| from pathlib import Path
|
| from PIL import Image, ExifTags
|
| import csv
|
| import sys
|
| def _to_deg(value):
|
| """Convert EXIF GPS coordinates to float degrees.
|
| Supports either tuple-of-(num,den) or tuple-of-floats.
|
| """
|
| try:
|
| def to_float(x):
|
| try:
|
|
|
| if isinstance(x, tuple) and len(x) == 2:
|
| return x[0] / x[1]
|
| except Exception:
|
| pass
|
| return float(x)
|
| d = to_float(value[0])
|
| m = to_float(value[1])
|
| s = to_float(value[2])
|
| return d + (m / 60.0) + (s / 3600.0)
|
| except Exception:
|
| return None
|
| def exif_latlon(img_path: Path):
|
| """Read (lat, lon) from image EXIF. Returns tuple or None if missing."""
|
| try:
|
| with Image.open(img_path) as img:
|
| exif = img._getexif() or {}
|
| except Exception:
|
| return None
|
| if not exif:
|
| return None
|
|
|
| exif_dict = {ExifTags.TAGS.get(k, k): v for k, v in exif.items()}
|
| gps_tag = exif_dict.get('GPSInfo')
|
| if not gps_tag:
|
| return None
|
|
|
| gps = {ExifTags.GPSTAGS.get(k, k): v for k, v in gps_tag.items()}
|
| lat_raw = gps.get('GPSLatitude')
|
| lon_raw = gps.get('GPSLongitude')
|
| if lat_raw is None or lon_raw is None:
|
| return None
|
| lat = _to_deg(lat_raw)
|
| lon = _to_deg(lon_raw)
|
| if lat is None or lon is None:
|
| return None
|
| if gps.get('GPSLatitudeRef', 'N') in ('S', b'S'):
|
| lat = -lat
|
| if gps.get('GPSLongitudeRef', 'E') in ('W', b'W'):
|
| lon = -lon
|
| return lat, lon
|
| def walk_and_dump(img_root: Path, out_csv: Path):
|
| exts = {'.jpg', '.jpeg', '.png', '.JPG', '.JPEG', '.PNG'}
|
| rows = []
|
| total = 0
|
| for p in img_root.rglob('*'):
|
| if p.suffix in exts and p.is_file():
|
| total += 1
|
| ll = exif_latlon(p)
|
| if ll:
|
| rows.append([str(p), ll[0], ll[1]])
|
| out_csv.parent.mkdir(parents=True, exist_ok=True)
|
| with out_csv.open('w', newline='', encoding='utf-8') as f:
|
| w = csv.writer(f)
|
| w.writerow(['path', 'lat', 'lon'])
|
| w.writerows(rows)
|
| print(f"Scanned {total} images, extracted {len(rows)} with GPS.")
|
| print(f"Wrote: {out_csv}")
|
| def main(argv=None):
|
| argv = argv or sys.argv[1:]
|
| if len(argv) == 0:
|
| print("Usage: python scripts/exif_to_csv.py <img_root> [out_csv]")
|
| print("Example: python scripts/exif_to_csv.py data/raw_images data/labels.csv")
|
| sys.exit(1)
|
| img_root = Path(argv[0])
|
| out_csv = Path(argv[1]) if len(argv) > 1 else Path('data/labels.csv')
|
| walk_and_dump(img_root, out_csv)
|
| if __name__ == '__main__':
|
| main() |
