一、要求

1、使用百度人脸识别库
2、识别对比图片，获取图片相似度
3、显示最相似的明星照片、显示本人照片
4、调用摄像头拍照、比对查找最相似的明星脸
5、录入明星照片、查看照片列表、修改、删除照片

二、实现方式

2.1百度API封装

1、获取Token

鉴权认证参考：http://ai.baidu.com/ai-doc/REFERENCE/Ck3dwjhhu

填写API_Key和Secret_Key，运行程序后会自动读取，并保存在本地

2、配置https访问

需要依赖libcrypto-1_1.dll和libssl-1_1.dll库，可以在qt路径下找到，放在与exe同级目录下

编译器要选择32位的，62位无效

void BaiduFaceOnline::https_ssl_config(QNetworkRequest& NetworkRequest)
{QSslConfiguration config = NetworkRequest.sslConfiguration();config.setPeerVerifyMode(QSslSocket::VerifyNone);config.setProtocol(QSsl::TlsV1SslV3);NetworkRequest.setSslConfiguration(config);
}

3、相似度比对

访问API，https://aip.baidubce.com/rest/2.0/face/v3/match

使用QEventLoop阻塞等待响应结果

QNetworkReply * reply = NetAccManager->post(NetRequest, post_param);
QEventLoop eventLoop;
connect(reply, &QNetworkReply::finished, &eventLoop, &QEventLoop::quit);
eventLoop.exec(QEventLoop::ExcludeUserInputEvents);

4、QImage转base64编码字符

图片的格式统一位为jpg

QString BaiduFaceOnline::image2base64_str(const QImage& img)
{QByteArray data;QBuffer buf(&data);img.save(&buf, "jpg");QString b64str = QString(data.toBase64());buf.close();return b64str;
}

baidufaceonline.h

#ifndef BAIDUFACEONLINE_H
#define BAIDUFACEONLINE_H#include <QObject>
#include <QNetworkAccessManager>
#include <QNetworkRequest>
#include <QUrl>
#include <QNetworkReply>
#include <QMessageBox>
#include <QImage>
#include <QFile>
#include <QTextStream>
#include <QBuffer>
#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonArray>
#include <QDebug>class BaiduFaceOnline : public QObject
{Q_OBJECT
public:explicit BaiduFaceOnline(QObject *parent = nullptr);void https_ssl_config(QNetworkRequest& NetworkRequest);QString image2base64_str(const QImage& img);QImage base64_str2image(const QString & base64_str);void writeAccToken(const QString& token);QString readAccToken();public slots:void getAccToken();double FaceMatch(const QImage& image1, const QImage& image2);private slots:void getAccTokenReply(QNetworkReply* reply);double getFaceMatchReply(QNetworkReply* reply);private:QNetworkAccessManager* NetAccManager;QNetworkRequest NetRequest;/* 应用参数 */const QString API_Key = "填写自己的";const QString Secret_Key = "填写自己的";QString AccToken = "";/* 应用参数end */const QString FaceMatchUrl = "https://aip.baidubce.com/rest/2.0/face/v3/match";
};#endif // BAIDUFACEONLINE_H

baidufaceonline.cpp

#if _MSC_VER >= 1600
#pragma execution_character_set("utf-8")
#endif#include "baidufaceonline.h"#include <QEventLoop>BaiduFaceOnline::BaiduFaceOnline(QObject *parent) : QObject(parent)
{NetAccManager = new QNetworkAccessManager(this);https_ssl_config(NetRequest);AccToken = readAccToken();qDebug() << "AccToken" <<AccToken;getAccToken();
}//配置https访问，win32依赖libcrypto-1_1.dll和libssl-1_1.dll，放在与exe同级目录下
void BaiduFaceOnline::https_ssl_config(QNetworkRequest& NetworkRequest)
{QSslConfiguration config = NetworkRequest.sslConfiguration();config.setPeerVerifyMode(QSslSocket::VerifyNone);config.setProtocol(QSsl::TlsV1SslV3);NetworkRequest.setSslConfiguration(config);
}
//QImage转base64编码字符串
QString BaiduFaceOnline::image2base64_str(const QImage& img)
{QByteArray data;QBuffer buf(&data);img.save(&buf, "jpg");QString b64str = QString(data.toBase64());buf.close();return b64str;
}
//base64编码字符串转QImage
QImage BaiduFaceOnline::base64_str2image(const QString & base64_str)
{QImage image;QByteArray base64_data = base64_str.toLatin1();image.loadFromData(QByteArray::fromBase64(base64_data));return image;
}
void BaiduFaceOnline::writeAccToken(const QString& token)
{QFile f("AccToken.txt");if(!f.open(QIODevice::WriteOnly | QIODevice::Text)){qDebug() << ("打开文件失败");}QTextStream txtOutput(&f);txtOutput << token;f.close();}
QString BaiduFaceOnline::readAccToken()
{QFile f("AccToken.txt");if(!f.open(QIODevice::ReadOnly | QIODevice::Text)){qDebug() << ("打开文件失败");return "";}QTextStream txtInput(&f);QString lineStr;lineStr = txtInput.readLine();f.close();return lineStr;
}//获取token
void BaiduFaceOnline::getAccToken()
{//鉴权认证参考：http://ai.baidu.com/ai-doc/REFERENCE/Ck3dwjhhuif(AccToken.isEmpty()) {QStringList parlist;parlist.append(QString("grant_type=%1").arg("client_credentials"));parlist.append(QString("client_id=%1").arg(API_Key));parlist.append(QString("client_secret=%1").arg(Secret_Key));QByteArray parameters = parlist.join("&").toUtf8();QUrl url("https://aip.baidubce.com/oauth/2.0/token");NetRequest.setUrl(url);NetRequest.setHeader(QNetworkRequest::ContentTypeHeader, QVariant("text/plain"));connect(NetAccManager,&QNetworkAccessManager::finished,this,&BaiduFaceOnline::getAccTokenReply);NetAccManager->post(NetRequest,parameters);}
}
//获取token槽
void BaiduFaceOnline::getAccTokenReply(QNetworkReply* reply)
{QString error = reply->errorString();if (!error.isEmpty() && error != "Unknown error") {return;}if (reply->error() != QNetworkReply::NoError) {QMessageBox::warning(0,"","请求错误！");return;}else {QByteArray content = reply->readAll();reply->deleteLater();QJsonParseError jsonError;QJsonDocument doucment = QJsonDocument::fromJson(content, &jsonError);  // 转化为 JSON 文档if (!doucment.isNull() && (jsonError.error == QJsonParseError::NoError)){  // 解析未发生错误if (doucment.isObject()){ // 文档只有一个json对象QJsonObject object = doucment.object();  // 转化为对象if (object.contains("access_token")){  // 包含指定的 keyQJsonValue value = object.value("access_token");  // 获取指定 key 对应的 valueif (value.isString()){  // 判断 value 是否为字符串AccToken =  value.toString();  // 将 value 转化为字符串qDebug()<< "parse AccToken:"<<AccToken;writeAccToken(AccToken);    //写入txt文件}}}}}disconnect(NetAccManager,&QNetworkAccessManager::finished,this,&BaiduFaceOnline::getAccTokenReply);
}//人脸对比
double BaiduFaceOnline::FaceMatch(const QImage& image1, const QImage& image2)
{qDebug() <<image1;qDebug() <<image2;QString img1_base64 = image2base64_str(image1);QString img2_base64 = image2base64_str(image2);QJsonObject post_data1;post_data1.insert("image", img1_base64);post_data1.insert("image_type", "BASE64");QJsonObject post_data2;post_data2.insert("image", img2_base64);post_data2.insert("image_type", "BASE64");QJsonArray img_array;img_array.append(post_data1);img_array.append(post_data2);QJsonDocument document;document.setArray(img_array);QByteArray post_param = document.toJson(QJsonDocument::Indented);qDebug() <<post_param;QUrl url(FaceMatchUrl + "?access_token=" + AccToken);NetRequest.setUrl(url);NetRequest.setHeader(QNetworkRequest::ContentTypeHeader, QVariant("application/json"));QNetworkReply * reply = NetAccManager->post(NetRequest, post_param);QEventLoop eventLoop;connect(reply, &QNetworkReply::finished, &eventLoop, &QEventLoop::quit);eventLoop.exec(QEventLoop::ExcludeUserInputEvents);double score = getFaceMatchReply(reply);qDebug() <<"score:" << score;return  score;
}double BaiduFaceOnline::getFaceMatchReply(QNetworkReply* reply)
{double  score = 0;qDebug() <<"reply";QString error = reply->errorString();if (!error.isEmpty() && error != "Unknown error"){return score;}if (reply->error() != QNetworkReply::NoError){qDebug() <<"请求错误！";return score;}else{QByteArray content = reply->readAll();QJsonParseError jsonError;QJsonDocument doucment = QJsonDocument::fromJson(content, &jsonError);  // 转化为 JSON 文档if (!doucment.isNull() && (jsonError.error == QJsonParseError::NoError)){if (doucment.isObject()){QJsonObject root_object = doucment.object();if (root_object.take("error_code").toInt() == 0 && root_object.take("error_msg").toString() == "SUCCESS"){QJsonObject result_object = root_object.take("result").toObject();score = result_object.take("score").toDouble(); /*相似度： */}}}reply->deleteLater();}return score;
}

2.2 人脸搜索并找出最相似的

该任务比较耗时，放入线程中执行，采用moveToThread的方式

    // 调用 moveToThread 将该任务交给 workThreadauto *searchWorker = new SearchWorker ;searchWorker->moveToThread(&workerThread);// operate 信号发射后启动线程工作connect(this, SIGNAL(operate()), searchWorker, SLOT(doWork()));// 该线程结束时销毁connect(&workerThread, &QThread::finished, searchWorker, &QObject::deleteLater);// 线程结束后发送信号，对结果进行处理connect(searchWorker, &SearchWorker::resultReady, this, &CameraWidget::slot_handleResults);// 启动线程workerThread.start();

seachWorker封装

#ifndef SEARCHWORKER_H
#define SEARCHWORKER_H#include <QObject>class BaiduFaceOnline;
class SearchWorker: public QObject
{Q_OBJECT
public:explicit SearchWorker(QObject *parent = nullptr);public slots:void doWork();signals:/*** @brief resultReady 线程完成工作时发送的信号* @param score  相似度* @param name   图片名称*/void resultReady(double score, const QString &name);private:BaiduFaceOnline *m_baiduFace;
};#endif // SEARCHWORKER_H

#include "baidufaceonline.h"
#include "searchworker.h"
#include <QDir>SearchWorker::SearchWorker(QObject *parent):QObject(parent)
{m_baiduFace = new BaiduFaceOnline(this);
}void SearchWorker::doWork()
{/* 读取文件 */QString path = "./faces";QDir dir(path);if (!dir.exists()) {return;}// 设置过滤器dir.setFilter(QDir::Files | QDir::NoSymLinks);QStringList filters;filters << "*.jpg";dir.setNameFilters(filters);QStringList imgList = dir.entryList();if (imgList.count() <= 0) {return;}// 创建单元项double maxScore = 0;   /* 最大分数 */QString maxScoreName;for (int i = 0; i<imgList.count(); ++i) {QImage face1 = QImage("./m.jpg");QImage face2 = QImage(path + "/" + imgList.at(i));qDebug() <<face1.isNull() <<face2.isNull();double score = m_baiduFace->FaceMatch(face1, face2);if(score>=maxScore){maxScore = score;maxScoreName = imgList.at(i);}}qDebug() <<"end";qDebug() <<maxScoreName;emit resultReady(maxScore, maxScoreName);
}

2.3摄像头采集

可以查看我另一篇文章，使用qt自带封装的摄像头类QCamera、QCameraInfo、QCameraViewfinder、QCameraImageCapture

【QT】qt操作摄像头_Jason~shen的博客-CSDN博客_qt调用摄像头先上效果图左上角显示摄像头下拉选项，右上角分别是打开摄像头、关闭摄像头、截图保存的功能，左下显示摄像头内容，右下显示截图图片如何实现？1、在工程文件中添加，QT += multimedia（多媒体），QT += multimediawidgets2、主要用到的部件3、获取摄像头信息 //读取所有摄像头信息 QList<QCameraI...https://blog.csdn.net/qq_40602000/article/details/98875026