This article presents the evaluation of a pipeline to develop a high-quality texture mapping implementation which makes it possible to carry out a semantic high-quality 3d textured model. due to geometric errors such ...
详细信息
This article presents the evaluation of a pipeline to develop a high-quality texture mapping implementation which makes it possible to carry out a semantic high-quality 3d textured model. due to geometric errors such as camera parameters or limited image resolution or varying environmental parameters, the calculation of a surface texture from 2d images could present several color errors. And, sometimes, it needs adjustments to the RGB or lightness information on a defined part of the texture. The texture mapping procedure is composed of mesh parameterization, mesh partitioning, mesh segmentation unwraps, UV map and projection of island, UV layout optimization, mesh packing and mesh baking. The study focuses attention to the mesh partitioning that essentially assigns a weight to each mesh, which reveals a mesh's weight calculated by considering the flatness anddistance of the mesh with respect to a chart. The 3d texture mapping has been developed in Blender and implemented in Python. In this paper we present a flowchart that resumes the procedure which aims to achieve a high-quality mesh and texture 3d model starting from the 3d Spider acquire, integrated with the SfM texture and using the texture mapping to reduce the color errors according to a semantic interpretation.
In mixed reality (MR), augmenting virtual objects consistently with real-world illumination is one of the key factors that provide a realistic and immersive user experience. For this purpose, we propose a novel deep l...
详细信息
In mixed reality (MR), augmenting virtual objects consistently with real-world illumination is one of the key factors that provide a realistic and immersive user experience. For this purpose, we propose a novel deep learning-based method to estimate high dynamic range (HdR) illumination from a single RGB image of a reference object. To obtain illumination of a current scene, previous approaches inserted a special camera in that scene, which may interfere with user's immersion, or they analyzed reflected radiances from a passive light probe with a specific type of materials or a known shape. The proposed methoddoes not require any additional gadgets or strong prior cues, and aims to predict illumination from a single image of an observed object with a wide range of homogeneous materials and shapes. To effectively solve this ill-posed inverse rendering problem, three sequential deep neural networks are employed based on a physically-inspireddesign. These networks perform end-to-end regression to gradually decrease dependency on the material and shape. To cover various conditions, the proposed networks are trained on a large synthetic dataset generated by physically-based rendering. Finally, the reconstructed HdR illumination enables realistic image-based lighting of virtual objects in MR. Experimental results demonstrate the effectiveness of this approach compared against state-of-the-art methods. The paper also suggests some interesting MR applications in indoor and outdoor scenes.
The PERVIVAL project aims at developing an interactive system with the preliminary function of explaining a complex museum collection in a simple and immediate way and allowing the visitor to better understand the mus...
详细信息
The PERVIVAL project aims at developing an interactive system with the preliminary function of explaining a complex museum collection in a simple and immediate way and allowing the visitor to better understand the museum collection he is about to see. In particular, the interactive system aims at enhancing the understanding of the collections of funeral furnishings of Egyptians, which are characterized by a multiplicity of objects of rich symbolism and connected to each other through complex funeral rituals. The idea is to explain the religious creed of ancient Egyptians through the objects placed in the tomb, having in this way a double benefit: enlightening the rituals and placing the objects back in their primary function. In this way, the knowledge of the visitor is not only enlarged through the description of something that is described on papyruses or inscriptions (hence, not comprehensible) but also the proper function of every single object will be explained through the connection among them, as a function of amulets or goods necessary to travel through the World of the dead. The connection between the different objects allows a much greater understanding of the exposed collection that would be perceived in this way not as a set of single isolated pieces, but as a harmonious set of complementary elements between they represent a specific historical-cultural context.
The paper aims to emphasise the positive contribution that the 3d laser scanning anddigital photogrammetry survey, integrated with diagnostic analysis techniques, can make in the field of construction engineering. Th...
详细信息
The paper aims to emphasise the positive contribution that the 3d laser scanning anddigital photogrammetry survey, integrated with diagnostic analysis techniques, can make in the field of construction engineering. The case study of the former kindergarten San Filippo Neri in dalmine intends to contribute to the development of methodologies and operational tools related to the knowledge and conservation of modern and contemporary heritage. After archival research aimed at retracing the building's technical-constructive evolution, the study was extended out through the metric and morphological survey of both its external walls and internal spaces, paying special attention to the analysis of the deformations of the large horizontal surfaces, such as floors and ceilings. diagnostic investigations - thermographic and microclimatic - have completed the survey campaign, so allowed to read both the envelope and the substance of the building, and to identify the critical issues. This work adopts and shows the correct glide slope to succeed in an adaptive reuse project in which the design stage can result solely from the in-depth study of the building.
In this paper, we describe a presentation room created in a three-dimensional model of the first National Theater of Hungary anddeveloped in the virtual reality engine MaxWhere.
ISBN:
(纸本)9781728182131
In this paper, we describe a presentation room created in a three-dimensional model of the first National Theater of Hungary anddeveloped in the virtual reality engine MaxWhere.
The site of Avella is a precious example of ruined medieval fortification with territorial and landscape values. The width and vulnerability of its masonry remnants require a systematic survey and physical investigati...
详细信息
The site of Avella is a precious example of ruined medieval fortification with territorial and landscape values. The width and vulnerability of its masonry remnants require a systematic survey and physical investigation, necessary to any preservation and enhancement strategy planning, so far, not yet extended to the fronts of the fortress and the two walled lines. The understanding of the process, scientifically based, which over time has led the buildings to the present state of fragmentation has the same need. Obtain with expedited methods and customary instruments a photogrammetrically controlled survey, the stratigraphic study of the castle elevations and the processing of a photo-based3d model is therefore the aim of the paper. Carried out on an interdisciplinary basis, it comes from the extension of the outcomes of a didactic workshop in master's degree courses in Architectural Survey and Restoration design, held in 2018. The surveying procedure with the drone proved to be the most suitable, also for the possibility of an expeditious and cheaper measurement phase compared to other surveying methods. The results comprise the fortress georeferenced ortho-photomosaic and its photo-based3d model, then exported both as a point cloud and a 3d mesh. The workshop also implemented topography and terrestrial photogrammetry procedures, such as to be compared with the previous one.
"A picture is worth a thousand words": a famous quote about knowledge dissemination but also literally true. The documentation of cultural heritage (CH) monuments is carried out by measurements and photos an...
详细信息
"A picture is worth a thousand words": a famous quote about knowledge dissemination but also literally true. The documentation of cultural heritage (CH) monuments is carried out by measurements and photos and stored in 3d models - not by textual information alone. So what could be a more straightforward way to inform the public about CH than visual information? This approach can be extended not only by providing static images or videos from predefined angles but by giving the user the opportunity to interactively explore the virtual representation and interact with the scene. Recent advances in contemporary virtual Reality (VR) have made it available to more people as prices have dropped. New devices have entered the market so that VR is not limited to VR labs, but is available even at home. With modern head-mounteddisplays the user can immerse himself in the virtual CH monument to explore and interact with it. Game engines offer tools for rapiddevelopment of interactions and help to produce visually appealing worlds. In this paper is presented the generation of a virtual3d model of Rumeli Hisari, an Ottoman fortress at the Bosporus in Istanbul, Turkey (Fig. 1) and its processing for data integration into the game engine Unity. The project has been carried out as a co-operation between BIMTAS, a company of the Greater Municipality of Istanbul, Turkey and the Photogrammetry & Laser Scanning Lab of the HafenCity University Hamburg, Germany with the aim of a VR application for an immersive and interactive visualisation of the fortress using the VR system HTC Vive. The workflow from data acquisition to VR visualisation, including the necessary programming for navigation, is described. Furthermore, the possible use (including simultaneous multiple users environments) of such a VR visualisation for a CH monument is discussed.
We propose a novel joint framework for 3d face reconstruction (3dFR) that integrates facial attribute estimation (FAE) as an auxiliary task. One of the essential problems of 3dFR is to extract semantic facial features...
详细信息
despite photogrammetry has been longly used for 3d model production, the recent development of structure from motion basedreconstructions and the spread of unmanned aerial vehicles (UAV) are increasing its usage even...
详细信息
despite photogrammetry has been longly used for 3d model production, the recent development of structure from motion basedreconstructions and the spread of unmanned aerial vehicles (UAV) are increasing its usage even further. Actually, the combined use of nadir and oblique UAV photogrammetry allows to cross the bridge between close range and aerial photogrammetry, enabling the quick acquisition of images for detailed3d model production. This paper assesses the accuracy of UAV photogrammetry in the reconstruction of a cultural heritage building, namely the Girifalco fortress (Cortona, Italy), and it evaluates advantages and issues of this kind of 3d model generation. Furthermore, this work aims also at investigating the possible use of the generated model in order to extract geometric information about the building. First, elementary geometric shapes are extracted from the photogrammetric point cloud: the results of this step can be exploited for enabling the automatic generation of compact models of the building, which can be useful for instance in 3d city modeling applications. Then, a proper analysis of the geometric information included in the extracted shapes can be used in order to extract semantic information (e.g. to classify windows anddoors) and to detect damaged areas on the building walls.
Technology development really reaches its highest point when it becomes a tool to facilitate life to people, especially to those more disadvantaged groups. This is the case of people with disabilities, who find lots o...
详细信息
Technology development really reaches its highest point when it becomes a tool to facilitate life to people, especially to those more disadvantaged groups. This is the case of people with disabilities, who find lots of barriers to cope with the most usual and simplest things in their day-to-day. This fact is even more significant when they happen to face heritage buildings or environments. For instance, blind people or people with reduced mobility too often come upon architectural barriers that stop them from enjoying sites and monuments. Focused on people that have to use wheelchairs, a VR experience have been developed in order to provide them with the most realistic sensations while virtually touring on their wheelchairs some archaeological sites. This paper presents the steps forder the users to have the same sensations as if they were wheeling on the floor while visiting the site: irregularities, slopes and narrowness. The VR application has been developed to traverse one of the most monumental buildings of the whole Spanish Protohistory, the site of Cancho Roano (Zalamea de la Serena, Spain). The procedure to generate its digital 3d model from real data acquired with a laser scanner is also dealt with in it.
暂无评论