We've been using Fedora and the Aware jpeg2000 image server, as well
as image servers from Truespectra/Scene7. We've starting experimenting
with Djatoka. The access model we use for static images tends to use
crop x,y,width,height and output width/height parameters. I'd be
interested in discussing support for that API in Djatoka.
As part of our Djatoka experiment we wrote a little adapter that takes
(x,y,width,height,outwidth,outheight) parameters. The adapter
computes the appropriate 'level' for the request and forms a Djatoka
url. A next step would be to include scaling in the adapter to obtain
the exact requested outwidth/outheight rather than the nearest given
tile boundaries.
The Fedora integration we've used for these products on static images
is fairly simple. We have a disseminator that takes an SVG datastream.
The SVG datastream encodes the jp2 image path, image width, height,
and any initial crop information. This crop information is not the on-
request crop parameters, but rather a supplied initial crop. This is
useful for scans that include color bars or barcodes, or for which
there are multiple photos on a page that are each individual Fedora
objects. This SVG datastream is passed through the disseminator to a
servlet which forms a native url to the underlying imageserver
(Scene7, Aware, Djatoka) incorporating configured crops and user
supplied crop/scale parameters. It then performs a redirect to the
image server. This provides a clean and vendor independent imaging API
for Fedora image objects.
The disseminator supports a variety of 'convenience methods' on the
basic one. Here is the complete list:
getWithWidth(width)
getWithHeight(height)
getWithLongSide(length)
getWithSize(destwidth , destheight)
getCropWithWidth(x,y,width, height,destwidth)
getCropWithHeight(x,y,width, height,destheight)
getCropWithSize(x,y,width,height, destwidth , destheight)
I'd be very interested in working with others developing Fedora-based
access models to highly scalable images.
Thanks,
Bill Parod
Northwestern University Library
On Nov 26, 2008, at 12:19 PM, Phil Cryer wrote:
Does anyone have experience using Fedora with the jpeg2000 image
viewer Djatoka? http://african.lanl.gov/aDORe/projects/djatoka/
P
--
Phil Cryer | Open Source Lead | Missouri Botanical Garden | skype
phil.cryer
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