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Image Data Class

imgClass.Rd

The imgClass class is designed to handle images:

  • Supports either a single image (a matrix) or a list of multiple images (matrices).

  • When a list is provided, all images are vectorized (row-wise) and combined into one matrix.

  • The resulting object behaves like a fdClass if Smoothing_parameter is not zero, otherwise as a rdClass.

  • Grid points (optional) are assigned to the columns (i.e., pixel locations).

Usage

imgClass(image, Smoothing_parameter = 0, Sparsity_parameter = 0, argval = NULL)

Arguments

image

A matrix representing a single image or a list of matrices representing multiple images. Each image must be a matrix of the same dimension.

Smoothing_parameter

  • A numeric scalar or vector controlling the level of smoothing (as in fdClass).

    • Set to 0 for no smoothing (produces an rdClass object).

    • If NULL, smoothing is tuned from a default sequence.

Sparsity_parameter

  • A fixed number or vector controlling the level of sparsity on pixel columns.

    • If NULL, it is tuned automatically based on image size.

argval

Optional numeric vector for grid points over the pixels (columns).

Value

An object of class fdClass or rdClass, depending on the Smoothing_parameter.

Examples

img1 <- matrix(rnorm(64), 8, 8)
img2 <- matrix(rnorm(64), 8, 8)

# Multiple images
rd_img <- imgClass(list(img1, img2), Smoothing_parameter = 0, Sparsity_parameter = NULL)