如何调度kivy摄像头连续读取纹理？

from kivy.app import App
from kivy.uix.camera import Camera
from kivy.uix.image import Image
from kivy.clock import Clock

class MyApp(App):
    def build(self):
        camera = Camera(resolution=(640, 480), play=True)
        image = Image()

        # 调度读取纹理的函数
        Clock.schedule_interval(lambda dt: self.update_texture(camera, image), 1.0 / 30.0)

        return image

    def update_texture(self, camera, image):
        # 从摄像头读取纹理
        camera_texture = camera.texture

        # 将纹理赋值给Image对象
        image.texture = camera_texture

if __name__ == '__main__':
    MyApp().run()