Iot_devices.nvr Alternatives

iot_devices.nvr reviews and mentions

• Frigate: Open-source network video recorder with real-time AI object detection
  7 projects | news.ycombinator.com | 18 Nov 2023

  I found motion detection to be the easy part when building my NVR. I just used trial and error and scipy filters and eventually found something I'm happy with.

  Handwriting a GST pipeline is pretty much what I did. I start with frame differences(I only decode the keyframes that happen every few seconds, so motion detection has to work in a single frame to have good response time).

  Then I do a greyscale erosion to suppress small bits of noise and prioritize connected regions.

  After that I take the average value of all pixels, and I subtract it, to suppress the noise floor, and also possibly some global uniform illumination changes.

  Then I square every pixel, to further suppress large low intensity background noise stuff, and take the average of those squares.

  NVR device code(In theory this can be imported and run from a few like python script), but it needs some cleanup and I've never tried it outside the web server.

  https://github.com/EternityForest/iot_devices.nvr/blob/main/...

  GST wrapper utilities it uses, motion detection algorithms at top:

  https://github.com/EternityForest/scullery/blob/master/scull...

  My CPU object detection is OK, but the public, fast, easy to run models and my limited understanding of them is the weak point. I wound up doing a bunch of sanity check post filters and I'm sure it could be done much better with better models and better pre/post filtering.