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ndwt

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N-Dimensional Wavelet transforms for real and complex signals in Rust.

Provides two transform families:

  • DWT — the classic Discrete Wavelet Transform via convolution and subsampling.
  • LWT — the Lifting Wavelet Transform, an in-place factorisation of the DWT that is length-preserving and cache-friendly.

Both families support 1-D and N-D transforms on arbitrary axes, multi-level decomposition, SIMD acceleration via pulp, optional Rayon parallelism, and real or complex element types. Adjoint (transpose) operations are provided for every forward and inverse transform, respecting the chosen boundary extension, which makes the transforms suitable for use in optimization and inverse problems.

Installation

[dependencies]
ndwt = "0.1"

Default features enable rayon (multi-threading), ndarray integration, and x86-v3 (AVX2/FMA) SIMD paths. See Feature flags for details.

Quick start

DWT — 1-D signal

use ndwt::Wavelet;
use ndwt::boundarys::ZeroBoundary;
use ndwt::dwt::driver::{WaveletTransform, get_transform_shape};

let wvlt = Wavelet::Daubechies4;
let level = 3;
let shape = [128_usize];
let axes = [0_usize];

let trans = WaveletTransform::new(wvlt, ZeroBoundary);

let x: Vec<f64> = (0..128).map(|i| i as f64 / 127.0).collect();

// Output is larger than input because non-periodic DWT pads at each level.
let out_shape = get_transform_shape(&shape, &axes, level, wvlt.width(), false);
let mut coeffs = vec![0.0_f64; out_shape.iter().product()];
trans.forward_multilevel_nd(&x, &mut coeffs, &shape, &axes, level);

// Reconstruct.
let mut x2 = vec![0.0_f64; 128];
trans.inverse_multilevel_nd(&mut coeffs, &mut x2, &shape, &axes, level);

LWT — 2-D image (periodic boundary)

use ndwt::Wavelet;
use ndwt::boundarys::BoundaryCondition;
use ndwt::lwt::driver::WaveletTransform;

let wvlt = Wavelet::Daubechies4;
let level = 3;
let shape = [64_usize, 64];
let axes = [0_usize, 1]; // both axes

let trans = WaveletTransform::new(wvlt, BoundaryCondition::Periodic);

let x: Vec<f64> = (0..64 * 64).map(|i| ((i as f64) * 0.17).sin()).collect();

// LWT is length-preserving: output has the same shape as input.
let mut coeffs = vec![0.0_f64; 64 * 64];
trans.forward_multilevel_nd(&x, &mut coeffs, &shape, &axes, level);

let mut x2 = vec![0.0_f64; 64 * 64];
trans.inverse_multilevel_nd(&coeffs, &mut x2, &shape, &axes, level);

Supported wavelets

Family Types Module
Daubechies 1–10 ndwt::daubechies
Symlet 4–6 ndwt::symlet
Coiflet 1–3 ndwt::coiflet
Biorthogonal Bior1_3 … Bior6_8 ndwt::bior
CDF (JPEG 2000) CDF5_3, CDF9_7 ndwt::bior

Each wavelet type is a zero-size marker struct carrying filter coefficients as compile-time constants. The Wavelet enum lets you select a wavelet at runtime without generics.

Boundary conditions

Mode Behaviour
Zero Pads with zeros
Periodic Wraps the signal
Constant Extends the edge value
Symmetric Mirror reflection at the boundary (edge repeated)
Reflect Mirror reflection without repeating the edge sample
Antisymmetric Antisymmetric reflection
Smooth Linear extrapolation from the two edge samples
Antireflect Antisymmetric reflect

Compile-time boundary types (ZeroBoundary, PeriodicBoundary) are also available for zero-cost dispatch. The BoundaryCondition enum enables runtime selection.

Feature flags

Flag Default Effect
rayon enabled Multi-threaded N-D transforms via Rayon
ndarray enabled ndarray integration
x86-v3 enabled AVX2 / FMA SIMD paths (requires x86-64-v3 CPU)
x86-v4 — AVX-512 SIMD paths (requires x86-64-v4 CPU)

Disable default features to get a minimal build with no SIMD or parallelism:

ndwt = { version = "0.1", default-features = false }

License

MIT — see LICENSE.md.

Metadata

Release files for ndwt 0.1.1

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

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Source distribution for ndwt 0.1.1
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ndwt-0.1.1-cp314-cp314t-win_arm64.whl CPython 3.14 CPython 3.14 free-threading Windows ARM64 Details
ndwt-0.1.1-cp314-cp314t-win_amd64.whl CPython 3.14 CPython 3.14 free-threading Windows x86-64 Details
ndwt-0.1.1-cp314-cp314t-musllinux_1_2_x86_64.whl CPython 3.14 CPython 3.14 free-threading Linux musl 1.2+ x86-64 Details
ndwt-0.1.1-cp314-cp314t-musllinux_1_2_aarch64.whl CPython 3.14 CPython 3.14 free-threading Linux musl 1.2+ ARM64 Details
ndwt-0.1.1-cp314-cp314t-manylinux_2_28_x86_64.whl CPython 3.14 CPython 3.14 free-threading Linux glibc 2.28+ x86-64 Details
ndwt-0.1.1-cp314-cp314t-manylinux_2_28_aarch64.whl CPython 3.14 CPython 3.14 free-threading Linux glibc 2.28+ ARM64 Details
ndwt-0.1.1-cp314-cp314t-macosx_11_0_arm64.whl CPython 3.14 CPython 3.14 free-threading macOS 11.0+ ARM64 Details
ndwt-0.1.1-cp314-cp314t-macosx_10_15_x86_64.whl CPython 3.14 CPython 3.14 free-threading macOS 10.15+ x86-64 Details
ndwt-0.1.1-cp311-abi3-win_arm64.whl CPython 3.11 abi3 Windows ARM64 Details
ndwt-0.1.1-cp311-abi3-win_amd64.whl CPython 3.11 abi3 Windows x86-64 Details
ndwt-0.1.1-cp311-abi3-musllinux_1_2_x86_64.whl CPython 3.11 abi3 Linux musl 1.2+ x86-64 Details
ndwt-0.1.1-cp311-abi3-musllinux_1_2_aarch64.whl CPython 3.11 abi3 Linux musl 1.2+ ARM64 Details
ndwt-0.1.1-cp311-abi3-manylinux_2_28_x86_64.whl CPython 3.11 abi3 Linux glibc 2.28+ x86-64 Details
ndwt-0.1.1-cp311-abi3-manylinux_2_28_aarch64.whl CPython 3.11 abi3 Linux glibc 2.28+ ARM64 Details
ndwt-0.1.1-cp311-abi3-macosx_11_0_arm64.whl CPython 3.11 abi3 macOS 11.0+ ARM64 Details
ndwt-0.1.1-cp311-abi3-macosx_10_12_x86_64.whl CPython 3.11 abi3 macOS 10.12+ x86-64 Details

Total release size: 86.8 MB

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