OpenCV_Draw the Shape Descriptor(绘制图像的形状描述符)

叁歲伎倆 2022-09-30 14:46 173阅读 0赞

#include "stdafx.h"
    #include <opencv2/core/core.hpp>
    #include <opencv2/highgui/highgui.hpp>
    #include <opencv2/imgproc/imgproc.hpp>
    #include <iostream>
    
    
    int main()
    {
    	cv::Mat original = cv::imread("../../aTestImage/cow.jpg", 1);
    	cv::Mat image = cv::imread("../../aTestImage/cow.jpg", 0);
    	if (!image.data)  return 0;
    	cv::Mat binary;
    	cv::threshold(image, binary, 60, 255, CV_THRESH_BINARY_INV);//获取二值图像
    
    	cv::Mat element5(5, 5, CV_8U, cv::Scalar(255));//自定义结构元素5x5
    	cv::morphologyEx(binary, binary, cv::MORPH_CLOSE, element5);//闭运算
    	cv::morphologyEx(binary, binary, cv::MORPH_OPEN, element5);//开运算
    
    	std::vector <std::vector<cv::Point>>contours;
    	//从经过开闭运算的二值图像中提取轮廓
    	cv::findContours(binary, contours, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_NONE);//获取所有external轮廓
         
    	 //画轮廓到白色背景图片上
    	cv::Mat result(image.size(), CV_8U, cv::Scalar(255));//定义8位纯白图片一张
    	cv::drawContours(result, contours, -1, cv::Scalar(0), 1);
    	cv::namedWindow("result");
    	cv::imshow("result", result);
    
    	//1.测试包围盒
    	cv::Rect r0 = cv::boundingRect(cv::Mat(contours[2]));//将第3个轮廓包围成矩形
    	cv::rectangle(result, r0, cv::Scalar(0), 2);//灰度0，线宽2
    
    	//2.测试最小包围圈
    	float radius;
    	cv::Point2f center;
    	cv::minEnclosingCircle(cv::Mat(contours[4]), center, radius);//将第5个轮廓包围成圆
    	cv::circle(result, cv::Point(center), static_cast<int>(radius), cv::Scalar(0), 2);
    
    	//3.测试多边形
    	std::vector<cv::Point> poly;
    	cv::approxPolyDP(cv::Mat(contours[5]), poly, 5, true);//将轮廓分解成点集放入向量poly中
    	std::vector<cv::Point>::const_iterator itp = poly.begin();
    	//遍历每个线段进行绘制
    	while (itp != poly.end() - 1)
    	{
    		cv::line(result, *itp, *(itp + 1), cv::Scalar(0), 2);
    		++itp;
    	}
    	//首未用直线相连
    	cv::line(result ,*(poly.begin()), *(poly.end() -1), cv::Scalar(0), 2);
    
    	//4.测试凹包
    	std::vector<cv::Point> hull;
    	cv::convexHull(cv::Mat(contours[6]), hull);
    	std::vector<cv::Point>::const_iterator ith = hull.begin();
    	//遍历每个线段进行绘制
    	while (ith != hull.end() - 1)
    	{
    		cv::line(result, *ith, *(ith + 1), cv::Scalar(0), 2);
    		++ith;
    	}
    	//首未用直线相连
    	cv::line(result, *(hull.begin()), *(hull.end() - 1), cv::Scalar(0), 2);
    
    	//5.测试力矩 遍历所有轮廓 
    	std::vector<std::vector<cv::Point>>::const_iterator itc = contours.begin();
    	while (itc != contours.end())
    	{
    		cv::Moments mom = cv::moments(cv::Mat(*itc));
    		*itc++;
    		cv::circle(result, cv::Point(mom.m10 / mom.m00, mom.m01 / mom.m00), 2, cv::Scalar(0), 2);//画出质心坐标
    	}
    
    	cv::namedWindow("result1");
    	cv::imshow("result1", result);
    	cv::waitKey(0);
    	return 0;
    }

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[20170323003226742]: /images/20220705/9fab559775ed44efa7c3d94be94cc875.png