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Their 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.




Got it - thank you.




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