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Optical Touch Image Sensing Based on Total Internal Reflection Waveguide Sensor System
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- Authors
- Jeong Dae Suh, Joo-Hang Lee
- Issue Date
- 2013-02
- Citation
- International Conference on Nano-Bio Sensing, Imaging, and Spectroscopy (NBSIS) 2013, pp.1-1
- Language
- English
- Type
- Conference Paper
- Abstract
- In order to demonstrate the optical touch imaging for a multi-touch canvas device we developed optical touch sensing structures that employ total internal reflection wave guide sensors. Recently, optical touch image sensing based on the frustrated total internal reflection (FTIR) have been considered as one of the promising techniques for multi-touch applications such as multi touch screens, military, medical electronics, digital arts, entertainment and human computer interactions in various fields. Several optical touch sensing techniques have been reported for the multi-touch detections [1-3]. Among them, FTIR based touch sensing technique has been considered as a low cost and large scale multi touch sensing devices. In this study, we report the results for optical touch image detection by using FTIR waveguide sensor structures. The optical imaging sensor system incorporates a planar waveguide plate, infrared light emitting diode, high resolution optical camera and computer for image acquisition and processing. Figure 1 shows our optical touch imaging system. The touch sensing plate is made by acrylic transparent layer with size of 50 x 50 mm, an array of 8 x20 infrared light emitting diodes are configured in the edge of the acrylic frame and kept 1.5 cm distance between each. When users touch the waveguide surface, we obtained the optical blobs that are used for optical touch imaging in digital touch device. The obtained touch blob of the object can be seen as bright area on the screen. For the prototype of touch imaging system, the parameters of the total internal reflection were analyzed to optimize the waveguide sensor reactivity. Their performance was also discussed.
- KSP Keywords
- Digital art, Frustrated total internal reflection, High-resolution, Image acquisition and processing, Image sensing, Imaging sensor, Low-cost, Medical electronics, Multi-touch, Optical camera, Optical imaging