3D Thermal Imaging: An approach towards true field temperature measurement

There are still many assumptions in the calculation of temperature using infrared cameras, some of which who are dependent on the shape of the observed object and its orientation with the camera. In this paper we address temperature variation occurring as a result of emissivity variance caused by change in the observation angle of an observed object. The camera-object orientation is retrieved by means of 3D reconstruction via a stereo NIR camera rig, which doubles as a redundant thermography system. Examples are given that show the effect of temperature variation with the observation angle variations. We then propose a method for using a modified emissivity measurement method to correct temperature measurement errors dependent on the observation angle.