Message-Id: <mailto:199603032220.QAA21521@library.wustl.edu> Date: Mon, 4 Mar 1996 09:06:21 +1100 From: "mailto:Iris.Radulescu@Lib.Monash" <Iris.Radulescu@LIB.MONASH.EDU.AU> Subject: Retrying to post: Conceptual imaging problems need solution To: Multiple recipients of list IMAGELIB
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Subject: Databases for multi-image documents Robert Rosenberg
We have an item-level database for some 80,000 documents. We are going to link that database to images (8-bit grayscale, for the most part) of the documents. IR: Have you already investigated the image format? If so, what IR: format have you chosen?
Many of the documents are multi-page; IR: In paper form, I assume - or on microfilm. Or are they scanned / digitised already? The type of document is important. Are these mostly text, or mostly pictures? If pictures, are these drawings, or photographs? The reason why these questions are important is that, in my experience, for images of pages of mainly text you cannot beat TIFF Group 4 compres sed as storage format. It also supports multipage files, i.e. you can have up to 100 A4 pages in one disk file without affecting speed of decompression too much. (Otherwise, the limit may be much more than 100, but moving from page to page will incurr some overheads). All you need then is an image viewer that can display this format.
Have a look at www-berwick.lib.monash.edu.au for an example of this sort of files. Follow the link to "Imaging Tools" for a viewer with TIFF G4 capability (Intel platform - works under Windows 3.11 and Windows 95, but for the latter you can get Microsoft's own Imaging free add-on to Win95 by Wang).
Do a search on the Library's catalogue with Reserve as search type, and LAW0000 as the search parameter (a fake course code). The retrieved detail record will have a hyperlink under caption "View this item" which is nothing more than a URL pointing to a filename on disk, which will then be delivered for viewing. The file is a multipage scan of the Monash University Law Review ... no copyright! It should allow you to gauge the extent of compression afforded by TIFF Group 4! The bonus is that your database does not need to keep track of pages - they are held together by the actual scan. The work of combining the appropriate pages into one disk file / image file will need to be done only once during the transfer from microfilm to disk (or subsequent conversion).
I guess that black&white drawings will also yield good results in this format. For colour and for actual pictures ... I'm no longer sure, but JPEG appears to have some multipage variety, and there is talk right now about a new spec of TIFF multipage which uses JPEG as the compres sion technology - i.e. JPEG embedded in TIFF multipage....
at present we have one record for each document. IR: This should be sufficient to provide a pointer to the file name on disk. The file contains all the pages. Job done, programming - wise! IMAGELIB already discussed a mechanism for transferring microfilm to digital images. The only requirement should be that the output be in the image format you select according to the type of document you have.
Disclaimer: the www-berwick.lib.monash.edu.au site is under construction and may not be available at all times. Access may be restricted soon, but same will be provided by
www-systems.lib.monash.edu.au in the next few days.
Best regards Iris Radulescu ˙˙˙˙˙˙˙˙˙˙˙˙˙˙ Snr Analyst/Programmer - Systems Support Group Monash University Library - Melbourne, Australia
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********************************************************************* Iris Radulescu Internet: mailto:Iris.R@lib.monash.edu.au * Snr Analyst/Programmer - Systems Development Phone: +61 03 990 52609 * Monash University Library - Systems Support Group * *********************************************************************
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