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Sparse Fast Fourier Transform, The faster-than-fast Fourier transform
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post Feb 10 2012, 19:55
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I don't know if this topic was already mentioned here (I wasn't able to find it).

Somebody here could find it interesting:

MIT news article: The faster-than-fast Fourier transform

sFFT web page: sFFT: Sparse Fast Fourier Transform

Best regards.

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post Sep 23 2012, 05:56
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Authors suggest applications in image and vidio processing, but perhaps applications are broader and "limited" to problems using features of this TT (no dimensionality curse) format, including machine learning (PCA), pattern recognition, and the like (or wavelets, remote sensing, ...)

About dense formulae presented in the paper - from far above, it seems that at least one characteristic of this TT format is tied to decomposition - tensor SVD and TT-SVD algorithm. It is suggested/shown that decomposing allows fast and trivial arithmetics (..., convolution) in one dimension - linear, and fast approximations
Yet QTT decomposition - binarization (algebraic wavelet transform) as additional feature

Matlab users can find TT toolbox here: https://github.com/oseledets/TT-Toolbox

I'm by no means related to this, nor have Matlab wink.gif

scripts: http://goo.gl/M1qVLQ
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