Dynamic Tags: Real time data transfer using inexpensive tags
Dynamic tags are an extension to the concept of Barcodes and QR codes. They are inexpensive tags which transmit realtime information to camera enabled devices. This data is communicated to the camera through the use of a series of LED’s placed on the tag.
Here is a video of the concept in action. Here I have just used an LED on a development board to transmit the temperature information from a register on board to the camera. It is a little jittery but works. (please bear with the demo version of the screen capture software I have used)
When augmented reality experiences and devices become more prevalent , there would be necessity to transfer information from the environment to the user. Instead of using serate communication channels to transmit this data, the same camera vision can be used to communicate with devices in the environment. Dynamic Tags attempts to fill the space of such a device.
Design and Hardware
The tag consists of a low power processor (Attiny13), three LED’s and an IR receiver for the synchronization signal. The micro-controller acquires the data from sensors connected to it (such as temperature, heart rate, voltage etc) . This is then parsed into bits in sets of three (one for each led).
Whenever the sync signal is received it pushes the bits to the three LED’s which are read by the camera. The software on the camera’s end then joins these bits of information to get the original data. The sync signal can be anything from a low power IR signal to the flash of a cellphone camera. It ensures the successful transmission of data. The display then overlays this information over the tag that has transmitted it allowing the use of multiple tags in the same field of vision.
They can be used to transmit information to any camera with little modification such as cellphone cameras, surveillance cameras etc. Combined with augmented reality hardware such as vision overlay goggles, they can be deployed in professional environments such as hospitals where wristbands with these tags can transmit data about heart rate, temperature, blood pressure etc. They could also be used to monitor statistics of machinery such as IC engines and industrial equipment , where these tags give localized information about the various components of the system.
The limiting factor still is the frame rate of the camera. Better encoding can be implemented to facilitate more data transfer per frame. The range of identification needs to be improved. The tags can be made self sufficient if they are appended with solar cells to harvest energy from the environment.
Inter-Glow – Takuji Narumi, Atsushi Hiyama, Tomohiro Tanikawa, Michitaka Hirose , The University of Tokyo.
Prakash: lighting aware motion capture using photosensing markers and multiplexed illuminators – Ramesh Raskar MERL, Cambridge, MA ; Hideaki Nii, University of tokyo ; Bert deDecker Universiteit Hasselt, Belgium
Visible Light Communication with LED Traffic Lights Using 2-Dimensional Image Sensor- Haswani Binti Che Wook, Shinichiro Haruyama, Masao Nakagawa , Keio University, Yokohoma, Japan.