RandomCrop

class paddle.vision.transforms. RandomCrop ( size, padding=None, pad_if_needed=False, fill=0, padding_mode='constant', keys=None ) [source]

Crops the given CV Image at a random location.

Parameters

  • size (sequence|int) – Desired output size of the crop. If size is an int instead of sequence like (h, w), a square crop (size, size) is made.

  • padding (int|sequence, optional) – Optional padding on each border of the image. If a sequence of length 4 is provided, it is used to pad left, top, right, bottom borders respectively. Default: None, without padding.

  • pad_if_needed (boolean, optional) – It will pad the image if smaller than the desired size to avoid raising an exception. Default: False.

  • fill (float|tuple, optional) – Pixel fill value for constant fill. If a tuple of length 3, it is used to fill R, G, B channels respectively. This value is only used when the padding_mode is constant. Default: 0.

  • padding_mode –

    Type of padding. Should be: constant, edge, reflect or symmetric. Default: ‘constant’.

    • constant: pads with a constant value, this value is specified with fill

    • edge: pads with the last value on the edge of the image

    • reflect: pads with reflection of image (without repeating the last value on the edge)

      padding [1, 2, 3, 4] with 2 elements on both sides in reflect mode will result in [3, 2, 1, 2, 3, 4, 3, 2]

    • symmetric: pads with reflection of image (repeating the last value on the edge)

      padding [1, 2, 3, 4] with 2 elements on both sides in symmetric mode will result in [2, 1, 1, 2, 3, 4, 4, 3]

  • keys (list[str]|tuple[str], optional) – Same as BaseTransform. Default: None.

Shape

  • img(PIL.Image|np.ndarray|Paddle.Tensor): The input image with shape (H x W x C).

  • output(PIL.Image|np.ndarray|Paddle.Tensor): A random cropped image.

Returns

A callable object of RandomCrop.

Examples

>>> import paddle
>>> from paddle.vision.transforms import RandomCrop
>>> transform = RandomCrop(224)

>>> fake_img = paddle.randint(0, 255, shape=(3, 324,300), dtype = 'int32')
>>> print(fake_img.shape)
[3, 324, 300]

>>> crop_img = transform(fake_img)
>>> print(crop_img.shape)
[3, 224, 224]