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OpenCV绘图函数（5）绘制标记函数drawMarker()的使用

news 来源：原创 2024/9/20 9:40:47

操作系统：ubuntu22.04
OpenCV版本：OpenCV4.9
IDE:Visual Studio Code
编程语言：C++11

算法描述

cv::drawMarker 函数在 OpenCV 中用于在一个给定的位置上绘制标记。目前支持几种不同的标记类型，具体信息可以参考 MarkerTypes

函数原型

void cv::drawMarker	
(InputOutputArray 	img,Point 	position,const Scalar & 	color,int 	markerType = MARKER_CROSS,int 	markerSize = 20,int 	thickness = 1,int 	line_type = 8 
)

参数

参数img 图像.
参数position 十字准星所在的位置点
参数color 线条颜色
参数markerType 您想要使用的标记类型，参见 MarkerTypes
参数thickness 线条粗细
参数line_type 线条类型，参见 LineTypes
参数markerSize 标记轴的长度 [默认 = 20 像素]

代码示例

#include <iostream>
#include <opencv2/opencv.hpp>int main()
{// 创建一个空白图像cv::Mat image = cv::Mat::zeros( 500, 500, CV_8UC3 );// 设置标记参数cv::Point position( 40, 40 );       // 标记位置cv::Scalar color( 0, 0, 255 );      // 标记颜色（BGR格式）int markerType = cv::MARKER_CROSS;  // 标记类型 十字形标记形状。int markerSize = 50;                // 标记大小int thickness  = 2;                 // 标记线条厚度int line_type  = cv::LINE_8;        // 线条类型// 绘制标记cv::drawMarker( image, position, color, markerType, markerSize, thickness, line_type );// 45度倾斜的十字形标记形状markerType = cv::MARKER_TILTED_CROSS;position   = cv::Point( 90, 90 );cv::drawMarker( image, position, color, markerType, markerSize, thickness, line_type );//星形标记形状，是十字形和倾斜十字形的组合markerType = cv::MARKER_STAR;position   = cv::Point( 150, 150 );cv::drawMarker( image, position, color, markerType, markerSize, thickness, line_type );//菱形标记形状。markerType = cv::MARKER_DIAMOND;position   = cv::Point( 210, 210 );cv::drawMarker( image, position, color, markerType, markerSize, thickness, line_type );//  正方形标记形状。markerType = cv::MARKER_SQUARE;position   = cv::Point( 270, 270 );cv::drawMarker( image, position, color, markerType, markerSize, thickness, line_type );// 向上的三角形标记形状markerType = cv::MARKER_TRIANGLE_UP;position   = cv::Point( 330, 330 );cv::drawMarker( image, position, color, markerType, markerSize, thickness, line_type );//向下的三角形标记形状markerType = cv::MARKER_TRIANGLE_DOWN;position   = cv::Point( 400, 400 );cv::drawMarker( image, position, color, markerType, markerSize, thickness, line_type );// 显示图像cv::imshow( "Marker Drawing", image );cv::waitKey( 0 );return 0;
}