Joint object reference digital interferometer (JORDI) is a recently developed system capable of recording holograms of various types [Opt. Lett. 38(22), 4719 (2013)]. Presented here is a new enhanced system design that is based on the previous JORDI. While the previous JORDI has been based purely on diffractive optical elements, displayed on spatial light modulators, the present design incorpor...

Objectives: Several methods of image acquisition are accessible in dentistry. There is no overall acceptable method for image digitization so all different types of images can be comparable. The objective of this study was to compare the diagnostic accuracy of different methods of image digitization. Methods: This accuracy diagnostic test study used perceptibility curve test which first intr...

Purpose – This paper aims to provide an overview of the issues related to developing a digital repository for learning objects. Given the unique nature of digital learning objects, compared to other types of digital materials, several factors must be considered when establishing a learning object repository. Design/methodology/approach – The conclusions of the paper are drawn from a review of t...

this study is a contribution to assess the high resolution digital aerial imagery for semi-automatic analysis of tree species identification. to maximize the benefit of such data, the object-based classification was conducted in a mixed forest plantation. two subsets of an ultracam d image were geometrically corrected using aero-triangulation method. some appropriate transformations were perfor...

In this paper is presented the semantic model defined for descriptive metadata of resources, managed by the Sapienza Digital Library. The semantic model is derived from the Metadata Object Descriptive Schema, a digital library descriptive standard, for library applications. The semantic model can be used as top level conceptual reference model, in order to support the implementation of semantic...

This research investigated the informal use of two children’s digital reference services that were used for purposes unintended by the designers. The motivation for this research was to explore the ways that children bend to their own informal uses the formal tools designed to support their education. Research questions included, How and with what frequency do children use digital reference ser...

The quality of images computed from digital holograms or heterodyne array imaging is degraded by phase errors in the object and/or reference beams at the time of measurement. This paper describes computer simulations used to compare the performance of digital shearing laser interferometry and various sharpness metrics for the correction of such phase errors when imaging a diffuse object. These ...