An Improved Two-Point-Correction Method to Remove the Effect of the Radiance from Camera Interior on Infrared Image

Radiance coming from the interior of an uncooled infrared camera has a significant effect on infrared image. This paper presents a three-phase scheme for coping with the effect. The first phase requires the infrared images of the high temperature blackbody and the low temperature blackbody for various camera interior temperatures. The second phase forms functions of pixel values in the high and low temperature blackbody images with camera interior temperature by least square fitting. With the aid of functions, the third phase determines the high and low temperature blackbody images from the camera interior temperature, and then removes the effect of radiance from the interior of the camera on infrared image. Theory analysis and experiment results show that the method can remove the effect effectively.