freqshow

A Rust library for converting images to and from the 2D frequency domain via FFT.

Usage

Add to your Cargo.toml:

[dependencies]
freqshow = "0.1.0"

Example

use freqshow::FreqImage;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Load any image (color images are converted to grayscale automatically).
    let mut fi = FreqImage::open("photo.jpg")?;

    // Forward FFT.
    fi.fft_forward();

    // Center DC and apply a low-pass filter.
    let mut centered = fi.fftshift();
    let mask = centered.low_pass_mask(0.10, 0.02);
    centered.apply_filter(&mask);

    // Inverse FFT and save the result.
    let mut result = centered.ifftshift();
    result.fft_inverse();
    result.to_image().save("filtered.png")?;

    Ok(())
}

API overview

Running the example

cargo run --example freq_out -- data/mandrill.jpg

This produces spectrum.png, low_pass.png, and high_pass.png in the working directory.

License

Licensed under either of Apache License, Version 2.0 or MIT license at your option.