vs下opencv的人脸检测以及qt下dll的封装调用（二、dll的创建）

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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

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