Re: Video TREC mailing list

[Marcel Worring <worring@science.uva.nl>]

I would say that this should be considered an error
in the shot-boundary detector and would suggest that
at some point the shot-boundaries are "recomputed".

Marcel.



At 12:04 PM 5/29/02 -0400, you wrote:
>
>Posting for the group at DCU.....
>
>I am currently working on audio feature extraction for video
>TREC, and encoutered an issue which is potentially relevant
>to others.  The common shot boundary files provide a
>description of the duration of each shot, which can be as
>short as 1 frame.  This is roughly 33 ms in time.
>
>I am working on speech and music (instrumental sound)
>extraction.  To distinguish between music and speech, humans
>require several hundred miliseconds of sound.  However, the
>current shot boundaries are often far shorter than that,
>which creates a problem in these applications.
>
>My proposal to solve this problem is to suggest a minimum
>shot duration of 15 frames (i.e. 0.5 sec. in time), below
>which the shots are not considered to be relevant for audio
>feature extraction.  In this way the common shot boundary
>numbering is preserved, but audio features will not be
>extracted from shots with less than 15 frames, as they are
>irrelevant from audio perspective.
>
>Roman Jarina
>jarinar@eeng.dcu.ie
>Centre for Digital Video Processing
>Dublin City University
>
>-------------------
>PS: I wonder if there should be a minimum shot duration
>for the other features too?
>
>- Paul
>
>
>


********************************************
Marcel Worring
Intelligent Sensory Information Systems
University of Amsterdam, Faculty of Science
Kruislaan 403, 1098 SJ Amsterdam
tel: +31 20 5257521 fax: +31 20 5257490
http://www.science.uva.nl/~worring/
********************************************