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I want to trigger an image capture every time a tyre of a set of moving vehicles appears just in front of the picamera. Is there any way to get this done automatically every time a tyre appears in front of the camera ?

  • There's like a zillion possibility to do that, you need to ask a more specific question. Do you want to recognize tire ? If so you can train a model to recognize just that. Is the camera fixed on something and the background picture remain the same ? Then you should probably try to detect edges and movement. .... – YCN- Jul 5 at 8:40
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Example from here :

import picamera
import picamera.array
import numpy as np

class MyMotionDetector(picamera.array.PiMotionAnalysis):
    def analyse(self, a):
        a = np.sqrt(
            np.square(a['x'].astype(np.float)) +
            np.square(a['y'].astype(np.float))
            ).clip(0, 255).astype(np.uint8)
        # If there're more than 10 vectors with a magnitude greater
        # than 60, then say we've detected motion
        if (a > 60).sum() > 10:
            print('Motion detected!')

with picamera.PiCamera() as camera:
    camera.resolution = (640, 480)
    camera.framerate = 30
    camera.start_recording(
        '/dev/null', format='h264',
        motion_output=MyMotionDetector(camera)
        )
    camera.wait_recording(30)
    camera.stop_recording()

New in version 1.5.

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