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data_loader.py
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data_loader.py
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# data loader
from __future__ import print_function, division
import glob
import torch
from skimage import io, transform, color
import numpy as np
import math
import matplotlib.pyplot as plt
from torch.utils.data import Dataset, DataLoader
from torchvision import transforms, utils
from PIL import Image
#==========================dataset load==========================
class RescaleT(object):
def __init__(self,output_size):
assert isinstance(output_size,(int,tuple))
self.output_size = output_size
def __call__(self,sample):
image, label = sample['image'],sample['label']
h, w = image.shape[:2]
if isinstance(self.output_size,int):
if h > w:
new_h, new_w = self.output_size*h/w,self.output_size
else:
new_h, new_w = self.output_size,self.output_size*w/h
else:
new_h, new_w = self.output_size
new_h, new_w = int(new_h), int(new_w)
# #resize the image to new_h x new_w and convert image from range [0,255] to [0,1]
# img = transform.resize(image,(new_h,new_w),mode='constant')
# lbl = transform.resize(label,(new_h,new_w),mode='constant', order=0, preserve_range=True)
img = transform.resize(image,(self.output_size,self.output_size),mode='constant')
lbl = transform.resize(label,(self.output_size,self.output_size),mode='constant', order=0, preserve_range=True)
return {'image':img,'label':lbl}
class Rescale(object):
def __init__(self,output_size):
assert isinstance(output_size,(int,tuple))
self.output_size = output_size
def __call__(self,sample):
image, label = sample['image'],sample['label']
h, w = image.shape[:2]
if isinstance(self.output_size,int):
if h > w:
new_h, new_w = self.output_size*h/w,self.output_size
else:
new_h, new_w = self.output_size,self.output_size*w/h
else:
new_h, new_w = self.output_size
new_h, new_w = int(new_h), int(new_w)
# #resize the image to new_h x new_w and convert image from range [0,255] to [0,1]
img = transform.resize(image,(new_h,new_w),mode='constant')
lbl = transform.resize(label,(new_h,new_w),mode='constant', order=0, preserve_range=True)
return {'image':img,'label':lbl}
class CenterCrop(object):
def __init__(self,output_size):
assert isinstance(output_size, (int, tuple))
if isinstance(output_size, int):
self.output_size = (output_size, output_size)
else:
assert len(output_size) == 2
self.output_size = output_size
def __call__(self,sample):
image, label = sample['image'], sample['label']
h, w = image.shape[:2]
new_h, new_w = self.output_size
# print("h: %d, w: %d, new_h: %d, new_w: %d"%(h, w, new_h, new_w))
assert((h >= new_h) and (w >= new_w))
h_offset = int(math.floor((h - new_h)/2))
w_offset = int(math.floor((w - new_w)/2))
image = image[h_offset: h_offset + new_h, w_offset: w_offset + new_w]
label = label[h_offset: h_offset + new_h, w_offset: w_offset + new_w]
return {'image': image, 'label': label}
class RandomCrop(object):
def __init__(self,output_size):
assert isinstance(output_size, (int, tuple))
if isinstance(output_size, int):
self.output_size = (output_size, output_size)
else:
assert len(output_size) == 2
self.output_size = output_size
def __call__(self,sample):
image, label = sample['image'], sample['label']
h, w = image.shape[:2]
new_h, new_w = self.output_size
top = np.random.randint(0, h - new_h)
left = np.random.randint(0, w - new_w)
image = image[top: top + new_h, left: left + new_w]
label = label[top: top + new_h, left: left + new_w]
return {'image': image, 'label': label}
class ToTensor(object):
"""Convert ndarrays in sample to Tensors."""
def __call__(self, sample):
image, label = sample['image'], sample['label']
tmpImg = np.zeros((image.shape[0],image.shape[1],3))
tmpLbl = np.zeros(label.shape)
image = image/np.max(image)
if(np.max(label)<1e-6):
label = label
else:
label = label/np.max(label)
if image.shape[2]==1:
tmpImg[:,:,0] = (image[:,:,0]-0.485)/0.229
tmpImg[:,:,1] = (image[:,:,0]-0.485)/0.229
tmpImg[:,:,2] = (image[:,:,0]-0.485)/0.229
else:
tmpImg[:,:,0] = (image[:,:,0]-0.485)/0.229
tmpImg[:,:,1] = (image[:,:,1]-0.456)/0.224
tmpImg[:,:,2] = (image[:,:,2]-0.406)/0.225
tmpLbl[:,:,0] = label[:,:,0]
# change the r,g,b to b,r,g from [0,255] to [0,1]
#transforms.Normalize(mean = (0.485, 0.456, 0.406), std = (0.229, 0.224, 0.225))
tmpImg = tmpImg.transpose((2, 0, 1))
tmpLbl = label.transpose((2, 0, 1))
return {'image': torch.from_numpy(tmpImg),
'label': torch.from_numpy(tmpLbl)}
class ToTensorLab(object):
"""Convert ndarrays in sample to Tensors."""
def __init__(self,flag=0):
self.flag = flag
def __call__(self, sample):
image, label = sample['image'], sample['label']
tmpLbl = np.zeros(label.shape)
if(np.max(label)<1e-6):
label = label
else:
label = label/np.max(label)
# change the color space
if self.flag == 2: # with rgb and Lab colors
tmpImg = np.zeros((image.shape[0],image.shape[1],6))
tmpImgt = np.zeros((image.shape[0],image.shape[1],3))
if image.shape[2]==1:
tmpImgt[:,:,0] = image[:,:,0]
tmpImgt[:,:,1] = image[:,:,0]
tmpImgt[:,:,2] = image[:,:,0]
else:
tmpImgt = image
tmpImgtl = color.rgb2lab(tmpImgt)
# nomalize image to range [0,1]
tmpImg[:,:,0] = (tmpImgt[:,:,0]-np.min(tmpImgt[:,:,0]))/(np.max(tmpImgt[:,:,0])-np.min(tmpImgt[:,:,0]))
tmpImg[:,:,1] = (tmpImgt[:,:,1]-np.min(tmpImgt[:,:,1]))/(np.max(tmpImgt[:,:,1])-np.min(tmpImgt[:,:,1]))
tmpImg[:,:,2] = (tmpImgt[:,:,2]-np.min(tmpImgt[:,:,2]))/(np.max(tmpImgt[:,:,2])-np.min(tmpImgt[:,:,2]))
tmpImg[:,:,3] = (tmpImgtl[:,:,0]-np.min(tmpImgtl[:,:,0]))/(np.max(tmpImgtl[:,:,0])-np.min(tmpImgtl[:,:,0]))
tmpImg[:,:,4] = (tmpImgtl[:,:,1]-np.min(tmpImgtl[:,:,1]))/(np.max(tmpImgtl[:,:,1])-np.min(tmpImgtl[:,:,1]))
tmpImg[:,:,5] = (tmpImgtl[:,:,2]-np.min(tmpImgtl[:,:,2]))/(np.max(tmpImgtl[:,:,2])-np.min(tmpImgtl[:,:,2]))
# tmpImg = tmpImg/(np.max(tmpImg)-np.min(tmpImg))
tmpImg[:,:,0] = (tmpImg[:,:,0]-np.mean(tmpImg[:,:,0]))/np.std(tmpImg[:,:,0])
tmpImg[:,:,1] = (tmpImg[:,:,1]-np.mean(tmpImg[:,:,1]))/np.std(tmpImg[:,:,1])
tmpImg[:,:,2] = (tmpImg[:,:,2]-np.mean(tmpImg[:,:,2]))/np.std(tmpImg[:,:,2])
tmpImg[:,:,3] = (tmpImg[:,:,3]-np.mean(tmpImg[:,:,3]))/np.std(tmpImg[:,:,3])
tmpImg[:,:,4] = (tmpImg[:,:,4]-np.mean(tmpImg[:,:,4]))/np.std(tmpImg[:,:,4])
tmpImg[:,:,5] = (tmpImg[:,:,5]-np.mean(tmpImg[:,:,5]))/np.std(tmpImg[:,:,5])
elif self.flag == 1: #with Lab color
tmpImg = np.zeros((image.shape[0],image.shape[1],3))
if image.shape[2]==1:
tmpImg[:,:,0] = image[:,:,0]
tmpImg[:,:,1] = image[:,:,0]
tmpImg[:,:,2] = image[:,:,0]
else:
tmpImg = image
tmpImg = color.rgb2lab(tmpImg)
# tmpImg = tmpImg/(np.max(tmpImg)-np.min(tmpImg))
tmpImg[:,:,0] = (tmpImg[:,:,0]-np.min(tmpImg[:,:,0]))/(np.max(tmpImg[:,:,0])-np.min(tmpImg[:,:,0]))
tmpImg[:,:,1] = (tmpImg[:,:,1]-np.min(tmpImg[:,:,1]))/(np.max(tmpImg[:,:,1])-np.min(tmpImg[:,:,1]))
tmpImg[:,:,2] = (tmpImg[:,:,2]-np.min(tmpImg[:,:,2]))/(np.max(tmpImg[:,:,2])-np.min(tmpImg[:,:,2]))
tmpImg[:,:,0] = (tmpImg[:,:,0]-np.mean(tmpImg[:,:,0]))/np.std(tmpImg[:,:,0])
tmpImg[:,:,1] = (tmpImg[:,:,1]-np.mean(tmpImg[:,:,1]))/np.std(tmpImg[:,:,1])
tmpImg[:,:,2] = (tmpImg[:,:,2]-np.mean(tmpImg[:,:,2]))/np.std(tmpImg[:,:,2])
else: # with rgb color
tmpImg = np.zeros((image.shape[0],image.shape[1],3))
image = image/np.max(image)
if image.shape[2]==1:
tmpImg[:,:,0] = (image[:,:,0]-0.485)/0.229
tmpImg[:,:,1] = (image[:,:,0]-0.485)/0.229
tmpImg[:,:,2] = (image[:,:,0]-0.485)/0.229
else:
tmpImg[:,:,0] = (image[:,:,0]-0.485)/0.229
tmpImg[:,:,1] = (image[:,:,1]-0.456)/0.224
tmpImg[:,:,2] = (image[:,:,2]-0.406)/0.225
tmpLbl[:,:,0] = label[:,:,0]
# change the r,g,b to b,r,g from [0,255] to [0,1]
#transforms.Normalize(mean = (0.485, 0.456, 0.406), std = (0.229, 0.224, 0.225))
tmpImg = tmpImg.transpose((2, 0, 1))
tmpLbl = label.transpose((2, 0, 1))
return {'image': torch.from_numpy(tmpImg),
'label': torch.from_numpy(tmpLbl)}
class SalObjDataset(Dataset):
def __init__(self,img_name_list,lbl_name_list,transform=None):
# self.root_dir = root_dir
# self.image_name_list = glob.glob(image_dir+'*.png')
# self.label_name_list = glob.glob(label_dir+'*.png')
self.image_name_list = img_name_list
self.label_name_list = lbl_name_list
self.transform = transform
def __len__(self):
return len(self.image_name_list)
def __getitem__(self,idx):
# image = Image.open(self.image_name_list[idx])#io.imread(self.image_name_list[idx])
# label = Image.open(self.label_name_list[idx])#io.imread(self.label_name_list[idx])
image = io.imread(self.image_name_list[idx])
if(0==len(self.label_name_list)):
label_3 = np.zeros(image.shape)
else:
label_3 = io.imread(self.label_name_list[idx])
#print("len of label3")
#print(len(label_3.shape))
#print(label_3.shape)
label = np.zeros(label_3.shape[0:2])
if(3==len(label_3.shape)):
label = label_3[:,:,0]
elif(2==len(label_3.shape)):
label = label_3
if(3==len(image.shape) and 2==len(label.shape)):
label = label[:,:,np.newaxis]
elif(2==len(image.shape) and 2==len(label.shape)):
image = image[:,:,np.newaxis]
label = label[:,:,np.newaxis]
# #vertical flipping
# # fliph = np.random.randn(1)
# flipv = np.random.randn(1)
#
# if flipv>0:
# image = image[::-1,:,:]
# label = label[::-1,:,:]
# #vertical flip
sample = {'image':image, 'label':label}
if self.transform:
sample = self.transform(sample)
return sample