pyqt5显示numpy类型图片

代码如下：
    imgName, imgType = QFileDialog.getOpenFileName(None, "打开图片", "", type_image)
   
    img = cv.imread(imgName)
    src = cv.Canny(img,100,200)
    self.label.setPixmap(src)


报错：
TypeError: setPixmap(self, QPixmap): argument 1 has unexpected type 'numpy.ndarray'


求教如何转换类型？？