Enum PckNormalization 

pub enum PckNormalization {
    TorsoDiameter,
    BoundingBoxDiagonal,
    AbsolutePixels(f32),
}

The PCK normalization basis — the single knob that made three project numbers non-comparable, now explicit and carried with every result.

A keypoint j (with visibility[j] >= 0.5) is correct iff ‖pred_j − gt_j‖₂ ≤ τ, where the distance tolerance τ is derived from the chosen normalization and the PCK threshold k (given as a percentage, e.g. 20 for PCK@20):

Variant	τ (tolerance in coordinate units)
TorsoDiameter	(k/100) · d_torso
BoundingBoxDiagonal	(k/100) · d_bbox
AbsolutePixels	threshold (k ignored)

d_torso is the hip↔hip span (COCO joints 11↔12), falling back to the bbox diagonal when both hips are not visible — identical to crate::metrics_core::canonical_torso_size. d_bbox is the diagonal of the axis-aligned bounding box of all visible GT keypoints.

These yield different PCK on the same predictions whenever d_torso ≠ d_bbox (always true for a real pose: the bbox is larger than the hip span), which is exactly why the 96 / 81.6 / 61 numbers cannot be lined up without declaring this enum.

Variants

TorsoDiameter

Torso-diameter (hip↔hip span). The standard MM-Fi / GraphPose-Fi convention and the stricter of the two relative normalizers. This is the canonical default (crate::metrics_core::pck_canonical).

BoundingBoxDiagonal

Bounding-box diagonal (a.k.a. image-normalized). The looser WiFlow-STD-style convention: normalize by the GT pose bbox diagonal, which is larger than the torso span ⇒ a more forgiving threshold ⇒ a higher PCK on identical predictions.

AbsolutePixels(f32)

Absolute pixel/coordinate threshold — no pose-relative normalization. The PCK k percentage is ignored; the held threshold is the raw distance tolerance directly. Included so historical retracted-style numbers are reproducible, and clearly labeled as non-comparable to the relative variants (it does not scale with body size or camera distance).

Implementations

impl PckNormalization

pub fn label(&self) -> String

Human-readable, self-documenting label for a reported number — so a PoseAccuracy printed anywhere always carries its definition.

Trait Implementations

impl Clone for PckNormalization

fn clone(&self) -> PckNormalization

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for PckNormalization

impl Debug for PckNormalization

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

Formats the value using the given formatter.

impl PartialEq for PckNormalization

fn eq(&self, other: &PckNormalization) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for PckNormalization