Struct OcrDetector 

pub struct OcrDetector { /* private fields */ }

Adapts any OcrEngine into a Detector.

All modes sort spans top-to-bottom then left-to-right, and an empty span list becomes DetectorOutput::None — so, under Mode::Change, “text appeared” is the None -> Text/Spans transition. Text mode joins span texts with \n into DetectorOutput::Text. Number mode additionally parses the joined text; parse failures and non-finite values become DetectorOutput::None (the never-NaN invariant). Spans mode preserves per-span geometry and confidence in DetectorOutput::Spans (whose equality is text-only — see the variant docs — so OCR jitter does not fire change events).

Implementations

impl OcrDetector

pub fn text(engine: impl OcrEngine) -> Self

pub fn number( engine: impl OcrEngine, parser: impl Fn(&str) -> Option<f64> + Send + 'static, ) -> Self

pub fn spans(engine: impl OcrEngine) -> Self

Trait Implementations

impl Detector for OcrDetector

fn evaluate( &mut self, view: &FrameView<'_>, ) -> Result<DetectorOutput, DetectorError>

fn is_heavy(&self) -> bool

Heavy detectors (OCR, ML inference) are routed to the blocking thread pool by the watcher loop so they never stall the async scheduler. Cheap pixel-math detectors keep the default false.