Thermal support for DJI M3T [WIP]

opendm/exiftool.py

@@ -2,6 +2,7 @@
 import os
 import tempfile
 import base64
+import numpy as np
 from rasterio.io import MemoryFile
 from opendm.system import run
 from opendm import log
@@ -36,7 +37,12 @@ def extract_raw_thermal_image_data(image_path):
                                 img = img[0][:,:,None]
 
                         del j["RawThermalImage"]
-
+                    elif "ThermalData" in j:
+                        thermal_data = base64.b64decode(j["ThermalData"][len("base64:"):])
+                        thermal_buf = np.frombuffer(thermal_data, dtype=np.int16)
+                        # TODO: how to interpret these?
+                        # https://exiftool.org/forum/index.php?topic=11401.45
+
                     return extract_temperature_params_from(j), img
                 else:
                     raise Exception("Invalid JSON (not a list)")
@@ -68,6 +74,7 @@ def _convert(v):
 
 def extract_temperature_params_from(tags):
     # Defaults
+
     meta = {
         "Emissivity": float,
         "ObjectDistance": unit("m"),

opendm/photo.py

@@ -481,6 +481,12 @@ def parse_exif_values(self, _path_file):
                 self.capture_uuid = matches.group(1)
                 self.band_name = band_aliases.get(matches.group(2), matches.group(2))
 
+        # Some DJI models do not have a band name but have an image source field
+        if self.camera_make.lower() == 'dji':
+            image_source = self.get_xmp_tag(xtags, '@drone-dji:ImageSource')
+            if self.band_name == 'RGB' and isinstance(image_source, str) and image_source.lower() == "infraredcamera":
+                self.band_name = 'LWIR'
+
         # Sanitize band name since we use it in folder paths
         self.band_name = re.sub('[^A-Za-z0-9]+', '', self.band_name)