0, 0, 0 ),thickness,lineType ); }

總結

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