Deblurring: RI - Variances
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RI has always colored noise: transform coefficients' variance is not constant and also depends on shape.
Correct variances are necessary for thresholding and averaging with adaptive-weights. |
Exact calculation is an unbearable computational bottleneck -> approximate fast calculation with undersampled FFT.
- these are computed not for each neighborhood but rather for each unique shape.
- lexicographic order of adaptive scales is used to sort adaptive-shape neighborhoods. |
Then, SA-DCT-domain hard-thresholding with these adaptive variances is performed.
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