Hologram-like transmission of pictures

A new digital representation of pictures is proposed. The main feature of this representation is: Given a string of data Z representing a picture with full resolution, various substrings of Z represent the same picture with appropriately lower resolution. This is analogous to a well-known property of holograms. The new representation is based on a particular picture traversal algorithm and uses overlapping sampling areas. The paper presents the principle of this representation, analyzes its overhead, and provides examples of picture reconstruction. An application of the hologram-like representation to the transmission of pictures with progressive resolution is indicated.     

Browsing High Definition Colour Pictures

The authors describe a method of presenting colour pictures which allows users to browse by panning and zooming. The pictures are seen as though on a 512 by 512 by 12 bit framestore, but are defined to 4096 by 4096. The implementation allows the entire picture to be seen in overview, with fine details averaged, or to be zoomed in upon with finer detail progressively revealed by a sequence of twofold linear magnifications. Further zooming, beyond the resolution of the picture data, automatically produces a conventional pixel replication effect. In addition, the picture may be panned vertically or horizontally.     

基于TCP/IP的DICOM网络通讯模型实现

DICOM标准是现代医学图像存储与传输系统(PACS)的核心,由于大多数PACS系统是建立在TCP/IP协议之上的,因此实现基于TCP/IP的DICOM网络通讯十分重要。该文通过对DICOM标准的理解和分析,采用C++语言分三个步骤实现目标:TCP/IP接口交互功能的实现、DICOM上层协议的实现、DICOM消息交换的实现。并以存储消息服务为例实现基于TCP/IP的DICOM网络通讯模型。     

数字博物馆应用研究

本文参考借鉴了国内外一些著名博物馆智能化和信息化系统所采用的技术,从应用研究的角度出发,论述数字博物馆的体系结构和元数据组织方案,以及数字博物馆应用开发中的某些关键技术,立足构建数字博物馆开发环境,形成商品化的数字博物馆软件产品。研究成果已经成功应用于上海博物馆、上海市文物管理委员会信息化建设中,通过研究成果的进一步产业化,可应用于全国3000多文博单位,以期为中国乃至国际的数字博物馆工程建设提供有益的帮助。     

利用C#语言实现图像的打开、处理和存储

采用C#语言实现图像的显示,图像背景的更换,图像的平移,旋转及缩放几种功能.     

PACS设计与实现中的几个关键问题

医学图像归档及通信系统（PACS）的设计与实现是医学图像处理领域的研究热点,同时对医院构建放射学信息系统、医院信息系统有着重要意义。结合开发图像归档服务器的经验,分析和探讨了PACS设计和实现中的几个关键问题,比如PACS的功能选择、PACS底层通信协议的选择、数据库的管理、图像存储媒体的选择、图像诊断工作站的选择、支持远程医疗的WEB数据发布策略等等。最后,阐述了一个新构建的小型PACS的机构和主要技术。     

Optimizing stereo‐to‐multiview conversion for autostereoscopic displays

We present a novel stereo‐to‐multiview video conversion method for glasses‐free multiview displays. Different from previous stereo‐to‐multiview approaches, our mapping algorithm utilizes the limited depth range of autostereoscopic displays optimally and strives to preserve the scene's artistic composition and perceived depth even under strong depth compression. We first present an investigation of how perceived image quality relates to spatial frequency and disparity. The outcome of this study is utilized in a two‐step mapping algorithm, where we (i) compress the scene depth using a non‐linear global function to the depth range of an autostereoscopic display and (ii) enhance the depth gradients of salient objects to restore the perceived depth and salient scene structure. Finally, an adapted image domain warping algorithm is proposed to generate the multiview output, which enables overall disparity range extension.     

Authorware在《工程制图》CAI课件中的应用

介绍了Authorware在《工程制图》CAI课件中图片显示、按钮制作、声音处理、播放速度、程序打包等方面的应用技巧。     

基于多尺度DEM的雷达仿真图像生成

为了改进目前应用于雷达仿真图像生成的数字高程模型DEM(Digital Elevation Model)中存在的不足,引入"不规则地形起伏参数"来动态调整生成DEM的采样间隔和密度,并根据导航雷达的方位和距离分辨能力,建立了基于多尺度DEM雷达仿真图像生成方法.应用结果表明,该方法对量程范围内、外的地形模型数据采用了不同的分辨率,所生成的仿真图像近处细节逼真,远处显示地形轮廓,大大提高了各种量程下的雷达图像生成速度,该成果已经应用于雷达模拟器的研制中.     

Real‐time Depth of Field Rendering via Dynamic Light Field Generation and Filtering

We present a new algorithm for efficient rendering of high‐quality depth‐of‐field (DoF) effects. We start with a single rasterized view (reference view) of the scene, and sample the light field by warping the reference view to nearby views. We implement the algorithm using NVIDIA's CUDA to achieve parallel processing, and exploit the atomic operations to resolve visibility when multiple pixels warp to the same image location. We then directly synthesize DoF effects from the sampled light field. To reduce aliasing artifacts, we propose an image‐space filtering technique that compensates for spatial undersampling using MIP mapping. The main advantages of our algorithm are its simplicity and generality. We demonstrate interactive rendering of DoF effects in several complex scenes. Compared to existing methods, ours does not require ray tracing and hence scales well with scene complexity.