Ma Jianshe

Interactive projection system based on a two-dimensional position sensitive detector

Interactive projection systems based on CCD/CMOS have been greatly developed in recent years for their non-contact sensing type. However, the location accuracy and tracing speed are limited by the resolution and frame rate of the CCD/CMOS. In this paper, we introduced a new type of non-contact interactive projection system based on a two-dimensional position sensitive detector (PSD). By using the PSD, both high positioning accuracy and high tracing speed can be achieved. Experimental results show that the positioning error is about 2mm over a 1200mm×1000mm projection screen, and the sampling rate is at least 200Hz.

An economical large area touch panel utilizing a compact optical configuration and linear optical sensors

An economical large area touch panel was presented. Through a new type of optical path constituted by specially arranged mirrors and other optical devices, the one-dimensional imaging of an object on top of the touch panel surface can be captured by one-dimensional optical sensors such as CCD, CMOS or PSD and its position can be located. Simple optical structure, less component and improved processing speed through the use of one-dimensional optical sensors, makes it suitable to large-space touch panel applications.

A location tracking method based on reflection image detection used in interactive projector-camera system

with the great advantages of interactive projection technology, the new optical-electronic human-computer interactive large screen display system has been paid more and more attention. In this paper, the approach with a new optical structure based on linear detectors has been presented. This system consists of computer, projector, camera and digital pen, and the camera uses two linear detectors to detect the infrared light point, which is reflected by two stripe mirrors separately, so that the location of the light point could be measured. This method has the advantages of anti-obstruct, fast tracking, low-cost, and can be widely used in teaching, training, and so on.