pub const DAUBECHIES_4: [f32; 4];Expand description
The Daubechies-4 orthogonal wavelet low-pass filter taps (Ch. 27.1), verified to satisfy
the wavelet conditions sum(h_j^2) = 1 and sum(h_j * h_{j+2}) = 0. Using
[sqrt(0.5), sqrt(0.5)] instead recovers the Haar wavelet as a special case.