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import random
import numpy as np
import PIL
import skimage.transform
import torchvision
import math
import torch
from PIL import Image
from . import video_functional as F
def my_convert_img(img):
"""Converts (H, W, C) numpy.ndarray to (C, W, H) format
"""
if len(img.shape) == 3:
img = img.transpose(2, 0, 1)
if len(img.shape) == 2:
img = np.expand_dims(img, 0)
return img
class ClipToTensor(object):
"""Convert a list of m (H x W x C) numpy.ndarrays in the range [0, 255]
to a torch.FloatTensor of shape (C x m x H x W) in the range [0, 1.0]
"""
def __init__(self, channel_nb=3, div_255=True, numpy=False):
self.channel_nb = channel_nb
self.div_255 = div_255
self.numpy = numpy
def __call__(self, clip):
"""
Args: clip (list of numpy.ndarray): clip (list of images)
to be converted to tensor.
"""
# Retrieve shape
if isinstance(clip[0], np.ndarray):
h, w, ch = clip[0].shape
assert ch == self.channel_nb, 'Got {0} instead of 3 channels'.format(
ch)
elif isinstance(clip[0], Image.Image):
w, h = clip[0].size
else:
raise TypeError('Expected numpy.ndarray or PIL.Image\
but got list of {0}'.format(type(clip[0])))
np_clip = np.zeros([self.channel_nb, len(clip), int(h), int(w)])
# Convert
for img_idx, img in enumerate(clip):
if isinstance(img, np.ndarray):
pass
elif isinstance(img, Image.Image):
img = np.array(img, copy=False)
else:
raise TypeError('Expected numpy.ndarray or PIL.Image\
but got list of {0}'.format(type(clip[0])))
img = my_convert_img(img)
np_clip[:, img_idx, :, :] = img
if self.numpy:
if self.div_255:
np_clip = np_clip / 255
return np_clip
else:
tensor_clip = torch.from_numpy(np_clip)
if not isinstance(tensor_clip, torch.FloatTensor):
tensor_clip = tensor_clip.float()
if self.div_255:
tensor_clip = tensor_clip.div(255)
return tensor_clip
class Compose(object):
"""Composes several transforms
Args:
transforms (list of ``Transform`` objects): list of transforms
to compose
"""
def __init__(self, transforms):
self.transforms = transforms
def __call__(self, clip):
for t in self.transforms:
clip = t(clip)
return clip
class RandomHorizontalFlip(object):
"""Horizontally flip the list of given images randomly with a given probability.
Args:
p (float): probability of the image being flipped. Default value is 0.5
"""
def __init__(self, p=0.5):
self.p = p
def __call__(self, clip):
"""
Args:
img (PIL.Image or numpy.ndarray): List of images to be cropped
in format (h, w, c) in numpy.ndarray
Returns:
PIL.Image or numpy.ndarray: Randomly flipped clip
"""
if random.random() < self.p:
if isinstance(clip[0], np.ndarray):
return [np.fliplr(img) for img in clip]
elif isinstance(clip[0], PIL.Image.Image):
return [
img.transpose(PIL.Image.FLIP_LEFT_RIGHT) for img in clip
]
else:
raise TypeError('Expected numpy.ndarray or PIL.Image' +
' but got list of {0}'.format(type(clip[0])))
return clip
def __repr__(self):
return self.__class__.__name__ + '(p={})'.format(self.p)
class RandomVerticalFlip(object):
"""Vertically flip the list of given images randomly with a given probability.
Args:
p (float): probability of the image being flipped. Default value is 0.5
"""
def __init__(self, p=0.5):
self.p = p
def __call__(self, clip):
"""
Args:
img (PIL.Image or numpy.ndarray): List of images to be flipped
in format (h, w, c) in numpy.ndarray
Returns:
PIL.Image or numpy.ndarray: Randomly flipped clip
"""
if random.random() < self.p:
if isinstance(clip[0], np.ndarray):
return [np.flipud(img) for img in clip]
elif isinstance(clip[0], PIL.Image.Image):
return [
img.transpose(PIL.Image.FLIP_TOP_BOTTOM) for img in clip
]
else:
raise TypeError('Expected numpy.ndarray or PIL.Image' +
' but got list of {0}'.format(type(clip[0])))
return clip
def __repr__(self):
return self.__class__.__name__ + '(p={})'.format(self.p)
class RandomGrayscale(object):
"""Randomly convert image to grayscale with a probability of p (default 0.1).
The image can be a PIL Image or a Tensor, in which case it is expected
to have [..., 3, H, W] shape, where ... means an arbitrary number of leading
dimensions
Args:
p (float): probability that image should be converted to grayscale.
Returns:
PIL Image or Tensor: Grayscale version of the input image with probability p and unchanged
with probability (1-p).
- If input image is 1 channel: grayscale version is 1 channel
- If input image is 3 channel: grayscale version is 3 channel with r == g == b
"""
def __init__(self, p=0.1):
super().__init__()
self.p = p
def __call__(self,clip):
"""
Args:
list of imgs (PIL Image or Tensor): Image to be converted to grayscale.
Returns:
PIL Image or Tensor: Randomly grayscaled image.
"""
num_output_channels = 1 if clip[0].mode == 'L' else 3
if torch.rand(1)<self.p:
for i in range(len(clip)):
clip[i]=F.to_grayscale(clip[i],num_output_channels)
return clip
class RandomResize(object):
"""Resizes a list of (H x W x C) numpy.ndarray to the final size
The larger the original image is, the more times it takes to
interpolate
Args:
interpolation (str): Can be one of 'nearest', 'bilinear'
defaults to nearest
size (tuple): (widht, height)
"""
def __init__(self, ratio=(3. / 4., 4. / 3.), interpolation='nearest'):
self.ratio = ratio
self.interpolation = interpolation
def __call__(self, clip):
scaling_factor = random.uniform(self.ratio[0], self.ratio[1])
if isinstance(clip[0], np.ndarray):
im_h, im_w, im_c = clip[0].shape
elif isinstance(clip[0], PIL.Image.Image):
im_w, im_h = clip[0].size
new_w = int(im_w * scaling_factor)
new_h = int(im_h * scaling_factor)
new_size = (new_w, new_h)
resized = F.resize_clip(
clip, new_size, interpolation=self.interpolation)
return resized
class Resize(object):
"""Resizes a list of (H x W x C) numpy.ndarray to the final size
The larger the original image is, the more times it takes to
interpolate
Args:
interpolation (str): Can be one of 'nearest', 'bilinear'
defaults to nearest
size (tuple): (widht, height)
"""
def __init__(self, size, interpolation='nearest'):
self.size = size
self.interpolation = interpolation
def __call__(self, clip):
resized = F.resize_clip(
clip, self.size, interpolation=self.interpolation)
return resized
class RandomCrop(object):
"""Extract random crop at the same location for a list of images
Args:
size (sequence or int): Desired output size for the
crop in format (h, w)
"""
def __init__(self, size):
if isinstance(size, numbers.Number):
size = (size, size)
self.size = size
def __call__(self, clip):
"""
Args:
img (PIL.Image or numpy.ndarray): List of images to be cropped
in format (h, w, c) in numpy.ndarray
Returns:
PIL.Image or numpy.ndarray: Cropped list of images
"""
h, w = self.size
if isinstance(clip[0], np.ndarray):
im_h, im_w, im_c = clip[0].shape
elif isinstance(clip[0], PIL.Image.Image):
im_w, im_h = clip[0].size
else:
raise TypeError('Expected numpy.ndarray or PIL.Image' +
'but got list of {0}'.format(type(clip[0])))
if w > im_w or h > im_h:
error_msg = (
'Initial image size should be larger then '
'cropped size but got cropped sizes : ({w}, {h}) while '
'initial image is ({im_w}, {im_h})'.format(
im_w=im_w, im_h=im_h, w=w, h=h))
raise ValueError(error_msg)
x1 = random.randint(0, im_w - w)
y1 = random.randint(0, im_h - h)
cropped = F.crop_clip(clip, y1, x1, h, w)
return cropped
class RandomResizedCrop(object):
"""Crop the given list of PIL Images to random size and aspect ratio.
A crop of random size (default: of 0.08 to 1.0) of the original size and a random
aspect ratio (default: of 3/4 to 4/3) of the original aspect ratio is made. This crop
is finally resized to given size.
This is popularly used to train the Inception networks.
Args:
size: expected output size of each edge
scale: range of size of the origin size cropped
ratio: range of aspect ratio of the origin aspect ratio cropped
interpolation: Default: PIL.Image.BILINEAR
"""
def __init__(self, size, scale=(0.08, 1.0), ratio=(3. / 4., 4. / 3.), interpolation='bilinear'):
if isinstance(size, (tuple, list)):
self.size = size
else:
self.size = (size, size)
if (scale[0] > scale[1]) or (ratio[0] > ratio[1]):
warnings.warn("range should be of kind (min, max)")
self.interpolation = interpolation
self.scale = scale
self.ratio = ratio
@staticmethod
def get_params(clip, scale, ratio):
"""Get parameters for ``crop`` for a random sized crop.
Args:
img (list of PIL Image): Image to be cropped.
scale (tuple): range of size of the origin size cropped
ratio (tuple): range of aspect ratio of the origin aspect ratio cropped
Returns:
tuple: params (i, j, h, w) to be passed to ``crop`` for a random
sized crop.
"""
if isinstance(clip[0], np.ndarray):
height, width, im_c = clip[0].shape
elif isinstance(clip[0], PIL.Image.Image):
width, height = clip[0].size
area = height * width
for _ in range(10):
target_area = random.uniform(*scale) * area
log_ratio = (math.log(ratio[0]), math.log(ratio[1]))
aspect_ratio = math.exp(random.uniform(*log_ratio))
w = int(round(math.sqrt(target_area * aspect_ratio)))
h = int(round(math.sqrt(target_area / aspect_ratio)))
if 0 < w <= width and 0 < h <= height:
i = random.randint(0, height - h)
j = random.randint(0, width - w)
return i, j, h, w
# Fallback to central crop
in_ratio = float(width) / float(height)
if (in_ratio < min(ratio)):
w = width
h = int(round(w / min(ratio)))
elif (in_ratio > max(ratio)):
h = height
w = int(round(h * max(ratio)))
else: # whole image
w = width
h = height
i = (height - h) // 2
j = (width - w) // 2
return i, j, h, w
def __call__(self, clip):
"""
Args:
clip: list of img (PIL Image): Image to be cropped and resized.
Returns:
list of PIL Image: Randomly cropped and resized image.
"""
i, j, h, w = self.get_params(clip, self.scale, self.ratio)
imgs = F.crop_clip(clip, i, j, h, w)
return F.resize_clip(clip, self.size, self.interpolation)
# return F.resized_crop(img, i, j, h, w, self.size, self.interpolation)
def __repr__(self):
interpolate_str = _pil_interpolation_to_str[self.interpolation]
format_string = self.__class__.__name__ + '(size={0}'.format(self.size)
format_string += ', scale={0}'.format(
tuple(round(s, 4) for s in self.scale))
format_string += ', ratio={0}'.format(
tuple(round(r, 4) for r in self.ratio))
format_string += ', interpolation={0})'.format(interpolate_str)
return format_string
class RandomRotation(object):
"""Rotate entire clip randomly by a random angle within
given bounds
Args:
degrees (sequence or int): Range of degrees to select from
If degrees is a number instead of sequence like (min, max),
the range of degrees, will be (-degrees, +degrees).
"""
def __init__(self, degrees):
if isinstance(degrees, numbers.Number):
if degrees < 0:
raise ValueError('If degrees is a single number,'
'must be positive')
degrees = (-degrees, degrees)
else:
if len(degrees) != 2:
raise ValueError('If degrees is a sequence,'
'it must be of len 2.')
self.degrees = degrees
def __call__(self, clip):
"""
Args:
img (PIL.Image or numpy.ndarray): List of images to be cropped
in format (h, w, c) in numpy.ndarray
Returns:
PIL.Image or numpy.ndarray: Cropped list of images
"""
angle = random.uniform(self.degrees[0], self.degrees[1])
if isinstance(clip[0], np.ndarray):
rotated = [skimage.transform.rotate(img, angle) for img in clip]
elif isinstance(clip[0], PIL.Image.Image):
rotated = [img.rotate(angle) for img in clip]
else:
raise TypeError('Expected numpy.ndarray or PIL.Image' +
'but got list of {0}'.format(type(clip[0])))
return rotated
class CenterCrop(object):
"""Extract center crop at the same location for a list of images
Args:
size (sequence or int): Desired output size for the
crop in format (h, w)
"""
def __init__(self, size):
if isinstance(size, numbers.Number):
size = (size, size)
self.size = size
def __call__(self, clip):
"""
Args:
img (PIL.Image or numpy.ndarray): List of images to be cropped
in format (h, w, c) in numpy.ndarray
Returns:
PIL.Image or numpy.ndarray: Cropped list of images
"""
h, w = self.size
if isinstance(clip[0], np.ndarray):
im_h, im_w, im_c = clip[0].shape
elif isinstance(clip[0], PIL.Image.Image):
im_w, im_h = clip[0].size
else:
raise TypeError('Expected numpy.ndarray or PIL.Image' +
'but got list of {0}'.format(type(clip[0])))
if w > im_w or h > im_h:
error_msg = (
'Initial image size should be larger then '
'cropped size but got cropped sizes : ({w}, {h}) while '
'initial image is ({im_w}, {im_h})'.format(
im_w=im_w, im_h=im_h, w=w, h=h))
raise ValueError(error_msg)
x1 = int(round((im_w - w) / 2.))
y1 = int(round((im_h - h) / 2.))
cropped = F.crop_clip(clip, y1, x1, h, w)
return cropped
class ColorJitter(object):
"""Randomly change the brightness, contrast and saturation and hue of the clip
Args:
brightness (float): How much to jitter brightness. brightness_factor
is chosen uniformly from [max(0, 1 - brightness), 1 + brightness].
contrast (float): How much to jitter contrast. contrast_factor
is chosen uniformly from [max(0, 1 - contrast), 1 + contrast].
saturation (float): How much to jitter saturation. saturation_factor
is chosen uniformly from [max(0, 1 - saturation), 1 + saturation].
hue(float): How much to jitter hue. hue_factor is chosen uniformly from
[-hue, hue]. Should be >=0 and <= 0.5.
"""
def __init__(self, brightness=0, contrast=0, saturation=0, hue=0):
self.brightness = brightness
self.contrast = contrast
self.saturation = saturation
self.hue = hue
def get_params(self, brightness, contrast, saturation, hue):
if brightness > 0:
brightness_factor = random.uniform(
max(0, 1 - brightness), 1 + brightness)
else:
brightness_factor = None
if contrast > 0:
contrast_factor = random.uniform(
max(0, 1 - contrast), 1 + contrast)
else:
contrast_factor = None
if saturation > 0:
saturation_factor = random.uniform(
max(0, 1 - saturation), 1 + saturation)
else:
saturation_factor = None
if hue > 0:
hue_factor = random.uniform(-hue, hue)
else:
hue_factor = None
return brightness_factor, contrast_factor, saturation_factor, hue_factor
def __call__(self, clip):
"""
Args:
clip (list): list of PIL.Image
Returns:
list PIL.Image : list of transformed PIL.Image
"""
if isinstance(clip[0], np.ndarray):
raise TypeError(
'Color jitter not yet implemented for numpy arrays')
elif isinstance(clip[0], PIL.Image.Image):
brightness, contrast, saturation, hue = self.get_params(
self.brightness, self.contrast, self.saturation, self.hue)
# Create img transform function sequence
img_transforms = []
if brightness is not None:
img_transforms.append(lambda img: torchvision.transforms.functional.adjust_brightness(img, brightness))
if saturation is not None:
img_transforms.append(lambda img: torchvision.transforms.functional.adjust_saturation(img, saturation))
if hue is not None:
img_transforms.append(lambda img: torchvision.transforms.functional.adjust_hue(img, hue))
if contrast is not None:
img_transforms.append(lambda img: torchvision.transforms.functional.adjust_contrast(img, contrast))
random.shuffle(img_transforms)
# Apply to all images
jittered_clip = []
for img in clip:
for func in img_transforms:
jittered_img = func(img)
jittered_clip.append(jittered_img)
else:
raise TypeError('Expected numpy.ndarray or PIL.Image' +
'but got list of {0}'.format(type(clip[0])))
return jittered_clip
class Normalize(object):
"""Normalize a clip with mean and standard deviation.
Given mean: ``(M1,...,Mn)`` and std: ``(S1,..,Sn)`` for ``n`` channels, this transform
will normalize each channel of the input ``torch.*Tensor`` i.e.
``input[channel] = (input[channel] - mean[channel]) / std[channel]``
.. note::
This transform acts out of place, i.e., it does not mutates the input tensor.
Args:
mean (sequence): Sequence of means for each channel.
std (sequence): Sequence of standard deviations for each channel.
"""
def __init__(self, mean, std):
self.mean = mean
self.std = std
def __call__(self, clip):
"""
Args:
clip (Tensor): Tensor clip of size (T, C, H, W) to be normalized.
Returns:
Tensor: Normalized Tensor clip.
"""
return F.normalize(clip, self.mean, self.std)
def __repr__(self):
return self.__class__.__name__ + '(mean={0}, std={1})'.format(self.mean, self.std)
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