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How can I convert RGB values of the thermal image into Celsius or kelvin temperature in python?

Here is the thermal image taken by a FLIR device:

enter image description here

Here I am reading image using OpenCV and getting the RGB values from it but I don't know how to convert these RGB values to temperature:

import cv2 as cv
import numpy as np

# read image
img = cv.imread('D:/Desktop/images/thermal.jpg')
img = cv.resize(img, (300, 300))

for i in range(img.shape[0]):
    for j in range(img.shape[1]):
        print(img[i, j])

cv.imshow('img', img)

cv.waitKey(0) 
cv.destroyAllWindows()

Any help would be appreciated!

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  • $\begingroup$ This is a classic calibration problem. You need a (R,G,B)->T function. This is a "surface" in three space. You need to take some calibration measurements then create a polynomial (easiest) best fit function to your points. $\endgroup$
    – Cedron Dawg
    Jul 30, 2020 at 17:34
  • $\begingroup$ That is not a pure thermal image. It looks like the thermal colors are superimposed on a greyscale image from a regular camera. $\endgroup$
    – Justme
    Jul 30, 2020 at 21:56
  • $\begingroup$ Ummm, I’m a bit out of my depth but... contact Flir? $\endgroup$
    – Dan Szabo
    Jul 30, 2020 at 23:34
  • $\begingroup$ @CedronDawg what is T function and how to implement it $\endgroup$
    – rizwan
    Aug 3, 2020 at 7:57
  • $\begingroup$ @Justme this is a pure FLIR image taken by FLIR camera $\endgroup$
    – rizwan
    Aug 3, 2020 at 7:58

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