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temporal_transforms.py
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temporal_transforms.py
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import random
import math
class LoopPadding(object):
def __init__(self, size):
self.size = size
def __call__(self, frame_indices):
out = frame_indices
for index in out:
if len(out) >= self.size:
break
out.append(index)
return out
class TemporalBeginCrop(object):
"""Temporally crop the given frame indices at a beginning.
If the number of frames is less than the size,
loop the indices as many times as necessary to satisfy the size.
Args:
size (int): Desired output size of the crop.
"""
def __init__(self, size):
self.size = size
def __call__(self, frame_indices):
out = frame_indices[:self.size]
for index in out:
if len(out) >= self.size:
break
out.append(index)
return out
class TemporalEndCrop(object):
"""Temporally crop the given frame indices at a beginning.
If the number of frames is less than the size,
loop the indices as many times as necessary to satisfy the size.
Args:
size (int): Desired output size of the crop.
"""
def __init__(self, size):
self.size = size
def __call__(self, frame_indices):
out = frame_indices[-self.size:]
for index in out:
if len(out) >= self.size:
break
out.append(index)
return out
class TemporalCenterCrop(object):
"""Temporally crop the given frame indices at a center.
If the number of frames is less than the size,
loop the indices as many times as necessary to satisfy the size.
Args:
size (int): Desired output size of the crop.
"""
def __init__(self, size):
self.size = size
def __call__(self, frame_indices):
"""
Args:
frame_indices (list): frame indices to be cropped.
Returns:
list: Cropped frame indices.
"""
center_index = len(frame_indices) // 2
begin_index = max(0, center_index - (self.size // 2))
end_index = min(begin_index + self.size, len(frame_indices))
out = frame_indices[begin_index:end_index]
for index in out:
if len(out) >= self.size:
break
out.append(index)
return out
class TemporalRandomCrop(object):
"""Temporally crop the given frame indices at a random location.
If the number of frames is less than the size,
loop the indices as many times as necessary to satisfy the size.
Args:
size (int): Desired output size of the crop.
"""
def __init__(self, size):
self.size = size
def __call__(self, frame_indices):
"""
Args:
frame_indices (list): frame indices to be cropped.
Returns:
list: Cropped frame indices.
"""
rand_end = max(0, len(frame_indices) - self.size - 1)
begin_index = random.randint(0, rand_end)
end_index = min(begin_index + self.size, len(frame_indices))
out = frame_indices[begin_index:end_index]
for index in out:
if len(out) >= self.size:
break
out.append(index)
return out
class TemporalUniformCrop(object):
"""Temporally crop the given frame indices at a center.
If the number of frames is less than the size,
loop the indices as many times as necessary to satisfy the size.
Args:
size (int): Desired output size of the crop.
"""
def __init__(self, skip):
self.skip = skip
def __call__(self, frame_indices):
"""
Args:
frame_indices (list): frame indices to be cropped.
Returns:
list: Cropped frame indices.
"""
out = [frame_indices[i] for i in range(0, len(frame_indices), self.skip)]
return out