Touch detection method for non-display surface using multiple shadows of finger
Takashi Matsubara, Naoki Mori, Takehiro Niikura, Shun’ichi Tano · 2017
Our objective is to create a system that enables users to interact with surrounding surfaces by using touch interactions. In this work, we propose a touch detection method that utilizes the shadows of a finger for use with a system featuring an infrared (IR) camera and two IR lights. Since the shape of a finger's shadow varies depending on the distance between the surface and the finger, the system can recognize a touch by detecting this phenomenon. Evaluations showed that a touch can be detected with high accuracy over an entire large (80 inches wide) operating surface.