远程医疗系统的实现及其关键技术的研究

设计了一种基于多层客户／服务器结构的远程医疗系统，给出了完全基于Java的系统实现方案，它具有较强的灵活性及异构平台兼容性。对系统中涉及的医学图像压缩技术、医学图像自动归档技术、数据中间件技术进行了讨论并给出了具体的实现方法。系统的运行结果证明了方案的可行性。     

网络虚拟医疗设备现实治疗系统的实现

提出一种基于互联网，结合医疗诊断规划系统TPS，搭建虚拟医疗设备现实治疗系统，该系统结合目前国内外先进技术，实现远程诊断，有助于实现医疗单位数字化和信息化。     

Java技术在远程弱视治疗系统中的应用研究

提出的基于Internet的弱视治疗方案有效解决了传统弱视医疗方法中的诸多弊端。介绍了Java技术在治疗系统中的应用，包括JSP和JavaBeans技术，分析了系统中数据的传输并提出了分布式治疗系统的实现方案。     

Collaborative Virtual Simulation Environment for Radiotherapy Treatment Planning

The simulation of Radiotherapy Treatment Planning (RTP) is a normal procedure in oncology clinics carried out on a Simulator machine. The Virtual Simulation of RTP replaces the real Simulator machine with a virtual one by using the CT data sets of a patient instead of the real patient. In this paper, we present a collaborative virtual simulation environment of RTP, named EU-VIRTUOSO, which is based on volume rendering and telecommunication techniques. The RTP procedure is visualised on a virtual patient, which is created by using the CT data of the patient. Different volume rendering and volume interaction techniques, such as DRR, MIP, gradient surface, and iso-surface, supply physicians with high quality rendering images to simulate the real working environment of the Simulator machine. In the collaborative environment, physicians distributed at different locations can work together via network to plan the treatment or to validate the treatment plan on-line by a collaborative application sharing approach. Both concepts virtualised planning and collaborative planning improve the efficiency and accuracy of a radiotherapy treatment while reducing the effort for an individual patient.     

A Video-Based 3D-Reconstruction of Soccer Games

In this paper we present SoccerMan, a reconstruction system designed to generate animated, virtual 3D views from two synchronous video sequences of a short part of a given soccer game. After the reconstruction process, which needs also some manual interaction, the virtual 3D scene can be examined and 'replayed' from any viewpoint. Players are modeled as so-called animated texture objects, i.e. 2D player shapes are extracted from video and texture-mapped onto rectangles in 3D space. Animated texture objects have shown very appropriate as a 3D representation of soccer players in motion, as the visual nature of the original human motion is preserved. The trajectories of the players and the ball in 3D space are reconstructed accurately. In order to create a 3D reconstruction of a given soccer scene, the following steps have to be executed: 1) Camera parameters of all frames of both sequences are computed (camera calibration). 2) The playground texture is extracted from the video sequences. 3) Trajectories of the ball and the players' heads are computed after manually specifying their image positions in a few key frames. 4) Player textures are extracted automatically from video. 5) The shapes of colliding or occluding players are separated automatically. 6) For visualization, player shapes are texture-mapped onto appropriately placed rectangles in virtual space. SoccerMan is a novel experimental sports analysis system with fairly ambitious objectives. Its design decisions, in particular to start from two synchronous video sequences and to model players by texture objects, have already proven promising.     

Video-based Approach to Human Animation

A method based on computer vision technologies is presented to determine the 3-D spatial locations of joints or feature points of a human body from human motion video. The proposed method first applies the geometric projection theory to obtain a set of feasible postures in some key frames according to predefined 2D video features and 3D-model features correspondence. Next it makes use of the available skeleton controlled human model to get a feasible posture for each key frame. The method is applied to a series of video images to animate artificial 3D human models.     

基于Internet的远程医疗系统设计与实现

文章针对远程医疗跨地域的分布性特点,以及远程医疗中各成员间正确互通与理解医疗数据、共同开展医疗活动的技术需求,提出了一种基于CORBA/WEB技术的分布式远程医疗系统实现框架,并讨论了所涉及的CORBA与WEB互操作方法、数据组织、安全性等关键技术。     

基于UDP的远程医疗信息传输

针对我国目前一些远程医疗方案出现的传输速度较慢等问题,提出了基于TCP/IP协议的因特网环境下使用UDP(用户数据报)协议传输远程医疗信息的方案。在讨论了此方案的可行性及其实现方法之后,给出了用Java语言实现文字、图像等医学信息传输的实例,并提出了一种制作白板的方法。     

一个基于Java Applet的医学影像传输和处理系统

医学影像的传输和处理系统是远程医疗中的重要组成部分,文章给出了一个利用JavaApplet实现远程医学影像传输和处理的完整解决方案。系统由数据读取和图象处理两部分组成,JavaApplet读取数据是利用JDBC三层模式来实现的,图象处理功能的实现主要使用JavaAWT和Java2DAPI。系统在远程医疗中有一定的实用价值,而且具有平台独立、简单易用等特点。     

A lossy 3D wavelet transform for high-quality compression of medical video

In this paper, we present a lossy compression scheme based on the application of the 3D fast wavelet transform to code medical video. This type of video has special features, such as its representation in gray scale, its very few interframe variations, and the quality requirements of the reconstructed images. These characteristics as well as the social impact of the desired applications demand a design and implementation of coding schemes especially oriented to exploit them. We analyze different parameters of the codification process, such as the utilization of different wavelets functions, the number of steps the wavelet function is applied to, the way the thresholds are chosen, and the selected methods in the quantization and entropy encoder. In order to enhance our original encoder, we propose several improvements in the entropy encoder: 3D-conscious run-length, hexadecimal coding and the application of arithmetic coding instead of Huffman. Our coder achieves a good trade-off between compression ratio and quality of the reconstructed video. We have also compared our scheme with MPEG-2 and EZW, obtaining better compression ratios up to 119% and 46%, respectively for the same PSNR.