AttributeError: 'NoneType' object has no attribute 'shape'

[Karthi V2246]

when i use Camera in my Widget , i stuck on thus erroe '' AttributeError: 'NoneType' object has no attribute 'shape''  

any one explain ?

[Elliot Garbus]

It could be a number of things.

1. A missing dependency – Using the Camera on Windows requires the installation of a camera provider, if you are on Windows “pip install OpenCV-python” to install OpenCV as the camera provider.
2. You could be using an ids dict before it was populated.  This can happen if you are accesing ids in the __init__(), instead access the ids dict in on_kv_post() or another method, not __init__()

 

Share some code and a more detailed error message for more help.  Here is a simple camera example:

 

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


kv = '''
CameraClick:
    orientation: 'vertical'
    Camera:
        id: camera
        resolution: (640, 480)
        play: True
    Button:
        text: 'Capture'
        size_hint_y: None
        height: '48dp'
        on_release: root.capture()
'''


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


class TestCamera(App):
    def build(self):
        return Builder.load_string(kv)


TestCamera().run()

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