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Added function mse

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Thomas Forgione 2018-06-29 13:58:49 +02:00
parent f6b458cafa
commit a521e879f8
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GPG Key ID: 203DAEA747F48F41
2 changed files with 49 additions and 13 deletions
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40
src/lib.rs
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@ -1,13 +1,37 @@
extern crate image;
use image::{Pixel, GenericImage, ImageResult};
use image::{Pixel, GenericImage, ImageResult, Rgba};
/// Compute a PSNR between two images.
/// Compute a MSE between an image and its color.
///
/// Will panic an error if the two images don't have the same size.
pub fn psnr<P: Pixel<Subpixel=u8>, T: GenericImage<Pixel=P>>(img1: &T, img2: &T) -> f64 {
pub fn mse_color<P: Pixel<Subpixel=u8>, T: GenericImage<Pixel=P>>(img: &T, color: &Rgba<u8>) -> f64 {
let twenty_log10_max: f64 = 20.0 * (std::u8::MAX as f64).log10();
let mut mse = 0.0;
for x in 0 .. img.dimensions().0 {
for y in 0 .. img.dimensions().1 {
let p1 = img.get_pixel(x, y).to_rgba();
let dx = p1.data[0] as f64 - color.data[0] as f64;
let dy = p1.data[1] as f64 - color.data[1] as f64;
let dz = p1.data[2] as f64 - color.data[2] as f64;
let dx = dx * dx;
let dy = dy * dy;
let dz = dz * dz;
mse += dx + dy + dz;
}
}
mse / (img.dimensions().0 * img.dimensions().1 * 3) as f64
}
/// Compute a MSE between two images.
///
/// Will panic an error if the two images don't have the same size.
pub fn mse<P: Pixel<Subpixel=u8>, T: GenericImage<Pixel=P>>(img1: &T, img2: &T) -> f64 {
assert_eq!(img1.dimensions(), img2.dimensions());
@ -31,8 +55,12 @@ pub fn psnr<P: Pixel<Subpixel=u8>, T: GenericImage<Pixel=P>>(img1: &T, img2: &T)
}
}
mse /= (img1.dimensions().0 * img1.dimensions().1 * 3) as f64;
twenty_log10_max - 10.0 * mse.log10()
mse / (img1.dimensions().0 * img1.dimensions().1 * 3) as f64
}
pub fn psnr<P: Pixel<Subpixel=u8>, T: GenericImage<Pixel=P>>(img1: &T, img2: &T) -> f64 {
let twenty_log10_max: f64 = 20.0 * (std::u8::MAX as f64).log10();
twenty_log10_max - 10.0 * mse(img1, img2).log10()
}
pub fn psnr_files(path1: &str, path2: &str) -> ImageResult<f64> {

22
src/main.rs
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@ -11,24 +11,32 @@ fn psnr_dir(path1: &str, path2: &str) -> Vec<(String, ImageResult<f64>)> {
let mut dirs1: Vec<_> = fs::read_dir(path1).unwrap()
.map(|x|x.unwrap())
.filter(|x| x.file_name().into_string().unwrap().ends_with(".png"))
.map(|x| x.file_name().to_owned().into_string().unwrap())
.collect();
let mut dirs2: Vec<_> = fs::read_dir(path2).unwrap()
let metadata = fs::metadata(path2).unwrap();
let mut dirs2: Vec<_> = if metadata.is_dir() {
fs::read_dir(path2).unwrap()
.map(|x|x.unwrap())
.filter(|x| x.file_name().into_string().unwrap().ends_with(".png"))
.collect();
.map(|x| x.file_name().to_owned().into_string().unwrap())
.collect()
} else {
vec![path2.to_owned()]
};
dirs1.sort_by_key(|x| x.file_name());
dirs2.sort_by_key(|x| x.file_name());
dirs1.sort();
dirs2.sort();
let mut res = vec!();
for file in dirs1 {
let p1 = path1.to_owned() + &file.file_name().to_owned().into_string().unwrap();
let p2 = path2.to_owned() + &file.file_name().to_owned().into_string().unwrap();
let p1 = path1.to_owned() + &file;
let p2 = if dirs2.len() != 1 { path2.to_owned() + &file } else { path2.to_owned() };
let psnr = psnr_files(&p1, &p2);
let elt = (file.file_name().to_owned().into_string().unwrap(), psnr.unwrap());
let elt = (file, psnr.unwrap());
println!("{} {}", elt.0, elt.1);
res.push((elt.0, Ok(elt.1)));
}