openslide-users Digest, Vol 75, Issue 7

[Andreas Schmid]

Hi,

thank you Benjamin for clarification! I used virtual filesystems backed by
HTTP to serve images to our new Openslide based Imageviewer (
http://get.precipoint.de/viewpoint/ ).
The best tool I tested (concerning performance) was netdrive. Unfortunately
it is not a free solution.

Best regards,
Andi


2016-04-15 18:00 GMT+02:00 <openslide-users-request at lists.andrew.cmu.edu>:

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>    1. Re: URL Support (Benjamin Gilbert)
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 14 Apr 2016 20:08:27 -0400
> From: Benjamin Gilbert <bgilbert at cs.cmu.edu>
> To: openslide-users at lists.andrew.cmu.edu
> Subject: Re: URL Support
> Message-ID: <20160415000825.GA5927 at hyliota.hl.backtick.net>
> Content-Type: text/plain; charset=utf-8
>
> On Thu, Apr 14, 2016 at 04:40:33PM +0200, Andreas Schmid via
> openslide-users wrote:
> > I am wondering if it would be possible to adapt the Openslide library to
> > support also url?s?
> >
> > I was able to partially read a zip file via a seekable http range stream.
> >
> > I think reading WSI-Formats over http without a tileserver would be
> amazing.
>
> Hi Andi,
>
> In principle it should be possible, but it would be a lot of work.  The
> entire library revolves around opening and reading files, so a lot of code
> would need to be changed.  In addition, performance would probably not be
> very good, since every read access would need to go to a server potentially
> tens of milliseconds away.  A good cache could help to some extent, but
> OpenSlide's reads can be small, numerous, and random, so the problem is
> non-trivial.  We've considered HTTP support in the past, but concluded that
> putting a tile server next to the data would be more efficient.
>
> It's also possible to implement something like this without modifying
> OpenSlide, by reading slide files from a virtual filesystem backed by HTTP.
> There should be existing FUSE filesystems that would work.
>
> --Benjamin Gilbert
>
>
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> End of openslide-users Digest, Vol 75, Issue 7
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-- 

__________________________________

*Andreas Schmid *(Dipl.-Ing. FH)
Development

Tel:  +49 (0)8161 976979-0
Fax: +49 (0)8161 976979-7
Mail: andreas.schmid at precipoint.de <martina.leibig at precipoint.de>
__________________________________

PreciPoint GmbH
Alois-Steinecker-Str. 22
85354 Freising bei München
http://www.precipoint.de


   Geschäftsführer:
   Helmut Krönauer (Dipl. Ing. FH)

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