Journal of Computer Applications ›› 2012, Vol. 32 ›› Issue (12): 3408-3410.DOI: 10.3724/SP.J.1087.2012.03408

• Graphics and image technology • Previous Articles     Next Articles

Anti-shake and coordinate interpolation techniques in machine vision electronic whiteboard system application

ZHOU Zu-wei,LIU Sen,WANG Yi-wen,LI Hui   

  1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China,Chengdu Sichuan 610054,China
  • Received:2012-06-29 Revised:2012-08-16 Online:2012-12-29 Published:2012-12-01
  • Contact: ZHOU Zu-wei

机器视觉电子白板系统的防抖与坐标插值技术

周祖微,刘森,王忆文,李辉   

  1. 电子科技大学 电子薄膜与集成器件国家重点实验室,成都 610054
  • 通讯作者: 周祖微
  • 作者简介:周祖微(1987-),女,湖南永州人,硕士研究生,主要研究方向:数字图像处理、片上系统设计;〓刘森(1986-),男,四川泸州人,硕士研究生,主要研究方向:嵌入式系统;〓王忆文(1966-),男,辽宁沈阳人,教授,博士,主要研究方向:SOC/SOPC的设计与测试、可测性设计;〓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、片上系统设计。
  • 基金资助:
    广东省教育部产学研合作项目;中央高校基本科研业务项目

Abstract: In the electronic whiteboard system based on machine vision, an improved mean filter was proposed to eliminate touching-point jitter. In order to enhance the working fluency without hardware restrictions,a coordinate interpolation based on curve-fitting was adopted to improve the real-time performance of the whole system and smooth the trajectory of moving touching-point. The experimental results show that: on one hand, touching-point jitter can be eliminated. On the other hand, the system can output 180 touching-point coordinates per second when the camera works at its highest speed of 60 frame per second. The real-time performance of the whole system gets effectively improved without any new hardware cost.

Key words: machine vision, human-computer interaction, anti-shake, coordinate interpolation, real-time performance

摘要: 在基于机器视觉的电子白板系统应用中,为了消除各种因素导致的触控点抖动,提出了一种改进的均值滤波的防抖方法。为了突破硬件设备的限制提高系统工作的流畅性,采用了一种基于曲线拟合的坐标插值方法来提高系统实时性并平滑处理触控点的运动轨迹。实验结果表明:触控点的抖动情况得到了消除,在摄像头最高工作频率60fps的情况下,系统能以每秒输出180个触控点坐标的速度实时工作,在不增加硬件成本的情况下提高了系统实时性。

关键词: 机器视觉, 人机交互, 防抖, 坐标插值, 实时性

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