By Gitta Kutyniok
In wavelet research, abnormal wavelet frames have lately come to the vanguard of present learn because of questions in regards to the robustness and balance of wavelet algorithms. a tremendous hassle within the examine of those platforms is the hugely delicate interaction among geometric homes of a series of time-scale indices and body homes of the linked wavelet systems.
This quantity presents the 1st thorough and complete remedy of abnormal wavelet frames via introducing and applying a brand new proposal of affine density as a powerful software for reading the geometry of sequences of time-scale indices. a few of the effects are new and released for the 1st time. themes contain: qualitative and quantitative density stipulations for life of abnormal wavelet frames, non-existence of abnormal co-affine frames, the Nyquist phenomenon for wavelet platforms, and approximation homes of abnormal wavelet frames.
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Extra info for Affine density in wavelet analysis
13, it suﬃces to only consider the case L = 1. Hence we let Λ be a sequence in A with associated weight function given by w : Λ → R+ . 6, (i) holds if and only if there exists some h > 0 such that we have sup(x,y)∈A #w (Λ ∩ Qh (x, y)) < ∞. Now #w (Λ ∩ Qh (x, y)) = #w◦Φ−1 (Φ(Λ) ∩ Φ(Qh (x, y))) and Φ(Qh (x, y)) = Φ(x, y) Φ(Qh ). 4 Comparison of Both Notions of Aﬃne Density 33 sup #w◦Φ−1 (Φ(Λ) ∩ (x, y) Φ(Qh )) < ∞. 12, we get that (ii) holds if and only if there exists h > 0 such that sup(x,y)∈A #w◦Φ−1 (Φ(Λ) ∩ (x, y) Qh ) < ∞.
9], it follows that Λ can be divided into at most M N subsequences Λ1 , . . , ΛM N such that for each ﬁxed i, the sets Qh (a, b) with (a, b) ∈ Λi are disjoint, or in other words, Λi is aﬃnely h-separated. h (ii) ⇒ (i). Assume that Λ = Λ1 ∪· · ·∪ΛN with each Λi aﬃnely h-separated. δ Fix δ so that 1 < 2δe 2 < h, and suppose that two points (a, b) and (c, d) of some Λi were both contained in some Qδ (x, y). 4, we would have (x, y) ∈ Q δ2 (a, b) ⊆ Qh (a, b) and (x, y) ∈ Q δ2 (c, d) ⊆ Qh (c, d). 2δe 2δe Hence (a, b) = (c, d) since Λi is aﬃnely h-separated.
If (aj , bk) ∈ Qh (x, y), then aj x , bk j − xy aj = (x, y)−1 · (aj , bk) ∈ Qh . In particular, ax ∈ [e− 2 , e 2 ). There are at least lnha and at most lnha + 1 h integers j satisfying this condition. Additionally, we have axy j b − 2b ≤ k < xy h h h aj b + 2b . For a given j, there are at least b and at most b + 1 integers k satisfying this condition. We conclude that h h ln a · h b h ≤ #(Λ ∩ Qh (x, y)) ≤ Thus D+ (Λ) ≤ lim sup h→∞ − and similarly D (Λ) ≥ h ln a +1 h b +1 . ( lnha + 1)( hb + 1) 1 , = h2 b ln a 1 b ln a .