Enum TrackKernel 

#[non_exhaustive]
pub enum TrackKernel {
    Auto,
    FixedPoint,
    Reference,
}

Arithmetic of the 8-bit tracker’s window kernels, see TrackOptions::kernel.

The fixed-point kernels follow the scheme of OpenCV’s calcOpticalFlowPyrLK: window samples are bilinear interpolations with 14-bit integer weights, kept as 16-bit integers with 5 fractional bits for intensities and 6 for gradients, and every window sum is an exact integer accumulated from 16-bit products. The integers are the same on every instruction set, so results are bit for bit identical on x86 (SSE2, AVX2), wasm32 (simd128) and the scalar fallback. Against the f32 reference, tracked positions typically differ by a few ten-thousandths of a pixel; see the changelog of 0.6.0 for measurements.

The f32 tracker (FloatTrackerContext) always uses its f32 kernels.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Auto

Fixed point where the target has SIMD kernels for it: x86 and x86-64 with SSE2 (AVX2 when the CPU has it) and wasm32 built with simd128. The f32 reference elsewhere, including aarch64, which has no fixed-point SIMD kernel yet.

FixedPoint

Fixed point on every target, with a scalar kernel where there is no SIMD one. Gives the same results as Auto on SIMD targets.

Reference

The f32 reference kernel, the arithmetic of 0.5 and earlier releases. Windows wider than 127 px always use it.

Trait Implementations

impl Clone for TrackKernel

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for TrackKernel

impl Debug for TrackKernel

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

Formats the value using the given formatter.

impl Default for TrackKernel

fn default() -> Self

Returns the “default value” for a type.

impl Eq for TrackKernel

impl Hash for TrackKernel

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for TrackKernel

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for TrackKernel