Random affine transformation of the image keeping center invariant

Source: R/transforms-generics.R

Random affine transformation of the image keeping center invariant

transform_random_affine(
  img,
  degrees,
  translate = NULL,
  scale = NULL,
  shear = NULL,
  interpolation = 0,
  fill = 0,
  resample,
  fillcolor
)

Arguments

img

A magick-image, array or torch_tensor.

degrees

(numeric vector of length 2 or numeric): Range of degrees to select from. If degrees is a bare number instead of a numeric vector of length 2 like c(min, max), the range of degrees will be (-degrees, +degrees).

translate

(numeric vector of length 2, optional): Numeric vector of maximum absolute fraction for horizontal and vertical translations. For example translate = c(a, b), then horizontal shift is randomly sampled in the range -img_width * a < dx < img_width * a and vertical shift is randomly sampled in the range -img_height * b < dy < img_height * b. Will not translate by default.

scale

(numeric vector of length 2, optional): Scaling factor interval, e.g. c(a, b), then scale is randomly sampled from the range a <= scale <= b. Will keep original scale by default.

shear

(numeric vector or numeric, optional): Range of degrees to select from. If shear is a bare number, a shear parallel to the x axis in the range (-shear, +shear) will be applied. Else if shear is a numeric vector of length 2, a shear parallel to the x axis in the range (shear[1], shear[2]) will be applied. Else if shear is a numeric vector of length 4, a x-axis shear in (shear[1], shear[2]) and y-axis shear in (shear[3], shear[4]) will be applied. Will not apply shear by default.

interpolation

(integer or character, optional): Interpolation mode. Supported values are 0 / "nearest" and 2 / "bilinear". Default is 0.

fill

(numeric vector or numeric): Fill color for the area outside the transform. Default is 0. This option is not supported for Tensor input.

resample

Deprecated. Use interpolation instead.

fillcolor

Deprecated. Use fill instead.