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把检测出的人脸用椭圆画出。使用opencv中自带的haarcascades
#include "opencv2/core/core.hpp" #include "opencv2/objdetect/objdetect.hpp" #include "opencv2/highgui/highgui.hpp" #include "opencv2/imgproc/imgproc.hpp" #include <iostream> #include <stdio.h> using namespace std; using namespace cv; string face_cascade_name = "D:\\opencv\\sources\\data\\haarcascades\\haarcascade_frontalface_alt.xml"; //该文件存在于OpenCV安装目录下的\sources\data\haarcascades内,需要将该xml文件复制到当前工程目录下 CascadeClassifier face_cascade; void detectAndDisplay(Mat frame); int main(int argc, char** argv){ Mat image; image = imread("E:\\Work\\libfacedetection-master\\11.jpg", 1); //当前工程的image目录下的mm.jpg文件,注意目录符号 if (!face_cascade.load(face_cascade_name)){ printf("级联分类器错误,可能未找到文件,拷贝该文件到工程目录下!\n"); return -1; } detectAndDisplay(image); //调用人脸检测函数 waitKey(0); //暂停显示一下。 } void detectAndDisplay(Mat face){ std::vector<Rect> faces; Mat face_gray; cvtColor(face, face_gray, CV_BGR2GRAY); //rgb类型转换为灰度类型 equalizeHist(face_gray, face_gray); //直方图均衡化 face_cascade.detectMultiScale(face_gray, faces, 1.1, 2, 0 | CV_HAAR_SCALE_IMAGE, Size(1, 1)); for (int i = 0; i < faces.size(); i++){ Point center(faces[i].x + faces[i].width*0.5, faces[i].y + faces[i].height*0.5); ellipse(face, center, Size(faces[i].width*0.5, faces[i].height*0.5), 0, 0, 360, Scalar(255, 0, 0), 2, 7, 0); } namedWindow("人脸检测", CV_WINDOW_NORMAL); imshow("人脸检测", face); }
绘制椭圆圆弧和椭圆扇形。
void cvEllipse( CvArr* img, CvPoint center, CvSize axes, double angle, double start_angle, double end_angle, CvScalar color, int thickness=1, int line_type=8, int shift=0 );
C++: void ellipse(Mat&img, Pointcenter, Size axes, doubleangle, doublestartAngle, double endAngle, const Scalar&color, intthickness=1, int lineType=8, intshift=0)
C++: void ellipse(Mat&img, const RotatedRect&box, const Scalar& color, int thickness=1, intlineType=8)
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原文地址:http://blog.csdn.net/gongxs7/article/details/51338887