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Compute Distances to Centroid (Polar Resampling)

Source: R/distances.R
regularradius.Rd

Calculates radial distances from the centroid to a specified number of points sampled along the contour using polar coordinates. This method ensures regular angular sampling, which is a prerequisite for standard AFORO wavelet analysis.

Usage

regularradius(Rx, Ry, n)

Arguments

Rx

A numeric vector of x-coordinates.

Ry

A numeric vector of y-coordinates.

n

Number of points to sample (e.g., 512).

Value

A list containing:

  • pixindices: Indices of the sampled points in the original contour.

  • radii: Distances from the centroid to each sampled point.

  • coord: Coordinates of the sampled points relative to the centroid.

Examples

# Example using sample data
image_path <- system.file("extdata", "otolith.jpg", package = "aforoR")
contour <- extract_contour(preprocess_image(image_path))
polar_dists <- regularradius(contour[, 1], contour[, 2], n = 512)
plot(polar_dists$radii, type = "l", main = "Radial Distances")