1、- I - 摘 要 近年来,随着用户对人机交互的友好性和自然性的需求不断增加,兴起了一种新的 人机交互技术多点触摸技术。 多点触摸技术超越了传统人机交互技术中使用的鼠标和键盘,实现了用户通过手指 在传统应用平台上的动作直接与电脑进行对话。它的主要优点是,能够实现同一时间的 多用户交互,多触点交互,并且能够对交互的对象进行识别。多点触摸技术较传统的单 一触点交互技术更灵活,更友好,更具自然性。 本文首先根据 GUI Group提供的多点触摸系统开源程序代码完成了多点触摸人机交 互系统底层软件的剖析。软件功能主要分为四大部分:图像预处理、触摸点识别、运动 跟踪、触点信息的传输。之后在图像预处理步骤
2、中的“图像分割”部分,本文采用了一 种基于大津法(OSTU)的自适应阈值分割方法,使系统能够在一定程度上自动完成在 变光照条件下由灰度图像到二值图像的转化。 其次,考虑到原有特征点跟踪方法算法“KNN(K 最近邻分类算法)”的跟踪滞后 性这一不足,本文基于“最小距离优先算法”改进出了一种适用于多点触摸系统的更高 效的特征点跟踪方法“最小距离触点跟踪算法”,此方法能够更快速的完成对特征点的 识别和跟踪。 最后,手势识别一直是多点触摸技术研究的主要内容,本文定义了几种基本的手 势,并参考相关资料利用 ActionScript 3.0 编程实现了多点触摸技术的简单应用。 实验证明,使用本论文设计的多
3、点触摸底层软件能够正确的检测并跟踪到触 点,完成手势的识别和多点触摸的简单应用;并且利用本文改进的“最小距离触点 跟踪算法”可以很好的提高触点跟踪速率,特征点跟踪滞后时间缩短。 关键词:多点触摸;特征点跟踪;最小距离优先算法;手势定义关键词:多点触摸;特征点跟踪;最小距离优先算法;手势定义 Study on Methods of Multi-touch Human-computer Interaction - II - Based on Optical Induction Abstract In recent years, since users demands on nature and f
4、riend attributes of computers are increasing, a new human-computer interaction technology called multi-touch human-computer interaction technology has been brought up. Multi-touch human-computer interaction technology exceeds the mouse and the keyboard used in traditional ways, making it possible fo
5、r users direct communication with computers through the movements and gestures of fingers on the traditional application interface. Its main advantages are that it supports multi-consumers and multi-points direct interaction at the same time. Whats more, multi-point touch is able to distinguish inte
6、ractive object identification. Compared with traditional single-point touch, it is more flexible, friendlier and more natural for users to use. Firstly, this paper completes the analysis of the ground software of multi-point touch system based on the open source code of multi-point touch system provided by GUI Group. The function of the software is mainly divided into four parts: image pre-processing, the recognition of blobs, movement tracking and the transmission of blob information.