Kivy Camera Class with Grayscale Filter

[ShibaInu]

Hello,

is it possible to use the Kivy camera class and apply a filter on it with opencv? 

like this:

KVString:"""

    

GrayscaleCam:

   

"""

class GrayscaleCam(Camera):

gray = cv.cvtColor( KIVYCAMFRAME , cv.COLOR_BGR2GRAY)

[Elliot Garbus]

Here is an example that used Image to display a filtered OpenCV stream on an image.

 

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

import cv2 as cv


class CamApp(App):

    def build(self):
        self.img1 = Image()
        layout = BoxLayout()
        layout.add_widget(self.img1)
        self.capture = cv.VideoCapture(0)
        Clock.schedule_interval(self.update, 1.0 / 33.0)
        return layout


    def update(self, dt):
        # display image from cam in opencv window
        ret, frame = self.capture.read()
        gray= cv.cvtColor(frame, cv.COLOR_BGR2GRAY)
        # convert it to texture
        adaptive_thresh = cv.adaptiveThreshold(gray, 255, cv.ADAPTIVE_THRESH_MEAN_C, cv.THRESH_BINARY, 11, 3)

        buf = cv.flip(adaptive_thresh, 0).tobytes()
        texture1 = Texture.create(size=(adaptive_thresh.shape[1], adaptive_thresh.shape[0]), colorfmt='luminance')
        texture1.blit_buffer(buf, colorfmt='luminance', bufferfmt='ubyte')#replacing texture
        # display image from the texture
        self.img1.texture = texture1


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

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[ShibaInu]

can you get the camera input without cv.VideoCapture(0)?

 My app cant access the Android cam with this metod. On PC everything is fine, but when build with buildozer => ret is false.


 I gave permission and evrything...  I dont think you can build an App with cv.VideoCapture

[Elliot Garbus]

I have not done any Android development.  You may find this helpful:  https://github.com/Android-for-Python/Android-for-Python-Users#camera

To view this discussion on the web visit https://groups.google.com/d/msgid/kivy-users/e518377e-11f4-4e9f-b157-5f87b3476763n%40googlegroups.com.

 

[Robert]

OpenCV camera on Android after NDK17 is either difficult or impossible, not certain which, I have heard rumors...

Don't even think about backpedaling the NDK version.

Starting from scratch Xcamera is generally the best chance.

I've been working on a opencv image processing example that uses the Android's CameraX, it works great.

I'm absolutely not suggesting trying CameraX, it is major work to figure out how to make it play with Kivy.

Hope to package that up and share by the end of the year, but there is no schedule as it became part of a larger project....

[ShibaInu]

Thats very intresting. Thank you all for your suggestions. 

@Robert could you show one example of CameraX with opencv? 

Ill look forward to get my App work with your guys ideas

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[Robert]

As I said I'm not ready to share at this time.

[ShibaInu]

Okay, still thank you.