vs下opencv的人脸检测以及qt下dll的封装调用（二、dll的创建）

一、vs下新建main.cpp

// dllmain.cpp : 定义 DLL 应用程序的入口点。
#include <windows.h>
BOOL APIENTRY DllMain(HMODULE hModule,
DWORD  ul_reason_for_call,
LPVOID lpReserved
)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}

二、新建detectdll.cpp

#include "opencv/cv.hpp"
#include "opencv2/objdetect/objdetect.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <time.h>
#include <iostream>
#include <stdio.h>
#include <opencv2/opencv.hpp>
#include <opencv2/imgproc/imgproc.hpp>
using namespace std;
using namespace cv;
IplImage* cutImage(IplImage* src, CvRect rect) {
cvSetImageROI(src, rect);
IplImage* dst = cvCreateImage(cvSize(rect.width, rect.height),

src->depth,
src->nChannels);

cvCopy(src, dst, 0);
cvResetImageROI(src);
return dst;
}

IplImage* detect1(Mat& img, CascadeClassifier& cascade, double scale)
{
int i = 0;
double t = 0;
vector<Rect> faces;
Mat gray, smallImg(cvRound(img.rows / scale), cvRound(img.cols / scale), CV_8UC1);

cvtColor(img, gray, CV_BGR2GRAY);
resize(gray, smallImg, smallImg.size(), 0, 0, INTER_LINEAR);
equalizeHist(smallImg, smallImg);

t = (double)cvGetTickCount();
cascade.detectMultiScale(smallImg, faces,
1.3, 2, CV_HAAR_SCALE_IMAGE,
Size(80, 80));
t = (double)cvGetTickCount() - t;
printf("detection time = %g ms\n", t / ((double)cvGetTickFrequency()*1000.));
for (vector<Rect>::const_iterator r = faces.begin(); r != faces.end(); r++, i++)
{
IplImage* temp = cutImage(&(IplImage(img)), cvRect(r->x, r->y, r->width, r->height));
return temp;
}

return NULL;
}

IplImage* det(Mat srcImg, char* path, String cascadeName){

IplImage *dst1 = 0; //目标图像指针
IplImage *dst2 = 0; //目标图像指针
CvSize dst_cvsize; //目标图像尺寸
CascadeClassifier cascade;
if (!cascade.load(cascadeName))
{
cout << "cascade not load" << endl;
}

IplImage* faceImage1;
clock_t start2, finish2;
double totaltime2;
start2 = clock();
faceImage1 = detect1(srcImg, cascade, 1);
finish2 = clock();
totaltime2 = (double)(finish2 - start2) / CLOCKS_PER_SEC;
std::cout << "detectface time is :" << totaltime2 << "sec" << std::endl;

if (faceImage1 == NULL) {

cout << "no image" << endl;
}

dst_cvsize.width = 224; //目标图像的宽为源图象宽的scale倍
dst_cvsize.height = 224; //目标图像的高为源图象高的scale倍

dst1 = cvCreateImage(dst_cvsize, faceImage1->depth, faceImage1->nChannels); //构造目标图象
// cvResize(src, dst, CV_INTER_LINEAR); //缩放源图像到目标图像
cvResize(faceImage1, dst1, CV_INTER_CUBIC); //缩放源图像到目标图像

cvSaveImage(path, dst1, 0);

// cvSaveImage("d:\\face.jpg", faceImage1, 0);

cv::Mat im1 = cv::cvarrToMat(dst1);

cvReleaseImage(&faceImage1);
return dst1;

}三、新建头文件detectdll.h
#include "opencv/cv.hpp"
#include "opencv2/objdetect/objdetect.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <time.h>
#include <iostream>
#include <stdio.h>
#include <opencv2/opencv.hpp>
#include <opencv2/imgproc/imgproc.hpp>
using namespace std;
using namespace cv;

IplImage* cutImage(IplImage* src, CvRect rect);
IplImage* detect1(Mat& img, CascadeClassifier& cascade, double scale);
IplImage* det(Mat srcImg, char* path, String cascadeName);四、新建source.def
把函数写在这里，然后空格@+数字，如果某个函数报错，试着改个名字（我的detect函数一直抱错，换成detect1就好了）

LIBRARY "detectdll"
EXPORTS
cutImage @1
detect1 @2
det @3 五、重新生成就好拉