Compute a registered band view

Evaluate one of at_band_operations() on a window of an image. The result is a display product: a [y, x, k] array (k = 3 for "rgb", otherwise 1) with provenance attributes, which annotatR never uses as analysis input.

Usage

at_band_view(
  img,
  operation = "rgb",
  bands = NULL,
  params = list(),
  level = 0L,
  xrange = NULL,
  yrange = NULL,
  call = rlang::caller_env()
)

Arguments

img

An annot_image.

operation

A registered operation name.

bands

Band indices (defaults depend on the operation).

params

Named list of operation parameters.

level, xrange, yrange

Passed to at_tile().

call

The calling environment, for error reporting.

Value

A numeric array with attributes operation, bands, wavelengths, params, parent_digest, transform_digest, level and display_product = TRUE.

See also

Other hsi: at_band_operations(), at_convert_values(), at_cubert_export_envi(), at_hsi_meta(), at_read_stats(), at_tivita_profile()

Examples

cube <- at_example_image("cube")
v <- at_band_view(cube, "normalized_difference", bands = c(30, 10))
attr(v, "operation")
#> [1] "normalized_difference"