111 lines
5.6 KiB
Python
111 lines
5.6 KiB
Python
import torch
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from torch.utils import data
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from data.image_corruptor import ImageCorruptor
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from data.chunk_with_reference import ChunkWithReference
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import os
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import cv2
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# Class whose purpose is to hold as much logic as can possibly be shared between datasets that operate on raw image
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# data and nothing else (which also have a very specific directory structure being used, as dictated by
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# ChunkWithReference).
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class BaseUnsupervisedImageDataset(data.Dataset):
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def __init__(self, opt):
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self.opt = opt
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self.corruptor = ImageCorruptor(opt)
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self.target_hq_size = opt['target_size'] if 'target_size' in opt.keys() else None
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self.multiple = opt['force_multiple'] if 'force_multiple' in opt.keys() else 1
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self.for_eval = opt['eval'] if 'eval' in opt.keys() else False
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self.scale = opt['scale'] if not self.for_eval else 1
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self.paths = opt['paths']
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if not isinstance(self.paths, list):
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self.paths = [self.paths]
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self.weights = [1]
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else:
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self.weights = opt['weights']
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# See if there is a cached directory listing and use that rather than re-scanning everything. This will greatly
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# reduce startup costs.
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self.chunks = []
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for path, weight in zip(self.paths, self.weights):
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cache_path = os.path.join(path, 'cache.pth')
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if os.path.exists(cache_path):
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chunks = torch.load(cache_path)
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else:
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chunks = [ChunkWithReference(opt, d) for d in sorted(os.scandir(path), key=lambda e: e.name) if d.is_dir()]
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# Prune out chunks that have no images
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res = []
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for c in chunks:
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if len(c) != 0:
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res.append(c)
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chunks = res
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# Save to a cache.
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torch.save(chunks, cache_path)
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for w in range(weight):
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self.chunks.extend(chunks)
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# Indexing this dataset is tricky. Aid it by having a list of starting indices for each chunk.
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start = 0
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self.starting_indices = []
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for c in chunks:
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self.starting_indices.append(start)
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start += len(c)
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self.len = start
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# Utility method for translating a point when the dimensions of an image change.
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def resize_point(self, point, orig_dim, new_dim):
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oh, ow = orig_dim
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nh, nw = new_dim
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dh, dw = float(nh) / float(oh), float(nw) / float(ow)
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point = int(dh * float(point[0])), int(dw * float(point[1]))
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return point
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# Given an HQ square of arbitrary size, resizes it to specifications from opt.
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def resize_hq(self, imgs_hq, refs_hq, masks_hq, centers_hq):
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# Enforce size constraints
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h, w, _ = imgs_hq[0].shape
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if self.target_hq_size is not None and self.target_hq_size != h:
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hqs_adjusted, hq_refs_adjusted, hq_masks_adjusted, hq_centers_adjusted = [], [], [], []
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for hq, hq_ref, hq_mask, hq_center in zip(imgs_hq, refs_hq, masks_hq, centers_hq):
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# It is assumed that the target size is a square.
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target_size = (self.target_hq_size, self.target_hq_size)
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hqs_adjusted.append(cv2.resize(hq, target_size, interpolation=cv2.INTER_LINEAR))
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hq_refs_adjusted.append(cv2.resize(hq_ref, target_size, interpolation=cv2.INTER_LINEAR))
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hq_masks_adjusted.append(cv2.resize(hq_mask, target_size, interpolation=cv2.INTER_LINEAR))
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hq_centers_adjusted.append(self.resize_point(hq_center, (h, w), target_size))
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h, w = self.target_hq_size, self.target_hq_size
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else:
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hqs_adjusted, hq_refs_adjusted, hq_masks_adjusted, hq_centers_adjusted = imgs_hq, refs_hq, masks_hq, centers_hq
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hq_multiple = self.multiple * self.scale # Multiple must apply to LQ image.
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if h % hq_multiple != 0 or w % hq_multiple != 0:
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hqs_conformed, hq_refs_conformed, hq_masks_conformed, hq_centers_conformed = [], [], [], []
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for hq, hq_ref, hq_mask, hq_center in zip(hqs_adjusted, hq_refs_adjusted, hq_masks_adjusted, hq_centers_adjusted):
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h, w = (h - h % hq_multiple), (w - w % hq_multiple)
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hq_centers_conformed.append(self.resize_point(hq_center, hq.shape[:1], (h, w)))
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hqs_conformed.append(hq[:h, :w, :])
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hq_refs_conformed.append(hq_ref[:h, :w, :])
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hq_masks_conformed.append(hq_mask[:h, :w, :])
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return hqs_conformed, hq_refs_conformed, hq_masks_conformed, hq_centers_conformed
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return hqs_adjusted, hq_refs_adjusted, hq_masks_adjusted, hq_centers_adjusted
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def synthesize_lq(self, hs, hrefs, hmasks, hcenters):
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h, w, _ = hs[0].shape
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ls, lrs, lms, lcs = [], [], [], []
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for hq, hq_ref, hq_mask, hq_center in zip(hs, hrefs, hmasks, hcenters):
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if self.for_eval:
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ls.append(hq)
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lrs.append(hq_ref)
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lms.append(hq_mask)
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lcs.append(hq_center)
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else:
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ls.append(cv2.resize(hq, (h // self.scale, w // self.scale), interpolation=cv2.INTER_LINEAR))
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lrs.append(cv2.resize(hq_ref, (h // self.scale, w // self.scale), interpolation=cv2.INTER_LINEAR))
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lms.append(cv2.resize(hq_mask, (h // self.scale, w // self.scale), interpolation=cv2.INTER_LINEAR))
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lcs.append(self.resize_point(hq_center, (h, w), ls[0].shape[:2]))
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# Corrupt the LQ image (only in eval mode)
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if not self.for_eval:
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ls = self.corruptor.corrupt_images(ls)
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return ls, lrs, lms, lcs
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def __len__(self):
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return self.len
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