  Directional information measurement has many applications in domains such as
robotics, virtual and augmented reality, and industrial computer vision.
Conventional methods either require pre-calibration or necessitate controlled
environments. The state-of-the-art MoireTag approach exploits the Moire effect
and QR-design to continuously track the angular shift precisely. However, it is
still not a fully QR code design. To overcome the above challenges, we propose
a novel snapshot method for discrete angular measurement and tracking with
scannable QR-design patterns that are generated by binary structures printed on
both sides of a glass plate. The QR codes, resulting from the parallax effect
due to the geometry alignment between two layers, can be readily measured as
angular information using a phone camera. The simulation results show that the
proposed non-contact object tracking framework is computationally efficient
with high accuracy.
