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 faces
face_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 eyes
eyes_cascade.detectMultiScale(faceROI, eyes, 1.1, 2, 0 | CASCADE_SCALE_IMAGE, Size(30, 30));
if (eyes.size() == 2)
{
//-- Draw the face
Point 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 eyes
Point 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 got
imshow(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 faces
face_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 eyes
eyes_cascade.detectMultiScale(faceROI, eyes, 1.1, 2, 0 | CASCADE_SCALE_IMAGE, Size(30, 30));
if (eyes.size() == 2)
{
//-- Draw the face
Point 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 eyes
Point 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 got
imshow(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/opencv2
LIBS = `pkg-config --libs opencv`

CC = g++

clean:
rm -f *.o *~ test

main: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。