Stacks on the Surface: Resolving Physical Order Using Fiducial Markers With Structured Transparency
Date of Original Version
Proceedings of the ACM international Conference on interactive Tabletops and Surfaces (Banff, Alberta, Canada, November 23 - 25, 2009). ITS '09. ACM, New York, NY, 57-60
Abstract or Description
We present a method for identifying the order of stacked items on interactive surfaces. This is achieved using conventional, passive fiducial markers, which in addition to reflective regions, also incorporate structured areas of transparency. This allows particular orderings to appear as unique marker patterns. We discuss how such markers are encoded and fabricated, and include relevant mathematics. To motivate our approach, we comment on various scenarios where stacking could be especially useful. We conclude with details from our proof-of-concept implementation, built on Microsoft Surface.