void MainWindow::process()
{
    while (_running)  {
        QDateTime timestamp = QDateTime::currentDateTime();
        try {
            if (!_frame.cols || !_frame.rows) throw e_failure ("MainWindow: Empty frame");
            _temp = _frame.clone();
            _detector->processDownScale(_temp, 2);
            _mutex.lock();
            _mask.clear();
            _mutex.unlock();
            if (_detector->facesFound()) {
                _mask.push_back(QPointF(_detector->rect().x,
                                        _detector->rect().y));
                _mask.push_back(QPointF(_detector->rect().x+_detector->rect().width,
                                        _detector->rect().y+_detector->rect().height));
                _mask.push_back(QPointF(_detector->landmarks()[0].x+_detector->rect().x,
                                        _detector->landmarks()[0].y+_detector->rect().y));
                _mask.push_back(QPointF(_detector->landmarks()[1].x+_detector->rect().x,
                                        _detector->landmarks()[1].y+_detector->rect().y));
                _mask.push_back(QPointF(_detector->landmarks()[4].x+_detector->rect().x,
                                        _detector->landmarks()[4].y+_detector->rect().y));
                _mask.push_back(QPointF(_detector->landmarks()[3].x+_detector->rect().x,
                                        _detector->landmarks()[3].y+_detector->rect().y));
                _mask.push_back(QPointF(_detector->landmarks()[2].x+_detector->rect().x,
                                        _detector->landmarks()[2].y+_detector->rect().y));
            }
            switch (_appState) {
            case AppState::Testing:
                if (!_detector->facesFound()) {
                    setState(FaceState::Noface);
                    throw e_runtime ("MainWindow: No face detected");
                }
                _aligned = _extractor->alignMtcnn(_temp, *_detector);
                if (!_verified) {
                    _pattern = _extractor->extract(_aligned);
                    _etalon->verifySample(_pattern, &_similarity);
                    _verified = _similarity >= 100;
                }
                else if (!_moved) {
                    cv::Rect actual = _extractor->usedFaceRect();
                    if (_faceRect.area() != 0) {
                        cv::Rect is = actual & _faceRect;
                        float isf = (float)is.area() / (float)actual.area();
                        qDebug() << "intersection" << isf;
                        if (isf < 0.75f)
                            _headDetector->reset();
                    }
                    float qual = _extractor->quality();
                    qDebug() << "quality" << qual;
                    if (qual >= _qualThreshold) {
                        if (_progress != 100)
                            setState(FaceState::Spoofing);
                        _moved = _headDetector->addFrame(_extractor->alignedCenter(), _extractor->alignedNose());
                    }
                    else {
                        if (_progress != 100)
                            setState(FaceState::LowQuality);
                        _moved = _headDetector->addEmptyFrame();
                    }
                }
                if (_verified) {
                    if (_moved) {
                        _progress = 100;
                        _verifyTimer.stop();
                        setState(AppState::Ready);
                        setState(FaceState::Accepted);
                        _verificationTime = _timestamp.msecsTo(QDateTime::currentDateTime());
                    }
                }
                _faceRect = _extractor->usedFaceRect();
                break;
            case AppState::Training:
                if (!_detector->facesFound()) {
                    setState(FaceState::Noface);
                    throw e_failure ("MainWindow: No face detected");
                }
                setState(FaceState::None);
                _pattern = _extractor->extractMtcnnAlign(_temp, *_detector);
                if (_etalon->addSample(_pattern)) {
                    _progress += 100/_trainFrames;
                }
                if (_progress >= 100) {
                    saveEtalon();
                }
                break;
            default:;
            }
        } catch (e_default e) {
            qDebug() << e.what();
            _similarity = 0;
        } catch (...) {
            _similarity = 0;
        }
        _frameTime = timestamp.msecsTo(QDateTime::currentDateTime());
    }
}