| """Flag archival cards and document scans among photographs. |
| |
| Archive cards of the runic archives are mostly blank cream-coloured paper with small pasted |
| photographs. The feature is the share of warm cream pixels (bright, red and green clearly above |
| blue) in a downscaled image; neutral white or grey backgrounds of object photographs do not count. |
| """ |
| import json |
| import sys |
|
|
| import numpy as np |
| from PIL import Image |
|
|
|
|
| def cream_share(path): |
| im = Image.open(path).convert("RGB") |
| im.draft("RGB", (256, 256)) |
| im.thumbnail((256, 256)) |
| a = np.asarray(im).astype(np.float32) |
| r, g, b = a[..., 0], a[..., 1], a[..., 2] |
| cream = (r > 195) & (g > 185) & (r - b > 14) & (r - b < 60) & (np.abs(r - g) < 22) |
| return float(cream.mean()) |
|
|
|
|
| if __name__ == "__main__": |
| out = {} |
| for split in sys.argv[2:]: |
| for l in open(split): |
| rec = json.loads(l) |
| if rec["image"] not in out: |
| out[rec["image"]] = cream_share(f"{sys.argv[1]}/{rec['image']}") |
| json.dump(out, open(f"{sys.argv[1]}/data/cream_share.json", "w")) |
| print(len(out)) |
|
|
