Research And Implementation Of Multi-point Screen-positioning System Based On Camera Convergence

Interactive electronic device is an advanced teaching and meeting products supporting human-computer interaction. It has big high-definition screen, intuitive on-screen handwriting annotation, easy touch operation, mass rapid image processing, remote multi-party data sharing and user-friendly mode of operation and many other advantages. It has been widely used in meeting rooms, classrooms, demonstration rooms, control rooms of commercial, business, education, scientific research, military, government, and health care, and it provides a comprehensive solution for people's quickly interactive communication and on-site decision-making.Multi-Touch is an important technology in solutions of interactive electronic equipments. It is composed of three important technologies, one is precise-positioning, the second is tracking-recognition, the third is gesture-recognition. The multi-point precise-positioning is the base of multi-touch technology, it plays a very important role in multi-touch system.Currently, there are some technologies can achieve precise-positioning of interactive electronic device, Including the electromagnetic induction, infrared ray, resistive membrane, ultrasonic wave, CCD (Charge-Coupled Device Charge-coupled device) light scanning technology, and so on. Most of the technologies are complexity, high-cost, limited range of applications, and they are difficult to implement.This paper based on a series of theory of optical detection , the knowledge of digital camera and the technology of CCD light-scanning. We use the low-cost CMOS (Complementary Metal Oxide Semiconductor) digital image sensor as the image acquisition device. Based on IDB4665 (Interactive Digital Board) test platform, we achieve the precise positioning system by using the technology of image distortion correction and convergence of camera location, which indicates that a new approach with application value is issued for the realization of people's multi-point positioning system.There are several important and difficult technology in the paper. The construction of architecture of system for multi-point positioning of screen based on camera convergence. The design and implementation of camera positioning, and the selection and implementation of distortion correction algorithm for wide-angle lens, fisheye lens.