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基于 arnav 的示例，我正在尝试将此自定义相机小部件添加到 kv 结构中。不幸的是，我仍然不清楚这种“机制”。所以我最终得到了以下代码。单击开始按钮后，凸轮的灯被激活。但是没有显示“视频流”。当仅使用 cv2.VideoCapture(0) 运行 arnav 的代码时，会显示“视频流”。

我在这里做错了什么？

qrtest.py：

from kivy.app import App
from kivy.uix.image import Image
from kivy.clock import Clock
from kivy.graphics.texture import Texture

from kivy.uix.boxlayout import BoxLayout
from kivy.core.window import Window

import cv2
import os


class KivyCamera(Image):
    def dostart(self, capture, fps, **kwargs):
        self.capture = capture
        Clock.schedule_interval(self.update, 1.0 / fps)

    def update(self, dt):
        ret, frame = self.capture.read()
        if ret:
            # convert it to texture
            buf1 = cv2.flip(frame, 0)
            buf = buf1.tostring()
            image_texture = Texture.create(
                size=(frame.shape[1], frame.shape[0]), colorfmt='bgr')
            image_texture.blit_buffer(buf, colorfmt='bgr', bufferfmt='ubyte')
            # display image from the texture
            self.texture = image_texture


capture = None

class QrtestHome(BoxLayout):

    def init_qrtest(self):
        pass

    def dostart(self, *largs):
        global capture
        capture = cv2.VideoCapture(0)
        my_camera = KivyCamera(capture=capture, fps=10, )
        my_camera.dostart(capture,10)

    def doexit(self):
        global capture

        if capture != None:
            capture.release()

        os._exit(0)


class qrtestApp(App):
    def build(self):
        Window.clearcolor = (.4,.4,.4,1)
        Window.size = (400, 300)
        homeWin = QrtestHome()
        homeWin.init_qrtest()
        return homeWin
qrtestApp().run()

和 qrtest.kv 文件：

<QrtestHome>:

    BoxLayout:
        orientation: "vertical"

        Label:
            height: 20
            size_hint_y: None
            text: 'Testing the camera'

        KivyCamera:
            canvas:
                Color:
                    rgb: (0, 0.6, 0.6)

                Rectangle:
                    texture: self.texture
                    pos: (50, 30)
                    size: (300, 240)


            height: 260
            id: qrcam

        BoxLayout:
            orientation: "horizontal"
            height: 20
            size_hint_y: None

            Button:
                id: butt_start
                size_hint: 0.5,1
                text: "start"
                on_press: root.dostart()

            Button:
                id: butt_exit
                text: "quit"
                size_hint: 0.5,1
                on_press: root.doexit()
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