Analysis of Birefringent Materials to Create Static Polarized Color Patterns for Visible Light Indoor Positioning

Visible Light Positioning (VLP) is an emerging field of research with several possible application. While most state-of-the-art VLP systems work with active modulation of light (switching lights on/off rapidly), this poses issues such as the flickering problem and excessive power consumption. In contrast, passive modulation of light (twisting...

System Design of LED-to-Rolling-Shutter-Camera Communication using Color Shift Keying

Visible Light Communication (VLC) is becoming an important research area where Visible Light Sources such as LED, Halogen Lamps and even the sun can be used for Wireless Communication. LED-to-Camera Communication is a form of VLC, where the camera can notice intermittent stimuli changes above a certain threshold frequency (flicker fusion...

JAB: A generic architecture for power efficient, high throughput mobile VLC applications

Visible Light Communication is a method of wireless communication that avoids the oversaturated frequencies used by radio communication. Prior research typically uses the camera on smartphone for communication, but using a camera is energy-intensive and inefficient. Some alternatives are photodiodes and ambient light sensors, however the former...

They could live - encoding invisible information in displays and ways to extract it

In the recent years, several papers have implemented methods which seamlessly integrate data streams into high frame rate monitors without affecting casual viewer experience. This paper proposes an improvement to existing systems which can in theory increase the data throughput of the data stream several times. Exploiting the same...

Blinking LEDs, a potential solution to improve Augmented Reality interactability

Augmented Reality has the potential to expand our interaction with our surrounding environment. A potential solution to improve this interactability is Visible Light Communication through blinking Light Emitting Diodes (LEDs). Data is encoded and then transmitted by blinking the LED, a smart-phone camera is then pointed at the LED to decode the...

ChromaCam: Demodulating Colored Light with a High-End Smartphone

Visible Light Communication (VLC) has seen drastic improvements in recent years, one approach uses active light sources like LEDs, switching them at hight speeds to send data. Another approach uses the fundamental characteristics of liquid crystals (birefringence and thickness) to transmit data to a single pixel receiver. These characteristics...

Designing an optical link between a micro-display and a smartphone camera

The popularity of various wireless communication applications is crowding the radio spectrum. As an alternative medium, the visible light spectrum is be- ing exploited. Camera-based visible light communication systems are gaining much attention due to the widespread use of smartphones equipped with small embedded cameras. Screens (e.g., liquid...