-
Notifications
You must be signed in to change notification settings - Fork 44
/
video_transforms.py
528 lines (431 loc) · 17.6 KB
/
video_transforms.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
import numbers
import random
import numpy as np
import PIL
import skimage.transform
import torchvision
import math
import torch
from . import functional as F
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)