~/talk

AIRCODE: Hidden Screen-Camera Communication on an Invisible and Inaudible Dual Channel

on YouTube 11m
Talkat NSDI ’21 · 2021-04-12..04-14· [computer-vision, security]

speakers

name:Kun Qian
links:none on file
name:Yumeng Lu
links:none on file
name:Zheng Yang
links:none on file
name:Kai Zhang
links:none on file
name:Kehong Huang
links:none on file
name:Xinjun Cai
links:none on file
name:Chenshu Wu
links:none on file
name:Yunhao Liu
links:none on file

resources

video:https://youtu.be/parGX_8ey9Q
slides:none on file

summary

AIRCODE achieves imperceptible screen-camera transmission at about 1 Mbps with reported BER ≈ 5% by splitting payload and metadata: video frames carry high-rate data while inaudible audio (preambles at 20–22 kHz, data at 17–19 kHz, 67 ms packets, Manchester coding) carries robust metadata. It uses visual odometry to initialize and track screen corners, merging rule-based candidates and keyframe optimization, yielding correct screen detection in >97% of frames and tracking errors within ~9 pixels on commercial monitors and phones.

AI-written summary · about

chapters (7)

  1. 0:00AIRCODE project
  2. 1:00Hidden screen-camera motivation
  3. 2:06ChromaCode limitations
  4. 3:53AIRCODE system design
  5. 6:20Dual channel metadata via audio
  6. 8:05Performance evaluation
  7. 9:48Conclusion and future

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