Kivy Camera As Kv Language Widget
I am using Kivy with a webcam. I have followed this example by @Arnav of using opencv to form and display the camera as a widget. I have 'extended' the layout within python it to a
Solution 1:
Perhaps this example may help you.
# Import 'kivy.core.text' must be called in entry point script# before import of cv2 to initialize Kivy's text provider.# This fixes crash on app exit.import kivy.core.text
import cv2
from kivy.app import App
from kivy.base import EventLoop
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
classKivyCamera(Image):
def__init__(self, **kwargs):
super(KivyCamera, self).__init__(**kwargs)
self.capture = Nonedefstart(self, capture, fps=30):
self.capture = capture
Clock.schedule_interval(self.update, 1.0 / fps)
defstop(self):
Clock.unschedule_interval(self.update)
self.capture = Nonedefupdate(self, dt):
return_value, frame = self.capture.read()
if return_value:
texture = self.texture
w, h = frame.shape[1], frame.shape[0]
ifnot texture or texture.width != w or texture.height != h:
self.texture = texture = Texture.create(size=(w, h))
texture.flip_vertical()
texture.blit_buffer(frame.tobytes(), colorfmt='bgr')
self.canvas.ask_update()
capture = NoneclassQrtestHome(BoxLayout):
definit_qrtest(self):
passdefdostart(self, *largs):
global capture
capture = cv2.VideoCapture(0)
self.ids.qrcam.start(capture)
defdoexit(self):
global capture
if capture != None:
capture.release()
capture = None
EventLoop.close()
classqrtestApp(App):
defbuild(self):
Window.clearcolor = (.4,.4,.4,1)
Window.size = (400, 300)
homeWin = QrtestHome()
homeWin.init_qrtest()
return homeWin
defon_stop(self):
global capture
if capture:
capture.release()
capture = None
qrtestApp().run()
and the kv file:
<QrtestHome>:BoxLayout:orientation:"vertical"Label:height:20size_hint_y:Nonetext:'Testing the camera'KivyCamera:id:qrcamBoxLayout:orientation:"horizontal"height:20size_hint_y:NoneButton:id:butt_startsize_hint:0.5,1text:"start"on_press:root.dostart()Button:id:butt_exittext:"quit"size_hint:0.5,1on_press:root.doexit()
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