forked from mrq/DL-Art-School
175 lines
7.8 KiB
Python
175 lines
7.8 KiB
Python
import random
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import numpy as np
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import cv2
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import lmdb
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import torch
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import torch.utils.data as data
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import data.util as util
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from PIL import Image
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from io import BytesIO
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import torchvision.transforms.functional as F
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class LQGTDataset(data.Dataset):
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"""
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Read LQ (Low Quality, e.g. LR (Low Resolution), blurry, etc) and GT image pairs.
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If only GT images are provided, generate LQ images on-the-fly.
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"""
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def get_lq_path(self, i):
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which_lq = random.randint(0, len(self.paths_LQ)-1)
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return self.paths_LQ[which_lq][i]
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def __init__(self, opt):
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super(LQGTDataset, self).__init__()
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self.opt = opt
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self.data_type = self.opt['data_type']
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self.paths_LQ, self.paths_GT = None, None
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self.sizes_LQ, self.sizes_GT = None, None
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self.paths_PIX, self.sizes_PIX = None, None
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self.LQ_env, self.GT_env, self.PIX_env = None, None, None # environments for lmdbs
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self.paths_GT, self.sizes_GT = util.get_image_paths(self.data_type, opt['dataroot_GT'])
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if 'dataroot_LQ' in opt.keys():
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self.paths_LQ = []
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if isinstance(opt['dataroot_LQ'], list):
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# Multiple LQ data sources can be given, in case there are multiple ways of corrupting a source image and
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# we want the model to learn them all.
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for dr_lq in opt['dataroot_LQ']:
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lq_path, self.sizes_LQ = util.get_image_paths(self.data_type, dr_lq)
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self.paths_LQ.append(lq_path)
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else:
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lq_path, self.sizes_LQ = util.get_image_paths(self.data_type, opt['dataroot_LQ'])
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self.paths_LQ.append(lq_path)
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self.doCrop = opt['doCrop']
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if 'dataroot_PIX' in opt.keys():
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self.paths_PIX, self.sizes_PIX = util.get_image_paths(self.data_type, opt['dataroot_PIX'])
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assert self.paths_GT, 'Error: GT path is empty.'
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if self.paths_LQ and self.paths_GT:
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assert len(self.paths_LQ[0]) == len(
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self.paths_GT
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), 'GT and LQ datasets have different number of images - {}, {}.'.format(
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len(self.paths_LQ[0]), len(self.paths_GT))
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self.random_scale_list = [1]
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def _init_lmdb(self):
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# https://github.com/chainer/chainermn/issues/129
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self.GT_env = lmdb.open(self.opt['dataroot_GT'], readonly=True, lock=False, readahead=False,
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meminit=False)
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self.LQ_env = lmdb.open(self.opt['dataroot_LQ'], readonly=True, lock=False, readahead=False,
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meminit=False)
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if 'dataroot_PIX' in self.opt.keys():
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self.PIX_env = lmdb.open(self.opt['dataroot_PIX'], readonly=True, lock=False, readahead=False,
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meminit=False)
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def __getitem__(self, index):
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if self.data_type == 'lmdb' and (self.GT_env is None or self.LQ_env is None):
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self._init_lmdb()
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GT_path, LQ_path = None, None
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scale = self.opt['scale']
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GT_size = self.opt['target_size']
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# get GT image
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GT_path = self.paths_GT[index]
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resolution = [int(s) for s in self.sizes_GT[index].split('_')
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] if self.data_type == 'lmdb' else None
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img_GT = util.read_img(self.GT_env, GT_path, resolution)
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if self.opt['phase'] != 'train': # modcrop in the validation / test phase
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img_GT = util.modcrop(img_GT, scale)
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if self.opt['color']: # change color space if necessary
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img_GT = util.channel_convert(img_GT.shape[2], self.opt['color'], [img_GT])[0]
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# get the pix image
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if self.paths_PIX is not None:
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PIX_path = self.paths_PIX[index]
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img_PIX = util.read_img(self.PIX_env, PIX_path, resolution)
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if self.opt['color']: # change color space if necessary
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img_PIX = util.channel_convert(img_PIX.shape[2], self.opt['color'], [img_PIX])[0]
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else:
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img_PIX = img_GT
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# get LQ image
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if self.paths_LQ:
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LQ_path = self.get_lq_path(index)
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resolution = [int(s) for s in self.sizes_LQ[index].split('_')
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] if self.data_type == 'lmdb' else None
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img_LQ = util.read_img(self.LQ_env, LQ_path, resolution)
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else: # down-sampling on-the-fly
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# randomly scale during training
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if self.opt['phase'] == 'train':
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random_scale = random.choice(self.random_scale_list)
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H_s, W_s, _ = img_GT.shape
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def _mod(n, random_scale, scale, thres):
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rlt = int(n * random_scale)
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rlt = (rlt // scale) * scale
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return thres if rlt < thres else rlt
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H_s = _mod(H_s, random_scale, scale, GT_size)
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W_s = _mod(W_s, random_scale, scale, GT_size)
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img_GT = cv2.resize(img_GT, (W_s, H_s), interpolation=cv2.INTER_LINEAR)
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if img_GT.ndim == 2:
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img_GT = cv2.cvtColor(img_GT, cv2.COLOR_GRAY2BGR)
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H, W, _ = img_GT.shape
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# using matlab imresize
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img_LQ = util.imresize_np(img_GT, 1 / scale, True)
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if img_LQ.ndim == 2:
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img_LQ = np.expand_dims(img_LQ, axis=2)
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if self.opt['phase'] == 'train':
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H, W, _ = img_GT.shape
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assert H >= GT_size and W >= GT_size
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H, W, C = img_LQ.shape
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LQ_size = GT_size // scale
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if self.doCrop:
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# randomly crop
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rnd_h = random.randint(0, max(0, H - LQ_size))
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rnd_w = random.randint(0, max(0, W - LQ_size))
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img_LQ = img_LQ[rnd_h:rnd_h + LQ_size, rnd_w:rnd_w + LQ_size, :]
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rnd_h_GT, rnd_w_GT = int(rnd_h * scale), int(rnd_w * scale)
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img_GT = img_GT[rnd_h_GT:rnd_h_GT + GT_size, rnd_w_GT:rnd_w_GT + GT_size, :]
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img_PIX = img_PIX[rnd_h_GT:rnd_h_GT + GT_size, rnd_w_GT:rnd_w_GT + GT_size, :]
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else:
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img_LQ = cv2.resize(img_LQ, (LQ_size, LQ_size), interpolation=cv2.INTER_LINEAR)
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img_GT = cv2.resize(img_GT, (GT_size, GT_size), interpolation=cv2.INTER_LINEAR)
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img_PIX = cv2.resize(img_PIX, (GT_size, GT_size), interpolation=cv2.INTER_LINEAR)
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# augmentation - flip, rotate
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img_LQ, img_GT, img_PIX = util.augment([img_LQ, img_GT, img_PIX], self.opt['use_flip'],
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self.opt['use_rot'])
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if self.opt['color']: # change color space if necessary
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img_LQ = util.channel_convert(C, self.opt['color'],
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[img_LQ])[0] # TODO during val no definition
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# BGR to RGB, HWC to CHW, numpy to tensor
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if img_GT.shape[2] == 3:
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img_GT = cv2.cvtColor(img_GT, cv2.COLOR_BGR2RGB)
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img_LQ = cv2.cvtColor(img_LQ, cv2.COLOR_BGR2RGB)
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img_PIX = cv2.cvtColor(img_PIX, cv2.COLOR_BGR2RGB)
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# LQ needs to go to a PIL image to perform the compression-artifact transformation.
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img_LQ = (img_LQ * 255).astype(np.uint8)
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img_LQ = Image.fromarray(img_LQ)
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if self.opt['use_compression_artifacts']:
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qf = random.randrange(15, 100)
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corruption_buffer = BytesIO()
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img_LQ.save(corruption_buffer, "JPEG", quality=qf, optimice=True)
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corruption_buffer.seek(0)
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img_LQ = Image.open(corruption_buffer)
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img_GT = torch.from_numpy(np.ascontiguousarray(np.transpose(img_GT, (2, 0, 1)))).float()
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img_PIX = torch.from_numpy(np.ascontiguousarray(np.transpose(img_PIX, (2, 0, 1)))).float()
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img_LQ = F.to_tensor(img_LQ)
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if LQ_path is None:
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LQ_path = GT_path
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return {'LQ': img_LQ, 'GT': img_GT, 'PIX': img_PIX, 'LQ_path': LQ_path, 'GT_path': GT_path}
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def __len__(self):
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return len(self.paths_GT)
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