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1.轮廓外接最大矩形boundingRect()
2.轮廓外接最小矩形minAreaRect()
3.轮廓外接多边形approxPolyDP() 1.轮廓外接最大矩形boundingRect() Rect cv::boundingRect ( InputArray array ) array:输入的灰度图像或者2D点集#xff0c;数据类型为vectorPoint或者M…目录
1.轮廓外接最大矩形boundingRect()
2.轮廓外接最小矩形minAreaRect()
3.轮廓外接多边形approxPolyDP() 1.轮廓外接最大矩形boundingRect() Rect cv::boundingRect ( InputArray array ) array:输入的灰度图像或者2D点集数据类型为vectorPoint或者Mat。
示例代码
//轮廓最大外接矩阵
void Contour_external_maxmatrix(Mat image) {Mat gray,binary;cvtColor(image,gray,COLOR_BGR2GRAY);//灰度化GaussianBlur(gray,gray,Size(9,9),2,2);//滤波threshold(gray,binary,170,255,THRESH_BINARY|THRESH_OTSU);//自适应二值化//轮廓检测vectorvectorPoint contours;//轮廓vectorVec4i hierarchy;//存放轮廓结构变量findContours(binary,contours,hierarchy,RETR_TREE,CHAIN_APPROX_SIMPLE,Point());//寻找轮廓的外接矩阵for(int n0;ncontours.size();n) {//最大外接矩阵Rect rect boundingRect(contours[n]);rectangle(image, rect, Scalar(7, 67, 255), 2, 8, 0);}imwrite(/sdcard/DCIM/max.png,image);
} 轮廓外接最大矩形的结果 2.轮廓外接最小矩形minAreaRect() RotatedRect cv::minAreaRect ( InputArray points ) array:输入的灰度图像或者2D点集数据类型为vectorPoint或者Mat。
示例代码 //轮廓最小外接矩阵
void Contour_external_minmatrix(Mat image){Mat gray,binary;cvtColor(image,gray,COLOR_BGR2GRAY);//灰度化GaussianBlur(gray,gray,Size(9,9),2,2);//滤波threshold(gray,binary,170,255,THRESH_BINARY|THRESH_OTSU);//自适应二值化//轮廓检测vectorvectorPoint contours;//轮廓vectorVec4i hierarchy;//存放轮廓结构变量findContours(binary,contours,hierarchy,RETR_TREE,CHAIN_APPROX_SIMPLE,Point());//寻找轮廓的外接矩阵for(int n0;ncontours.size();n) {//最小外接矩阵RotatedRect rrect minAreaRect(contours[n]);Point2f points[4];rrect.points(points);//读取最小外接矩阵的四个顶点Point2f cptrrect.center;//最小外接矩阵的中心//绘制旋转矩阵与中心位置for(int i0;i4;i){if(i3){line(image,points[i],points[0],Scalar(0,0,255,255),2,8,0);break;}line(image,points[i],points[i1],Scalar(0,0,255,255),2,8,0);}//绘制矩阵中心circle(image,cpt,4,Scalar(0,0,255,255),-1,8,0);}imwrite(/sdcard/DCIM/min.png,image);}轮廓外接最小矩形的结果 3.轮廓外接多边形approxPolyDP() void cv::approxPolyDP (InputArray curve, OutputArray approxCurve, double epsilon, bool closed curve:输入轮廓像素点。approxCurve:多边形逼近结果以多边形顶点坐标的形式给出epsilon:逼近的精度即原始曲线和逼近曲线之间的最大距离。closed:逼近曲线是否为封闭曲线的标志 true表示曲线封闭即最后一个顶点与第一个顶点相连
示例代码 void drawapp(Mat result,Mat img2){for(int i0;iresult.rows;i){//最后一个坐标点与第一个坐标点连接if(iresult.rows-1){Vec2i point1result.atVec2i(i);Vec2i point2result.atVec2i(0);line(img2,point1,point2,Scalar(0,0,255,255),4,8,0);break;}Vec2i point1result.atVec2i(i);Vec2i point2result.atVec2i(i1);line(img2,point1,point2,Scalar(0,0,255,255),4,8,0);}}//轮廓多边形拟合
void Contour_external_matrix(Mat image){Mat gray,binary;cvtColor(image,gray,COLOR_BGR2GRAY);//灰度化// GaussianBlur(gray,gray,Size(9,9),2,2);//滤波// threshold(gray,binary,170,255,THRESH_BINARY|THRESH_OTSU);//自适应二值化//轮廓的发现与绘制vectorvectorPoint contours;//轮廓vectorVec4i hierarchy;//存放轮廓结构变量findContours(gray,contours,hierarchy,RETR_TREE,CHAIN_APPROX_SIMPLE,Point());//绘制多边形for(int n0;ncontours.size();n) {//用最小外接矩阵求取轮廓中心RotatedRect rrect minAreaRect(contours[n]);Point2f centerrrect.center;//最小外接矩阵的中心circle(image,center,2,Scalar(0,0,255,255),2,8,0);Mat result;approxPolyDP(contours[n],result,4,true);//多边形拟合drawapp(result,image);}imwrite(/sdcard/DCIM/matrix.png,image);}
多边形拟合的结果
