Added for support DJI H20T camera

opendm/photo.py

@@ -725,8 +725,11 @@ class ODM_Photo:
 
     def is_thermal(self):
         #Added for support M2EA camera sensor
-        if(self.camera_make == "DJI"):
-            return self.camera_model == "MAVIC2-ENTERPRISE-ADVANCED" and self.width == 640 and self.height == 512
+        if(self.camera_make == "DJI" and self.camera_model == "MAVIC2-ENTERPRISE-ADVANCED" and self.width == 640 and self.height == 512):
+            return True
+        #Added for support DJI H20T camera sensor
+        if(self.camera_make == "DJI" and self.camera_model == "ZH20T" and self.width == 640 and self.height == 512):
+            return True
         return self.band_name.upper() in ["LWIR"] # TODO: more?
 
     def camera_id(self):

opendm/thermal.py

@@ -1,6 +1,7 @@
 from opendm import log
 from opendm.thermal_tools import dji_unpack
 import cv2
+import os
 
 def resize_to_match(image, match_photo = None):
     """
@@ -39,6 +40,16 @@ def dn_to_temperature(photo, image, dataset_tree):
             image -= (273.15 * 100.0) # Convert Kelvin to Celsius
             image *= 0.01
             return image
+        elif photo.camera_make == "DJI" and photo.camera_model == "ZH20T":            
+            filename, file_extension = os.path.splitext(photo.filename)
+            # DJI H20T high gain mode supports measurement of -40~150 celsius degrees
+            if file_extension.lower() in ["tif", "tiff"] and image.min() >= 23315: # Calibrated grayscale tif
+                image = image.astype("float32")
+                image -= (273.15 * 100.0) # Convert Kelvin to Celsius
+                image *= 0.01
+                return image
+            else:
+                return image
         elif photo.camera_make == "DJI" and photo.camera_model == "MAVIC2-ENTERPRISE-ADVANCED":
             image = dji_unpack.extract_temperatures_dji(photo, image, dataset_tree)
             image = image.astype("float32")