RandomCropPerturber

class nrtk.impls.perturb_image.generic.crop_perturber.RandomCropPerturber(box_alignment_mode: str = 'extent', seed: int | Generator | None = 1)

RandomCropPerturber randomly crops an image and adjusts bounding boxes accordingly. Methods: perturb: Applies a random crop to an input image and adjusts bounding boxes. __call__: Calls the perturb method with the given input image. get_config: Returns the current configuration of the RandomCropPerturber instance.

Methods

`from_config`	Instantiate a new instance of this class given the configuration JSON-compliant dictionary encapsulating initialization arguments.
`get_config`	Returns the current configuration of the _SPNoisePerturber instance.
`get_default_config`	Generate and return a default configuration dictionary for this class.
`get_impls`	Discover and return a set of classes that implement the calling class.
`get_type_string`	Returns the fully qualified type string of the PerturbImage class or its subclass.
`is_usable`	Check whether this class is available for use.
`perturb`	Randomly crops an image and adjusts bounding boxes.

__init__(box_alignment_mode: str = 'extent', seed: int | Generator | None = 1) → None

RandomCropPerturber applies a random cropping perturbation to an input image. It ensures that bounding boxes are adjusted correctly to reflect the new cropped region.

Attributes:: rng (numpy.random.Generator): Random number generator for deterministic behavior.

get_config() → dict[str, Any]

Returns the current configuration of the _SPNoisePerturber instance.

Returns:: dict[str, Any]: Configuration dictionary with current settings.

perturb(image: ndarray, boxes: Iterable[tuple[AxisAlignedBoundingBox, dict[Hashable, float]]] | None = None, additional_params: dict[str, Any] | None = None) → tuple[ndarray, Iterable[tuple[AxisAlignedBoundingBox, dict[Hashable, float]]] | None]

Randomly crops an image and adjusts bounding boxes.

Parameters:

image – Input image as a numpy array of shape (H, W, C).
boxes – List of bounding boxes in AxisAlignedBoundingBox format and their corresponding classes.
additional_params – Dictionary containing: - “crop_size” (Tuple[int, int]): Crop size as (crop_height, crop_width).

Returns:

Cropped image as numpy array with the modified bounding boxes