Qt中的人脸检测和opencv

Question

我用C++编写了一些使用opencv库进行人脸检测的代码。在这里，我正在用脸控制鼠标指针。当我写Qt中相同的代码，它不会加载haarcascade XML文件

这里是我的C++代码：

#include<opencv2/opencv.hpp> 
#include<opencv2/highgui/highgui.hpp> 
#include<time.h> 
#include<stdio.h> 
#include<stdlib.h> 
using namespace std; 
using namespace cv; 

CascadeClassifier faceCade; 

String faceCascadeName = "lbpcascade_frontalface.xml"; 
String FaceDetectWindow = "Face Detector Window"; 
String FaceDetectGrayWindow = "Face Detector Gray Window"; 


int main() { 

    VideoCapture cap(0); 
    Mat camFrames, grayFrames; 
    vector<Rect> faces; 
    long imageIndex = 0; 

    int preX=0,preY=0; 
    int j=0; 

    if(!faceCade.load(faceCascadeName)){ cout<<"--(!)Error loading\n"; return -1; }; 

    while (1) { 
     cap >> camFrames; 

     cvtColor(camFrames, grayFrames, CV_BGR2GRAY); 
     equalizeHist(grayFrames, grayFrames); 

     faceCade.detectMultiScale(grayFrames, faces, 1.1, 2, 0, Size(160, 160)); 

     for (int i = 0; i < faces.size(); i++) 
     { 
      Mat faceROI = grayFrames(faces[i]); 

      rectangle(camFrames, Rect(faces[i].x - 25,faces[i].y - 25,faces[i].width + 35 ,faces[i].height + 35), Scalar(0, 0, 255), 1, 1, 0); 

      Point center(faces[i].x + faces[i].width * 0.5,faces[i].y + faces[i].height * 0.5); 


      cout<<"\nx = "<<faces[i].x<<"\ty = "<<faces[i].y; 

      //while(j==10) 
      //{ 
      if((faces[i].y<125)&&(faces[i].x<255)) 
      { 
       printf(" RU"); 
       system("xte 'mousermove 10 -10'"); 
       } 
      else if((faces[i].y>185)&&(faces[i].x<255)){ 
        printf(" RD"); 
        system("xte 'mousermove 10 10'"); 
        } 
      else if((faces[i].y>185)&&(faces[i].x>305)){ 
        printf(" LD"); 
        system("xte 'mousermove -10 10'"); 
        } 
      else if((faces[i].y<125)&&(faces[i].x<255)){ 
        printf(" LU"); 
        system("xte 'mousermove -10 -10'"); 
        } 
       else if((faces[i].y>185)&&(faces[i].x>255)&&(faces[i].x<305)){ 
        printf(" Down"); 
        system("xte 'mousermove 0 10'"); 
        } 
       else if((faces[i].y<125)&&(faces[i].x>255)&&(faces[i].x<305)){ 
        printf(" up"); 
        system("xte 'mousermove 0 -10'"); 
        } 
       else if((faces[i].y>125)&&(faces[i].y<185)&&(faces[i].x<255)){ 
        printf(" L"); 
        system("xte 'mousermove -10 0'"); 
        } 
      else if((faces[i].y>125)&&(faces[i].y<185)&&(faces[i].x>305)){ 
        printf(" R"); 
        system("xte 'mousermove 10 0'"); 
        } 
       preX = faces[i].x; 
       preY = faces[i].y; 
       j=0; 
       } 
     //j++; 
     //} 

     imshow(FaceDetectWindow, camFrames); 
     imshow(FaceDetectGrayWindow, grayFrames); 
     if(waitKey(30) >= 0) break; 

    } 

} 

这里检测到面部，但在它下面的Qt代码不工作

#include<opencv2/opencv.hpp> 
#include<opencv2/highgui/highgui.hpp> 
#include<time.h> 
#include<stdio.h> 
#include<stdlib.h> 
using namespace std; 
using namespace cv; 

CascadeClassifier faceCade; 

String faceCascadeName = ":/new/prefix1/lbpcascade_frontalface.xml"; 
String FaceDetectWindow = "Face Detector Window"; 
String FaceDetectGrayWindow = "Face Detector Gray Window"; 


int main() { 

    VideoCapture cap(0); 
    Mat camFrames, grayFrames; 
    vector<Rect> faces; 
    long imageIndex = 0; 

    int preX=0,preY=0; 
    int j=0; 

    if(!faceCade.load("lbpcascade_frontalface.xml")){ cout<<"--(!)Error loading\n"; return -1; }; 

    while (1) { 
     cap >> camFrames; 

     cvtColor(camFrames, grayFrames, CV_BGR2GRAY); 
     equalizeHist(grayFrames, grayFrames); 

     faceCade.detectMultiScale(grayFrames, faces, 1.1, 2, 0, Size(80, 80)); 

    /* for (int i = 0; i < faces.size(); i++) 
     { 
      Mat faceROI = grayFrames(faces[i]); 

      rectangle(camFrames, Rect(faces[i].x - 25,faces[i].y - 25,faces[i].width + 35 ,faces[i].height + 35), Scalar(0, 0, 255), 1, 1, 0); 

      Point center(faces[i].x + faces[i].width * 0.5,faces[i].y + faces[i].height * 0.5); 


      cout<<"\nx = "<<faces[i].x<<"\ty = "<<faces[i].y; 

      //while(j==10) 
      //{ 
      if((faces[i].y<125)&&(faces[i].x<255)) 
      { 
       printf(" RU"); 
       system("xte 'mousermove 10 -10'"); 
       } 
      else if((faces[i].y>185)&&(faces[i].x<255)){ 
        printf(" RD"); 
        system("xte 'mousermove 10 10'"); 
        } 
      else if((faces[i].y>185)&&(faces[i].x>305)){ 
        printf(" LD"); 
        system("xte 'mousermove -10 10'"); 
        } 
      else if((faces[i].y<125)&&(faces[i].x<255)){ 
        printf(" LU"); 
        system("xte 'mousermove -10 -10'"); 
        } 
       else if((faces[i].y>185)&&(faces[i].x>255)&&(faces[i].x<305)){ 
        printf(" Down"); 
        system("xte 'mousermove 0 10'"); 
        } 
       else if((faces[i].y<125)&&(faces[i].x>255)&&(faces[i].x<305)){ 
        printf(" up"); 
        system("xte 'mousermove 0 -10'"); 
        } 
       else if((faces[i].y>125)&&(faces[i].y<185)&&(faces[i].x<255)){ 
        printf(" L"); 
        system("xte 'mousermove -10 0'"); 
        } 
      else if((faces[i].y>125)&&(faces[i].y<185)&&(faces[i].x>305)){ 
        printf(" R"); 
        system("xte 'mousermove 10 0'"); 
        } 
       preX = faces[i].x; 
       preY = faces[i].y; 
       j=0; 
       } 
      //j++; 
     //}*/ 

     imshow(FaceDetectWindow, camFrames); 
     imshow(FaceDetectGrayWindow, grayFrames); 
     if(waitKey(30) >= 0) break; 

    } 

} 

请帮我做，在QT平台 这里Qt代码所示的输出是 - （！）错误加载 这意味着级联文件未加载

Answer 1

下面的路径似乎并不正确：

String faceCascadeName = ":/new/prefix1/lbpcascade_frontalface.xml"; 

Answer 2

String faceCascadeName = ":/new/prefix1/lbpcascade_frontalface.xml"; 

这是一个有效的路径，但你需要在Qt的资源文件来创建它。

http://qt-project.org/doc/qt-5.0/qtcore/resources.html

否则，如果你不想处理资源，走并使其相对路径。

例如：

"./file.xml"将寻求从工作目录中的XML文件。

"../file.xml"将查找工作目录上一级的xml文件。

希望有所帮助。