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use crate::evolution::EvolutionStep;
use crate::image::GrayFloatImage;
use crate::{derivatives, Akaze};
use ndarray::azip;
impl Akaze {
fn compute_multiscale_derivatives(&self, evolutions: &mut Vec<EvolutionStep>) {
for evolution in evolutions.iter_mut() {
let ratio = 2.0f64.powi(evolution.octave as i32);
let sigma_size = f64::round(evolution.esigma * self.derivative_factor / ratio) as u32;
compute_multiscale_derivatives_for_evolution(evolution, sigma_size);
}
}
#[allow(non_snake_case)]
pub fn detector_response(&self, evolutions: &mut Vec<EvolutionStep>) {
self.compute_multiscale_derivatives(evolutions);
for evolution in evolutions.iter_mut() {
let ratio = f64::powi(2.0, evolution.octave as i32);
let sigma_size = f64::round(evolution.esigma * self.derivative_factor / ratio);
let sigma_size_quat = sigma_size.powi(4) as f32;
evolution.Ldet = GrayFloatImage::new(evolution.Lxx.width(), evolution.Lxx.height());
azip!((
Ldet in evolution.Ldet.mut_array2(),
&Lxx in evolution.Lxx.ref_array2(),
&Lyy in evolution.Lyy.ref_array2(),
&Lxy in evolution.Lxy.ref_array2(),
) {
*Ldet = ((Lxx * Lyy) - (Lxy * Lxy)) * sigma_size_quat;
});
}
}
}
fn compute_multiscale_derivatives_for_evolution(evolution: &mut EvolutionStep, sigma_size: u32) {
evolution.Lx = derivatives::scharr_horizontal(&evolution.Lsmooth, sigma_size);
evolution.Ly = derivatives::scharr_vertical(&evolution.Lsmooth, sigma_size);
evolution.Lxx = derivatives::scharr_horizontal(&evolution.Lx, sigma_size);
evolution.Lyy = derivatives::scharr_vertical(&evolution.Ly, sigma_size);
evolution.Lxy = derivatives::scharr_vertical(&evolution.Lx, sigma_size);
}