A new second generation advanced thermal imager, which can be used for battle tank sight has been developed by ADD. This system uses a $480 imes6$ TDI HgCdTe detector, operating in the $7.7-10.3{mu}m$ wavelength made by Sofradir. The IR optics has dual field of views such as $2.67 imes2^{circ}$ in NFOV and $10 imes7.5^{circ}$ in WFOV. And also, this optics is used for athermalization of the system. It is certain that our sensor can be used in wide temperature range without any degradation of the system performance. The scanning system to be able to display 470,000 pixels is developed so that the pixel number is greatly increased comparing with the first generation thermal imaging system. In order to correct non-uniformity of detector arrays, the two point correction method has been developed by using the thermo electric cooler. Additionally, to enhance the image of low contrast and improve the detection capability, we have proposed the new technique of histogram processing being suitable for the characteristics of contrast distribution of thermal imagery. Through these image processing techniques, we obtained the highest quality thermal image. The MRTD of the LWIR thermal sight shows good results below 0.05K at spatial frequency 2 cycles/mrad at the narrow field of view.