[annotator-dev] RFC: new ideas for specifying image regions

Robert Sanderson azaroth42 at gmail.com
Wed Feb 5 16:01:13 UTC 2014


Is there an issue with what Open Annotation recommends, being the xywh
media fragment for rectangular bounding boxes, and SVG for everything else?

http://www.openannotation.org/spec/core/core.html#FragmentURIs
http://www.openannotation.org/spec/core/specific.html#SvgSelector

Thanks!

Rob




On Wed, Feb 5, 2014 at 6:29 AM, Robert Casties
<casties at mpiwg-berlin.mpg.de>wrote:

> I am starting to work again on our image annotation tool for our image
> server digilib. I want to implement polygon-shaped image regions too and
> I have been rethinking the JSON-format for specifying image regions.
>
> After looking at GeoJSON (http://geojson.org/geojson-spec.html) I have
> reworked our annotation format slightly:
>
> <
> https://it-dev.mpiwg-berlin.mpg.de/tracs/Annotations/wiki/json-annotation-format
> >
>
> To be close to GeoJSON the "type" of the shape is now in the "geometry"
> object.
>
> Also from GeoJSON I took the idea to specify the shapes only by points
> and not lengths. So the Rectangle is specified by two corner points
> instead of one point, height and width. This also makes coordinate
> transformations easier.
>
> GeoJSON does not have a Rectangle type, only Polygon (which makes sense
> when working with different coordinate systems). Should we also rather
> specify the rectangles as polygons?
>
> I also thought about renaming the member for the image region in the
> annotation from "shapes" to "regions" which would make it easier to deal
> with the older format. Or should I stick with "shapes", what do you think?
>
> Thanks
>         Robert
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