Stray light compensation techniques for an infrared camera

摘要

Various techniques are provided for a stray light compensation method for an infrared (IR) camera. For example, a stray light compensation method includes: capturing an IR image of a scene by an IR camera, generating a fixed pattern noise estimate FPNestt0 for time t0 using the captured IR image and a stray light model associated with the IR camera, and performing a fixed pattern noise (FPN) compensation of the captured IR image based on said FPNestt0 to obtain a stray light compensated IR image. The fixed pattern noise estimate may be generated through operations in a frequency domain representation of the captured IR image and the stray light model according to one or more embodiments.

主权项

1. A method comprising:
making a selection from an infrared (IR) image captured by an IR camera, wherein the selection from the IR image includes one or more lines, one or more points, or the whole of the captured IR image; selecting, from each of a plurality of stored stray light images, a portion that corresponds to the selection from the IR image, wherein the stored stray light images were measured during production of the IR camera for at least two different camera temperatures against flat radiators and stored in a memory; low-pass filtering the selection from the IR image; matching the selection from the IR image against the corresponding selected portion of each stored stray light image by calculating a factor which makes the most points from the selection from the IR image and the selected portion of each stored stray light image coincide; determining, as the matched one of the stored stray light images, the stray light image which contains the selected portion that best corresponds to the selection from the IR image; obtaining a stray light map by multiplying the matched one of the stray light images by the calculated factor of the matched one of the stored stray light images; and compensating the captured IR image using the obtained stray light map.