image not getting refreshed in Qlabel

[prkhr4u]

I have done the changes and now am sending the image via signal,but still I am unable to refresh the image.
Here is what I have done:

class GrabThread : public QThread
{
    Q_OBJECT
     private:
      void run();
    public:
    signals:
    void ImageRefreshSignal(const QImage &image);
};

class GrabThread : public QThread
{
    Q_OBJECT
     private:
      void run();
    public:
    signals:
    void ImageRefreshSignal(const QImage &image);
};

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Signal emmited like:

QImage img;
img.load("abc.bmp");
emit ImageRefreshSignal(img);

QImage img;
img.load("abc.bmp");
emit ImageRefreshSignal(img);

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slot method called like:

void Dialog_user::ImageRefreshSlot(QImage img )
{
    qDebug()<<"inside slot";    
    ui->label->setPixmap(QPixmap::fromImage(img));
}

void Dialog_user::ImageRefreshSlot(QImage img )
{
    qDebug()<<"inside slot";    
    ui->label->setPixmap(QPixmap::fromImage(img));
}

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//dialog_user.h

class Dialog_user : public QDialog
{
    Q_OBJECT
 
public:
    explicit Dialog_user(QWidget *parent = 0);
    ~Dialog_user();
 
private slots:
    void ImageRefreshSlot (QImage img);

class Dialog_user : public QDialog
{
    Q_OBJECT
    
public:
    explicit Dialog_user(QWidget *parent = 0);
    ~Dialog_user();
    
private slots:
    void ImageRefreshSlot (QImage img);

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the connection is as follows:

QObject::connect( & gthread, SIGNAL( ImageRefreshSignal(QImage) ),& d_user, SLOT( ImageRefreshSlot(QImage) ) );

QObject::connect( & gthread, SIGNAL( ImageRefreshSignal(QImage) ),& d_user, SLOT( ImageRefreshSlot(QImage) ) );

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I have checked the mechanism, and the message "inside slot" is being printed,but the image is not getting refreshed.