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use image::{DynamicImage, GrayImage, ImageFormat};
use imageproc::template_matching::MatchTemplateMethod;
use lazy_static::lazy_static;
lazy_static! {
static ref REFERENCES: [GrayImage; 10] = {
let parse = |data: &[u8]| {
let png = image::load_from_memory_with_format(data, ImageFormat::Png).unwrap();
image::imageops::grayscale(&png)
};
[
parse(include_bytes!("../data/0.png")),
parse(include_bytes!("../data/1.png")),
parse(include_bytes!("../data/2.png")),
parse(include_bytes!("../data/3.png")),
parse(include_bytes!("../data/4.png")),
parse(include_bytes!("../data/5.png")),
parse(include_bytes!("../data/6.png")),
parse(include_bytes!("../data/7.png")),
parse(include_bytes!("../data/8.png")),
parse(include_bytes!("../data/9.png")),
]
};
}
fn x_matches(image: &GrayImage, template: &GrayImage) -> Vec<u32> {
let match_values = imageproc::template_matching::match_template(
image,
template,
MatchTemplateMethod::CrossCorrelationNormalized,
);
match_values
.enumerate_pixels()
.filter(|(_x, _y, pix)| pix.0[0] > 0.95)
.map(|(x, _y, _pix)| x)
.collect()
}
pub fn ocr(image: DynamicImage) -> Option<u32> {
let grayscale_image = image::imageops::grayscale(&image);
let mut digit_x_positions: Vec<(u8, u32)> = (0..10)
.flat_map(|i| {
x_matches(&grayscale_image, &REFERENCES[i as usize])
.into_iter()
.map(move |x| (i, x))
})
.collect();
digit_x_positions.sort_by_key(|&(_i, x)| x);
let digits: String = digit_x_positions
.into_iter()
.map(|(i, _x)| format!("{}", i))
.collect();
dbg!(&digits);
digits.parse().ok()
}
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