#Coding4Fun – How to control your #drone with 20 lines of code! (9/N)

Coding4Fun Drone 🚁 posts

Hi!

Let’s take some Frames Per Second measurements on the UDP and OpenCV connection. It seems that working with simple movements, the values moves between 30 and 60 FPS.

showing FPS information with the drone camera

Just added a couple of lines in the main While, to calculate the FPS.

# open
i = 0
while True:
    i = i + 1
    start_time = time.time()

    sendReadCommand('battery?')
    print(f'battery: {battery} % - i: {i}')

    try:
        ret, frame = cap.read()
        img = cv2.resize(frame, (640, 480))

        if (time.time() - start_time ) > 0:
            fpsInfo = "FPS: " + str(1.0 / (time.time() - start_time)) # FPS = 1 / time to process loop
            font = cv2.FONT_HERSHEY_DUPLEX
            cv2.putText(img, fpsInfo, (10, 20), font, 0.4, (255, 255, 255), 1)

        cv2.imshow('@elbruno - DJI Tello Camera', img)
    except Exception as e:
        print(f'exc: {e}')
        pass

    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

As a final note, just need to mention that I make some tests using different camera resolutions and the FPS averages are similar. I tested with 640 * 480 pixels and 1024*768 pixels.

Next posts, let’s do some Face Detection and rock some AI with the drone!

Happy coding!

Greetings

El Bruno

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