计算机应用 ›› 2014, Vol. 34 ›› Issue (1): 139-141.DOI: 10.11772/j.issn.1001-9081.2014.01.0139

• 虚拟现实与数字媒体 • 上一篇    下一篇

机器视觉电子白板的校准实现技术

徐霄1,王润2,彭国杰1,杨琦1,王忆文1,李辉1   

  1. 1. 电子薄膜与集成器件国家重点实验室(电子科技大学), 成都 610054;
    2. 新乡职业技术学院 电子信息系,新乡 453006
  • 收稿日期:2013-07-22 修回日期:2013-09-13 发布日期:2014-02-14 出版日期:2014-01-01
  • 通讯作者: 徐霄
  • 作者简介:徐霄(1989-),男,山东聊城人,硕士研究生,主要研究方向:SOC设计、嵌入式系统;王润(1972-),女,河南信阳人,高级讲师,硕士,主要研究方向:嵌入式系统、传感器、高频电子;彭国杰(1988-),男,广东江门人,硕士研究生,主要研究方向:SOC设计、嵌入式系统;杨琦(1990-),男,河北唐山人,主要研究方向:嵌入式软件;王忆文(1966-),男,辽宁沈阳人,教授,主要研究方向:SOC/SOPC的设计与测试、DFT;李辉(1974-),男,安徽宁国人,讲师,博士,主要研究方向:音频数字信号处理及其VLSI实现、SOC设计。
  • 基金资助:

    广东省教育部产学研合作项目

Implementation of calibration for machine vision electronic whiteboard

XU Xiao1,WANG Run2,PENG Guojie1,YANG Qi1,WANG Yiwen1,LI Hui1   

  1. 1. State Key Laboratory of Electronic Thin Films and Integrated Devices (University of Electronic Science and Technology of China), Chengdu Sichuan 610054, China;
    2. Department of Electronic Information, Xinxiang Polytechnic College, Xinxiang Henan 453006, China
  • Received:2013-07-22 Revised:2013-09-13 Online:2014-02-14 Published:2014-01-01
  • Contact: XU Xiao

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摘要： 针对基于机器视觉的电子白板屏幕较大、目标识别误差分布不均的特点,选用了一种分块校准方法进行系统校准。在完成了人机交互设备(HID)实现的基础上,进行了上位机软件的开发。建立了上位机与电子白板间的通信,完成了校准点设置、坐标接收和校准系数的计算,实现了电子白板的校准。测试结果表明:经过校准后,在140cm×105cm的大面积白板上,目标识别平均精度可达1.2mm。经过校准后的电子白板样机能精准地完成基本的触控操作。

关键词: 电子白板, 机器视觉, 校准, 映射, 透视投影, 分块

Abstract: A partitioned calibration approach was applied to electronic whiteboard based on machine vision, since its location error distribution on large screens was non-homogeneous. Based on Human Interface Device (HID)'s implementation, the specific computer software was developed and the communication between the computer and electronic whiteboard was established. Configuration of calibration points on the whiteboard, receiving coordinates of these points, and calculation of calibration coefficients were completed. Thus the whole system calibration was implemented. The experimental results indicate that after calibration, the location accuracy is about 1.2mm on average on electronic whiteboard with the size of 140cm×105cm. And basic touch operations are accurately performed on the electronic whiteboard prototype after calibration.

Key words: electronic whiteboard, machine vision, calibration, mapping, perspective projection, partition

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