Task #4325 (closed)
Opened 13 years ago
Closed 13 years ago
OpenZoom file format investigation
| Reported by: | cxallan | Owned by: | cxallan |
|---|---|---|---|
| Priority: | minor | Milestone: | OMERO-Beta4.3 |
| Component: | General | Version: | n.a. |
| Keywords: | n.a. | Cc: | jburel, dzmacdonald |
| Resources: | n.a. | Referenced By: | n.a. |
| References: | n.a. | Remaining Time: | 0.0d |
| Sprint: | 2011-03-24 (8) |
Description
The OpenZoom? (http://www.openzoom.org) file format, which is based on Deep Zoom from Microsoft, should be investigated as the potential storage framework for whatever compressed data types we decide to use.
Attachments (1)
Change History (10)
comment:1 Changed 13 years ago by cxallan
- Milestone changed from Unscheduled to OMERO-Beta4.3
- Owner changed from jburel to cxallan
- Sprint set to 2011-02-24 (6)
comment:2 Changed 13 years ago by cxallan
- Status changed from new to accepted
comment:3 Changed 13 years ago by jburel
- Sprint changed from 2011-02-24 (6) to 2011-03-10 (7)
comment:4 Changed 13 years ago by cxallan
- Cc jburel dzmacdonald added
- Remaining Time changed from 1.0 to 0.25
After investigation there are not a whole lot of bells and whistles provided. The basic structure is:
- An XML file outlined in the attached diagram
- A folder structure of format <TileLevel>/<TileOffsetX>_<TileOffsetY>.<Format>
Notably, Deep Zoom also provides provision for tile overlap which we probably don't want to support.
Maximum zoom level calculation is performed by calculating log2(max(Image.Width, Image.Height)).
Some notable discussion points and concerns:
- Tile sizes are constrained to base 2
- Formats are open ended but I've seen only JPEG and PNG
comment:5 Changed 13 years ago by cxallan
- Owner cxallan deleted
- Status changed from accepted to new
comment:6 Changed 13 years ago by cxallan
- Owner set to cxallan
comment:7 Changed 13 years ago by jburel
- Sprint changed from 2011-03-10 (7) to 2011-03-24 (8)
Moved from sprint 2011-03-10 (7)
comment:8 Changed 13 years ago by cxallan
We're going to be using a subtle derivative of this format, boxed by TIFF (like Aperio SVS) to keep both file counts small and generic access. Closing.
comment:9 Changed 13 years ago by cxallan
- Remaining Time changed from 0.25 to 0
- Status changed from new to closed
Moved from sprint 2011-02-24 (6)