Accuracy Improvement of Touch-Screen by Projector and Camera

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  • KASHIMA Takahiro
    Graduate School of Science and Technology for Future Life, Tokyo Denki University
  • NAKAJIMA Katsuto
    Graduate School of Science and Technology for Future Life, Tokyo Denki University

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Other Title
  • プロジェクタとカメラによるタッチスクリーンのタッチ精度向上
  • プロジェクタ ト カメラ ニ ヨル タッチスクリーン ノ タッチ セイド コウジョウ

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Abstract

Applications with projector(s) and camera(s) will be more popular since both devices became inexpensive. We proposed a touch-screen system combined with a projector and a camera. Our system recognizes a hand and its shadow in a projected button area, and determines whether the user is touching the button by calculating the ratio of the hand and its shadow area. It’s essential to accurately recognize their areas on the video images from the camera input. In this paper, we propose a method to accurately separate the hand area and its shadow to pick up their pixel values in the system initialization. According to the color distribution of hand and its shadow in the initialization, likelihood of hand and shadow for the pixels in the button area are determined. By using the ratio of the amount of shadow likelihood and hand likelihood of those pixels, we can achieve stable touch detection and button drag.

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