Thermography is used in a wide range of applications, e.g. in areas such as security, reconnaissance and surveillance. Thermography systems are used, for example, for border controls and for the observation of persons or vehicles. Thermal imaging cameras are also used to secure and optimize the energy efficiency of houses or apartments. Thus, poorly insulated walls are depicted in a strong red. An advantage of thermography systems is, by generating thermal images, they continuously guarantee the best images of the environment, even under the most difficult environmental conditions, such as strong fog or smoke. An increased degree of security can thus be guaranteed, for example, during fire-fighting operations or when monitoring properties. Even in complete darkness, targets and potential danger situations can be identified at an early stage. A further advantage compared to conventional active night vision systems is the immunity to changing lighting conditions: External factors such as local over-radiation or brightest daylight have no influence on the quality of the resulting thermal images.