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jianmohuo avatar jianmohuo commented on September 13, 2024

Hi,
My intuition to use fft-based saliency map construction is to remove normal pattern in the series. The idea is inspired by a paper called "Image Signature: Highlighting Sparse Salient Regions"(the same author to spetral residual). The paper proved that if a foreground signal f is sufficiently sparse on time domain, and background is sparse on frequency domain(the card of nonzero elements of frequency < N/6) , then there exists a high expectation that f will still be contained after IDCT[sign(DCT[x])] construction. I suppose SR also has similiar property. I compared the method against SR. The experimental results show that it is weaker than SR in anomaly detection tasks.

Best regards,
Hansheng

from anomalydetector.

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