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void myQLabel::setNextFrame(unsigned char *bitmap)
{
    memcpy(image, bitmap, size);
    QCoreApplication::postEvent(this, new QEvent(QEvent::Paint));
}
void myQLabel::paintEvent(QPaintEvent *e)
{
    some_image_transformation(image);
    QPixmap pixmap = QPixmap::fromImage( image );
    QPalette palette;
    palette.setBrush(backgroundRole(), QBrush(pixmap));
    setPalette(palette);
}

QCoreApplication::postEvent(this, new QEvent(QEvent::Paint));

void QWidget::update()
{
    if (updatesEnabled() && isVisible()) {
        if (testAttribute(Qt::WA_WState_InPaintEvent)) {
            QApplication::postEvent(this, new QUpdateLaterEvent(rect()));
//...

class ImageProcessor : public QThread
{
public:
    ImageProcessor();
    ~ImageProcessor();
private:
    myQLabel *frame_render;
    void run();
    bool dataReady;
};

void ImageProcessor::run()
{
    while( true ) {
        if(dataReady) {
            frame_render->setNextFrame( image_buffer );
        } else {
            Sleep(3);
        }
    }
}

class MainDialog : public QDialog
{
public:
    MainDialog();
    ~MainDialog();
};

int main(int argc, char *argv[])
{
    QApplication a( argc, argv );
    MainDialog *pDialog = new MainDialog();
    ImageProcessor *pProcessor = new ImageProcessor();
    a.exec();
    return 0; 
} 

void myQLabel::setNextFrame(unsigned char *bitmap)
{
    memcpy(image, bitmap, size);
    QCoreApplication::postEvent(this, new QEvent(QEvent::Paint));
}

QCoreApplication::postEvent(this, new QEvent(QEvent::Paint));

int main(int argc, char *argv[])
{
    QApplication a( argc, argv );
    MainDialog *pDialog = new MainDialog();
    ImageProcessor *pProcessor = new ImageProcessor();
    a.exec();
    return 0; 
}