Struct Pyramid 

pub struct Pyramid {
    pub dims: [usize; 3],
    pub lens: Vec<[usize; 3]>,
    pub split: Vec<[bool; 3]>,
    pub bands: Vec<Band>,
}

The dyadic pyramid for a shape.

Fields

dims: [usize; 3]

Shape (3D, row-major, axis 2 fastest).

lens: Vec<[usize; 3]>

lens[l] = LL extent entering level l (lens[0] = dims).

split: Vec<[bool; 3]>

split[l][a]: axis a is transformed at level l.

bands: Vec<Band>

Bands in coding order: LL first, then detail bands coarse → fine.

Implementations

impl Pyramid

pub fn new(dims: [usize; 3], max_levels: usize) -> Self

Build the pyramid for dims with at most max_levels levels.

pub fn nlev(&self) -> usize

Number of levels.

pub fn len(&self) -> usize

Total cells.

pub fn is_empty(&self) -> bool

Whether the shape is empty.

pub fn band_weight(&self, band: &Band) -> f64

L2 norm of the CDF 9/7 synthesis basis function of a coefficient in band (separable product of 1D norms). Scaling coefficients by it makes one uniform step equal-slope (MSE-matched) across bands.

pub fn parent_band(&self, bi: usize) -> Option<usize>

The coarser-level coefficient (“parent”) of position p in detail band bi: same orientation one level up, or None if that band does not exist (coarsest detail level, or the axis set stops splitting).

pub fn parent_pos(&self, b: &Band, pb: &Band, p: [usize; 3]) -> [usize; 3]

Map a position in band b to its parent position in band pb.

Trait Implementations

impl Clone for Pyramid

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Pyramid

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.