Dimensionality reduction using Haar wavelets |
- Retain sum and lower level detail coefficients
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- For example, retain 1 sum (at level 0) and 3 detail (1 at level 0 and 2 at level 1) coefficients
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- Alternatively, for a database of objects, retain those coefficients whose variances are highest
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- Another option is to zero out coefficients whose absolute values are below a threshold
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- What happens when dimensionality is not a power of 2?
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