Title: Hidden Screen-Camera Communication on an Invisible and Inaudible Dual Channel
Hidden screen-camera communication emerges as a key enabler for the next generation videos that allow side information, such as TV commercials, augmented contents, and even the video itself, to be delivered to machines during normal watching. To guarantee imperceptibility to human eyes, existing solutions have to sacrifice data rate and reliability enormously. This paper presents AirCode, a hidden screen-camera communication system built upon invisible visual and inaudible audio dual channel. While ensuring great unobtrusiveness, AirCode achieves robust communication at a remarkably high rate of $>$1Mbps, for the first time, enabling imperceptible transmission of not only texts but also videos. AirCode makes two key technical contributions. First, AirCode takes the complementary advantages of video and audio channels by exploiting the reliable yet low-rate inaudible audio link as the control channel while the unreliable but high-rate visual link as the data channel. Second, AirCode incorporates visual odometry to accurately identify and track the captured screen, regardless of dynamic video contents and surrounding interference. Experiments on commercial monitors and smartphones demonstrate that AirCode significantly outperforms the state-of-the-art system, yielding a remarkable data rate of 1069 Kbps while with BER of 5%.
杨铮，清华大学软件学院副教授，博士生导师，清华信息科学与技术国家实验室成员。在清华大学计算机系获得工学学士学位，在香港科技大学计算机系获得工学博士学位。研究方向为移动计算与普适计算，包括物联网、传感网、室内定位、无线感知、群智感知、城市计算等。发表论文100余篇，出版中、英文学术专著各1部。获得国家自然科学奖二等奖。入选北京市科技新星、国家青年拔尖人才计划（万人计划），获得国家优秀青年科学基金资助。担任INFOCOM、ICDCS、MobiHoc等国际学术会议程序委员以及IEEE Transactions on Vehicular Technology (IEEE TVT)的编委。