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