Non-reference virtual view quality evaluation of MVD

The quality of virtual view based on multi-view video (MVD) plus depth format is often evaluated by PSNR or subjectively judged. However, due to synthesizing arbitrary view images, the virtual view images mostly have no reference images and are only assessed using non-reference. Virtual view images synthesized by depth estimation reference software (DERS) and view synthesis reference software (VSRS) often accompanied with blockiness and other distortions on the edge. In addition, matching level for the depth map and the corresponding texture maps of left and right views also affects the quality of the virtual view. This paper compares the edge similarity of the depth and the corresponding texture maps which generate the intermediate virtual view and combined with the virtual view’s blockiness which causing blur to evaluate the quality of the virtual view. Experiment results show that the proposed method can reflect the quality of the virtual view better.     

3DV quality model based depth maps for view synthesis in FTV system

Depth maps are used for synthesis virtual view in free-viewpoint television (FTV) systems.When depth maps are derived using existing depth estimation methods,the depth distortions will cause undesirable artifacts in the synthesized views.To solve this problem,a 3D video quality model base depth maps (D-3DV) for virtual view synthesis and depth map coding in the FTV applications is proposed.First,the relationships between distortions in coded depth map and rendered view are derived.Then,a precisely 3DV quali...     

An IBR method: Panoramic mosaics of slit images with depth

Providing a wider movement range of virtual camera is an unsolved problem for state-of-the-art image-based rendering system. In this paper, we present a new image based rendering technology called panoramic mosaics of slit images with depth that can provide large virtual camera motion region for some scenes. By limiting camera motion to a horizontal plane only, a slit image with united depth value is used as the rendering element. The panoramic mosaics of slit images with depth are easy to capture, and the data size is as small as that of panorama. We present here the capturing, construction as well as rendering process of panoramic slit images mosaic with depth. In addition, we present the join up process of multiple panoramic slit images mosaic with depth. Project(69823003) supported by NSFC     

AN IBR METHOD:PANORAMIC MOSAICS OF SLIT IMAGES WITH DEPTH

ＩＮＴＲＯＤＵＣＴＩＯＮＴｒａｄｉｔｉｏｎａｌｃｏｍｐｕｔｅｒｇｒａｐｈｉｃｓｔｒｙｔｏｇｅｎｅｒａｔｅｒｅａｌｉｓｔｉｃｓｃｅｎｅｖｉｅｗｆｒｏｍａｇｅｏｍｅｔｒｉｃｍｏｄｅｌ.Ｃｏｍｐｕｔｅｒｖｉｓｉｏｎｅｘｔｒａｃｔｇｅｏｍｅｔｒｉｃｍｏｄｅｌｂｙａｎａ ｌｙｚｉｎｇｉｍａｇｅｓｆｒｏｍｔｈｅｒｅａｌｓｃｅｎｅ .Ｃｏｍｂｉｎｉｎｇｔｈｅｍｔｏｇｅｔｈｅｒｇａｖｅｕｓｔｈｅｉｄｅａｏｆｉｍａｇｅ ｂａｓｅｄｒｅｎｄｅｒｉｎｇ (ＩＢＲ ) ,ｗｈｉｃｈｇｅｎｅｒａｔｅｓｒｅａｌｉｓｔｉｃｓｃｅｎｅｖ…     

Depth estimation system suitable for hardware design

Depth estimation is an active research area with the developing of stereo vision in recent years. It is one of the key technologies to resolve the large data of stereo vision communication. Now depth estimation still has some problems, such as occlusion, fuzzy edge, real-time processing, etc. Many algorithms have been proposed base on software, however the performance of the computer configurations limits the software processing speed. The other resolution is hardware design and the great developments of the digital signal processor (DSP), and application specific integrated circuit (ASIC) and field programmable gate array (FPGA) provide the opportunity of flexible applications. In this work, by analyzing the procedures of depth estimation, the proper algorithms which can be used in hardware design to execute real-time depth estimation are proposed. The different methods of calibration, matching and post-processing are analyzed based on the hardware design requirements. At last some tests for the algorithm have been analyzed. The results show that the algorithms proposed for hardware design can provide credited depth map for further view synthesis and are suitable for hardware design.     

Windows环境下的VMWare虚拟组网应用研究

VMware虚拟机应用越来越广泛,它可以用于构建复杂的实验环境,也可以直接服务于企业生产。简要介绍了VMware虚拟机软件,着重分析了VMware虚拟机软件的网络连接模式,并对各种模式的应用进行了探讨,对于VMware虚拟机的使用者有一定的指导和借鉴意义。     

虚拟实训系统中软件研发过程管理研究

编程类课程的虚拟实训大都侧重于服务器响应客户端程序的算法与技术研究,而缺乏对软件研发过程管理的仿真。本文以web数据库技术这一课程的虚拟实训为载体,无需另行开发软件,借助BB平台的优势,并在其上定制,创新性地实现了对软件研发环境的模拟、研发过程的控制及工作量的考核。这种软件研发过程管理模型成本低、易于实现,对编程类课程的虚拟实训建设具有一定的参考意义。     

Visualization of stereoscopic anatomic models of the paranasal sinuses and cervical vertebrae from the surgical and procedural perspective

Recent improvements in three‐dimensional (3D) virtual modeling software allows anatomists to generate high‐resolution, visually appealing, colored, anatomical 3D models from computed tomography (CT) images. In this study, high‐resolution CT images of a cadaver were used to develop clinically relevant anatomic models including facial skull, nasal cavity, septum, turbinates, paranasal sinuses, optic nerve, pituitary gland, carotid artery, cervical vertebrae, atlanto‐axial joint, cervical spinal cord, cervical nerve root, and vertebral artery that can be used to teach clinical trainees (students, residents, and fellows) approaches for trans‐sphenoidal pituitary surgery and cervical spine injection procedure. Volume, surface rendering and a new rendering technique, semi‐auto‐combined, were applied in the study. These models enable visualization, manipulation, and interaction on a computer and can be presented in a stereoscopic 3D virtual environment, which makes users feel as if they are inside the model. Anat Sci Educ 10: 598–606. © 2017 American Association of Anatomists.     

大众传播与文化自觉

大众传播环境下,当代人更容易被媒介所制造的“虚性世界”左右,人们对纷繁复杂的世界的了解,更多地依仗传媒的介绍。而大众传媒在对这一“虚性世界”构成中,对于假相负有责任。“文化自觉”首先应从传媒做起。     

管窥在线学习之影响因素——文化的视角

作为数字时代的一种新型学习方式,在线学习已经引起了社会的广泛关注,并在人们的学习、工作和生活中扮演着日益重要的角色,其价值已凸显在整个教育领域。目前对在线学习的研究也日益深入。本文在参照相关研究的基础上,尝试从文化的视角审视在线学习,以在线学习的范例——教育虚拟社区为例,从社区的建设、社区的成员及在线学习的教与学三方面谈一下点滴之见。     

Stepwise approach for view synthesis

This paper presents some techniques for synthesizing novel view for a virtual viewpoint from two given views captured at different viewpoints to achieve both high quality and high efficiency. The whole process consists of three passes. The first pass recovers depth map. We formulate it as pixel labelling and propose a bisection approach to solve it. It is accomplished in log2n（n is the number of depth levels） steps,each of which involves a single graph cut computation. The second pass detects occluded pixels and reasons about their depth. It fits a foreground depth curve and a background depth curve using depth of nearby foreground and background pixels,and then distinguishes foreground and background pixels by minimizing a global energy,which involves only one graph cut computation. The third pass finds for each pixel in the novel view the corresponding pixels in the input views and computes its color. The whole process involves only a small number of graph cut computations,therefore it is efficient. And,visual artifacts in the synthesized view can be removed successfully by correcting depth of the occluded pixels. Experimental results demonstrate that both high quality and high efficiency are achieved by the proposed techniques.     

GPU-based leaves contour generation algorithm

The implementation and optimization of the traditional contour generation algorithms are always proposed for the common processor. When processing high resolution images, the performance often exists low efficiency. A new graphics processing unit (GPU)-based algorithm is proposed to get the clear and integrated contour of leaves. Firstly we implement the classic Sobel operator of edge detection in GPU. Then a simple and effective method is designed to remove the fake edge and a heuristic algorithm is used to repair the broken edge. It is proved by the experiments that the results of our algorithm are natural and realistic in terms of morphology and can be good materials for the virtual plant.     

Depth-aided inpainting for disocclusion restoration of multi-view images using depth-image-based rendering

A new algorithm is proposed for restoring disocclusion regions in depth-image-based rendering （DIBR） warped images. Current solutions include layered depth image （LDI）, pre-filtering methods, and post-processing methods. The LDI is complicated, and pre-filtering of depth images causes noticeable geometrical distortions in cases of large baseline warping. This paper presents a depth-aided inpainting method which inherits merits from Criminisi＇s inpainting algorithm. The proposed method features incorporation of a depth cue into texture estimation. The algorithm efficiently handles depth ambiguity by penalizing larger Lagrange multipliers of flling points closer to the warping position compared with the surrounding existing points. We perform morphological operations on depth images to accelerate the algorithm convergence, and adopt a luma-first strategy to adapt to various color sampling formats. Experiments on test multi-view sequence showed that our method has superiority in depth differentiation and geometrical loyalty in the restoration of warped images. Also, peak signal-to-noise ratio （PSNR） statistics on non-hole regions and whole image comparisons both compare favorably to those obtained by state of the art techniques.     

CAD技术在齿轮减速器拟实造型中的应用

在圆弧齿斜齿轮减速器的计算机拟实造型和拟实装配中,综合应用AUTOCAD和3DS MAX软件,可使各自的技术优势得到充分发挥,从而使减速器拟实造型和拟实装配工作得以高效、优质完成。其中表现出的技术策略和方法可为其他机械产品的拟实造型和拟实装配工作提供借鉴。     

基于3DSMAX的泉州西湖公园三维漫游动画的实现

从构建虚拟公园漫游系统的一般步骤出发,阐述了构建虚拟漫游动画的一般技术,包括绘制平面图、建模、材质、灯光、摄影机的添加及制作动画关键技术．通过计算机软件制作泉州西湖公园效果图,结合动画技术的表达,三维动态浏览,展示泉州西湖公园的面貌．     

Building virtual models by postprocessing radiology images: A guide for anatomy faculty

Radiology and radiologists are recognized as increasingly valuable resources for the teaching and learning of anatomy. State‐of‐the‐art radiology department workstations with industry‐standard software applications can provide exquisite demonstrations of anatomy, pathology, and more recently, physiology. Similar advances in personal computers and increasingly available software can allow anatomy departments and their students to build their own three‐dimensional virtual models. Appropriate selection of a data‐set, followed by processing and presentation are the key steps in creating virtual models. The construction, presentation, clinical application, and educational potential of postprocessed imaging techniques including multiplanar reformats, minimum intensity projections, segmentation, volume‐rendering, surface‐rendering, fly‐throughs, virtual endoscopy, angiography, and cine‐loops are reviewed using examples created with only a personal computer and freeware software. Although only static images are presented in this article, further material is available online within the electronic version of this article. Through the use of basic and advanced image reconstruction and also paying attention to optimized presentation and integration, anatomy courses can be strengthened with appropriate radiological material. There are several key advantages for the anatomy department, which is equipped with the ability to produce virtual models using radiology images: (1) Opportunities to present anatomy using state‐of‐the‐art technology as an adjunct to current practices, (2) a means to forge an improved relationship with the local radiology department, and (3) the ability to create material locally, which is integrated with the local curriculum avoiding the problem of information overload when using the internet or other commercially available resources. Anat Sci Educ 3:261–266, 2010. © 2010 American Association of Anatomists.     

基于软件的PLC虚拟实验系统的实现

针对PLC课程实验,开发了一种基于软件的PLC虚拟实验系统,满足了PLC课程实验的要求。介绍了PLC虚拟实验系统的原理,以电机顺序起动为例叙述了虚拟实验系统的实现过程,最后简单介绍了PLC虚拟实验系统的使用方法。     

Anatomical Sciences Education Vol. 7, Issue 5, 2014 Cover Image

ON THE COVER: Students at the University of Bristol in the UK using virtual microscopy in the histology teaching laboratory . In this issue of ASE, Dr Margaret Gatumu and co‐authors describe how virtual microscopy (VM), alongside traditional light microscopy, is used in histology teaching and learning for medical, dental and veterinary students. Students work in pairs or small groups facilitated by teachers to select, explore and annotate VM images as seen on individual desktop computer screens. A printed handbook guides the students through the slides. Student‐led learning is supplemented by lecture‐demonstrations by a teacher delivered from a podium; the view from the teacher's computer is visible throughout the laboratory on drop‐down projector screens. Photograph by Derek Carr.     

Lotus LearningSpace在高等特殊教育教学领域的应用

Lotus LearningSpace是Lotus在知识管理策略基础上推出的最新教学解决方案,旨在提供一个可协作、可按计划、辅助指导、分布式的虚拟学习环境。Lotus LearningSpace简体中文版,为国内有关高等特殊教育的研究机构提供了一个很好的参考。斯塔福德郡大学的实验表明,相关软件开发必须要了解各类残疾人群的特点,考虑残疾学生的主要缺陷,开发专门适合残疾学生的、适用领域广泛的虚拟学习系统。