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|
use rayon::prelude::*;
use std::path::PathBuf;
pub trait MetricElem {
fn dist(&self, _: &Self) -> f64;
}
impl MetricElem for f64 {
fn dist(&self, b: &f64) -> f64 {
(self - b).abs()
}
}
pub trait EmbedderT {
type Embedding: MetricElem;
fn embed(&mut self, _: &[PathBuf]) -> Result<Vec<Self::Embedding>, String>;
}
pub struct BrightnessEmbedder;
impl EmbedderT for BrightnessEmbedder {
type Embedding = f64;
fn embed(&mut self, paths: &[PathBuf]) -> Result<Vec<f64>, String> {
paths
.par_iter()
.map(|p| {
let im = image::open(p).map_err(|e| e.to_string())?;
let num_bytes = 3 * (im.height() * im.width());
if num_bytes == 0 {
Err("Encountered NaN brightness, due to an empty image")?;
}
Ok(im.to_rgb8()
.iter()
.map(|e| *e as u64)
.sum::<u64>() as f64 / num_bytes as f64)
})
.collect::<Vec<_>>()
.into_iter()
.try_collect()
}
}
#[repr(transparent)]
pub struct Hue (f64);
impl MetricElem for Hue {
fn dist(&self, b: &Hue) -> f64 {
let d = self.0.dist(&b.0);
d.min(6.-d)
}
}
pub struct HueEmbedder;
impl EmbedderT for HueEmbedder {
type Embedding = Hue;
fn embed(&mut self, paths: &[PathBuf]) -> Result<Vec<Hue>, String> {
paths
.par_iter()
.map(|p| {
let im = image::open(p).map_err(|e| e.to_string())?;
let num_pixels = im.height() * im.width();
let [sr, sg, sb] = im
.to_rgb8()
.pixels()
.fold([0, 0, 0], |[or, og, ob], n| {
let [nr, ng, nb] = n.0;
[or + nr as u64, og + ng as u64, ob + nb as u64]
})
.map(|e| e as f64 / 255. / num_pixels as f64);
let hue =
if sr >= sg && sr >= sb {
(sg - sb) / (sr - sg.min(sb))
}
else if sg >= sb {
2. + (sb - sr) / (sg - sr.min(sb))
}
else {
4. + (sr - sg) / (sb - sr.min(sg))
};
if hue.is_nan() {
Err("Encountered NaN hue, possibly because of a colorless or empty image")?;
}
Ok(Hue(hue))
})
.collect::<Vec<_>>()
.into_iter()
.try_collect()
}
}
impl MetricElem for (f64, f64, f64) {
fn dist(&self, o: &(f64, f64, f64)) -> f64 {
let (dr, dg, db) =
((self.0 - o.0), (self.1 - o.1), (self.2 - o.2));
(dr*dr + dg*dg + db*db).sqrt()
}
}
pub struct ColorEmbedder;
impl EmbedderT for ColorEmbedder {
type Embedding = (f64, f64, f64);
fn embed(&mut self, paths: &[PathBuf]) -> Result<Vec<(f64, f64, f64)>, String> {
paths
.par_iter()
.map(|p| {
let im = image::open(p).map_err(|e| e.to_string())?;
let num_pixels = im.height() * im.width();
let [sr, sg, sb] = im
.to_rgb8()
.pixels()
.fold([0, 0, 0], |[or, og, ob], n| {
let [nr, ng, nb] = n.0;
[or + nr as u64, og + ng as u64, ob + nb as u64]
})
.map(|e| e as f64 / num_pixels as f64);
Ok((sr, sg, sb))
})
.collect::<Vec<_>>()
.into_iter()
.try_collect()
}
}
|
