A Database System to Advance Subsurface Sensing and Imaging

The CenSSIS Image Database System is a scientific database that enables effective collaboration, scientific data sharing and accelerates fundamental research. We describe a state-of-the-art system that uses the Oracle RDBMS and J2EE technologies to provide remote, Internet-based data access. The system incorporates efficient submission and retrieval of images and metadata, indexing of metadata for efficient searching, and complex relational query capabilities.     

基于相机溯源的潜在不良视频通话预警

目前主流的不良视频检测大多基于视频内容分析,属于计算密集型任务,不利于巨量视频通话流的实时检测。为此,本文试图从新的视角来阻断潜在不良视频的传播,即实时视频流相机溯源。和传统检测内容的方法不同,本文试图通过检测产生不良视频的相机源来阻断潜在不良视频的传播,即一旦发现某个正在视频通话的手机产生过不良视频,就发出安全警告进行阻断。该思路的基本假设是拍摄过不良视频的手机拥有者有更大概率利用同一部手机拍摄不良视频。该思路的核心问题是寻找一种实时、可靠的相机溯源方法。为此,本文主要聚焦以下三方面工作:建立了一个包含100部视频的数据库用于算法评估,数据库中的视频来自25部不同型号、不同品牌的相机,每一部视频注明了相机来源;建立了一种简单、有效的视频相机溯源机制,实现相机的在线实时溯源;提出了一种多相机指纹特征集成决策模型,实现可靠的相机溯源。实验结果显示,所提相机溯源机制能满足相机溯源的实时性要求,并且所提多相机指纹特征集成决策模型显著优于现有的单一模型,对于安卓手机,其视频相机溯源准确率达到98.161%,验证了该思路的可行性。     

地质矿产分析测试元数据标准研究

元数据（Metadata）是说明数据内容、质量、条件、查询和其他有关特征的背景数据,在信息共享中有重要作用.本文重点介绍了地质矿产分析测试元数据标准和元数据库管理系统的研究.     

多模态特征融合与多任务学习的特种视频分类

特种视频(本文特指暴力视频)的智能分类技术有助于实现网络信息内容安全的智能监控。针对现有特种视频多模态特征融合时未考虑语义一致性等问题,本文提出了一种基于音视频多模态特征融合与多任务学习的特种视频识别方法。首先,提取特种视频的表观信息和运动信息随时空变化的视觉语义特征及音频信息语义特征;然后,构建具有语义保持的共享特征子空间,以实现音视频多种模态特征的融合;最后,提出基于音视频特征的语义一致性度量和特种视频分类的多任务学习特种视频分类理论框架,设计了对应的损失函数,实现了端到端的特种视频智能识别。实验结果表明,本文提出的算法在Violent Flow和MediaEval VSD 2015两个数据集上平均精度分别为97.97%和39.76%,优于已有研究。结果证明了该算法的有效性,有助于提升特种视频监控的智能化水平。     

MRT letter: Visual attention driven framework for hysteroscopy video abstraction

Diagnostic hysteroscopy is a popular method for investigating the regions in the female reproductive system. The videos generated by hysteroscopy sessions of patients are recurrently archived in medical libraries. Gynecologists often need to browse these libraries in search of similar cases or for reviewing old videos of a patient. Diagnostic hysteroscopy videos contain a lot of information with abundant redundancy. Key frame extraction‐based video summarization can be used to reduce this huge amount of data. Moreover, key frames can be used for browsing and indexing of hysteroscopy videos. In this article, a domain specific visual attention driven framework for summarization of hysteroscopy videos is proposed. The visual attention model is materialized by computing saliency based on color, texture, and motion. The experimental results, in comparison with other techniques, demonstrate the efficacy of the proposed framework. Microsc. Res. Tech. 76:559–563, 2013. © 2013 Wiley Periodicals, Inc.     

结合人眼对比度敏感视觉特性的视频质量客观评价

结合人眼对亮度、色度、对比度以及运动目标的感知特性,提出了一种基于人眼对视频内容感知的视频质量客观评价方法。该方法将视频分为空域和时域信息分别描述,并利用人眼感知特性,从视频的亮度、色度、对比度以及目标运动4个方面提取特征,计算其强度。然后以人眼对比度敏感值作为强度的权重因子求和,构建人眼感知视频内容模型。最后,分别以此模型模拟人眼感知源视频和失真后的视频,计算每对应单元的所有像素之间和运动矢量之间的强度差;以强度差作为视频质量评价的分数,构建视频质量客观评价模型。采用LIVE数据库中的6个源视频和48个测试视频进行了质量评价实验,并与视频质量专家组(VQEG)推荐的5个较好的视频质量客观评价模型进行了对比分析。结果表明:提出模型的视频质量评价结果与主观评价结果之间的线性相关性系数达到0.8705,显示了较好的一致性,评价效果优于5个典型的模型。     

Analysis‐preserving video microscopy compression via correlation and mathematical morphology

The large amount video data produced by multi‐channel, high‐resolution microscopy system drives the need for a new high‐performance domain‐specific video compression technique. We describe a novel compression method for video microscopy data. The method is based on Pearson's correlation and mathematical morphology. The method makes use of the point‐spread function (PSF) in the microscopy video acquisition phase. We compare our method to other lossless compression methods and to lossy JPEG, JPEG2000, and H.264 compression for various kinds of video microscopy data including fluorescence video and brightfield video. We find that for certain data sets, the new method compresses much better than lossless compression with no impact on analysis results. It achieved a best compressed size of 0.77% of the original size, 25× smaller than the best lossless technique (which yields 20% for the same video). The compressed size scales with the video's scientific data content. Further testing showed that existing lossy algorithms greatly impacted data analysis at similar compression sizes. Microsc. Res. Tech. 78:1055–1061, 2015. © 2015 Wiley Periodicals, Inc.     

Analysis‐aware microscopy video compression

This article introduces an analysis‐aware microscopy video compression method designed for microscopy videos that are consumed by analysis algorithms rather than by the human visual system. We define the quality of a microscopy video based on the level of preservation of analysis results. We evaluated our method with a bead tracking analysis program. For the same error level in the analysis result, our method can achieve 1,000× compression on certain test microscopy videos. Compared with a previous technique that yields exactly the exact same results by analysis algorithms, our method gives more flexibility for a user to control the quality. A modification to the new method also provides faster compression speed.     

Digital image tiles: a method for the processing of large sections

Segmentation of large areas of light microscopic slides into N by N fields, and each of these fields into M digital image tiles, allows the scanning, storage and digital processing of large images. Any of the original N² fields or composites of M adjacent tiles can be recalled to the video display for analysis. Developed procedures for use on a microscope equipped with a precision scanning stage allow registration of the image coordinates (X-Y) for any original or composite field and the alignment of one of these fields along the depth (Z) axis by means of external, machined fiducial marks in serial sections. To facilitate work whenever unavoidable, we have incorporated methods for digital image panning and zooming (changes of magnification) and discuss their use and implications.     

Effect of Aloe vera application on the content and molecular arrangement of glycosaminoglycans during calcaneal tendon healing

Although several treatments for tendon lesions have been proposed, successful tendon repair remains a great challenge for orthopedics, especially considering the high incidence of re‐rupture of injured tendons. Our aim was to evaluate the pharmacological potential of Aloe vera on the content and arrangement of glycosaminoglycans (GAGs) during tendon healing, which was based on the effectiveness of A. vera on collagen organization previously observed by our group. In rats, a partial calcaneal tendon transection was performed with subsequent topical A. vera application at the injury site. The tendons were treated with A. vera ointment for 7 days and excised on the 7^th, 14^th, or 21^st day post‐surgery. Control rats received ointment without A. vera. A higher content of GAGs and a lower amount of dermatan sulfate were detected in the A. vera‐treated group on the 14^th day compared with the control. Also at 14 days post‐surgery, a lower dichroic ratio in toluidine blue stained sections was observed in A. vera‐treated tendons compared with the control. No differences were observed in the chondroitin‐6‐sulfate and TGF‐β1 levels between the groups, and higher amount of non‐collagenous proteins was detected in the A. vera‐treated group on the 21^st day, compared with the control group. No differences were observed in the number of fibroblasts, inflammatory cells and blood vessels between the groups. The application of A. vera during tendon healing modified the arrangement of GAGs and increased the content of GAGs and non‐collagenous proteins. Microsc. Res. Tech. 77:964–973, 2014. © 2014 Wiley Periodicals, Inc.     

基于时间和空间冗余的视频隐写分析方法

为了实现对视频隐写的有效检测,提出一种使用支持向量机(SVMs)的视频隐写盲检测方法.该方法利用时间和空间冗余,用帧间共谋的方式获取帧估计数据,提取视频帧的融合马尔科夫和DCT特征,构造SVMs分类器对待测视频进行检测,从而达到视频隐写检测的目的.实验结果表明,该方法能够准确地区分载密视频和原始视频.     

改进的ViBe算法及其在交通视频处理中的应用

基于ViBe算法的运动目标检测具有很高的处理效率,但在复杂背景下也存在缺陷,比如不能有效抑制运动目标的残影和鬼影区域、易受噪音干扰,在交通视频的处理中更为明显。鉴于ViBe算法的这些不足,本文对ViBe原算法提出了改进,结合像素生命长度对鬼影或残影像素进行判断,利用二次更新策略提高消除速度。根据像素值变化引入最大类间方差法,将原有的固定像素阈值变为动态阈值,以提高交通视频中车辆目标检测的抗干扰能力。实验结果表明,在3组不同交通场景视频中,改进算法能够在较少帧数内消除目标的残影或者鬼影。对结果的量化分析也证明了改进算法由于应用了动态阈值,使目标检测的精准度和整体性都有所提高。     

再制造产品数据库中对象唯一性标识方法

提出了一种运用关系型数据库的外键约束和编码系统的混合方式实现再制造数据库对象唯一性标识的方法,即从项目到零件,采用编码的形式;零件层以下,采用主键结合外键参考的外键约束方法。再制造产品由于其毛坯是废旧的机电产品,其产品信息具有不确定性的特点,为此表述再制造产品信息的信息模型是不完全的树型结构。在创建再制造产品数据库对象唯一标识的主键时,文中首先试图采用现有的外键约束方法和编码系统方法,结果表明这两种中方法都有其欠缺和不足。实践证明,该混合方式的数据库对象标识方法能较好地解决具有不完全的树型结构的数据库对象的唯一标识问题。     

Database model for hierarchical control of manufacturing cell systems in a manufacturing shop

To access a large amount of static and dynamic data sets in achieving flexible manufacturing system (FMS) control functions, a corresponding database structure must be designed to effectively support the control. Within the context of a hierarchical manufacturing control architecture, this paper discusses the development of a semantic database structure for the control needs of manufacturing cell systems in a shop. A conceptual data model is first developed using entity-relationship diagrams (ERD), and the database is then implemented from a relational data model by a database management system. An application program is used to illustrate the production control command decomposition in a manufacturing shop that consists of several manufacturing cells. Feedback of control commands execution is also discussed. It is shown that the data flows in the hierarchical manufacturing control can be effectively supported by the developed databases and query interface.     

持久对象标识的生成方法

在对象持久化过程中,利用对象标识管理器为对象生成唯一标识,并与对象关联被存储在后台关系数据库中,对象标识的引入使维护对象之间关系变得更加容易,便于对持久对象的查询.对象标识管理器的设计,主要是对对象标识生成策略的封装.分析对象标识生成的若干种方法,并对各种方法进行了分析,设计持久层时,可以根据实际需要选择合适的对象标识生成策略.     

Quantifying the growth of chlamydia suis in cell culture using high‐content microscopy

The porcine pathogen Chlamydia suis is widespread in pig farming. Isolation of Chlamydia suis in cell culture is crucial for the generation and characterization of new isolates. However, isolation of Chlamydia suis strains from field samples is fastidious. Therefore, we exploited high‐content microscopy to quantify the growth of Chlamydia suis strains in different cell lines. We found that the cell line yielding optimal propagation of Chlamydia suis differed among isolates, and we identified cell lines outperforming those routinely used for chlamydial isolation. We conclude that adaptation of the propagation procedure to the origin of the putative field isolate is highly recommended to improve the recovery rate.     

基于面向对象多媒体数据库系统的研究

在分析多媒体数据库系统的体系结构、关键技术、多媒体数据模型,功能及特点的基础上,设计了多媒体数据库系统并开发了相应的基于图形界面的管理系统。在开发系统的过程中,剖析了传统数据库系统的各种解决方案的基础上。主要从数据模型建立、物理结构设计、基于内容的检索等方面给出了较好的解决方案。     

计算机辅助选择电机系统

本软件基于CAES原理 ,利用面向对象的编程技术和数据库开发技术实现了中小型电动机的智能类型选择 ,并对Y系列 (IP4 4 )三相异步电动机以及Y系列 (IP2 3)三相异步电动机的具体技术参数和结构参数选择 ,集成为电机的计算机辅助选择系统。     

航空机械装备失效分析专家系统应用研究

介绍了应用数据库与AI逻辑推理相结合，建立一个以材料、设计、断裂分析等知识为依托的，综合典型失效案例和专家经验的失效分析专家系统。着重论述了系统的结构、功能设计和实现策略，阐明了获取和发现失效分析知识的有效方法有用于失效分析决策的不确定性推理模型，实现了相应的逻辑推理系统，并通过航空机械装备疲劳断裂失效模式应用实例，说明系统的有效性，为航空机械装备失效分析这一病态结构问题的解决，提供计算机化的方法和途径。