Hi Binoy, I am copying this from one of our community posts where a user got these paramters from FLIR (FLIR Duo Pro R - #103 by Cristina_Timofte)
Sensor width (mm) = 7.4mm
Sensor Height (mm) = 5.55mm
Pixel size (um) = 1.85um
Focal length (mm) = 8mm
Principle point x (mm) = 7.4mm/2 = 3.7mm
Principle point y (mm) = 5.55mm/2 = 2.7525mm
The other paramters are read from the EXIF, but the pixel size is not. So that is the parameter you should be careful about and edit if it is auto-filled incorrectly by Pix4D.