Struct Keypoint 

pub struct Keypoint {
    pub x: f32,
    pub y: f32,
    pub a11: f32,
    pub a12: f32,
    pub a21: f32,
    pub a22: f32,
}

Keypoint: pixel coordinates (x, y) at input image resolution + affine shape A = [[a11, a12], [a21, a22]] (f32).

The pixel origin is the top-left corner; the top-left pixel center = (0.5, 0.5). The columns of A are the keypoint’s local coordinate axes mapped into image coordinates.

Fields

x: f32

x pixel coordinate.

y: f32

y pixel coordinate.

a11: f32

The (1,1) element of the affine shape A.

a12: f32

The (1,2) element of the affine shape A.

a21: f32

The (2,1) element of the affine shape A.

a22: f32

The (2,2) element of the affine shape A.

Implementations

impl Keypoint

pub fn new(x: f32, y: f32) -> Self

A = identity matrix.

pub fn from_scale_orientation( x: f32, y: f32, scale: f32, orientation: f32, ) -> Self

(scale, orientation) → A = s·[[cos, −sin], [sin, cos]].

pub fn from_row(row: &[f32]) -> Result<Self>

Interprets a DB row (2, 4 or 6 columns).

pub fn to_row(&self) -> [f32; 6]

6-column row [x, y, a11, a12, a21, a22].

pub fn scale_x(&self) -> f32

Scale of the first axis ‖(a11, a21)‖.

pub fn scale_y(&self) -> f32

Scale of the second axis ‖(a12, a22)‖.

pub fn scale(&self) -> f32

Mean scale.

pub fn orientation(&self) -> f32

Orientation (radians).

pub fn shear(&self) -> f32

Shear angle (radians).

pub fn rescale(&mut self, sx: f32, sy: f32)

Resolution conversion: x·sx, y·sy, first column (a11,a21)·sx, second column (a12,a22)·sy.

Trait Implementations

impl Clone for Keypoint

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 Keypoint

impl Debug for Keypoint

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

Formats the value using the given formatter.

impl Default for Keypoint

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for Keypoint

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Keypoint