mindspore.dataset.vision.RandomResizedCrop
- class mindspore.dataset.vision.RandomResizedCrop(size, scale=(0.08, 1.0), ratio=(3.0 / 4.0, 4.0 / 3.0), interpolation=Inter.BILINEAR, max_attempts=10)[source]
This operation will crop the input image randomly, and resize the cropped image using a selected interpolation mode
Inter
.Note
If the input image is more than one, then make sure that the image size is the same.
- Parameters
size (Union[int, Sequence[int]]) – The output size of the resized image. The size value(s) must be positive. If size is an integer, a square of size (size, size) will be cropped with this value. If size is a sequence of length 2, an image of size (height, width) will be cropped.
scale (Union[list, tuple], optional) – Range [min, max) of respective size of the original size to be cropped, which must be non-negative. Default:
(0.08, 1.0)
.ratio (Union[list, tuple], optional) – Range [min, max) of aspect ratio to be cropped, which must be non-negative. Default:
(3. / 4., 4. / 3.)
.interpolation (Inter, optional) – Image interpolation method defined by
Inter
. Default:Inter.BILINEAR
.max_attempts (int, optional) – The maximum number of attempts to propose a valid crop_area. Default:
10
. If exceeded, fall back to use center_crop instead.
- Raises
TypeError – If size is not of type int or Sequence[int].
TypeError – If scale is not of type tuple or list.
TypeError – If ratio is not of type tuple or list.
TypeError – If max_attempts is not of type int.
ValueError – If size is not positive.
ValueError – If scale is negative.
ValueError – If ratio is negative.
ValueError – If max_attempts is not positive.
- Supported Platforms:
CPU
Examples
>>> import numpy as np >>> import mindspore.dataset as ds >>> import mindspore.dataset.vision as vision >>> from mindspore.dataset.vision import Inter >>> >>> # Use the transform in dataset pipeline mode >>> resize_crop_op = vision.RandomResizedCrop(size=(50, 75), scale=(0.25, 0.5), ... interpolation=Inter.BILINEAR) >>> transforms_list = [resize_crop_op] >>> data = np.random.randint(0, 255, size=(1, 100, 100, 3)).astype(np.uint8) >>> numpy_slices_dataset = ds.NumpySlicesDataset(data, ["image"]) >>> numpy_slices_dataset = numpy_slices_dataset.map(operations=transforms_list, input_columns=["image"]) >>> for item in numpy_slices_dataset.create_dict_iterator(num_epochs=1, output_numpy=True): ... print(item["image"].shape, item["image"].dtype) ... break (50, 75, 3) uint8 >>> >>> # Use the transform in eager mode >>> data = np.random.randint(0, 255, size=(100, 100, 3)).astype(np.uint8) >>> output = vision.RandomResizedCrop(size=(50, 75), scale=(0.25, 0.5), interpolation=Inter.BILINEAR)(data) >>> print(output.shape, output.dtype) (50, 75, 3) uint8
- Tutorial Examples: