From the Digitization of Cultural Artifacts to the Web Publishing of Digital 3D Collections: an Automatic Pipeline for Knowledge Sharing
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Citations
A 3D approach to the archaeological study of the built remains at the Santa Cristina well sanctuary, Sardinia, Italy
Discover the Thracians – An Approach for Use of 2D and 3D Technologies for Digitization of Cultural Heritage in the Field of E-learning
A Web-based Virtual Reality Simulation of Mounting Machine
A 3D Simplification Method based on Dual Point Sampling
For Deformation Web Attacks based on Feature Recognition IPS Intrusion Prevention Technology Research
References
Some methods for classification and analysis of multivariate observations
A Combined Corner and Edge Detector
Video Google: a text retrieval approach to object matching in videos
Visual categorization with bags of keypoints
Scale & Affine Invariant Interest Point Detectors
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Frequently Asked Questions (19)
Q2. What have the authors stated for future works in "From the digitization of cultural artifacts to the web publishing of digital 3d collections: an automatic pipeline for knowledge sharing" ?
Other appealing directions of work could include the possibility to enrich the Web publishing phase, by auto- matically formatting a Web page based not only on the 3D model, but on other types of data, like text and images.
Q3. What is the way to store the geometry data?
Model data is saved under standard file formats: to store geometry information the authors use the Stanford polygon file format (PLY), which support multiple vertex attributes and binary encoding, while Portable Network Graphics (PNG) images are used for color and normal textures.
Q4. What is the correct way to describe the material properties of an object?
The most correct way to represent the material properties of an object is to describe them through a reflection function (e.g. BRDF), which attempts to model the observed scattering behavior of a class of real surfaces.
Q5. What is the effect of the projector illumination mask?
As expected, the projector illumination mask tends to increase the influence of image regions that correspond to the most illuminated surface parts, which leads to a conservation of luminosity.
Q6. Why are artifacts visible at the junctions between different images?
due to the lack of consistency from one image to another, artifacts are visible at the junctions between surface areas receiving color from different images.
Q7. How long does it take to recover the texture?
The diffuse color and detail textures recovery can take up to 5-10 minutes, while the data optimization for Web publishing is almost instantaneous.
Q8. What is the use of the interaction metaphor?
The interaction metaphor known as world-in-hand or trackball has been used to facilitate the artifact inspection by using the mouse.
Q9. How can the authors use a simple shadow mapping algorithm to estimate shadowed areas?
Since the complete geometric configura-tion of the scene is known, the authors can use a simple shadow mapping algorithm to estimate shadowed areas, to which a null weight is assigned.
Q10. How can the authors recover the occlusions of a video?
thanks to the fact that the authors know the light position for each video frame, it is possible to partially recover them by using a photometric stereo approach.
Q11. How many high quality 3D models can be made available every day?
Tens of high quality 3D models can be made available every day, for any kind of use (archival, study, presentation to the public).
Q12. What is the only light source in the scene?
During an acquisition, the only light source in the scene is the scanner projector itself, for which the position is always perfectly known.
Q13. What is the main reason for the lack of standardization of 3D content?
Beside the developers fragmentation that arises due to this wide variety of available tools and to their incompatibilities, the burden incumbent upon the user for the installation of additional software components prevented a wide adoption of online 3D content.
Q14. What other ways to make a Web page more appealing?
Other appealing directions of work could include the possibility to enrich the Web publishing phase, by auto-matically formatting a Web page based not only on the 3D model, but on other types of data, like text and images.
Q15. What is the common issue with the cited methods?
Another issue, which is common to all the cited methods, is the projection of lighting artifacts on the model, i.e. shadows, highlights, and peculiar BRDF effects, since the lighting environment is usually not known in advance.
Q16. What is the common method of avoiding lighting artifacts?
In order to correct (or to avoid to project) lighting artifacts, two possible approaches include the estimation of the lighting environment [23] or the use of easily controllable lighting setups [24].C. 3D graphics on the Web platformSince the birth of Internet, content of Web document has been characterized by several types of media, ranging from plain text to images, audio or video streams.
Q17. What is the advantage of the indexed triangle mesh?
It has the property to save a significant amount of space for the vast majority of 3D models, for which, on average, a vertex is referenced by six triangles.
Q18. What is the main advantage of the proposed approach?
Even though the proposed approach is generic enough to be used in any application for which producing and sharing digital content about real artifacts present an interest, its three main advantages (namely its ease of use, its high automation and its quickness) make it particularly appropriate to cases where huge collections have to be processed.
Q19. What is the advantage of the vertex cache?
To convey this advantage from memory occupancy to rendering performances, graphics accelerators have introduced a vertex cache capable of storing data associated to up to 32 vertices, thus allowing to reuse the results of a considerable amount of per-vertex calculations.