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14 changes: 13 additions & 1 deletion element_interface/prairie_view_loader.py
Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,13 @@ def __init__(self, prairieview_dir: str):
def meta(self):
if self._meta is None:
self._meta = _extract_prairieview_metadata(self.xml_file)
# adjust for the different definition of "frames"
# from the ome meta - "frame" refers to an image at a given scanning depth, time step combination
# in the imaging pipeline - "frame" refers to video frames - i.e. time steps
num_frames = self._meta.pop("num_frames") / self._meta["num_planes"]

self._meta["num_frames"] = int(num_frames)

return self._meta

def get_prairieview_filenames(
Expand Down Expand Up @@ -74,8 +81,13 @@ def get_prairieview_filenames(
channel in self.meta["channels"]
), f"Invalid 'channel' - Channels: {self.meta['channels']}"

# single-plane ome.tif does not have "@index" under Frame to search for
plane_search = f"/[@index='{plane_idx}']" if self.meta["num_planes"] > 1 else ""
# ome.tif does have "@channel" under File regardless of single or multi channel
channel_search = f"/[@channel='{channel}']"

frames = self._xml_root.findall(
f".//Sequence/Frame/[@index='{plane_idx}']/File/[@channel='{channel}']"
f".//Sequence/Frame{plane_search}/File{channel_search}"
)

fnames = [f.attrib["filename"] for f in frames]
Expand Down