Linux 下 QT 配合 OpenCV 完成图像处理 (实现基本的人脸检测)

QT       += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
CONFIG += c++11
# The following define makes your compiler emit warnings if you use# any Qt feature that has been marked deprecated (the exact warnings# depend on your compiler). Please consult the documentation of the# deprecated API in order to know how to port your code away from it.DEFINES += QT_DEPRECATED_WARNINGS
# You can also make your code fail to compile if it uses deprecated APIs.# In order to do so, uncomment the following line.# You can also select to disable deprecated APIs only up to a certain version of Qt.#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
SOURCES += \    main.cpp \    widget.cpp
HEADERS += \    widget.h
FORMS += \    widget.ui
# Default rules for deployment.qnx: target.path = /tmp/$${TARGET}/binelse: unix:!android: target.path = /opt/$${TARGET}/bin!isEmpty(target.path): INSTALLS += target
#linu平台的路径设置linux {#添加opencv头文件的路径，需要根据自己的头文件路径进行修改INCLUDEPATH+=/home/wbyq/work_pc/opencv-3.4.9/_install/install/include\             /home/wbyq/work_pc/opencv-3.4.9/_install/install/include/opencv\             /home/wbyq/work_pc/opencv-3.4.9/_install/install/include/opencv2
LIBS+=/home/wbyq/work_pc/opencv-3.4.9/_install/install/lib/libopencv_calib3d.soLIBS+=/home/wbyq/work_pc/opencv-3.4.9/_install/install/lib/libopencv_core.soLIBS+=/home/wbyq/work_pc/opencv-3.4.9/_install/install/lib/libopencv_dnn.soLIBS+=/home/wbyq/work_pc/opencv-3.4.9/_install/install/lib/libopencv_features2d.soLIBS+=/home/wbyq/work_pc/opencv-3.4.9/_install/install/lib/libopencv_flann.soLIBS+=/home/wbyq/work_pc/opencv-3.4.9/_install/install/lib/libopencv_highgui.soLIBS+=/home/wbyq/work_pc/opencv-3.4.9/_install/install/lib/libopencv_imgcodecs.soLIBS+=/home/wbyq/work_pc/opencv-3.4.9/_install/install/lib/libopencv_imgproc.soLIBS+=/home/wbyq/work_pc/opencv-3.4.9/_install/install/lib/libopencv_ml.soLIBS+=/home/wbyq/work_pc/opencv-3.4.9/_install/install/lib/libopencv_objdetect.soLIBS+=/home/wbyq/work_pc/opencv-3.4.9/_install/install/lib/libopencv_photo.soLIBS+=/home/wbyq/work_pc/opencv-3.4.9/_install/install/lib/libopencv_shape.soLIBS+=/home/wbyq/work_pc/opencv-3.4.9/_install/install/lib/libopencv_stitching.soLIBS+=/home/wbyq/work_pc/opencv-3.4.9/_install/install/lib/libopencv_superres.soLIBS+=/home/wbyq/work_pc/opencv-3.4.9/_install/install/lib/libopencv_videoio.soLIBS+=/home/wbyq/work_pc/opencv-3.4.9/_install/install/lib/libopencv_video.so}

#include "widget.h"#include "ui_widget.h"
Widget::Widget(QWidget *parent)    : QWidget(parent)    , ui(new Ui::Widget){    ui->setupUi(this);    opencv_face();}
Widget::~Widget(){    delete ui;}
//分类器的路径#define source_xml_addr "/home/wbyq/work_pc/opencv-3.4.9/data/haarcascades_cuda/haarcascade_frontalface_alt2.xml"
//将要检测的图片路径#define source_pix_addr "/mnt/hgfs/linux-share-dir/1.jpg"
//人脸检测代码void Widget::opencv_face(){    static CvMemStorage* storage = 0;    static CvHaarClassifierCascade* cascade = 0;
    fprintf( stderr, "start------------------------------>1 \n" );
    const char*cascade_name =source_xml_addr;
    //加载分类器    cascade = (CvHaarClassifierCascade*)cvLoad( cascade_name, 0, 0, 0 );    if( !cascade )    {        fprintf( stderr, "ERROR: Could not load classifier cascade\n" );        return ;    }
    //创建内存空间    storage = cvCreateMemStorage(0);
    //加载需要检测的图片    const char* filename =source_pix_addr;    IplImage* img = cvLoadImage( filename, 1 );
    if(img ==nullptr )    {        fprintf( stderr, "jpg load error! \n" );        return;    }
     fprintf( stderr, "start------------------------------>2 \n" );
    double scale=1.2;    static CvScalar colors[] = {        {{0,0,255}},{{0,128,255}},{{0,255,255}},{{0,255,0}},        {{255,128,0}},{{255,255,0}},{{255,0,0}},{{255,0,255}}    };//Just some pretty colors to draw with

    IplImage* gray = cvCreateImage(cvSize(img->width,img->height),8,1);    IplImage* small_img=cvCreateImage(cvSize(cvRound(img->width/scale),cvRound(img->height/scale)),8,1);    cvCvtColor(img,gray, CV_BGR2GRAY);    cvResize(gray, small_img, CV_INTER_LINEAR);
    cvEqualizeHist(small_img,small_img); //直方图均衡
    cvClearMemStorage(storage);
    double t = (double)cvGetTickCount();    CvSeq* objects = cvHaarDetectObjects(small_img,                                           cascade,                                           storage,                                           1.1,                                           2,                                           0/*CV_HAAR_DO_CANNY_PRUNING*/,                                           cvSize(30,30));
       t = (double)cvGetTickCount() - t;
     fprintf( stderr, "start------------------------------>3 \n" );
    //遍历找到对象和周围画盒    for(int i=0;i<(objects->total);++i)    {        CvRect* r=(CvRect*)cvGetSeqElem(objects,i);        cvRectangle(img, cvPoint(r->x*scale,r->y*scale), cvPoint((r->x+r->width)*scale,(r->y+r->height)*scale), colors[i%8]);    }
     fprintf( stderr, "start------------------------------>4 \n" );
    for( int i = 0; i < (objects? objects->total : 0); i++ )    {        CvRect* r = (CvRect*)cvGetSeqElem( objects, i );        CvPoint center;        int radius;        center.x = cvRound((r->x + r->width*0.5)*scale);        center.y = cvRound((r->y + r->height*0.5)*scale);        radius = cvRound((r->width + r->height)*0.25*scale);        cvCircle( img, center, radius, colors[i%8], 3, 8, 0 );    }
    show_face(img);  //显示检测的结果
    cvReleaseImage(&gray);    cvReleaseImage(&small_img);
    //释放图片    cvReleaseImage( &img );}//显示检测的结果void Widget::show_face(IplImage* img){    /*将opecv的图片转为qimage格式*/    uchar *imgData=(uchar *)img->imageData;
    QImage  my_image(imgData,img->width,img->height,QImage::Format_RGB888);    my_image =my_image.rgbSwapped(); //BGR格式转RGB    QPixmap my_pix; //创建画图类
    my_pix.convertFromImage(my_image);
    /*在控件上显示*/    ui->label_display_face->setPixmap(my_pix);}

#ifndef WIDGET_H#define WIDGET_H
#include <QWidget>//opencv include#include <cv.h>#include <cxcore.h>#include <highgui.h>
QT_BEGIN_NAMESPACEnamespace Ui { class Widget; }QT_END_NAMESPACE
class Widget : public QWidget{    Q_OBJECT
public:    Widget(QWidget *parent = nullptr);    void opencv_face();    ~Widget();    void show_face(IplImage* img);private:    Ui::Widget *ui;};#endif // WIDGET_H