Browsing by Subject "digitization"

Now showing 1 - 7 of 7
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    Accuracy of 3D Reconstructed Orthodontic Models
    (2014) Stewart, Kelton; Chai, Billy; Liu, Sean; Ghoneima, Ahmed; Alford, Timothy
    Objective: To evaluate the accuracy of 3D reconstructed orthodontic models, derived by various digitization methods, as compared to conventional orthodontic plaster models. Materials and Methods: Twenty-five maxillary orthodontic plaster models were randomly selected from the Indiana University School of Dentistry Department of Orthodontics. Each plaster model was scanned with the Cadent iOC scanner and the digital data was used to print 3D reconstructed orthodontic models. The same 25 plaster models were duplicated using alginate and poured in plaster after two days. These duplicated plaster models were also scanned with the iOC scanner and 3D reconstructed. Next, the duplicate plaster models were sent to a lab, scanned with a 3Shape R700 scanner, and the digital data was 3D reconstructed. Digital calipers were used to obtain ten linear dimensional measurements on all plaster and 3D reconstructed models for comparisons. Equivalence testing was performed using 2 one-sided paired t-tests with a significance level of P <0.05. Results: Nine of the 10 linear measurements were statistically equivalent in all groups. Clinically insignificant, but statistically significant, measurement differences in maxillary central incisor height (P <0.05) were found on 3D reconstructed models derived from the 3Shape R700 desktop scanner. Conclusion: 3D reconstructed orthodontic models derived from alginate impressions, iOC scanners, and 3Shape R700 scanners are an accurate and reliable substitute for orthodontic plaster models.
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    Exploring 3D Scanning for the Creation of Digital Cultural Heritage Collections
    (2015-10-26) Schaumberg, JD; Proctor, Anna; Johnson, Jennifer
    IUPUI University Library has been digitizing and providing access to community and cultural heritage collections since 2006. Varying formats include: audio, video, photographs, slides, negatives, and text (bound, loose). The library provides access to these collections using CONTENTdm. As 3D technologies become increasingly popular in libraries and museums, IUPUI University Library is exploring the workflows and processes as they relate to 3D artifacts. The library is collaborating with Online Resources Inc., a company that specializes in 3D technology to explore new ways to deliver content to a digital audience.
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    A Framework for Text Processing and Supporting Access to Collections of Digitized Historical Newspapers
    (2007) Allen, Robert B; Copeland, Andrea J.; Achananuparp, Palakorn; Lee, Ki Jung
    Large quantities of historical newspapers are being digitized and OCRd. We describe a framework for processing the OCRd text to identify articles and extract metadata for them. We describe the article schema and provide examples of features that facilitate automatic indexing of them. For this processing, we employ lexical semantics, structural models, and community content. Furthermore, we describe visualization and summarization techniques that can be used to present the extracted events.
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    Helping People to Manage and Share Their Digital Information: A Role for Public Libraries
    (2011) Copeland, Andrea J.; Barreau, Deborah
    As a cultural institution, the public library is charged with providing resources and services that fit the needs of a particular community and, if space and budgets allow, of serving as a resource and repository of the community's past. To fulfill its mission to the public, the library must attract that public by offering materials and providing opportunities for them to pursue their unique and varied interests and discover new things. By engaging individuals in the identification and preservation of their own personal, digital objects, it may be possible to increase awareness in, and commitment to, community repositories that reflect a community's diversity and that will serve all. A user education program that focuses on the importance of identifying and preserving the information and artifacts that are important, that addresses the technical aspects of preservation, and that creates awareness of the benefits and challenges associated with sharing personal information can result in a community repository that ultimately has more value for both the individual and the community. "All lives need stories near at hand, and our experiences of narratives in contextually rich worlds are transformative." —David Carr, The Promise of Cultural Institutions, p. 57
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    A HIGH RESOLUTION 3D IMPRESSION IMAGING DEVICE
    (Office of the Vice Chancellor for Research, 2012-04-13) Zheng, Jiang Yu; Tuceryan, Mihran; Abhishek, Joshi; Egoda Gamage, Ruwan
    Introduction: The aim of this research is to develop a device which can be used to capture 3D and color images of tire track and footprint impressions in crime scenes. The device is easy to use, is non-destructive, and saves time during evidence collection. Computer-based pattern matching technology can be used to assist in matching and comparison tasks. The device will be comparable in price to the equipment currently used in the field and will produce better quality and metric data. Methods: The device for digitizing the impression evidence consists of a motorized rail with a HD video camera and two line laser lights, each with a different color. The digitization process depends on triangulation geometry of the laser stripe in the image and the camera capturing this 2D image. The system is calibrated using a vanishing point method. The system software prototype is implemented using OpenCV library and C++ language. The system is tested capturing impression scans in different materials such as mud, clay, sand, and snow. Results: Empirically, we have observed that we can resolve 0.5mm in depth values as reflected in detectable differences of at least 1 pixel in the computed disparity image. Our results also indicate that the 3D depth values produced using the 2 lasers stripes independently agree with each other over most of the pixels, confirming the accuracy of our model. In addition, the results from the two laser lights complement each other in parts of the surface where one of the laser stripes becomes invisible due to occlusions. Conclusions: Our approach of using two lasers overcomes data loss due to occlusions. We also found out that laser detection in some materials like snow is a challenging task under daylight conditions. Future research will focus on optimizing laser detection and matching 3D depth images.
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    Inclusion of 3D Artifacts into a Digital Library: Exploring Technologies and Best Practice Techniques
    (2016-11-08) Johnson, Jennifer; Proctor, Anna
    Advances in 3D technologies are providing libraries and museums the opportunity to capture 3D artifacts in digital formats. The Center for Digital Scholarship at IUPUI University Library is implementing workflows and determining best practices to incorporate 3D images into an already established digital library of community and cultural heritage collections.
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    Patents, Meet Napster: 3D Printing and the Digitization of Things
    (2013-10) Desai, Deven R.; Magliocca, Gerard N.; Robert H. McKinney School of Law
    Digitization has reached things. This shift promises to alter the business and legal landscape for a range of industries. Digitization has already disrupted copyright-based industries and laws. As cost barriers dropped, individuals engaged with copyrighted work as never before. The business-to-business models of industrial copyright faltered and in some cases failed. Industries had to reorganize, and claimed foundations for copyright had to be re-examined. This Article examines a prime example the next phase of digitization: 3D printing and it implications on intellectual property law and practice. 3D printing is a general-purpose technology that will do for physical objects what MP3 files did for music. The core patent bargain — sharing the plans on how to make something in exchange for exclusivity — may be meaningless in a world of digitized things. While these devices will unleash the creativity of producers and reduce costs for consumers, they will also make it far easier to infringe patents, copyrights, and trade dress. This will force firms to rethink their business practices and courts to reexamine not only patent doctrine but also long established doctrine in areas ranging from copyright merger to trademark post-sale confusion. Moreover, Congress will need to consider establishing some sort of infringement exemption for 3D printing in the home and expanding the notice-and takedown provisions of the Digital Millennium Copyright Act to websites that host software enabling the 3D printing of patented items and distinctive trade dress. While a 3D printer is not yet a common household item, the time to start thinking about that future is now.