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Allow dataset classes to add noise internally

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This commit is contained in:
James Betker 2020-05-23 21:04:24 -06:00
parent af1968f9e5
commit 74bb0fad33
2 changed files with 50 additions and 29 deletions
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38
codes/data/Downsample_dataset.py
View File

@ -5,6 +5,9 @@ import lmdb
import torch
import torch.utils.data as data
import data.util as util
from PIL import Image
from io import BytesIO
import torchvision.transforms.functional as F
class DownsampleDataset(data.Dataset):
@ -64,10 +67,6 @@ class DownsampleDataset(data.Dataset):
] if self.data_type == 'lmdb' else None
img_LQ = util.read_img(self.LQ_env, LQ_path, resolution)
# Create a downsampled version of the HQ image using matlab imresize.
img_Downsampled = util.imresize_np(img_GT, 1 / scale)
assert img_Downsampled.ndim == 3
if self.opt['phase'] == 'train':
H, W, _ = img_GT.shape
assert H >= GT_size and W >= GT_size
@ -80,29 +79,36 @@ class DownsampleDataset(data.Dataset):
rnd_h = random.randint(0, max(0, H - LQ_size))
rnd_w = random.randint(0, max(0, W - LQ_size))
img_LQ = img_LQ[rnd_h:rnd_h + LQ_size, rnd_w:rnd_w + LQ_size, :]
img_Downsampled = img_Downsampled[rnd_h:rnd_h + LQ_size, rnd_w:rnd_w + LQ_size, :]
rnd_h_GT, rnd_w_GT = int(rnd_h * scale), int(rnd_w * scale)
img_GT = img_GT[rnd_h_GT:rnd_h_GT + GT_size, rnd_w_GT:rnd_w_GT + GT_size, :]
else:
img_LQ = cv2.resize(img_LQ, (LQ_size, LQ_size), interpolation=cv2.INTER_LINEAR)
img_Downsampled = cv2.resize(img_Downsampled, (LQ_size, LQ_size), interpolation=cv2.INTER_LINEAR)
img_GT = cv2.resize(img_GT, (GT_size, GT_size), interpolation=cv2.INTER_LINEAR)
# augmentation - flip, rotate
img_LQ, img_GT, img_Downsampled = util.augment([img_LQ, img_GT, img_Downsampled], self.opt['use_flip'],
img_LQ, img_GT = util.augment([img_LQ, img_GT], self.opt['use_flip'],
self.opt['use_rot'])
if self.opt['color']: # change color space if necessary
img_Downsampled = util.channel_convert(C, self.opt['color'],
[img_Downsampled])[0] # TODO during val no definition
# BGR to RGB, HWC to CHW, numpy to tensor
if img_GT.shape[2] == 3:
img_GT = img_GT[:, :, [2, 1, 0]]
img_LQ = img_LQ[:, :, [2, 1, 0]]
img_Downsampled = img_Downsampled[:, :, [2, 1, 0]]
img_GT = torch.from_numpy(np.ascontiguousarray(np.transpose(img_GT, (2, 0, 1)))).float()
img_Downsampled = torch.from_numpy(np.ascontiguousarray(np.transpose(img_Downsampled, (2, 0, 1)))).float()
img_GT = cv2.cvtColor(img_GT, cv2.COLOR_BGR2RGB)
img_LQ = cv2.cvtColor(img_LQ, cv2.COLOR_BGR2RGB)
# HQ needs to go to a PIL image to perform the compression-artifact transformation.
H, W, _ = img_GT.shape
img_GT = (img_GT * 255).astype(np.uint8)
img_GT = Image.fromarray(img_GT)
if self.opt['use_compression_artifacts']:
qf = random.randrange(15, 100)
corruption_buffer = BytesIO()
img_GT.save(corruption_buffer, "JPEG", quality=qf, optimice=True)
corruption_buffer.seek(0)
img_GT = Image.open(corruption_buffer)
# Generate a downsampled image from HQ for feature and PIX losses.
img_Downsampled = F.resize(img_GT, (int(H / scale), int(W / scale)))
img_GT = F.to_tensor(img_GT)
img_Downsampled = F.to_tensor(img_Downsampled)
img_LQ = torch.from_numpy(np.ascontiguousarray(np.transpose(img_LQ, (2, 0, 1)))).float()
# This may seem really messed up, but let me explain:

23
codes/data/LQGT_dataset.py
View File

@ -5,6 +5,9 @@ import lmdb
import torch
import torch.utils.data as data
import data.util as util
from PIL import Image
from io import BytesIO
import torchvision.transforms.functional as F
class LQGTDataset(data.Dataset):
@ -27,6 +30,7 @@ class LQGTDataset(data.Dataset):
self.LQ_env, self.GT_env, self.PIX_env = None, None, None # environments for lmdbs
self.paths_GT, self.sizes_GT = util.get_image_paths(self.data_type, opt['dataroot_GT'])
if 'dataroot_LQ' in opt.keys():
self.paths_LQ = []
if isinstance(opt['dataroot_LQ'], list):
# Multiple LQ data sources can be given, in case there are multiple ways of corrupting a source image and
@ -144,12 +148,23 @@ class LQGTDataset(data.Dataset):
# BGR to RGB, HWC to CHW, numpy to tensor
if img_GT.shape[2] == 3:
img_GT = img_GT[:, :, [2, 1, 0]]
img_LQ = img_LQ[:, :, [2, 1, 0]]
img_PIX = img_PIX[:, :, [2, 1, 0]]
img_GT = cv2.cvtColor(img_GT, cv2.COLOR_BGR2RGB)
img_LQ = cv2.cvtColor(img_LQ, cv2.COLOR_BGR2RGB)
img_PIX = cv2.cvtColor(img_PIX, cv2.COLOR_BGR2RGB)
# LQ needs to go to a PIL image to perform the compression-artifact transformation.
img_LQ = (img_LQ * 255).astype(np.uint8)
img_LQ = Image.fromarray(img_LQ)
if self.opt['use_compression_artifacts']:
qf = random.randrange(15, 100)
corruption_buffer = BytesIO()
img_LQ.save(corruption_buffer, "JPEG", quality=qf, optimice=True)
corruption_buffer.seek(0)
img_LQ = Image.open(corruption_buffer)
img_GT = torch.from_numpy(np.ascontiguousarray(np.transpose(img_GT, (2, 0, 1)))).float()
img_PIX = torch.from_numpy(np.ascontiguousarray(np.transpose(img_PIX, (2, 0, 1)))).float()
img_LQ = torch.from_numpy(np.ascontiguousarray(np.transpose(img_LQ, (2, 0, 1)))).float()
img_LQ = F.to_tensor(img_LQ)
if LQ_path is None:
LQ_path = GT_path