Blog post: https://matthew-bird.com/blogs/Motion%20Detection.html
Current systems for motion activated cameras cost quite a large sum, and thus I thought it would be an interesting project to see how cheap I can get a motion activated camera to be using an ESP32 microcontroller connected to a camera communicating to a central hub. Although I never got around to testing with an ESP32, the code still worked on videos I tested from online.
Similar to my volleyball project here, I take the median of the past n frames to create an estimate of what the background should look like with no moving object in it. Then, I take the difference between the current image and the background, and if the proportion of pixels with a difference above a threshold is above a threshold, motion is detected and a video is saved.
To make the script capable of running in real time with multiple cameras, I also chose to resize the image to 192 x 108 for the median calculations, as that was originally accounting for 95% of the total processing time.
The script saves all the scenes of the input video where movement is detected as a series of videos in an output directory.
Input
Median
Movement mask
- Upload .mp4 files to the In directory
- Run example.ipynb