NDLI: Displacement Mapping as a Metric Tool for Optimizing Mesh Models Originated by 3D Digitization

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Methodological Framework for the Design and Development of Applications for Reactivation of Cultural Heritage: Case Study Cisneros Marketplace at Medellin, Colombia

Displacement Mapping as a Metric Tool for Optimizing Mesh Models Originated by 3D Digitization

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Issue 1, February 2016

Journal on Computing and Cultural Heritage (JOCCH) : Volume 8

Journal on Computing and Cultural Heritage (JOCCH) : Volume 7

Journal on Computing and Cultural Heritage (JOCCH) : Volume 6

Journal on Computing and Cultural Heritage (JOCCH) : Volume 5

Journal on Computing and Cultural Heritage (JOCCH) : Volume 4

Journal on Computing and Cultural Heritage (JOCCH) : Volume 3

Journal on Computing and Cultural Heritage (JOCCH) : Volume 2

Journal on Computing and Cultural Heritage (JOCCH) : Volume 1

Displacement Mapping as a Metric Tool for Optimizing Mesh Models Originated by 3D Digitization

Content Provider	ACM Digital Library
Author	Guidi, Gabriele Angheleddu, Davide
Copyright Year	2016
Abstract	In the past 20 years, several methods have been proposed for re-coding 3D models with a low-spatial-frequency 3D representation plus a high-frequency 2D map for recovering the details. This approach has been explored with different kinds of mapping (bump, normal, relief, parallax, displacement), which have been shown to be effective in dramatically reducing model size while still maintaining a good visual appearance. For this reason, these approaches are widely applied in those situations where the rendering time constraints are critical (e.g., real-time rendering of complex models for gaming). However, the significant difference between the original detailed 3D model and the re-coded version has made it impossible to consider the latter as a metrically satisfying substitute for the former. The purpose of this article is to propose a re-coding method based on displaced subdivision surfaces that makes it possible to adapt the re-coded 3D representation to the metrological limitations of the 3D capturing technique used for generating the original mesh. In this way, it is possible to keep the geometric incoherency between the re-coded and the acquired mesh below the threshold determined by the natural capturing technology uncertainty. The resulting re-coded model can be therefore considered as close to the physical object/scenario, as the original acquired mesh, with a great advantage in terms of 3D representation size, UV parametrization, topological coherence, and scalability. The method has been tested on three cultural heritage objects with different complexity: a damaged wooden painting by Leonardo da Vinci (a nearly 2.5D shape), a Roman stone head sculpture (full 3D shape with simple topology), and a full body bronze sculpture by Donatello (full 3D shape with complex topology), demonstrating the coherency between the re-coded models and the originals, with a model size compression depending on the topological complexity that may reach a level of better than 1:25.
Starting Page	1
Ending Page	23
Page Count	23
File Format	PDF
ISSN	15564673
e-ISSN	15564711
DOI	10.1145/2843947
Journal	Journal on Computing and Cultural Heritage (JOCCH)
Volume Number	9
Issue Number	2
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2016-05-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	3D Model compression UV parametrization Metric characterization of 3D models
Content Type	Text
Resource Type	Article
Subject	Computer Graphics and Computer-Aided Design Conservation Computer Science Applications Information Systems

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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