Buckley, Robert. 2001. Color imaging with JPEG 2000. In IS&T SID Color Imaging Conference; 2001; 9th:113-119. Scottsdale, AZ: IS&T.
Written by a member of the JPEG2000 committee, this article provides a brief overview of the file formats, wavelet compression scheme, and features such as âRegion-of-Interestâ encoding.
Author Abstract
The JPEG 2000 image compression standard is a wavelet-based follow-on to JPEG. While it offers better compression performance, JPEG 2000 is not expected to replace JPEG. What it is expected to do is to offer new features and capabilities, so that an encoder/decoder (client/server) will have processing choices not possible with previous compression methods. This is expected to lead to unique color imaging applications for the Web, digital cameras and handheld devices. Part 1 of the JPEG 2000 standard defines the minimal decoder and was approved as an international standard in January 2001. Still in the standards pipeline are several more parts that will specify decoder extensions, file formats, conformance and reference software. This paper will give the background and an overview of JPEG 2000, demonstrate its performance and then describe its implications for color imaging.
Buckley, Rob and Franziska Frey. 2004. Preserving Images. oe Magazine 4, no 1:Â 21-24.
Available online at oemagazine.com/fromTheMagazine/jan04/image.html
Initial Article Paragraphs
Until recently, image archiving was about preserving physical media. We are able to view 17,000-year-old cave paintings and 150-year-old photographs, for example, merely through physical access. In these cases, archiving is concerned with the stability and physical preservation of the image mediaârock surfaces, photographic paper, etc. All this has changed within the last two decades in the digital world. Digital media provide access to electronic versions of images, but require a digital infrastructureâcapture systems, networks, digital media, file systems, file formats, display devices, search enginesâto connect the viewer to the original. Archiving in this case is concerned with preservation of the digital files. Part of this effort involves making sure the digital infrastructure can display the digital files. More and more, such systems will also be dealing with pictures that were created digitally, and hence do not have physical references. A digital project starts well before the scanning of the first picture or saving of the first file. Careful planning to define the aims, priorities, technical requirements, procedures, and future use is essential for efficient workflow and results that meet expectations. Digital images constitute active collections that require regular maintenance. Provisions to upgrade digital collections to keep pace with the changing computer infrastructure should be made at the start of a project, to avoid the prospect of digital collections created at considerable cost becoming inaccessible over time. A good digital archiving project is conceived as teamwork, combining expertise in imaging, collection management, information technology, conservation, descriptive methods, and preservation strategies.
Janosky, James S. and Rutherford W. Witthus.2004. Using JPEG2000 for enhanced preservation and web access of digitalarchives â a case study. In IS&T's2004 Archiving Conference:145-149. San Antonio, TX.
Using the Aware, Inc. JPEG2000Image Server as the backdrop, this article provides a review of JPEG2000standardâs file formats, encoding options, and use of metadata boxes to storetechnical metadata, TEI Lite and PDF forms of the transcription, and a short EAD finding aid. Available online at http://charlesolson.uconn.edu/Works_in_the_Collection/Melville_Project/IST_Paper3.pdf
Author Abstract
JPEG2000 standard (ISO 15444-1) provides the advantages of advanced wavelet compression to digital archiveswhile eliminating the concerns associated with proprietary compression and fileformats. JPEG2000 allows archivists to preserve culturally significant digitalobjects using lossless compression while making the collection more accessibleto a wider audience. From a singlemaster JPEG2000 image, one can extract a highly compressed image fortransmission and display it in a web browser. The layered file format supportsextracting any desired image size or quality. Tiling, Progressive Display, andClient- Side Region of Interest can be combined to provide for effectiveviewing of archive- quality files over a limited bandwidth. Compliance with anISO standard and embedded support for multiple types of metadata each helpensure that the archive content outlives the systems that created it. Using Charles Olson's Melville Project at theUniversity of Connecticut as a case study, this paper demonstrates thecapabilities of a JPEG2000 Image Server and discusses how the JP2 and JPX filescan be used to support multiple types of metadata for such archives.