3 ms·
I expect image detection in a video stream is pretty advanced these days but I'd imagine you'd need to rotate the image being recorded 3D space to match the pla
by callumprentice 9y ago
I expect image detection in a video stream is pretty advanced these days but I'd imagine you'd need to rotate the image being recorded 3D space to match the plane of the window so you can compare them both? If you know the position of the drone relative to the window, that's doable. Maybe the algorithms are clever enough to account for that these days.
Interesting article - thanks for sharing.
- m4x 9y agoTheir technique doesn't actually do any image analysis at all, since the video stream from the drone is encrypted and they can't view it. Rather, they monitor the bitrate of the video stream and exploit the fact that static/unchanging scenes compress well and have a low bitrate while scenes which are changing have a higher bitrate. They then deliberately change the scene (by blacking out a window) and see whether the bitrate of the video stream increases. If there's a strong correlation between blacking out the window and changes in bitrate, they can conclude the drone is observing their window.
- callumprentice 9y agoGot it - thank you.