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Aging Prediction of Cultural Heritage Samples Based on Surface Microgeometry 基于表面微观几何的文物样本老化预测
Pub Date : 1900-01-01 DOI: 10.2312/gch.20181352
I. Ciortan, G. Marchioro, C. Daffara, R. Pintus, E. Gobbetti, Andrea Giachetti
A critical and challenging aspect for the study of Cultural Heritage (CH) assets is related to the characterization of the materials that compose them and to the variation of these materials with time. In this paper, we exploit a realistic dataset of artificially aged metallic samples treated with different coatings commonly used for artworks’ protection in order to evaluate different approaches to extract material features from high-resolution depth maps. In particular, we estimated, on microprofilometric surface acquisitions of the samples, performed at different aging steps, standard roughness descriptors used in materials science as well as classical and recent image texture descriptors. We analyzed the ability of the features to discriminate different aging steps and performed supervised classification tests showing the feasibility of a texture-based aging analysis and the effectiveness of coatings in reducing the surfaces’ change with time. CCS Concepts •Computing methodologies → Machine learning approaches; Neural networks; •Applied computing → Arts and humanities; •General and reference → Metrics;
文化遗产(CH)资产研究的一个关键和具有挑战性的方面与构成它们的材料的特征以及这些材料随时间的变化有关。在本文中,我们利用人工老化金属样品的真实数据集,这些金属样品经过不同的涂层处理,通常用于艺术品的保护,以评估从高分辨率深度图中提取材料特征的不同方法。特别是,我们估计了在不同老化步骤下样品的微轮廓表面采集,材料科学中使用的标准粗糙度描述符以及经典和最新的图像纹理描述符。我们分析了特征区分不同老化步骤的能力,并进行了监督分类测试,证明了基于纹理的老化分析的可行性,以及涂层在减少表面随时间变化方面的有效性。•计算方法→机器学习方法;神经网络;•应用计算机→艺术与人文;•一般和参考→指标;
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引用次数: 1
Crack Detection in Single- and Multi-Light Images of Painted Surfaces using Convolutional Neural Networks 基于卷积神经网络的油漆表面单光和多光图像的裂纹检测
Pub Date : 1900-01-01 DOI: 10.2312/GCH.20191347
T. Dulecha, Andrea Giachetti, R. Pintus, I. Ciortan, A. Villanueva, E. Gobbetti
Cracks represent an imminent danger for painted surfaces that needs to be alerted before degenerating into more severe aging effects, such as color loss. Automatic detection of cracks from painted surfaces’ images would be therefore extremely useful for art conservators; however, classical image processing solutions are not effective to detect them, distinguish them from other lines or surface characteristics. A possible solution to improve the quality of crack detection exploits Multi-Light Image Collections (MLIC), that are often acquired in the Cultural Heritage domain thanks to the diffusion of the Reflectance Transformation Imaging (RTI) technique, allowing a low cost and rich digitization of artworks’ surfaces. In this paper, we propose a pipeline for the detection of crack on egg-tempera paintings from multi-light image acquisitions and that can be used as well on single images. The method is based on single or multi-light edge detection and on a custom Convolutional Neural Network able to classify image patches around edge points as crack or non-crack, trained on RTI data. The pipeline is able to classify regions with cracks with good accuracy when applied on MLIC. Used on single images, it can give still reasonable results. The analysis of the performances for different lighting directions also reveals optimal lighting directions. CCS Concepts • Computing methodologies → Supervised learning by classification; Cross-validation; • Applied computing → Fine arts;
裂缝对油漆表面来说是迫在眉睫的危险,需要在退化成更严重的老化效应(如变色)之前警惕。因此,从绘画表面图像中自动检测裂缝对艺术品保护人员非常有用;然而,传统的图像处理方法无法有效地检测出它们,并将它们与其他线条或表面特征区分开来。提高裂纹检测质量的一个可能的解决方案是利用多光图像集(MLIC),由于反射变换成像(RTI)技术的普及,这些图像集通常在文化遗产领域获得,从而实现艺术品表面的低成本和丰富的数字化。在本文中,我们提出了一个从多光图像中检测蛋彩画裂纹的管道,该管道也可以用于单个图像。该方法基于单光或多光边缘检测和自定义卷积神经网络,该网络能够将边缘点周围的图像斑块分类为裂纹或非裂纹,并在RTI数据上进行训练。将该方法应用于MLIC上,可以很好地对裂纹区域进行分类。在单个图像上使用,它仍然可以给出合理的结果。通过对不同照明方向的性能分析,得出了最佳照明方向。•计算方法→分类监督学习;交叉验证;•应用计算机→美术;
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引用次数: 5
Augmenting Local and Remote Cultural Visits with Mixed Reality 用混合现实增强本地和远程文化访问
Pub Date : 1900-01-01 DOI: 10.2312/gch.20231170
Pedro Lourenço, Nuno Correia, Armanda Rodrigues
With the rapid evolution of technology in the last decades came the possibility of executing certain activities remotely. Museum and gallery visits can greatly benefit from remote interaction and can be enhanced by visitor participation and collaboration. The pandemic setting contributed to the active search for its implementation in several areas of society. The framework presented in this paper aims to tackle both of the aforementioned opportunities instantiated by companion and collaborative virtual and augmented reality applications. The first application was built for Oculus Quest devices and serves as a means to immerse the user and provide a sense of presence in remote visits. The second is a smartphone application meant to augment the onsite visitor experience with digital information and the possibility for commenting and annotating the visit. The latter application can also stream a camera perspective to the virtual environment accessible in the first application, enabling a sense of participation and presence in the physical exhibit, to the to the virtual visitor . The system’s usability and presence were evaluated in a series of questionnaires performed by a variety of participants.
随着过去几十年技术的快速发展,远程执行某些活动成为可能。博物馆和画廊的参观可以大大受益于远程互动,并可以通过游客的参与和协作来增强。大流行病的背景促使积极寻求在社会的几个领域实施该公约。本文提出的框架旨在解决上述由同伴和协作虚拟和增强现实应用实例化的机会。第一个应用程序是为Oculus Quest设备构建的,作为一种让用户沉浸其中的手段,并在远程访问中提供一种存在感。第二个是一个智能手机应用程序,旨在通过数字信息和评论和注释访问的可能性来增强现场访问者的体验。后一种应用程序还可以将相机视角流式传输到第一个应用程序中可访问的虚拟环境中,从而为虚拟访问者提供参与物理展览的感觉和存在感。该系统的可用性和存在性通过一系列由不同参与者执行的问卷进行评估。
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引用次数: 0
Towards Semi-Automatic Scaling Detection on Flat Stones 平板石材的半自动结垢检测
Pub Date : 1900-01-01 DOI: 10.2312/gch.20171291
Imanol Muñoz-Pandiella, K. Akoglu, C. Bosch, H. Rushmeier
In Cultural Heritage projects, it is very important to identify and track weathering effects on monuments in order to design and test conservation strategies. Currently, this mapping is manual work performed by experts based on what they observe and their experience. In this paper, we present a workflow to map the weathering effect known as scaling on monuments with very little user interaction. First, we generate a 3D model of the monuments using photogrammetry techniques. Then, we reduce the noise in the acquired data using an adaptive and anisotropic filter. After that, we estimate the original shape of the surface before the weathering effects using the RANSAC algorithm. With this information, we perform a geometrical analysis to detect the features affected by this weathering effect and compute their characteristics. Then, we map the regions that have suffered scaling using the detected features and a segmentation based on the distance between the mesh and the unweathered surface. Our technique results can be very useful to understand the level of weathering of a monument and to trace the weathered parts through time automatically.
在文化遗产项目中,为了设计和测试保护策略,识别和跟踪风化对古迹的影响非常重要。目前,这种映射是由专家根据他们的观察和经验进行的手工工作。在本文中,我们提出了一个工作流来映射风化效应,即在很少的用户交互下对纪念碑进行缩放。首先,我们使用摄影测量技术生成纪念碑的3D模型。然后,我们使用自适应和各向异性滤波器来降低采集数据中的噪声。在此基础上,利用RANSAC算法对风化前表面的原始形状进行估计。利用这些信息,我们进行几何分析来检测受这种风化效应影响的特征,并计算它们的特征。然后,我们使用检测到的特征和基于网格与未风化表面之间距离的分割来映射遭受缩放的区域。我们的技术结果可以非常有用的了解一个纪念碑的风化程度,并自动跟踪风化部分的时间。
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引用次数: 2
Immersive Geometry-based and Image-based Exploration of Cultural Heritage Models 基于沉浸式几何和图像的文化遗产模型探索
Pub Date : 1900-01-01 DOI: 10.2312/GCH.20211402
A. Farràs, Marc Comino, C. Andújar
Recent advances in 3D acquisition technologies have facilitated the inexpensive digitization of cultural heritage. In addition to the 3D digital model, in many cases multiple photo collections are also available. These photo collections often provide valuable information not included in the 3D digital model. In this paper we describe a VR-ready web application to simultaneously explore a cultural heritage model together with arbitrary photo collections. At any time, users can define a region of interest either explicitly or implicitly, and the application retrieves, scores, groups and shows a matching subset of the photos. Users can then select a photo to project it onto the 3D model, to inspect the photo separately, or to teleport to the position the photo was taken from. Unlike previous approaches for joint 2D-3D model exploration, our interface has been specifically adapted to VR. We conducted a user study and found that the application greatly facilitates navigation and provides a fast, intuitive access to the available photos. The application supports any modern browser running on desktop, mobile and VR headset systems.
最近3D采集技术的进步促进了文化遗产的低成本数字化。除了3D数字模型之外,在许多情况下,还可以使用多个照片集。这些照片集通常提供了3D数字模型中没有的有价值的信息。在本文中,我们描述了一个vr就绪的web应用程序,可以同时探索文化遗产模型和任意图片集。在任何时候,用户都可以显式或隐式地定义感兴趣的区域,应用程序会检索、评分、分组并显示匹配的照片子集。然后,用户可以选择一张照片投射到3D模型上,单独查看照片,或者传送到拍摄照片的位置。与之前的联合2D-3D模型探索方法不同,我们的界面专门针对VR进行了调整。我们进行了一项用户研究,发现该应用程序极大地方便了导航,并提供了对可用照片的快速、直观的访问。该应用程序支持在桌面,移动和VR耳机系统上运行的任何现代浏览器。
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引用次数: 1
A Digital Data Curation-Based Photogrammetric Acquisition Methodology for Cultural Heritage, expanded with CIDOC CRM Compatibility: protocol BeA-PG 基于数字数据策展的文化遗产摄影测量采集方法,扩展了CIDOC CRM兼容性:协议BeA-PG
Pub Date : 1900-01-01 DOI: 10.2312/gch.20231169
Vittorio Lauro, Vincenzo Lombardo
The increasing digitalization of cultural heritage assets and the exponential expansion of digital repositories have created new opportunities for archaeological documenting, preservation, and dissemination. Photogrammetry, a survey approach that uses photographic acquisitions to construct highly detailed 3D models of objects, buildings, and landscapes, is one of the most promising techniques in this field. The effectiveness of the photogrammetric process, however, has still limitations due to a lack of experience sharing and data interoperability, which have resulted from the singularities of the techniques in both process and data format. To address this issue, this paper proposes a novel workflow for the photogrammetric process, called BeA-PG, developed for the BeArchaeo archaeological project. BeA-PG implements two relevant features for improving the effectiveness: on the one hand, sharing is improved by widening the scope of the process representation from the specific archaeological context to the broader cultural heritage context, by adopting the Digital Data Curation process abstraction; on the other, it improves the interoperability by describing the process with a shared ontological vocabulary, namely the CIDOC-CRM model. The paper introduces the major features of the photogrammetric process, its description through the abstract flow of the Digital Data Curation process, and its encoding through the CIDOC-CRM vocabulary. We illustrate the BeA-PG workflow and its experimental application in the practical setting of the BeArchaeo project.
文化遗产资产的日益数字化和数字资源库的指数级扩展为考古记录、保存和传播创造了新的机会。摄影测量是一种测量方法,它使用照片来构建物体、建筑物和景观的高度详细的3D模型,是该领域最有前途的技术之一。然而,由于缺乏经验共享和数据互操作性,摄影测量过程的有效性仍然受到限制,这是由于技术在过程和数据格式上的独特性造成的。为了解决这个问题,本文提出了一种新的摄影测量流程,称为BeA-PG,为BeArchaeo考古项目开发。BeA-PG实现了提高有效性的两个相关特征:一方面,通过采用数字数据策展过程抽象,将过程表征的范围从具体的考古语境扩大到更广泛的文化遗产语境,从而提高了共享;另一方面,它通过使用共享的本体词汇表(即CIDOC-CRM模型)来描述过程,从而提高了互操作性。本文介绍了摄影测量过程的主要特点,通过数字数据管理过程的抽象流程对其进行描述,并通过CIDOC-CRM词汇对其进行编码。我们举例说明了BeA-PG工作流程及其在BeArchaeo项目实际设置中的实验应用。
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引用次数: 0
Visual Computing for Archaeological Artifacts with Integral Invariant Filters in 3D 基于积分不变滤波器的考古文物三维视觉计算
Pub Date : 1900-01-01 DOI: 10.2312/gch.20171290
H. Mara, S. Krömker
3D-artifacts from ancient civilizations contain many different kinds of information in form of forensic trace evidence, e.g., tool marks from styli or fingerprints on wax sealings. These very fine structures are increasingly captured by various 3D-acquisiton techniques and stored as irregular meshes. We introduce filter algorithms for the processing of these datasets to finally extract meaningful information at predefined scales. Therefore, Multiscale-Integral Invariants (MSII) are introduced as robust filter methods with their four different variants, using volume, patch, surface and line integrals for their specific sensitivity on mean curvature, Gaussian curvature or noise detection. Smoothing as known from 2D-raster image processing cannot be applied directly. It needs adaptation to the irregular structure of the triangular grids describing 2D-manifolds in 3D-space. We introduce a fast 1-ring smoothing with a skillful weighting by distance and area of the neighboring points and triangles. Finally, we apply our technique to the various motivating examples for showing the results as false color images with isolines, indicating the respective field of function values, e.g., curvature in various norms or correlations in the feature space. Smooth isolines are indicators for the successful removal of noise. We finally compare the fully automated results with a manual graphic rendering of a faded handwriting found in the tomb of the empress Gisela of Swabia. CCS Concepts •Computing methodologies → Computer graphics; •Applied computing → Fine arts;
来自古代文明的3d文物以法医痕迹证据的形式包含了许多不同种类的信息,例如,来自风格或蜡封上的指纹的工具标记。这些非常精细的结构越来越多地被各种3d采集技术捕获,并以不规则网格的形式存储。我们引入过滤算法来处理这些数据集,最终在预定义的尺度上提取有意义的信息。因此,多尺度积分不变量(Multiscale-Integral Invariants, MSII)作为具有四种不同变体的鲁棒滤波方法被引入,利用体积积分、斑块积分、曲面积分和线积分对平均曲率、高斯曲率或噪声检测的特定灵敏度。2d光栅图像处理中的平滑不能直接应用。它需要适应三维空间中描述二维流形的三角形网格的不规则结构。我们引入了一种快速的1环平滑算法,该算法通过对相邻点和三角形的距离和面积进行巧妙的加权。最后,我们将我们的技术应用于各种激励示例,将结果显示为具有等值线的假彩色图像,表明函数值的各自领域,例如,各种规范的曲率或特征空间中的相关性。平滑等值线是成功去除噪声的指标。最后,我们将完全自动化的结果与在施瓦本的吉塞拉皇后墓中发现的褪色笔迹的手工图形渲染进行比较。•计算方法→计算机图形学;•应用计算机→美术;
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引用次数: 7
CHER-ish: A Sketch- and Image-based System for 3D Representation and Documentation of Cultural Heritage Sites CHER-ish:一个基于草图和图像的文化遗址三维呈现和记录系统
Pub Date : 1900-01-01 DOI: 10.2312/gch.20171314
Victoria Rudakova, N. Lin, Natallia Trayan, T. M. Sezgin, Julie Dorsey, H. Rushmeier
We present a work-in-progress report on a sketchand image-based software called “CHER-ish” designed to help make sense of the cultural heritage data associated with sites within 3D space. The software is based on the previous work done in the domain of 3D sketching for conceptual architectural design, i.e., the system which allows user to visualize urban structures by a set of strokes located in virtual planes in 3D space. In order to interpret and infer the structure of a given cultural heritage site, we use a mix of data such as site photographs and floor plans, and then we allow user to manually locate the available photographs and their corresponding camera positions within 3D space. With the photographs’ camera positions placed in 3D, the user defines a scene’s 3D structure by the means of stokes and other simple 2D geometric entities. We introduce the main system components: virtual planes (canvases), 2D entities (strokes, line segments, photos, polygons) and provide a description of the methods that allow the user to interact with them within the system to create a scene representation. Finally, we demonstrate the usage of the system on two different data sets: a collection of photographs and drawings from Dura-Europos, and drawings and plans from Horace Walpole’s Strawberry Hill villa. CCS Concepts •Human-centered computing → Scientific visualization; Information visualization; •Applied computing → Archaeology; Computer-aided design;
我们提出了一份关于基于草图和图像的软件的工作进展报告,该软件被称为“CHER-ish”,旨在帮助理解与3D空间中遗址相关的文化遗产数据。该软件是基于之前在概念建筑设计的3D草图领域所做的工作,即该系统允许用户通过位于3D空间虚拟平面中的一组笔画来可视化城市结构。为了解释和推断给定文化遗址的结构,我们使用了场地照片和平面图等混合数据,然后我们允许用户手动定位可用的照片及其在3D空间中相应的相机位置。将照片的相机位置放置在3D中,用户通过stokes和其他简单的2D几何实体来定义场景的3D结构。我们介绍了主要的系统组件:虚拟平面(画布)、2D实体(笔画、线段、照片、多边形),并提供了允许用户在系统内与它们交互以创建场景表示的方法描述。最后,我们演示了该系统在两个不同数据集上的使用:来自Dura-Europos的照片和图纸集合,以及来自Horace Walpole的草莓山别墅的图纸和平面图。•以人为本的计算→科学可视化;信息可视化;•应用计算→考古学;计算机辅助设计;
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引用次数: 5
DataSpace-ISPC: a Semantic Platform for Heritage Science 数据空间- ispc:遗产科学的语义平台
Pub Date : 1900-01-01 DOI: 10.2312/gch.20231166
Alberto Bucciero, Alessandra Chirivi, Gerardo Anglada, E. Demetrescu, B. Fanini, Nicolò Paraciani
The contribution presents the DataSpace of the Institute of Heritage Science (ISPC) of the Italian National Council for Research. Cultural Heritage is well known to be a multidisciplinary domain where heterogeneous data, methods and techniques overlap, co-exist and collaborate to create evidence-based wisdom represented with local and (rarely) inter-operable standards. DataSpace aims to overcome the need to harmonise converging research perspectives, allow collaborative research, and de-babelize the presentation of data. This horizontal perspective is based on a graph of knowledge, ruled by a semantic reference model, and acts as a glue to connect different digital resources created with different perspectives. The DataSpace, which is built on top of the Arches platform integrated and customised with original tools, has been validated with positive results against two case studies to cover the wider domain of Heritage Science. The contribution explains the activities and technological solutions adopted and goes into detail about the problems and limitations that arose with the implementation of the DataSpace offering a critical yet positive perspective on the use of the DataSpace-ISPC in production scenarios.
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引用次数: 0
Multisensory Virtual Experience of Tanning in Medieval Coventry 中世纪考文垂制革的多感官虚拟体验
Pub Date : 1900-01-01 DOI: 10.2312/gch.20171297
Yuanfa Dong, Mark Webb, Carlo Harvey, K. Debattista, A. Chalmers
In the medieval period, Coventry, in the English Midlands was a major centre for tanning as well as for its better-known cloth industry. Heavily damaged during the Second World War, and unsympathetically rebuilt in the 1950s and 1960s, there is little left in modern Coventry to remind visitors of this important period in Coventry’s history. The tanning of cattle hides was a labour intensive and smelly process. After the hooves and horns had been chopped off the animal skins from butchers, the skins were immersed in pits filled with dog dung or lime, scraped and then sprinkled with urine and left to rot in a warm environment. Finally the hides were soaked for up to twelve months in a tanning liquid to achieve the desired quality of leather. To fully appreciate the medieval tanning process, any virtual recreation needs to be multisensory: the sites of the skins in various stages of processing, the shouts of the workers, and the pungent smells. This paper presents the process of recreating this important multisensory experience and discusses how this can provide visitors with a richer experience of Coventry’s illustrious past. CCS Concepts •Computing methodologies → Virtual reality; Ray tracing; Perception; •Applied computing → Architecture (buildings);
在中世纪时期,英国中部的考文垂是制革的主要中心,也是著名的布业中心。考文垂在第二次世界大战期间遭到严重破坏,在20世纪50年代和60年代进行了无情的重建,现代考文垂几乎没有留下什么东西来提醒游客考文垂历史上这一重要时期。制革牛皮是一个劳动密集型的过程,而且气味难闻。蹄和角从肉铺上切下来后,把兽皮浸入装满狗粪或石灰的坑里,刮干净,然后撒上尿液,放在温暖的环境中腐烂。最后,皮革在制革液中浸泡长达12个月,以达到所需的皮革质量。为了充分欣赏中世纪的制革过程,任何虚拟娱乐都需要具有多重感官:在不同的加工阶段,皮革的位置,工人的呼喊,以及刺鼻的气味。本文介绍了重建这一重要的多感官体验的过程,并讨论了如何为游客提供更丰富的考文垂辉煌过去的体验。•计算方法→虚拟现实;射线追踪;知觉;•应用计算→建筑学(建筑);
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引用次数: 14
期刊
Eurographics Workshop on Graphics and Cultural Heritage
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