pyqt5对话框self.close（）不要停止

Question

我是Python和Pyqt的新手。 我有一个带有MainWindow的应用程序和一个对话框（设置窗口）。在对话框类（加载UIC.loadui）中，我有一个段循环来进行一些OPENCV图像检测。当我调用对话框关闭时，请循环仍在运行。我该如何停止它？ 谢谢 这是代码提取物，全部都在一个文件中：

class UI(QMainWindow):

    def __init__(self):
        super(UI, self).__init__()
        
        #xxxxxx MORE CODE xxxxx
        uic.loadUi("BTS.ui", self)
        self.action_Open_Settings.triggered.connect(lambda: self.open_settings_window('BAS'))
        self.show()
        
    def open_settings_window(self, target):
    # Open Settings Window
    s_window = SettingsWindow(target)
    s_window.exec()
    

class SettingsWindow(QDialog):

    def __init__(self, target):
        super(SettingsWindow,self).__init__()
        uic.loadUi('set.ui', self)
        # Settings Windows named SettingsWindow
        self.setWindowTitle(target)

        # Load Settings
        if target == 'BAS':
            self.H_MIN = B_H_MIN
            self.H_MAX = B_H_MAX
            self.S_MIN = B_S_MIN
            self.S_MAX = B_S_MAX
            self.Area_Value_Text.setEnabled(False)
            self.Peri_Value_Text.setEnabled(False)

        else:  
            self.H_MIN = R_H_MIN
            self.H_MAX = R_H_MAX
            

        self.show()
        self.run(target)

    def run(self, target):
        global gtarget
        global CROP_SIZE

        ref_image = "./set_ref.jpg"
        img = cv2.imread(ref_image)

        while True:
            print('running')

            frame = cv2.resize(img, (1280, 720))

            h_min = self.horizontalSlider_Hue_Min.value()
            h_max = self.horizontalSlider_Hue_Max.value()

            #********MORE CODE*************

            if cv2.waitKey(1) & 0xFF == ord('q'):
                SettingsWindow.close
                break


    def closeEvent(self, event):
        self.close()
        
if __name__ == "__main__":
    app = QApplication(sys.argv)
    UIWindow = UI()
    app.exec_()