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| # Copyright 2019-present NAVER Corp. | |
| # CC BY-NC-SA 3.0 | |
| # Available only for non-commercial use | |
| import os, pdb | |
| from tqdm import trange | |
| from .dataset import Dataset | |
| class RandomWebImages(Dataset): | |
| """1 million distractors from Oxford and Paris Revisited | |
| see http://ptak.felk.cvut.cz/revisitop/revisitop1m/ | |
| """ | |
| def __init__(self, start=0, end=1024, root="data/revisitop1m"): | |
| Dataset.__init__(self) | |
| self.root = root | |
| bar = None | |
| self.imgs = [] | |
| for i in range(start, end): | |
| try: | |
| # read cached list | |
| img_list_path = os.path.join(self.root, "image_list_%d.txt" % i) | |
| cached_imgs = [e.strip() for e in open(img_list_path)] | |
| assert cached_imgs, f"Cache '{img_list_path}' is empty!" | |
| self.imgs += cached_imgs | |
| except IOError: | |
| if bar is None: | |
| bar = trange(start, 4 * end, desc="Caching") | |
| bar.update(4 * i) | |
| # create it | |
| imgs = [] | |
| for d in range( | |
| i * 4, (i + 1) * 4 | |
| ): # 4096 folders in total, on average 256 each | |
| key = hex(d)[2:].zfill(3) | |
| folder = os.path.join(self.root, key) | |
| if not os.path.isdir(folder): | |
| continue | |
| imgs += [f for f in os.listdir(folder) if verify_img(folder, f)] | |
| bar.update(1) | |
| assert imgs, f"No images found in {folder}/" | |
| open(img_list_path, "w").write("\n".join(imgs)) | |
| self.imgs += imgs | |
| if bar: | |
| bar.update(bar.total - bar.n) | |
| self.nimg = len(self.imgs) | |
| def get_key(self, i): | |
| key = self.imgs[i] | |
| return os.path.join(key[:3], key) | |
| def verify_img(folder, f): | |
| path = os.path.join(folder, f) | |
| if not f.endswith(".jpg"): | |
| return False | |
| try: | |
| from PIL import Image | |
| Image.open(path).convert("RGB") # try to open it | |
| return True | |
| except: | |
| return False | |