opencv [c++] 轮廓查找与绘制及轮廓特征属性的应用

#include
#include
#include
#include

using namespace std;
using namespace cv;


Mat src, temp;
vector> contours;
vector hierarchy;
int main() 
{
	src = imread("src1.png");   //待搜索图像
	temp = src.clone();  //原图克隆图像
	cvtColor(src, src, COLOR_BGR2GRAY);
	threshold(src, src, 100, 255, THRESH_BINARY);
	imshow("src", src);
	//查找轮廓并绘制轮廓【查找轮廓之前要将输入凸显转化为二值图】
	findContours(src, contours, hierarchy,RETR_LIST,CHAIN_APPROX_SIMPLE);
	drawContours(temp, contours, -1, Scalar(0, 255, 0), 2, 8);
	imshow("temp", temp);



	waitKey(0);

}

#include
#include
#include
#include

using namespace std;
using namespace cv;


int main() 
{
	Mat src = imread("1.png");   //读取图像
	Mat dst = src.clone();  //原图的克隆图像
	cvtColor(src, src, COLOR_BGR2GRAY);  //灰度化
	threshold(src, src, 100, 255, THRESH_BINARY_INV);
	//imshow("src", src);
	vector> contours;
	vector hierachy;
	findContours(src, contours, hierachy, RETR_EXTERNAL, CHAIN_APPROX_NONE);
	//drawContours(dst, contours, -1, Scalar(0, 255, 0), 2, 8);
	//imshow("dst", dst);
	//应用凸包检测
	vector> hull(contours.size());
	for (int i = 0; i < contours.size(); i++)
	{
		convexHull(contours[i], hull[i], true);  //为每一个轮廓都查找凸包
	}
	for (int i = 0; i < contours.size(); i++)
	{
		drawContours(dst, contours, i, Scalar(0, 255, 255), 2, 8); //绘制轮廓
		drawContours(dst, hull, i, Scalar(0, 255, 0), 2, 8); //绘制轮廓
	}
	imshow("hull", dst);

	waitKey(0);

}

#include
#include
#include
#include

using namespace std;
using namespace cv;


int main()
{
	Mat src = imread("1.png");   //读取图像
	Mat dst = src.clone();  //原图的克隆图像
	cvtColor(src, src, COLOR_BGR2GRAY);  //灰度化
	threshold(src, src, 100, 255, THRESH_BINARY_INV);  //二值化
	//imshow("src", src);
	vector> contours;
	vector hierarchy;
	findContours(src, contours, hierarchy, RETR_EXTERNAL, CHAIN_APPROX_NONE);  //查找轮廓

	//画出轮廓并绘制矩形
	vector boundRect(contours.size());    //定义外接矩形的集合
	drawContours(dst, contours, -1, Scalar(0, 255, 255), 2, 8); //绘制轮廓
	//遍历每一个轮廓，对每一个轮廓画 Rectangle1
	for (int i = 0; i < contours.size(); i++)
	{
		boundRect[i] = boundingRect((Mat)contours[i]);   //查找每一个外界矩形
		rectangle(dst, boundRect[i], Scalar(0,255,0),2,8);
	}
	

	imshow("dst", dst);

	waitKey(0);

}