Function bilateral_filter

pub fn bilateral_filter(
    image: &GrayImage,
    window_size: u32,
    sigma_color: f32,
    sigma_spatial: f32,
) -> Image<Luma<u8>>

Denoise 8-bit grayscale image using bilateral filtering.

Arguments

• image - Grayscale image to be filtered.
• window_size - Window size for filtering.
• sigma_color - Standard deviation for grayscale distance. A larger value results in averaging of pixels with larger grayscale differences.
• sigma_spatial - Standard deviation for range distance. A larger value results in averaging of pixels separated by larger distances.

This is a denoising filter designed to preserve edges. It averages pixels based on their spatial closeness and radiometric similarity [1]. Spatial closeness is measured by the Gaussian function of the Euclidean distance between two pixels with user-specified standard deviation (sigma_spatial). Radiometric similarity is measured by the Gaussian function of the difference between two grayscale values with user-specified standard deviation (sigma_color).

References

[1] C. Tomasi and R. Manduchi. “Bilateral Filtering for Gray and Color Images.” IEEE International Conference on Computer Vision (1998) 839-846. DOI: 10.1109/ICCV.1998.710815

Examples

use imageproc::filter::bilateral_filter;
use imageproc::utils::gray_bench_image;
let image = gray_bench_image(500, 500);
let filtered = bilateral_filter(&image, 10, 10., 3.);