Transforming a Regular Screen Into a Touch Screen Using a Single Webcam

Abstract

Nowadays, touch screens are widely used in many commercial devices. In this paper, we present an inexpensive webcam-based touch screen system based on a simple and generic finger detection technique. Only a single webcam and a regular screen are used to achieve this goal. By using the scene geometry and the camera model, we can determine the position of the finger on the screen. The technique we propose is simple and works well under various surrounding environments while the detecting method suits many finger colors and shapes. Our approach can also be used for realtime applications. Experimental results and practical applications are provided to ascertain the proposed method.

Piezoelectric vs. Capacitive Based Force Sensing in Capacitive Touch Panels

“…Capacitance touch screen panels (TSP) are widely used in displays, as they offer benefits such as multi-touch, high visibility, and non-physical touch recognition [1]. Traditional capacitance TSPs provide 2D (x-y coordinate) touch detection [2], while 3D (z coordinate indicates force level) touch detection has been achieved recently [3].…”

Reduction of Noise Spikes in Touch Screen Systems by Low Pass Spatial Filtering

“…T OUCH based human-machine interactivity has become a ubiquitous technology used in displays [1], [2]. Among different sensing techniques, capacitive touch screen panels (TSPs) are widely used in mobile devices, where high touch accuracy is a fundamental requirement for good user experience.…”

Fast Readout and Low Power Consumption in Capacitive Touch Screen Panel by Downsampling

“…APACITIVE based touch sensing has become an ubiquitous technology in displays [1]. To design a capacitive touch screen panel (TSP), many factors need to be taken into consideration, such as power consumption, readout speed and detection accuracy.…”