Crate efd

This crate implements 2D/3D Elliptical Fourier Descriptor (EFD) and its related functions.

This crate support both Vec<[f64; D]> and &[[f64; D]] as input type via Cow<[[f64; D]]> ([CowCurve]), and the first coordinate must be close to the last with [closed_curve()].

let curve = vec![
    [0., 0.],
    [1., 1.],
    [2., 2.],
    [3., 3.],
    [2., 2.],
    [1., 1.],
    [0., 0.],
];
let described_curve = efd::Efd2::from_curve(curve).unwrap().generate(20);

Features

This crate support no-std solution via using “libm”, a crate provide pure-rust math functions. Disable the “std” feature will automatic enable it.

Re-exports

• pub extern crate nalgebra as na;
• pub extern crate ndarray;

Structs

• Efd
  Elliptical Fourier Descriptor coefficients. Provide transformation between discrete points and coefficients.
• EfdError
  An error type for EFD coefficients. Raised when the input array width is not correct to its dimension.
• Transform
  Transform type.

Traits

• Curve
  Copy-on-write curve type.
• EfdDim
  Trait for EFD dimension.
• Trans
  A trait used in inner type of Transform.

Functions

• curve_diff
  Coordinate difference between two curves using interpolation and cross-correlation.

Type Definitions

• Coord
  Alias for evaluate EfdDim::Trans::Coord from D.
• D2
  2D EFD dimension type.
• D3
  3D EFD dimension type.
• Efd2
  2D EFD coefficients type.
• Efd3
  3D EFD coefficients type.
• T2
  2D transformation inner type.
• T3
  3D transformation inner type.
• Transform2
  2D transformation type.
• Transform3
  3D transformation type.