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.     

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。     

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。     

Augmented Panoramic Video

Many video sequences consist of a locally dynamic background containing moving foreground subjects. In this paper we propose a novel way of re‐displaying these sequences, by giving the user control over a virtual camera frame. Based on video mosaicing, we first compute a static high quality background panorama. After segmenting and removing the foreground subjects from the original video, the remaining elements are merged into a dynamic background panorama, which seamlessly extends the original video footage. We then re‐display this augmented video by warping and cropping the panorama. The virtual camera can have an enlarged field‐of‐view and a controlled camera motion. Our technique is able to process videos with complex camera motions, reconstructing high quality panoramas without parallax artefacts, visible seams or blurring, while retaining repetitive dynamic elements.     

The segmented presentation of visually structured texts: Effects on text comprehension

The effects of a segmented presentation applied to a visually structured text were examined in the context of the explosion of small-screen devices. Empirical research investigating the influence of text signaling on text processing suggests that the text visual structure may influence comprehension by facilitating the construction of a coherent text representation. Undergraduate students were asked to read a text under different segmented conditions varying on the type of information provided about the text visual structure and on the segmentation unit. When the segmented presentation did not supply any information or when it only offered local information about the text visual structure, text comprehension depended on the segmentation unit. When the segmentation unit did not fit the text visual structure, an erroneous text representation was constructed, whereas the compatible segmentation unit led to a correct text comprehension. When the segmented presentation rendered the global text visual structure, the segmentation unit had no effect on comprehension and more readers constructed a correct and close text representation. Thus, the text visual structure seems to play a role in text comprehension and this role has to be taken into account for text segmented presentation.     

An efficient hybrid multicast transport protocol for collaborative virtual environment with networked haptic

In recent years, we have witnessed a growing interest in the synchronous collaboration based class of applications. Several techniques for collaborative virtual environments (CVE), haptic, audio and visual environments (C-HAVE) have been designed. However, several challenging issues remain to be resolved before CVE and C-HAVE become a common place. In this paper, we focus on applications that are based on closely coupled and highly synchronized haptic tasks that require a high-level of coordination among the participants. Four main protocols have been designed to resolve the synchronization issues in such environments: the synchronous collaboration transport protocol, the selective reliable transmission protocol, the reliable multicast transport protocol and the scalable reliable multicast. While these four protocols have shown good performance for CVE and C-HAVE class of applications, none of these protocols has been able to meet all of the basic CVE requirements, i.e., scalability, reliability, synchronization, and minimum delay. In this paper, we present a hybrid protocol that is able to satisfy all of the CVE and C-HAVE requirements and discuss its implementation and results in two tele-surgery applications. This work is partially supported by Grants from Canada Research Chair Program, NSERC, OIT/Ontario Distinguished Researcher Award, Early Research Award and ORNEC Research Grant.     

一种有效的图像口令身份认证方案

分析和比较一次性口令和图像口令的相关技术,指出在开放网络环境下进行身份认证时,图像口令存在的缺陷,并论证采用一次性口令弥补该缺陷的可行性和可靠性。基于一次性口令产生的会话密钥,设计一种有效的图像口令身份认证方案。该方案提高口令的安全性,能够防止窥探攻击和重放攻击。类似技术被应用于更加灵活的实际环境中,并增强了应用系统的安全性。