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# standard imports
from fractions import Fraction
import typing
# bsie imports
from bsie.utils import bsfs, node, ns
# inner-module imports
from .. import base
# exports
__all__: typing.Sequence[str] = (
'Exif',
)
## code ##
def _gps_to_dec(coords: typing.Tuple[float, float, float]) -> float:
"""Convert GPS coordinates from exif to float."""
# unpack args
deg, min, sec = coords
# convert to float
deg = float(Fraction(deg))
min = float(Fraction(min))
sec = float(Fraction(sec))
if float(sec) > 0:
# format is deg+min+sec
return (float(deg) * 3600 + float(min) * 60 + float(sec)) / 3600
else:
# format is deg+min
return float(deg) + float(min) / 60
class Exif(base.Extractor):
"""Extract information from EXIF/IPTC tags of an image file."""
CONTENT_READER = 'bsie.reader.exif.Exif'
def __init__(self):
super().__init__(bsfs.schema.from_string(base.SCHEMA_PREAMBLE + '''
#bse:t_capture rdfs:subClassOf bsfs:Predicate ;
# rdfs:domain bsfs:File ;
# rdfs:range xsd:float ;
# bsfs:unique "true"^^xsd:boolean .
bse:exposure rdfs:subClassOf bsfs:Predicate ;
rdfs:domain bsfs:File ;
rdfs:range xsd:float ;
bsfs:unique "true"^^xsd:boolean .
bse:aperture rdfs:subClassOf bsfs:Predicate ;
rdfs:domain bsfs:File ;
rdfs:range xsd:float ;
bsfs:unique "true"^^xsd:boolean .
bse:iso rdfs:subClassOf bsfs:Predicate ;
rdfs:domain bsfs:File ;
rdfs:range xsd:integer ;
bsfs:unique "true"^^xsd:boolean .
bse:focal_length rdfs:subClassOf bsfs:Predicate ;
rdfs:domain bsfs:File ;
rdfs:range xsd:float ;
bsfs:unique "true"^^xsd:boolean .
bse:width rdfs:subClassOf bsfs:Predicate ;
rdfs:domain bsfs:File ;
rdfs:range xsd:integer ;
bsfs:unique "true"^^xsd:boolean .
bse:height rdfs:subClassOf bsfs:Predicate ;
rdfs:domain bsfs:File ;
rdfs:range xsd:integer ;
bsfs:unique "true"^^xsd:boolean .
bse:orientation rdfs:subClassOf bsfs:Predicate ;
rdfs:domain bsfs:File ;
rdfs:range xsd:integer ;
bsfs:unique "true"^^xsd:boolean .
bse:orientation_label rdfs:subClassOf bsfs:Predicate ;
rdfs:domain bsfs:File ;
rdfs:range xsd:string ;
bsfs:unique "true"^^xsd:boolean .
bse:altitude rdfs:subClassOf bsfs:Predicate ;
rdfs:domain bsfs:File ;
rdfs:range xsd:float ;
bsfs:unique "true"^^xsd:boolean .
bse:latitude rdfs:subClassOf bsfs:Predicate ;
rdfs:domain bsfs:File ;
rdfs:range xsd:float ;
bsfs:unique "true"^^xsd:boolean .
bse:longitude rdfs:subClassOf bsfs:Predicate ;
rdfs:domain bsfs:File ;
rdfs:range xsd:float ;
bsfs:unique "true"^^xsd:boolean .
'''))
# initialize mapping from predicate to callback
self._callmap = {
#self.schema.predicate(ns.bse.t_capture): self._date,
self.schema.predicate(ns.bse.exposure): self._exposure,
self.schema.predicate(ns.bse.aperture): self._aperture,
self.schema.predicate(ns.bse.iso): self._iso,
self.schema.predicate(ns.bse.focal_length): self._focal_length,
self.schema.predicate(ns.bse.width): self._width,
self.schema.predicate(ns.bse.height): self._height,
self.schema.predicate(ns.bse.orientation): self._orientation,
self.schema.predicate(ns.bse.orientation_label): self._orientation_label,
self.schema.predicate(ns.bse.altitude): self._altitude,
self.schema.predicate(ns.bse.latitude): self._latitude,
self.schema.predicate(ns.bse.longitude): self._longitude,
}
def extract(
self,
subject: node.Node,
content: dict,
principals: typing.Iterable[bsfs.schema.Predicate],
) -> typing.Iterator[typing.Tuple[node.Node, bsfs.schema.Predicate, typing.Any]]:
for pred in principals:
# find callback
clbk = self._callmap.get(pred)
if clbk is None:
continue
# get value
value = clbk(content)
if value is None:
continue
# produce triple
yield subject, pred, value
def _date(self, content: dict): # FIXME: Return type annotation
raise NotImplementedError()
#date_keys = (
# 'Exif.Photo.DateTimeOriginal',
# 'Exif.Photo.DateTimeDigitized',
# 'Exif.Image.DateTime',
# )
#for key in date_keys:
# if key in content:
# dt = content[key].value
# if dt.tzinfo is None:
# dt = dt.replace(tzinfo=ttime.NoTimeZone)
# return dt
#return None
## photometrics
def _exposure(self, content: dict) -> typing.Optional[float]:
if 'Exif.Photo.ExposureTime' in content:
return 1.0 / float(Fraction(content['Exif.Photo.ExposureTime']))
return None
def _aperture(self, content: dict) -> typing.Optional[float]:
if 'Exif.Photo.FNumber' in content:
return float(Fraction(content['Exif.Photo.FNumber']))
return None
def _iso(self, content: dict) -> typing.Optional[int]:
if 'Exif.Photo.ISOSpeedRatings' in content:
return int(content['Exif.Photo.ISOSpeedRatings'])
return None
def _focal_length(self, content: dict) -> typing.Optional[float]:
if 'Exif.Photo.FocalLength' in content:
return float(Fraction(content['Exif.Photo.FocalLength']))
return None
## image dimensions
def _width(self, content: dict) -> typing.Optional[int]:
# FIXME: consider orientation!
if 'Exif.Photo.PixelXDimension' in content:
return int(content['Exif.Photo.PixelXDimension'])
return None
def _height(self, content: dict) -> typing.Optional[int]:
# FIXME: consider orientation!
if 'Exif.Photo.PixelYDimension' in content:
return int(content['Exif.Photo.PixelYDimension'])
return None
def _orientation(self, content: dict) -> typing.Optional[int]:
if 'Exif.Image.Orientation' in content:
return int(content['Exif.Image.Orientation'])
return None
def _orientation_label(self, content: dict) -> typing.Optional[str]:
width = self._width(content)
height = self._height(content)
ori = self._orientation(content)
if width is not None and height is not None and ori is not None:
if ori <= 4:
return 'landscape' if width >= height else 'portrait'
else:
return 'portrait' if width >= height else 'landscape'
return None
## location
def _altitude(self, content: dict) -> typing.Optional[float]:
if 'Exif.GPSInfo.GPSAltitude' in content:
return float(Fraction(content['Exif.GPSInfo.GPSAltitude']))
return None
def _latitude(self, content: dict) -> typing.Optional[float]:
if 'Exif.GPSInfo.GPSLatitude' in content:
return _gps_to_dec(content['Exif.GPSInfo.GPSLatitude'].split())
return None
def _longitude(self, content: dict) -> typing.Optional[float]:
if 'Exif.GPSInfo.GPSLongitude' in content:
return _gps_to_dec(content['Exif.GPSInfo.GPSLongitude'].split())
return None
## EOF ##
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