opencv视频取帧并进行人脸检测（Windows和Linux双版本）

Windows版本

环境win7+vs2015+opencv2.4.10

直接给代码：

#include "highgui.h"  #include "objdetect/objdetect.hpp"#include "imgproc/imgproc.hpp"using namespace cv;String face_cascade_name = "E:\\rszj\\software\\opencv\\sources\\data\\lbpcascades\\lbpcascade_frontalface.xml";String eyes_cascade_name = "E:\\rszj\\software\\opencv\\sources\\data\\haarcascades\\haarcascade_eye_tree_eyeglasses.xml";CascadeClassifier face_cascade;CascadeClassifier eyes_cascade;void detectAndDisplay(char* window_name, IplImage* frameSrc){Mat frame = Mat(frameSrc);std::vector<Rect> faces;Mat frame_gray;cvtColor(frame, frame_gray, COLOR_BGR2GRAY);equalizeHist(frame_gray, frame_gray);//-- Detect facesface_cascade.detectMultiScale(frame_gray, faces, 1.1, 2, 0, Size(80, 80));for (size_t i = 0; i < faces.size(); i++){Mat faceROI = frame_gray(faces[i]);std::vector<Rect> eyes;//-- In each face, detect eyeseyes_cascade.detectMultiScale(faceROI, eyes, 1.1, 2, 0 | CASCADE_SCALE_IMAGE, Size(30, 30));if (eyes.size() == 2){//-- Draw the facePoint center(faces[i].x + faces[i].width / 2, faces[i].y + faces[i].height / 2);ellipse(frame, center, Size(faces[i].width / 2, faces[i].height / 2), 0, 0, 360, Scalar(255, 0, 0), 2, 8, 0);for (size_t j = 0; j < eyes.size(); j++){ //-- Draw the eyesPoint eye_center(faces[i].x + eyes[j].x + eyes[j].width / 2, faces[i].y + eyes[j].y + eyes[j].height / 2);int radius = cvRound((eyes[j].width + eyes[j].height)*0.25);circle(frame, eye_center, radius, Scalar(255, 0, 255), 3, 8, 0);}}}//-- Show what you gotimshow(window_name, frame);}int loadCascade(){if (!face_cascade.load(face_cascade_name)){printf("--(!)Error loading face cascade\n");return -1;};if (!eyes_cascade.load(eyes_cascade_name)){printf("--(!)Error loading eyes cascade\n");return -1;};return 0;}int main(int argc, char* argv[]){if (loadCascade() != 0){printf("Error loading cascade!!");return -1;}cvNamedWindow("avi");CvCapture* capture = cvCreateFileCapture("E:\\rszj\\codes\\c++workspace\\opencv_model\\Debug\\test4.mp4");IplImage* frame;while (1){frame = cvQueryFrame(capture);if (!frame) break;//cvShowImage("avi", frame);detectAndDisplay("avi", frame);char c = cvWaitKey(50);if (c == 27)break;}cvReleaseCapture(&capture);cvDestroyWindow("avi");return 0;}

Linux：

环境：Ubuntu14.04 + opencv2.4.9

#include "stdio.h"#include "highgui.h"#include "objdetect/objdetect.hpp"#include "imgproc/imgproc.hpp"using namespace cv;//using namespace std;string face_cascade_name = "/home/rszj/yanjie/codes/opencv/lbpcascade_frontalface.xml";string eyes_cascade_name = "/home/rszj/yanjie/codes/opencv/haarcascade_eye_tree_eyeglasses.xml";CascadeClassifier face_cascade;CascadeClassifier eyes_cascade;void detectAndDisplay(string window_name, IplImage* frameSrc){    Mat frame = Mat(frameSrc);std::vector<Rect> faces;Mat frame_gray;cvtColor(frame, frame_gray, COLOR_BGR2GRAY);equalizeHist(frame_gray, frame_gray);//-- Detect facesface_cascade.detectMultiScale(frame_gray, faces, 1.1, 2, 0, Size(80, 80));for (size_t i = 0; i < faces.size(); i++){Mat faceROI = frame_gray(faces[i]);std::vector<Rect> eyes;//-- In each face, detect eyeseyes_cascade.detectMultiScale(faceROI, eyes, 1.1, 2, 0 | CASCADE_SCALE_IMAGE, Size(30, 30));if (eyes.size() == 2){//-- Draw the facePoint center(faces[i].x + faces[i].width / 2, faces[i].y + faces[i].height / 2);ellipse(frame, center, Size(faces[i].width / 2, faces[i].height / 2), 0, 0, 360, Scalar(255, 0, 0), 2, 8, 0);for (size_t j = 0; j < eyes.size(); j++){ //-- Draw the eyesPoint eye_center(faces[i].x + eyes[j].x + eyes[j].width / 2, faces[i].y + eyes[j].y + eyes[j].height / 2);int radius = cvRound((eyes[j].width + eyes[j].height)*0.25);circle(frame, eye_center, radius, Scalar(255, 0, 255), 3, 8, 0);}}}//-- Show what you gotimshow(window_name, frame);}int loadCascade(){if (!face_cascade.load(face_cascade_name)){printf("--(!)Error loading face cascade\n");return -1;};if (!eyes_cascade.load(eyes_cascade_name)){printf("--(!)Error loading eyes cascade\n");return -1;};return 0;}int main(int argc, char* argv[]){if (loadCascade() != 0){printf("Error loading cascade!!");return -1;}cvNamedWindow("avi");CvCapture* capture = cvCreateFileCapture("test4.mp4");IplImage* frame;while (1){frame = cvQueryFrame(capture);if (!frame) break;//cvShowImage("avi", frame);detectAndDisplay("avi", frame);char c = cvWaitKey(20);if (c == 27)break;}cvReleaseCapture(&capture);cvDestroyWindow("avi");return 0;}

Makefile：

CFLAGS = `pkg-config --cflags opencv` -I/usr/include/opencv2LIBS = `pkg-config --libs opencv`CC = g++clean:    rm -f *.o *~ testmain:main.cpp    $(CC) $+ $(CFLAGS) $(LIBS) -o main.o  

编译用：make main

PS：这里Makefile要记住一点：

顺序一定要：$(CC) $+ $(CFLAGS) $(LIBS) -o main.o 而不能用：$(CC)  $(CFLAGS) $(LIBS) -o main.o $+  

不然会出现：“对‘cv::Mat::Mat(_IplImage const*, bool)’未定义的引用”之类的错误。

具体原因我也没搞懂，我测试了一下：

g++  -o main.o main.cpp`pkg-config --cflags opencv` -I/usr/include/opencv2 `pkg-config --libs opencv`#这个是OK的    

而

g++ `pkg-config --cflags opencv` -I/usr/include/opencv2 `pkg-config --libs opencv` -o main.o main.cpp  #这个就是不行的，反而按照规范这个才是正确写法吧

原因没搞懂，望有经验的同学予以指正。