class GUI(QMainWindow, form.Ui_Main_form):
    def __init__(self):
        super(GUI, self).__init__()
        self.setAttribute(Qt.WA_DeleteOnClose)
        self.setupUi(self)
        self.scene = QGraphicsScene()
        self.Graph.setScene(self.scene)
        self.scene.clear()
        self.scene.setSceneRect(0, 0, current_w, current_h)
        self.imgQ = ImageQt.ImageQt(current_image)
        pixMap = QPixmap.fromImage(self.imgQ)
        self.scene.addPixmap(pixMap)
        self.Graph.fitInView(QRectF(0, 0, current_w, current_h)), Qt.KeepAspectRatio
        self.scene.update()

def main():
    app = QApplication(sys.argv)
    window = GUI()
    window.show()
    app.exec_()

if __name__ == '__main__':
    main()