kivy and opencv work together demo

kivy_cv.py

# coding:utf-8
from kivy.app import App
from kivy.uix.image import Image
from kivy.clock import Clock
from kivy.graphics.texture import Texture
import cv2


class KivyCamera(Image):
    def __init__(self, capture, fps, **kwargs):
        super(KivyCamera, self).__init__(**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


class CamApp(App):
    def build(self):
        self.capture = cv2.VideoCapture(1)
        self.my_camera = KivyCamera(capture=self.capture, fps=30)
        return self.my_camera

    def on_stop(self):
        #without this, app will not exit even if the window is closed
        self.capture.release()


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

I don't know if anyone is still interested in this, but since it took me three days to get there, here is a "minimal" example of OpenCV VideoCapture displaying frame by frame on Android:

https://github.com/4ndr3aR/kivy-opencv-demo

I don't know if anyone is still interested in this, but since it took me three days to get there, here is a "minimal" example of OpenCV VideoCapture displaying frame by frame on Android:

https://github.com/4ndr3aR/kivy-opencv-demo

Really Great.Helped me a lot

I found this video tutorial about building kivy apps with opencv codes using Buildozer, it worked for me. I've tried using some simple functions of opencv and some other libraries as well and worked like a charm. If you face some errors I recommend using logcat filter to troubleshoot:
https://www.youtube.com/watch?v=c4tuSxSoERY&t=245s
Here is a simple working code using opencv to display the phone's camera image on the screen:
https://stackoverflow.com/questions/61122285/kivy-camera-application-with-opencv-in-android-shows-black-screen

Nope. Trying to figure that out though.

@DunZek have you figured this one out?

Has anyone succeeded in making an Android camera with Python using OpenCv?
Below is the code that succeeded in another way.

-- below --

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
import time

from android.permissions import request_permissions, Permission
request_permissions([Permission.CAMERA])

Builder.load_string('''
:
orientation: 'vertical'
Camera:
id: camera
resolution: (1280, 720)
play: False
ToggleButton:
text: 'Play'
on_press: camera.play = not camera.play
size_hint_y: None
height: '48dp'
Button:
text: 'Capture'
size_hint_y: None
height: '48dp'
on_press: root.capture()
''')

class CameraClick(BoxLayout):
def capture(self):
camera = self.ids['camera']
timestr = time.strftime("%Y%m%d_%H%M%S")
camera.export_to_png("IMG_{}.png".format(timestr))
print("Captured")

class TestCamera(App):
def build(self):
return CameraClick()

TestCamera().run()

I tried running it on a Raspberry Pi and it runs pretty slow. Do you have any optimizations for that?

Threads?

I don't know if anyone is still interested in this, but since it took me three days to get there, here is a "minimal" example of OpenCV VideoCapture displaying frame by frame on Android:

https://github.com/4ndr3aR/kivy-opencv-demo

I couldn't get this to work. The code ran ok but only for one frame after which the Kivy window closed.