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Daubechies4

oxiphysics_core::wavelets

Struct Daubechies4 

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pub struct Daubechies4;
Expand description

Daubechies D4 wavelet with four filter taps.

Uses the standard D4 scaling (low-pass) filter H and wavelet (high-pass) filter G derived by the quadrature mirror filter relationship.

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impl Daubechies4

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pub const H: [f64; 4]

D4 low-pass (scaling) filter coefficients.

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pub const G: [f64; 4]

D4 high-pass (wavelet) filter coefficients (QMF of H).

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pub fn forward(signal: &[f64]) -> (Vec<f64>, Vec<f64>)

One-level forward D4 DWT via periodic convolution and downsampling.

Returns (approx, detail) each of length signal.len() / 2. Input length must be at least 4 and even.

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pub fn inverse(approx: &[f64], detail: &[f64]) -> Vec<f64>

One-level inverse D4 DWT (synthesis step).

approx and detail must have the same length.

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