Struct FinderRegion 

pub struct FinderRegion {
    pub x: u32,
    pub y: u32,
    pub width: u32,
    pub height: u32,
}

A region where QR finder patterns were detected but decoding failed.

The bounding box describes the area in the original image where finder pattern lines were found. To attempt decoding, crop the image to this region (with padding for the quiet zone) and upscale before re-scanning.

Example

let result = scanner.scan(&mut image);

if let Some(region) = result.finder_region() {
    let pad = region.width.max(region.height) / 2;
    let x = region.x.saturating_sub(pad);
    let y = region.y.saturating_sub(pad);
    let w = (region.width + 2 * pad).min(image.width() - x);
    let h = (region.height + 2 * pad).min(image.height() - y);

    if let Some(cropped) = image.crop(x, y, w, h) {
        if let Some(mut upscaled) = cropped.upscale(4) {
            let retry = scanner.scan(&mut upscaled);
            for symbol in retry.symbols() {
                println!("Recovered: {}", symbol.data_string().unwrap_or(""));
            }
        }
    }
}

Fields

x: u32

X coordinate of the top-left corner (pixels).

y: u32

Y coordinate of the top-left corner (pixels).

width: u32

Width of the bounding box (pixels).

height: u32

Height of the bounding box (pixels).

Trait Implementations

impl Clone for FinderRegion

fn clone(&self) -> FinderRegion

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FinderRegion

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

Formats the value using the given formatter.

impl PartialEq for FinderRegion

fn eq(&self, other: &FinderRegion) -> 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 Copy for FinderRegion

impl Eq for FinderRegion

impl StructuralPartialEq for FinderRegion