Birbla

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Hacker News

`motion` is in the big hall of fame for 'software other things are based on' next to imagemagick and curl.

by serf

How does this handle motion detection? Anyone tried it?

I have a bunch of Nest cameras and some cheaper Tapo cameras.

The "motion detection" is night and day different. The Tapo does some basic frame-diffing and it's awful. Shadows? DING DING DiNG MOTION DETECTED! gust of wind made some blades of grass move? Motion! Spider? Motion motion motion! Turn down the sensitivity a notch or two and it won't notice a human walk across the frame 2 meters away. The Tapo ones claim to be smart but twigs and leaves still trigger pet/person/motion alerts. It makes them essentially useless.

The Nest cameras are so much better and their "human" detected is usually zero-false-negatives at the cost of one or two false-positives perhaps once every 3 or 4 months, and their app is superior (tapo one frequently needs to be false-killed to load clips). Yes I am aware that the nest ones are streaming back to google 24/7.

Tldr: naive frame-diffing sucks for this sort of thing if used outside. An open source implementation that has accurate and reliable "human detection" would be amazing. Doesn't need to be "AI" - I would hope that there is some sort of computationally reasonable OpenCV way of doing person detection. Perhaps wait for frame-diffing to flag motion then feed it to a more expensive algorithm?

by mattlondon

What is the difference between this and Frigate? Before clicking the link, I thought this would be a hardware solution (build you own camera from open components).

by drnick1

I always wonder why author of such software will not add some screenshot or gif showing UI and how it does work? In features there is mention of web interface.

by npodbielski

My question about this project and the numerous similar projects: where do I get a usb camera suitable for this? Webcams typically have unsuitable enclosures, focus behavior, and low light performance.

by kube-system

    V4L2 (MJPG) -> cap.read() -> CLAHE(night) -> imencode -> _current_frame (web MJPEG)
                              -> resize .25 -> gray -> blur -> absdiff -> contours -> motion?
                              -> motion? VideoWriter.write() : pre_buffer.append(jpeg)
                              -> on stop: ffmpeg remux fps fix -> Telegram/email
a mjpeg system basically, all in python but does need opencv

by synergy20

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  • Hacker News
  • `motion` is in the big hall of fame for 'software other things are based on' next to imagemagick and curl.
    by serf
  • How does this handle motion detection? Anyone tried it?

    I have a bunch of Nest cameras and some cheaper Tapo cameras.

    The "motion detection" is night and day different. The Tapo does some basic frame-diffing and it's awful. Shadows? DING DING DiNG MOTION DETECTED! gust of wind made some blades of grass move? Motion! Spider? Motion motion motion! Turn down the sensitivity a notch or two and it won't notice a human walk across the frame 2 meters away. The Tapo ones claim to be smart but twigs and leaves still trigger pet/person/motion alerts. It makes them essentially useless.

    The Nest cameras are so much better and their "human" detected is usually zero-false-negatives at the cost of one or two false-positives perhaps once every 3 or 4 months, and their app is superior (tapo one frequently needs to be false-killed to load clips). Yes I am aware that the nest ones are streaming back to google 24/7.

    Tldr: naive frame-diffing sucks for this sort of thing if used outside. An open source implementation that has accurate and reliable "human detection" would be amazing. Doesn't need to be "AI" - I would hope that there is some sort of computationally reasonable OpenCV way of doing person detection. Perhaps wait for frame-diffing to flag motion then feed it to a more expensive algorithm?

    by mattlondon
  • What is the difference between this and Frigate? Before clicking the link, I thought this would be a hardware solution (build you own camera from open components).
    by drnick1
  • I always wonder why author of such software will not add some screenshot or gif showing UI and how it does work? In features there is mention of web interface.
    by npodbielski
  • My question about this project and the numerous similar projects: where do I get a usb camera suitable for this? Webcams typically have unsuitable enclosures, focus behavior, and low light performance.
    by kube-system

  •     V4L2 (MJPG) -> cap.read() -> CLAHE(night) -> imencode -> _current_frame (web MJPEG)
                              -> resize .25 -> gray -> blur -> absdiff -> contours -> motion?
                              -> motion? VideoWriter.write() : pre_buffer.append(jpeg)
                              -> on stop: ffmpeg remux fps fix -> Telegram/email
    a mjpeg system basically, all in python but does need opencv
    by synergy20
  • What are the difference with systems like Motion (https://motion-project.github.io/4.0/motion_guide.html) ?
    by lormayna