Design and implementation of multi-touch system using FTIR technique for optimization of finger touch detection

In recent years, multi-touch screens are emerging and seem to be ubiquitous in near future. The intuitive surfaces provide collaborative workspace for users to perform natural style of multi-touch interaction simultaneously. Users can access the interactive elements such as WIMP (window, icon, menus and pointing) using their bare fingers. At the same time multi-touch screens have ambiguity in multiple finger touch detection. Users acquire the accuracy in the fingers touch detection during the selection of interactive elements. In order to optimize the multiple finger touch detection, we propose the system and its architecture using the Frustrated Total Internal Reflection (FTIR) sensing technique. The system surface is improved by superimposing the transparent layers on acrylic surface. In addition, we modify the architecture of multi-touch surface by configuring the infrared light emitting diodes against the clean edges of acrylic surface. In order to test the system we conduct the experiment by involving the subjects and investigate the quality of fingertip blobs. The proposed system may increase the image quality of fingertip blobs which may help in achieving the fidelity for sensing the multiple fingers on interactive surface.