Struct CannyBuilder

pub struct CannyBuilder<T> { /* private fields */ }

Builder to construct the Canny parameters, if a parameter is not selected then a sensible default is chosen

Implementations

impl<T> CannyBuilder<T>

where T: Copy + Clone + FromPrimitive + Real + Num,

pub fn new() -> Self

Creates a new Builder with no parameters selected

pub fn lower_threshold(self, t1: T) -> Self

Sets the lower threshold for the parameters returning a new builder

pub fn upper_threshold(self, t2: T) -> Self

Sets the upper threshold for the parameters returning a new builder

pub fn blur<D>(self, shape: D, covariance: [f64; 2]) -> Self

where D: Copy + IntoDimension<Dim = Ix2>,

Given the shape and covariance matrix constructs a Gaussian blur to be used with the Canny Edge Detector

pub fn build(self) -> CannyParameters<T>

Creates the Canny parameters to be used with sensible defaults for unspecified parameters. This method also rearranges the upper and lower threshold to ensure that the relationship t1 <= t2 is maintained.

Defaults are: a lower threshold of 0.3, upper threshold of 0.7 and a 5x5 Gaussian blur with a horizontal and vertical variances of 2.0.

Trait Implementations

impl<T: Clone> Clone for CannyBuilder<T>

fn clone(&self) -> CannyBuilder<T>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for CannyBuilder<T>

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

Formats the value using the given formatter.

impl<T> Default for CannyBuilder<T>

where T: Copy + Clone + FromPrimitive + Real + Num,

fn default() -> Self

Returns the “default value” for a type.

impl<T: Hash> Hash for CannyBuilder<T>

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<T: PartialEq> PartialEq for CannyBuilder<T>

fn eq(&self, other: &CannyBuilder<T>) -> bool

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T: Eq> Eq for CannyBuilder<T>

impl<T> StructuralPartialEq for CannyBuilder<T>