Dynamic and invisible messaging for visual MIMO

The growing ubiquity of cameras in hand-held devices and the prevalence of electronic displays in signage creates a novel framework for wireless communications. Traditionally, the term MIMO is used for multiple-input multipleoutput where the multiple-input component is a set of radio transmitters and the multiple-output component is a set of radio receivers. We employ the concept of visual MIMO where pixels are transmitters and cameras are receivers. In this manner, the techniques of computer vision can be combined with principles from wireless communications to create an optical line-of-sight communications channel. Two major challenges are addressed: (1) The message for transmission must be embedded in the observed display so that the message is hidden from the observer and the electronic display can simultaneously be used for its originally intended purpose (e.g. signage, advertisements, maps); (2) Photometric and geometric distortions during the imaging process corrupt the informa...

• Type: Journal
• Year: 2012
• Where: WACV
• Authors: Wenjia Yuan, Kristin J. Dana, Ashwin Ashok, Marco Gruteser, Narayan B. Mandayam
• Keywords: Computer Vision, Geometric Distortions, Photographic Message, Radio Transmitters, WACV 2012