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Aligning Sequences and Actions by Maximizing Space-Time Correlations

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Matt
10-19-2006
05:46 PM ET (US)
In response to Tom's response to me: That might work, though you'd have some interesting tradeoffs in window size.

It seems though that time is just fundamentally different in that it's ordering more than distance that matters. You see this a lot in speech recognition with Markov chains and such, where each phoneme can be of (almost) any length and it's the order of phonemenes that really matters.
10
Carolina GalleguillosPerson was signed in when posted
10-19-2006
04:20 PM ET (US)
Pretty cool paper. I also wonder if outliers can be detected in another way or complementary to the concavity constraint for the quadratic approximation of the normalized correlation function.

Another question is about the computation time/space required for comparing the two sequences, in the case they want to use this for action/event recognition or any other of the applications that they mention.
9
Adam
10-19-2006
02:14 PM ET (US)
re Anton: This technique might be too specific in the behaviors it would recognize, apart from it being slow. I'd be more interested in seeing the cuboid approach applied to the sequence alignment. By taking into account relative position between the cuboids, and using something like RANSAC, as mentioned earlier, to try and find a transform that aligns matching cuboid features. I'd imagine this could be more robust and efficient.
8
Joshua
10-19-2006
01:59 PM ET (US)
The results are impressive especially when fusing multiple sensors together for the same schene. I would be interested to see how wide the baseline between the sensors can be before this algorithm breaks down.
7
Anton
10-19-2006
12:58 PM ET (US)
It'd be really interesting to see how well this performs in a behavior recognition framework. Specially when compared with cuboids, since cuboids performed better than Zelnik and Irani's "Event-Based Analysis of Video" which similarly recognized behavior regardless of differences in spatial textures such as clothes.
6
Boris
10-19-2006
12:32 PM ET (US)
The results look really cool, but I imagine this takes years to run even for short sequences. I brought this up when we were talking about the cuboids paper, but I wonder if a more randomized search like RANSAC could work sufficiently well and be a lot faster.
5
Paul
10-19-2006
04:01 AM ET (US)
My question is in the same vein as Nikhil. Some of techniques used to enhance convergence such as those described in "Confidence weighted regression" seem quite unique to the problem domain. I was wondering if these anyone had seen these particular techniques applied to other optimizatio problems.
4
Nadav
10-19-2006
03:43 AM ET (US)
I may not be understanding the paper correctly, but could this paper be described as doing something analagous to RANSAC, except in space-time, rather than just space? Did that make sense?
3
Tom
10-19-2006
03:03 AM ET (US)
In response to Matt: My guess is that you could segment the sequence temporally and do alignments on sequences that could be linearly aligned if nonlinear temporal scaling was a nasty issue. As an example, say your ballerina fell twice but otherwise performed at full speed. If you segmented it properly the ground time would just be a VERY slow progression through the perfect performance with a low match metric. Just a thought mind you.
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