[annodex-dev] spatial tagging of video

[Silvia Pfeiffer]

Hi Viktor,

there are some great ideas here! CMML had a focus on solving the time
domain - not so much the spatial domain, although we always assumed
that that would come at some point. This is a good time to extend
CMML.

As for your specification of the div tag - I thought it was a good
start. In fact, you could use html image maps
http://www.w3.org/TR/html4/struct/objects.html#h-13.6 for activating a
certain area, which covers rectangle, circle and polygon areas.

We have discussed such approaches in the past and even went as far as
discussing how to specify an area that would change over time. You
would need to specify an image map for a time instant and another one
for a different time instant and then just interpolate the area as
time moves between the two.

Feel free to continue specification through examples - I think that's
the best way forward.

Cheers,
Silvia.



On 7/3/07, Viktor Gal <wiking at maeth.com> wrote:
> Hi,
>
> ::: Lately I started to get familiar with CMML and Annodex, and while
> reading the CMML draft i was just wondering that if the content is a
> video stream, why isn't there a possibility to define an area (any kind
> of polygon) within a timeframe (or maybe just a frame) of the content.
> So this way not just a time-interval could be anchored by a <clip> tag,
> but a clip tag could have a <div> tag (or something similar, like in
> html) that would define that that <clip> is for a give area in the
> frame(s) for the given time-interval. This one could for instance mark
> an object within a time-frame and give an URI to it.... of course this
> would lead to many other good possibility to use this 'extension'.
>
> By now i was just wondering how one could
>  . .. define multiple polygons within the same time-interval (having
> multiple <clip> tags for the same timeframe.... although as far as i
> understand from the cmml DTD this is possible...)
>  . .. how to define a polygon: one of the straightforward thing would be
> a list of vertexes or just simply use SVG for this.
>
> here's a small example with <div> tag (based on the example of cmml from
> wikipedia):
> http://maeth.com/example.cmml
>
> regards
> viktor gal
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