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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:
# PIL may provide rational as tuple (num, den)
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
# Map main EXIF tags
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
# Map GPS sub-tags
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() |