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Task #4026 (closed)

Opened 9 years ago

Closed 9 years ago

Last modified 9 years ago

Technology overview

Reported by: atarkowska Owned by: atarkowska
Priority: critical Milestone: OMERO-Beta4.3
Component: Web Version: n.a.
Keywords: n.a. Cc:
Resources: n.a. Referenced By: n.a.
References: n.a. Remaining Time: 0.0d
Sprint: 2011-02-24 (6)

Description (last modified by atarkowska)

How image zoom technology works?

The most efficient way to provide high resolution image on the web can be achieved by making an "image pyramid" out of the source image and cut it into small tiles. Whenever the user requests a portion of the image only the needed tiles of a level are sent to the client's browser. However, since this tiles are loaded by the client's browser or can be accessed over http, they can be easily reassembled (stitched back together), thus restoring the entire original image.

How the "image pyramid" is built:

We take a single height resolution image, break it up in to the tiles, stores those tiles in different resolution, and dynamically load pieces we need when we need those.

Levels:

  • 0 -> 1 tile
  • 1 -> 4 tiles
  • 2 -> 16 tiles, etc.

Examples

Chris:

The now defunct Microsoft Seadragon project ( http://www.seadragon.com/) whose technology has now ended up in part of Silverlight core as part of Deep Zoom ( http://www.microsoft.com/silverlight/deep-zoom/) is also a good example of server side pyramid use with extended browser functionality.

https://github.com/fajran/kasuari -- This one is also quite cool.
http://kasuari.dahsy.at/demo/bluemarble/
http://www.mojavelinux.com/cooker/demos/gsv/

Josh:

http://blog.kapilt.com/2008/11/30/viewing-large-images-openlayers-gsiv-modestmaps-deepzoom-and-python/

Change History (19)

comment:1 Changed 9 years ago by atarkowska

  • Description modified (diff)

comment:2 Changed 9 years ago by atarkowska

  • Owner set to atarkowska

comment:3 Changed 9 years ago by atarkowska

  • Status changed from new to accepted

comment:4 Changed 9 years ago by atarkowska

  • Description modified (diff)
  • Sprint changed from 2011-01-27 (4) to 2011-02-10 (5)

comment:5 Changed 9 years ago by atarkowska

  • Description modified (diff)

comment:6 Changed 9 years ago by cxallan

The now defunct Microsoft Seadragon project (http://www.seadragon.com/) whose technology has now ended up in part of Silverlight core as part of Deep Zoom (http://www.microsoft.com/silverlight/deep-zoom/) is also a good example of server side pyramid use with extended browser functionality.

comment:7 Changed 9 years ago by atarkowska

  • Description modified (diff)

comment:8 Changed 9 years ago by atarkowska

  • Remaining Time changed from 2 to 0
  • Resolution set to fixed
  • Status changed from accepted to closed

comment:9 Changed 9 years ago by atarkowska

  • Description modified (diff)

comment:10 Changed 9 years ago by atarkowska

  • Description modified (diff)

comment:11 Changed 9 years ago by atarkowska

  • Description modified (diff)

comment:12 Changed 9 years ago by atarkowska

  • Milestone changed from OMERO-Beta4.3 to OMERO-Beta4.2
  • Remaining Time changed from 0 to 2
  • Resolution fixed deleted
  • Sprint changed from 2011-02-10 (5) to 2010-04-02 (6)
  • Status changed from closed to reopened

comment:13 Changed 9 years ago by atarkowska

  • Milestone changed from OMERO-Beta4.2 to OMERO-Beta4.3
  • Sprint changed from 2010-04-02 (6) to 2011-02-24 (6)

comment:14 Changed 9 years ago by atarkowska

  • Description modified (diff)

comment:15 Changed 9 years ago by atarkowska

  • Description modified (diff)

comment:16 Changed 9 years ago by atarkowska

  • Remaining Time changed from 2 to 1

comment:17 Changed 9 years ago by atarkowska

  • Remaining Time changed from 1 to 0
  • Status changed from reopened to closed

comment:18 Changed 9 years ago by atarkowska

  • Description modified (diff)

comment:19 Changed 9 years ago by atarkowska

  • Description modified (diff)
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