research on three-dimensional interaction technique for smartphone

利用智能手机的多通道输入和输出功能可为解决大屏幕远距离交互提供了一条有效途径.通过分析大屏幕远距离交互的特点,给出了一个基于智能手机的三维交互框架;针对利用惯性传感器的计算智能手机空间姿态问题,结合交互的特点提出了一种实时、快速、准确地解算手机的空间姿态的算法;基于手机的空间姿态和触摸交互,针对大屏幕交互中二维交互与三维交互分别设计了2类交互技术,并给出3个应用实例.最后通过实验对这3个实例进行了实验评估,结果表明智能手机在大屏幕、远距离交互中是合理与有效.国家“九七三”重点基础研究发展计划项目(2009CB320804)|国家自然科学基金(61173059,61135003,61232013

ITSUIM:一种面向交互桌面的用户界面模型

中国计算机学会 中国自动化学会 中国图学学会 中国图象图形学学会 中国系统仿真学

Left-Right hand distinction for multi-touch tabletop interaction

现有多触点交互桌面系统通常只提供触点位置、形状等信息,不包括触点左右手归属信息.触点所属手及左右手手性信息的提供,对于多指手势识别、丰富双手交互 技术,尤其是非对称双手交互技术具有重要意义.基于手的解剖结构特征,提出一种不需辅助硬件设备的触点左右手归属判定方法.首先,以手势设计的基本原则为 指导,根据手的解剖结构特征,提出交互桌面手-臂系统三角形模型;其次,基于该三角形模型,给出多触点交互桌面同手触点聚类方法及左右手识别方法;然后, 对MTDriver做扩展,实现了提供左右手信息的多触点跟踪工具箱,并提出了基于左右手信息的交互桌面交互技术;最后,评估结果表明,同手触点聚类方法 及触点左右手手性识别方法均具有较高的正确率,而且在时间性能方面满足交互桌面交互实时性要求.In a multi-touch interactive system, distinguishing between user's left and right hands is of great significance for recognizing multi-finger gestures and further fully exploring the potential of bimanual interaction. However, the function of left-right hand distinction is beyond the capability of most multi-touch systems. In this paper, a robust solution to the left-right hand distinction based on the anatomical structure characteristic of hand is presented. Firstly, guided by the basic principles of gesture designing, the interactive tabletop hand-arm triangle model is proposed based on the anatomical structure characteristic of hand. Secondly, multi-touch interactive tabletop same hand contact points clustering method and left-right hand recognizing method are given based on the triangle model. Then, the methods are integrated into MTDriver to detect and send contact points's left-right information to the multi-touch applications and new bimanual interactive technologies are demonstrated. Finally, evaluation shows that the solution can achieve high recognition accuracy and good time performance that could support fluency bimanual interaction on interactive tabletop. © Copyright 2014, Institute of Software, the Chinese Academy of Sciences. All rights reserved

mtbuilder: a user interface toolkit for multi-touch tabletop

针对基于WIMP范式的图形用户界面工具不能解决多触点交互桌面的多指手势识别、界面组件朝向等问题,提出基于自然用户界面通用隐喻OCGM(objects,containers,gestures and manipulations)的多触点交互桌面界面工具箱——MTBuilder.首先用层次化多触点数据表示模型存储多触点数据,然后对多指手势识别器进行动态管理以加速识别处理,最后基于OCGM设计并实现界面组件库.通过多人信息浏览、城市规划等原型系统的开发和实验评估可以看出,MTBuilder能够为交互桌面界面构造与快速原型系统开发提供强有力的支持.国家自然科学基金(U0735004,60673188)|国家“九七三”重点基础研究发展计划项目(2009CB320804)|国家“八六三”高技术研究发展计划(2009AA01Z337,2009GJA00045)|浙江大学CAD&CG国家重点实验室开放课题(A1009)To address the issue in multi-touch tabletop that the WIMP paradigm-based graphical user interfaces could not handle multi-finger gesture recognition and UI component reorientation, this paper proposes a new multi-touch tabletop UI toolkit, termed MTBuilder, based on the universal foundational metaphors OCGM(objects, containers, gestures, and manipulations). First MTBuilder employs a hierarchical data representation model to store the multi-finger information. Then it configures the gesture recognizers dynamically to improve the efficiency of recognition. Finally design the components of the user interface based on OCGM. Several typical prototypes are developed, such as multi-user InfoScan and city planning. The prototypes and the experimental results showed that MTBuilder can efficiently support construction and prototyping of a tabletop user interface

20世纪80年代末以来中国土地利用变化的基本特征与空间格局[J]

土地利用/土地覆被变化(LUCC)是人类活动与自然环境相互作用最直接的表现形式,本文采用相同空间分辨率的卫星遥感信息源和相同的技术方法,对中国1980年代末到2010年土地利用变化数据进行定期更新。在此基础上,提出并发展土地利用动态区划的方法,研究土地利用变化的空间格局与时空特征。我们发现:1990-2010年的20年间,中国土地利用变化表现出明显的时空差异。"南减北增,总量基本持衡,新增耕地的重心逐步由东北向西北移动"是耕地变化的基本特征;"扩展提速,东部为重心,向中西部蔓延"是城乡建设用地变化的基本特征;"林地前减后增,荒漠前增后减,草地持续减少"是非人工土地利用类型变化的主要特征。20世..