线程上的PyQt WebCam图像

Question

我正在尝试使用PyQt使用以下代码获取实时网络摄像头视图

class LoadImageThread(QtCore.QThread):
  def __init__(self):
    QtCore.QThread.__init__(self)

  def __del__(self):
    self.wait()

  def run(self):
    c = cv2.VideoCapture(0)
    while True:
        return_val, img = c.read()
        w, h =320, 240
        data = img.tostring(("raw", "BGRX"))
        qimage = QtGui.QImage(img, w, h, QtGui.QImage.Format_RGB32)
        qpixmap = QtGui.QPixmap(w,h)
        pix = QtGui.QPixmap.fromImage(qimage)
        #ui.label.setPixmap(pix)
        self.emit(QtCore.SIGNAL('showImage(QPixmap, int, int)'), pix, 320, 240)

#########################################
def showImage(p, w, h):
   ui.label.setPixmap(p)

ui.connect(thread, QtCore.SIGNAL("showImage(QPixmap, int, int)"), showImage)

但我得到了以下错误

QPixmap: It is not safe to use pixmaps outside the GUI thread

任何解决方案？感谢