PyQt图像处理（将灰度转换为二进制）

Question

我是PyQt的新手。我想建立一个简单的图像处理。我已经将RGB图像变成了灰色，如何将图像变成二进制（使用OpenCV）并显示在标签上？ 我无法在PyQt上实现代码

将图像转换为灰色：

class UIProgram(QMainWindow):
    def __init__(self):
    super(UIProgram,self).__init__()
    loadUi("Backpro2.ui",self)
    #self.image=None
    self.trainLoadImgBtn.clicked.connect(self.loadClicked)
    self.trainPreproBtn.clicked.connect(self.preproClicked)

    self.image = QImage()    
    @pyqtSlot()
    def preproClicked(self):
       gray = cv2.cvtColor(self.image, cv2.IMREAD_COLOR)
       self.image = cv2.cvtColor(gray,cv2.COLOR_BGR2GRAY)

       #(thresh, self.im_bw) = cv2.threshold(self.image, 128, 255, cv2.THRESH_BINARY | cv2.THRESH_OTSU)
       #self.resize_image = cv2.resize(self.im_bw, (180, 180))
       self.displayImage(2)
    def loadImage(self, fname):
       self.image = cv2.imread(fname,cv2.IMREAD_COLOR)
       #self.image2 = cv2.imread(fname, cv2.IMREAD_GRAYSCALE)
       self.displayImage(1)

在Qlabel中显示

def displayImage(self,window=1):
    qformat = QImage.Format_Indexed8
    if len(self.image.shape) == 3:
        if (self.image.shape[2] ) == 4:
            qformat = QImage.Format_RGBA8888
        else:
            qformat = QImage.Format_RGB888
    img = QtGui.QImage(self.image.data,
                       self.image.shape[1],
                       self.image.shape[0],
                       self.image.strides[0],
                       qformat)



    img = img.rgbSwapped()

    if window==1:
        pixmap = QtGui.QPixmap(img)
        pixmap = pixmap.scaled(self.trainOpenImg.width(), self.trainOpenImg.height(), QtCore.Qt.KeepAspectRatio)
        self.trainOpenImg.setPixmap(pixmap)
        self.trainOpenImg.setAlignment(QtCore.Qt.AlignCenter)

    if window==2:
        pixmap = QtGui.QPixmap(img)
        pixmap = pixmap.scaled(self.trainGrayImg.width(), self.trainGrayImg.height(), QtCore.Qt.KeepAspectRatio)
        self.trainGrayImg.setPixmap(pixmap)
        self.trainGrayImg.setAlignment(QtCore.Qt.AlignCenter)

程序设计：