Lighting the Shroud of Turin for Exhibition in 2015

ABSTRACT

Lighting a cultural heritage artifact requires balancing visual perception with preventive conservation, by providing the best lighting (in terms of spectral distribution and quantity) to enable the viewer to appreciate details and color, while limiting photo-induced degradation. The paper outlines the methodology applied by a multi-disciplinary team while lighting the Shroud of Turin at its last public exhibition in 2015. The methodology considered the special requirements of the Shroud, including exposure to ultraviolet light, while providing appropriate display conditions that would meet audience expectations. The desired appearance (readability of the body image and color) was defined with the help of Shroud researchers and confirmed by subjective tests, while appropriate light levels for preservation were set in agreement with standard requirements and using knowledge of the degradation of linen in visible and UV light. The installation provided a controlled environment and a managed visitor route to the Shroud, assuring excellent perception of both details and color, with the lowest illuminance level about 15?lx.     

Example based painting generation

INTRODUCTION Non-photorealistic rendering (NPR) is a domain of computer graphics that has received more and more attention in the past decade. Different from realistic rendering, NPR concentrates on communicating the main context of an image and explores the rendering effect of the scene with the artistic styles, rather than seeking subtle geometry details and naturally physical attribute. Many research efforts were dedicated to simu- lating the traditional media (Hertzmann et al., 2001…     

图形绘制技术课程综合性实验设计

针对图形绘制技术课程以往实验设计中存在的覆盖面窄、原理理解困难、程序实现难度大以及学生参与度低的问题,设计了“真实感图形绘制演示系统”综合性课程实验。该实验贯穿于理论教学全过程,能够加深学生对真实感图形绘制中关键理论的直观理解,促进学生对核心技术的掌握并提升学生图形系统开发能力,激发学生对图形绘制技术的学习热情。     

Learning Acetabular Fracture Classification using a Three-Dimensional Interactive Software: A Randomized Controlled Trial

Acetabular fractures are a real challenge for junior doctors as well as experienced orthopedic surgeons. Correct fracture classification is crucial for appreciating the fracture type, surgical planning, and predicting prognosis. Although three-dimensional (3D) tutorial is believed to improve the understanding of the complex anatomy structure, there have been few applications and randomized controlled trials to confirm it in orthopedics. This study aims to develop a 3D interactive software system for teaching acetabular fracture classification and evaluate its efficacy. Participants were randomly but evenly allocated into either the experimental group (who learned the acetabular fracture classification using a 3D software) or the control group (who used a traditional two-dimensional [2D] tutorial). Both groups were then tasked to classify 10 acetabular fractures and complete a five-point Likert scale on their satisfaction of each learning modality. To calculate significance (P < 0.05), independent t-test was used for normally distributed data whereas Mann-Whitney U test for non-normally distributed data. The experimental group significantly outperformed the control group (t (28) = 2.526, P = 0.017) with identifying correct acetabular fracture classification. Moreover, Likert scale score in the experimental group was also significantly higher than in the control group (Z = 2.477, P = 0.013). This 3D classification software has objectively and subjectively showed an advantage over the traditional 2D tutorial, resulting in an improved classification accuracy and higher Likert scale score. The 3D software has the potential to improve both clinical knowledge as well as identifying correct patient management in orthopedics.     

英文规定性法律文本中的同义词翻译——功能对等理论视角

根据奈达的功能对等理论,结合法律翻译研究者的理论和观点,理论联系实际,提出在翻译英文规定性法律文本中的同义词时,可以采用分别翻译和联合统一翻译的处理方式,实现法律文本翻译准确性的基本原则,达到形式、内容和效力等同的法律文本翻译标准。     

数据场体视化方法综述

数据场体视化使人们可以从一幅图象里感受到数据整体的信息．本文研究了大量体视化方面文献后,总结了体视化的研究方法,并提出了当前的研究热点及今后的研究方向．     

Real time exploration and management of large medical volumetric datasets on small mobile devices—Evaluation of remote volume rendering approach

In this paper I present the architecture of system that can be used for real time exploration and management of large medical volumetric datasets. The new state of the art solution presented in this paper is an example of visual data management system. System prototype evaluation proved that it is possible to use low-powered (and cheap) up-to-date mobile devices with programmable GPUs as the remote interfaces for exploration of large volumetric medical data. The implementation was done with high-level programming language that enables portability between different hardware models. The lack of lossy compression enables to display high quality medical images visualizations without any simplifications and noises in frequency domain. The prototype of system is capable to remotely render and send to a client (for example cell phone or tablet) rendered data with frequency 30 fps with limited resolution during interaction. One second after the interaction is finished client machine receives full resolution image. The evaluation of the system was performed on volumetric computed tomography angiography image with approximate size 512³ voxels.     

基于点云的典型地貌全局光渲染方法的改进及实现

针对典型地貌全局光渲染中的重点问题:环境遮挡以及色溢的渲染效率和效果,提出光线追踪、光能传递以外的另一种改进方法——点云计算方式。分析了点云算法的原理、特点和优越性,选取张家界石英砂岩峰林地貌三维模型作为样本,测试和比较了光线追踪和点云计算方法的实际效果,实验表明点云计算方式有更高的效率和更好的表现效果,论文也为其他典型地貌的全局光渲染提供了可行的制作方案和流程。     

基于摄影棚模式的计算机三维产品渲染研究

通过对产品摄影的评价因素和对摄影棚拍摄特点的分析,分别以白色和黑色为渲染背景,建立了基于摄影棚模式的三维产品渲染流程。在虚拟摄影棚左侧、右侧和顶部建立三盏不同的矩形灯光,并结合材质设置和渲染参数设置,就能够渲染出白色背景的精美产品效果图;黑色背景的渲染是以一盏背景灯将产品从黑色背景中烘托出来,并利用模糊倒影来增强产品的立体感;还分析了产品渲染中实景匹配的两种方式,并提出透明材质物体渲染的注意事项。以渲染器Vray为实验平台,渲染结果真实度高。     

多视点视频编码预测结构的研究

不同的多视点视频序列具有不同的时空相关性,MVC采用的分层B帧预测结构无法充分利用视频序列的属性。本文提出了一种能适应不同视频序列编码的方法,通过研究多视点视频图像中的时空相关性和视点间的相关性,适当地取消部分时间层的视点间预测并且对所有P视点的非关键帧均采用视点间预测和调整了I视点的位置。实验结果表明,本文方法在提高编码效率的同时使得预测结构具有更好的随机访问性能、更低的编码复杂度。