108_人脸识别

108 人脸识别

108.1 创建项目

通过QtCreator，在C:\Users\Minwei\Projects\Qt路径下，创建名为Face的项目。

C:\Users\Minwei\Projects\Qt\Face\Face.pro：


xxxxxxxxxx
5
1
...
2
INCLUDEPATH += C:\opencv-3.4.3\build\install\include
3
...
4
LIBS += C:\opencv-3.4.3\build\install\x64\mingw\lib\libopencv_*.a
5
...

108.2 设计界面

C:\Users\Minwei\Projects\Qt\Face\facedialog.ui：


xxxxxxxxxx
74
1
<?xml version="1.0" encoding="UTF-8"?>
2
<ui version="4.0">
3
 <class>FaceDialog</class>
4
 <widget class="QDialog" name="FaceDialog">
5
  <property name="geometry">
6
   <rect>
7
    <x>0</x>
8
    <y>0</y>
9
    <width>107</width>
10
    <height>65</height>
11
   </rect>
12
  </property>
13
  <property name="windowTitle">
14
   <string>人脸识别</string>
15
  </property>
16
  <layout class="QVBoxLayout" name="m_layoutVer">
17
   <item>
18
    <widget class="QLabel" name="m_labImage">
19
     <property name="sizePolicy">
20
      <sizepolicy hsizetype="Preferred" vsizetype="Expanding">
21
       <horstretch>0</horstretch>
22
       <verstretch>0</verstretch>
23
      </sizepolicy>
24
     </property>
25
     <property name="frameShape">
26
      <enum>QFrame::Box</enum>
27
     </property>
28
    </widget>
29
   </item>
30
   <item>
31
    <layout class="QHBoxLayout" name="m_layoutHor">
32
     <item>
33
      <spacer name="m_spacerLeft">
34
       <property name="orientation">
35
        <enum>Qt::Horizontal</enum>
36
       </property>
37
       <property name="sizeHint" stdset="0">
38
        <size>
39
         <width>40</width>
40
         <height>20</height>
41
        </size>
42
       </property>
43
      </spacer>
44
     </item>
45
     <item>
46
      <widget class="QPushButton" name="m_btnRecognize">
47
       <property name="text">
48
        <string>识别</string>
49
       </property>
50
       <property name="default">
51
        <bool>true</bool>
52
       </property>
53
      </widget>
54
     </item>
55
     <item>
56
      <spacer name="m_spacerRight">
57
       <property name="orientation">
58
        <enum>Qt::Horizontal</enum>
59
       </property>
60
       <property name="sizeHint" stdset="0">
61
        <size>
62
         <width>40</width>
63
         <height>20</height>
64
        </size>
65
       </property>
66
      </spacer>
67
     </item>
68
    </layout>
69
   </item>
70
  </layout>
71
 </widget>
72
 <resources/>
73
 <connections/>
74
</ui>

108.3 实现功能

将C:\opencv-3.4.3\build\install\etc\haarcascades目录下的haarcascade_frontalface_alt.xml和haarcascade_eye_tree_eyeglasses.xml文件复制到项目目录下。

C:\Users\Minwei\Projects\Qt\Face\facedialog.h：


xxxxxxxxxx
29
1
#ifndef FACEDIALOG_H
2
#define FACEDIALOG_H
3

4
#include <QDialog>
5

6
#include <opencv2/opencv.hpp>
7
using namespace cv;
8

9
QT_BEGIN_NAMESPACE
10
namespace Ui { class FaceDialog; }
11
QT_END_NAMESPACE
12

13
class FaceDialog : public QDialog
14
{
15
    Q_OBJECT
16

17
public:
18
    FaceDialog(QWidget *parent = nullptr);
19
    ~FaceDialog();
20

21
private slots:
22
    void on_m_btnRecognize_clicked();
23

24
private:
25
    Ui::FaceDialog *ui;
26
    Mat m_image;
27
};
28

29
#endif // FACEDIALOG_H

C:\Users\Minwei\Projects\Qt\Face\facedialog.cpp：


x
1
#include <vector>
2
using namespace std;
3

4
#include "facedialog.h"
5
#include "ui_facedialog.h"
6

7
FaceDialog::FaceDialog(QWidget *parent)
8
    : QDialog(parent)
9
    , ui(new Ui::FaceDialog)
10
{
11
    ui->setupUi(this);
12

13
    cvtColor(imread(QString("tahiti.jpg").toLatin1().data()), m_image, COLOR_BGR2RGB);
14

15
    ui->m_labImage->setPixmap(QPixmap::fromImage(QImage(
16
        m_image.data, m_image.cols, m_image.rows, QImage::Format_RGB888).
17
        scaled(QSize(m_image.cols / 2, m_image.rows / 2), Qt::KeepAspectRatio)));
18

19
    setWindowFlag(Qt::MSWindowsFixedSizeDialogHint);
20
}
21

22
FaceDialog::~FaceDialog()
23
{
24
    delete ui;
25
}
26

27
void FaceDialog::on_m_btnRecognize_clicked()
28
{
29
    ui->m_labImage->setPixmap(QPixmap::fromImage(QImage(
30
        m_image.data, m_image.cols, m_image.rows, QImage::Format_RGB888).
31
        scaled(QSize(m_image.cols / 2, m_image.rows / 2), Qt::KeepAspectRatio)));
32
    ui->m_labImage->repaint();
33

34
    CascadeClassifier faceClassifier;
35
    faceClassifier.load("haarcascade_frontalface_alt.xml");
36
    CascadeClassifier eyesClassifier;
37
    eyesClassifier.load("haarcascade_eye_tree_eyeglasses.xml");
38

39
    Mat gray;
40
    cvtColor(m_image, gray, COLOR_RGB2GRAY);
41
    equalizeHist(gray, gray);
42

43
    Mat canvas = m_image.clone();
44

45
    vector<Rect> faces;
46
    faceClassifier.detectMultiScale(gray, faces);
47
    for (Rect const& face : faces)
48
    {
49
        ellipse(canvas,
50
            Point(face.x + face.width / 2, face.y + face.height / 2),
51
            Size(face.width / 2, face.height / 2), 0, 0, 360,
52
            Scalar(0, 255, 0), 6, 8, 0);
53

54
        vector<Rect> eyes;
55
        eyesClassifier.detectMultiScale(gray(face), eyes);
56
        for (Rect const& eye : eyes)
57
            ellipse(canvas,
58
                Point(face.x + eye.x + eye.width / 2, face.y + eye.y + eye.height / 2),
59
                Size(eye.width / 2, eye.height / 2), 0, 0, 360,
60
                Scalar(0, 255, 0), 6, 8, 0);
61
    }
62

63
    ui->m_labImage->setPixmap(QPixmap::fromImage(QImage(
64
        canvas.data, canvas.cols, canvas.rows, QImage::Format_RGB888).
65
        scaled(QSize(canvas.cols / 2, canvas.rows / 2), Qt::KeepAspectRatio)));
66
}

108.4 测试验证

运行效果如图所示：