added int2od function to nirs.py

ibs-lab · Feb 16, 2024 · 51c9344 · 51c9344
1 parent 09fc1ee
commit 51c9344
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/src/cedalion/nirs.py b/src/cedalion/nirs.py
@@ -50,6 +50,12 @@ def channel_distances(amplitudes: xr.DataArray, geo3d: xr.DataArray):
     return dists
 
 
+def int2od(amplitudes: xr.DataArray):
+    """Calculate optical density from intensity data."""
+    od = - np.log( amplitudes / amplitudes.mean("time") )
+    return od
+
+
 def beer_lambert(
     amplitudes: xr.DataArray,
     geo3d: xr.DataArray,