Ну, я не добавил функцию выхода, однако кажется, что она работает при переходе на другие экраны и обратно без сбоев.Я поместил fps и часть захвата прямо в класс KivyCamera.
import kivy.core.text
from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput
from kivy.uix.scrollview import ScrollView
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.base import runTouchApp
from kivy.clock import Clock
from kivy.uix.image import Image
import time
import cv2
from kivy.uix.boxlayout import BoxLayout
from kivy.graphics.texture import Texture
class KivyCamera(Image):
def __init__(self, **kwargs):
super(KivyCamera, self).__init__(**kwargs)
self.capture = cv2.VideoCapture(0)
self.fps = 30
Clock.schedule_interval(self.update, 1.0 / self.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
self.canvas.ask_update()
class MainScreen(Screen):
pass
class OptionsScreen(Screen):
pass
class AlarmScreen(Screen):
pass
class Project_1App(App):
def build(self):
screenManager = ScreenManager()
screenManager.add_widget(MainScreen(name="main"))
screenManager.add_widget(OptionsScreen(name="options"))
screenManager.add_widget(AlarmScreen(name="alarm"))
return screenManager
Project_1App().run()
и бит kivy:
<MainScreen>:
BoxLayout:
orientation: "vertical"
KivyCamera:
Label:
height: 20
size_hint_y: None
text: 'Cam_01'
BoxLayout:
orientation: "horizontal"
height: 50
size_hint_y: None
Button:
text: "Options"
size_hint_y: None
width: 150
height: 50
on_release: root.manager.current = 'options'
<OptionsScreen>
GridLayout:
rows:3
cols:1
padding: 10
spacing: 10
Button:
text: "Main Screen"
size_hint_y: None
width: 150
height: 50
on_release: root.manager.current = 'main'
Button:
text: "Alarm"
size_hint_y: None
width: 150
height: 50
on_release: root.manager.current = 'alarm'
Button:
text: "test"
size_hint_y: None
width: 150
height: 50
<AlarmScreen>
GridLayout:
rows:3
cols:1
padding: 10
spacing: 10
Button:
text: "Main Screen"
size_hint_y: None
width: 150
height: 50
on_release: root.manager.current = 'main'
Button:
text: "Options"
size_hint_y: None
width: 150
height: 50
on_release: root.manager.current = 'options'
Button:
text: "test"
size_hint_y: None
width: 150
height: 50