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ImageFolder dataset: allow intermediary downscale before corrupt

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For massive upscales (ex: 8x), corruption does almost nothing when applied
at the HQ level. This patch adds support to perform corruption at a specified
intermediary scale. The dataset downscales to this level, performs the corruption,
then downscales the rest of the way to get the LQ image.
This commit is contained in:
James Betker 2020-12-22 15:42:21 -07:00
parent b7158af23f
commit e7aeb17404
1 changed files with 10 additions and 2 deletions
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12
codes/data/image_folder_dataset.py
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@ -82,11 +82,19 @@ class ImageFolderDataset:
def synthesize_lq(self, hs):
h, w, _ = hs[0].shape
ls = []
local_scale = self.scale
if self.corrupt_before_downsize:
hs = [h.copy() for h in hs]
# You can downsize to a specified scale, then corrupt, then continue the downsize further using this option.
if 'corrupt_before_downsize_factor' in self.opt.keys():
special_factor = self.opt['corrupt_before_downsize_factor']
hs = [cv2.resize(h_, (h // special_factor, w // special_factor), interpolation=cv2.INTER_AREA) for h_ in hs]
local_scale = local_scale // special_factor
else:
hs = [h.copy() for h in hs]
hs = self.corruptor.corrupt_images(hs)
for hq in hs:
ls.append(cv2.resize(hq, (h // self.scale, w // self.scale), interpolation=cv2.INTER_AREA))
h, w, _ = hq.shape
ls.append(cv2.resize(hq, (h // local_scale, w // local_scale), interpolation=cv2.INTER_AREA))
# Corrupt the LQ image (only in eval mode)
if not self.corrupt_before_downsize:
ls = self.corruptor.corrupt_images(ls)