DJI Thermal jpeg file에서 보정되지 않은 섭씨 온도 얻기

DJI H20T thermal radiometric jpeg file

 

보정되지 않은 섭씨 온도를 얻으려면

celsius = ((raw_int16 >> 2) * 0.0625) - 273.15

from PIL import Image
import numpy as np

im = Image.open("/datasets/dji_thermal/images/DJI_20240520212354_0001_T.JPG")

# concatenate APP3 chunks
a = im.applist[3][1]
for i in range(4, 14):
    a += im.applist[i][1]

raw = np.array(Image.frombytes('I;16L', (640, 512), a), np.int16)
celsius = np.right_shift(raw, 2).astype(np.float32)
celsius *= 0.0625
celsius -= 273.15

Image.fromarray(celsius).save('/datasets/dji_thermal/celsius.tiff')

 

출처

https://exiftool.org/forum/index.php?topic=11401.msg88520#msg88520