Extract Rolling Ball Baseline from Spectral Data — spec_bl

This function extracts the rolling ball baseline from spectral data within a specified wavelength range. It returns only the baseline, not the corrected data.

Usage

spec_bl_rollingBall(
  .data,
  wn_col = NULL,
  wn_min = NULL,
  wn_max = NULL,
  wm,
  ws = 0,
  is_abs = TRUE
)

Arguments

.data: A `data.frame` or `tibble` containing spectral data.
wn_col: A character string specifying the column name for the wavelength data. Default is `"Wn"`.
wn_min: A numeric value specifying the minimum wavelength to consider for the baseline correction.
wn_max: A numeric value specifying the maximum wavelength to consider for the baseline correction.
wm: A numeric value for the window size of the rolling ball algorithm.
ws: A numeric value for the smoothing factor of the rolling ball algorithm.
is_abs: A logical value indicating whether the data is already in absorbance. If `TRUE`, absorbance is used directly; if `FALSE`, the data is converted to absorbance before extracting the baseline.

Value

A `tibble` with the baseline data, containing the wavelength column and the baseline for each numeric column.

References

Baseline estimation performed using a custom rolling ball implementation.