Performance of estimating depth in projection based stereoscopic virtual display

Accurate distance estimation is essential for effective user interaction with objects appearing in the virtual space. Research has shown that the distance estimation in the virtual space is not as accurate as that in the real world. The inaccuracy phenomenon is almost exclusively documented for estimating objects appearing straight ahead of the eye. A collection of the accuracy data for targets located in different angles of view in the visual field may be useful in aiding the design of user‐virtual object interaction. This study collected the object to object distance estimation accuracy for targets displayed stereoscopically. There are five horizontal and two vertical viewing angles and three depths, resulting in a total of 30 locations in the virtual space. The distance estimation for any of the 30 object pairs were performed with or without the aid of spatial cues. Significant factors influencing the accuracy and time of distance estimation were identified. Implications of the finding were discussed with respect to the stereoscopic display environment.     

基于智能视觉的透明液体可见异物检测软件设计

目前在国内的透明液体生产线上,液体通常采用人工检测,效率低、准确率,所以基于图形处理算法以及QT,设计了一套基于智能视觉的透明液体杂质颗粒检测软件,重点实现了软件与算法的改进优化;获取的连续图像经自适应中值滤波预处理去除图像噪声后,通过改进的序列图像二次差分算法提取出序列图中的细小的异物,然后根据通过SIFT特征度量的MeanShift目标跟踪算法,跟踪液体图像中的细小异物;并根据异物的运动轨迹及大小,检测到有无异物以及异物的类型,进而进一步判断透明药品质量是否合格;结果测试表明,软件的准确率达到95%以上,检测分辨率达到了44μm,基本可以替代透明液体生产线上的人工检测。     

机载控制视觉目标定位系统的设计与实现

机载控制视觉目标定位系统广泛应用于航空控制领域,对其进行设计和实现具有重要应用意义;针对机载控制视觉目标定位的特征,设计并实现了机载控制视觉目标定位系统,分析了系统的总体结构,包括视觉模块、飞控模块、导航模块以及无线传输模块,给出了系统主控箱、CAPA800主控制器、PCI04总线标准的主板、视觉传感器、PM1270T144C5N芯片的硬件结构,给出了系统的软件流程和视觉处理模块的流程,分析了基于CCS3.3代码开发调试平台的系统代码设计,最终实现机载控制视觉目标定位系统的设计与实现;实验结果说明,所设计系统获取的机载控制视觉目标清晰、有效,并且具有较高的目标定位效率和精度.     

DrawBot: a bio-inspired robotic portraitist

Abstract

We are developing the control architecture of a portraitist artificial agent called DrawBot that reproduces the visuomotor behaviour of a human carrying out a realistic portrait. The visuomotor strategy adopted by DrawBot is based on computational models of eye movements in human beings,and one xperimental findings on eye-hand coordination in expert draughtsmen. In this paper we present a behavioural model of the visuomotor coordination adopted by a draughtsman, designed in terms of visual routines.Eventually we outline the implementation of the basic routines.     

基于Web增强现实的高拱坝仓面施工可视化仿真研究

针对现有的高拱坝施工仿真将浇筑坝块作为最小单元进行仿真研究,忽略了浇筑坝块仓面内部胚层间施工过程的仿真,同时仿真结果的可视化手段与现场割裂,无法在任意场景结合现场实际画面进行结果分析和方案安排的问题,提出基于Web增强现实的高拱坝仓面施工可视化仿真方法。该方法主要包括两个方面:(1)对高拱坝仓面施工过程进行分析,构建高拱坝仓面施工精细仿真模型,并通过仿真计算获得仓面施工各个工序的施工历时;(2)采用Web增强现实技术将设计信息及仿真成果注册至施工现场图像,实现了信息在真实仓面上的直观展示,并实现Web浏览器跨平台的交互分析。结合实际工程开展了研究,结果表明,该方法实现了高拱坝施工进度的精细仿真并提高了可视化水平,施工管理人员可以便捷地结合现场实际情况对施工进度进行分析管理,从而保证大坝按时竣工。     

Skeleton pruning as trade-off between skeleton simplicity and reconstruction error

The position and orientation of moving platform mainly depends on global positioning system and inertial navigation system in the field of low-altitude surveying, mapping and remote sensing and land-based mobile mapping system. However, GPS signal is unavailable in the application of deep space exploration and indoor robot control. In such circumstances, image-based methods are very important for self-position and orientation of moving platform. Therefore, this paper firstly introduces state of the art development of the image-based self-position and orientation method (ISPOM) for moving platform from the following aspects: 1) A comparison among major image-based methods (i.e., visual odometry, structure from motion, simultaneous localization and mapping) for position and orientation; 2) types of moving platform; 3) integration schemes of image sensor with other sensors; 4) calculation methodology and quantity of image sensors. Then, the paper proposes a new scheme of ISPOM for mobile robot — depending merely on image sensors. It takes the advantages of both monocular vision and stereo vision, and estimates the relative position and orientation of moving platform with high precision and high frequency. In a word, ISPOM will gradually speed from research to application, as well as play a vital role in deep space exploration and indoor robot control.     

流量经营分析及智能管道建设

在全业务运营和移动互联网时代,数据业务已经成为中国移动新的利润增长点,本文分析了中国移动如何通过搭建智能管道,化解流量经营新挑战以及运营中的矛盾,提出了围绕流量感知、管控、优化和灵活计费4大能力搭建智能管道。     

基于Matlab与VC的弱视视功能检查系统的设计与实现

弱视是一种发育紊乱性疾病,我国弱视患者检出率高达2.8%。对弱视视功能进行检查可以帮助医生更准确判定病情,从而制定有效的个性化治疗方案。针对弱视患者存在的视功能缺损模式,采用心理物理学的阈限算法,设计了弱视视功能检查系统。系统软件部分利用VC中的MFC以及Matlab的Psychophysics Toolbox实现视功能检查模块,通过SQL Server建立后台数据库记录检查数据。同时,为了达到心理物理学上对视功能检查的特殊显示要求,硬件部分加入了Vedio Switcher进行输出视频信号的转换。系统经临床实际试用,表明系统稳定性好,能满足弱视视功能检查的特殊临床需要。     

适应视觉感知的块效应消除算法

针对编码图像出现块效应的现象,提出一种以人类视觉感知驱动的块效应消除算法。传统块效应消除算法经常会导致图像边缘丢失,为了解决这个问题,本文对块效应影响像素应用自适应滤波器和模糊推理技术。仿真结果表明算法可以获得比传统算法更好的效果。     

基于Web服务的可视化作战想定生成系统设计与实现

设计一个基于Web服务的可视化作战想定生成系统,该系统实现了与具体仿真系统的松散耦合,能够跨越C4ISR系统、作战仿真应用、想定生成系统等仿真系统底层数据结构的异构性,快速重用分布仿真系统的想定资源,提高想定开发效率,并使仿真系统之间的互操作更加灵活。