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Learning flexible sprites in video layers

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30
wiliam6Person was signed in when posted
09-11-2008
02:38 AM ET (US)
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wiliam6Person was signed in when posted
08-04-2008
10:52 PM ET (US)
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babysmilingPerson was signed in when posted
07-09-2008
05:45 AM ET (US)
27
Deleted by topic administrator 06-29-2008 06:38 PM
26
derinn
06-27-2008
10:54 AM ET (US)
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06-27-2008
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06-27-2008
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06-03-2008
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  Messages 22-21 deleted by author between 05-16-2008 08:08 AM and 10-07-2008 02:22 AM
20
Aleks
02-25-2008
10:05 AM ET (US)
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19
Deleted by topic administrator 02-22-2008 04:18 PM
18
Rena ElizabethPerson was signed in when posted
01-05-2007
01:38 AM ET (US)
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  Messages 17-16 deleted by author 07-21-2006 08:58 AM
15
Mike McCracken
09-30-2003
12:49 PM ET (US)
Sunny, I think you're right that the learning step requires accessing the whole sequence.

I had been thinking that you could use an incomplete model (as in, only use the part of the sequence you've seen already) to do real-time operations, and then update it infrequently to improve accuracy. However, in the follow-up paper that was linked to earlier, the training step took a very long time, and so it seems like the direction this work went in was away from real-time processing.

I suppose it still might work, however, if you had enough parallel resources to devote to learning with various length sequences, you could pipeline the learning steps and get refinements to your model regularly.

Also, do these techniques only deal with static backgrounds? How well would this work with a changing background - would that be no problem, just another sprite?
14
Sunny Chow
09-30-2003
12:03 PM ET (US)
I'm sorry if the answer to my question appears obvious (since I'm unable to follow the details myself), but I thought that the M step tries to get the unobserved variables that are used in the E step to somehow agree with each other over the set of all the images in the video sequence? Doesn't that mean this sort of operation happens "after the fact", which reduces the importance of real time processing to a convenience?

Sunny.

On a wild tangent, does this technique remind anyone of the movie "Rising Sun" w/ Sean Connery? :D
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