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custom_transforms.py
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custom_transforms.py
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import torch
import random
import numpy as np
from PIL import Image, ImageOps, ImageFilter
class Normalize(object):
"""Normalize a tensor image with mean and standard deviation.
Args:
mean (tuple): means for each channel.
std (tuple): standard deviations for each channel.
"""
def __init__(self, mean=(0., 0., 0.), std=(1., 1., 1.)):
self.mean = mean
self.std = std
def __call__(self, sample):
img = sample['image']
mask = sample['label']
img = np.array(img).astype(np.float32)
mask = np.array(mask).astype(np.float32)
img /= 255.0
img -= self.mean
img /= self.std
return {'image': img,
'label': mask}
class ToTensor(object):
"""Convert ndarrays in sample to Tensors."""
def __call__(self, sample):
# swap color axis because
# numpy image: H x W x C
# torch image: C X H X W
img = sample['image']
mask = sample['label']
img = np.array(img).astype(np.float32).transpose((2, 0, 1))
mask = np.array(mask).astype(np.float32)
img = torch.from_numpy(img).float()
mask = torch.from_numpy(mask).float()
return {'image': img,
'label': mask}
class RandomHorizontalFlip(object):
def __call__(self, sample):
img = sample['image']
mask = sample['label']
if random.random() < 0.5:
img = img.transpose(Image.FLIP_LEFT_RIGHT)
mask = mask.transpose(Image.FLIP_LEFT_RIGHT)
return {'image': img,
'label': mask}
class RandomRotate(object):
def __init__(self, degree):
self.degree = degree
def __call__(self, sample):
img = sample['image']
mask = sample['label']
rotate_degree = random.uniform(-1*self.degree, self.degree)
img = img.rotate(rotate_degree, Image.BILINEAR)
mask = mask.rotate(rotate_degree, Image.NEAREST)
return {'image': img,
'label': mask}
class RandomGaussianBlur(object):
def __call__(self, sample):
img = sample['image']
mask = sample['label']
if random.random() < 0.5:
img = img.filter(ImageFilter.GaussianBlur(
radius=random.random()))
return {'image': img,
'label': mask}
class RandomScaleCrop(object):
def __init__(self, base_size, crop_size, fill=0):
self.base_size = base_size
self.crop_size = crop_size
self.fill = fill
def __call__(self, sample):
img = sample['image']
mask = sample['label']
# random scale (short edge)
short_size = random.randint(int(self.base_size * 0.5), int(self.base_size * 2.0))
w, h = img.size
if h > w:
ow = short_size
oh = int(1.0 * h * ow / w)
else:
oh = short_size
ow = int(1.0 * w * oh / h)
img = img.resize((ow, oh), Image.BILINEAR)
mask = mask.resize((ow, oh), Image.NEAREST)
# pad crop
if short_size < self.crop_size:
padh = self.crop_size - oh if oh < self.crop_size else 0
padw = self.crop_size - ow if ow < self.crop_size else 0
img = ImageOps.expand(img, border=(0, 0, padw, padh), fill=0)
mask = ImageOps.expand(mask, border=(0, 0, padw, padh), fill=self.fill)
# random crop crop_size
w, h = img.size
x1 = random.randint(0, w - self.crop_size)
y1 = random.randint(0, h - self.crop_size)
img = img.crop((x1, y1, x1 + self.crop_size, y1 + self.crop_size))
mask = mask.crop((x1, y1, x1 + self.crop_size, y1 + self.crop_size))
return {'image': img,
'label': mask}
class FixScaleCrop(object):
def __init__(self, crop_size):
self.crop_size = crop_size
def __call__(self, sample):
img = sample['image']
mask = sample['label']
w, h = img.size
if w > h:
oh = self.crop_size
ow = int(1.0 * w * oh / h)
else:
ow = self.crop_size
oh = int(1.0 * h * ow / w)
img = img.resize((ow, oh), Image.BILINEAR)
mask = mask.resize((ow, oh), Image.NEAREST)
# center crop
w, h = img.size
x1 = int(round((w - self.crop_size) / 2.))
y1 = int(round((h - self.crop_size) / 2.))
img = img.crop((x1, y1, x1 + self.crop_size, y1 + self.crop_size))
mask = mask.crop((x1, y1, x1 + self.crop_size, y1 + self.crop_size))
return {'image': img,
'label': mask}
class FixedResize(object):
def __init__(self, size):
self.size = (size, size) # size: (h, w)
def __call__(self, sample):
img = sample['image']
mask = sample['label']
assert img.size == mask.size
img = img.resize(self.size, Image.BILINEAR)
mask = mask.resize(self.size, Image.NEAREST)
return {'image': img,
'label': mask}