Non uniformity compensation for infrared detector arrays

Details Non uniformity compensation for infrared detector arrays Non uniformity compensation for infrared detector arrays

1997-08-22

1999-07-20

Westin, Edward P.

Radiant energy

Calibration or standardization methods

250332, 2502081, H01J 4014

Patent

active

059258802

ABSTRACT:
Methods of calculating gain correction values and offset correction values for detector elements of an infrared detector array. The methods can be adapted for one-dimensional scanning arrays or for two-dimensional staring arrays. (FIGS. 3 and 6). The array is mechanically dithered so that two or more neighboring detector elements of the array look at the same location of a scene. (FIG. 3, Step 302; FIG. 6, Step 601). Then, the fields of pixel data are processed to calculate a gain correction value and an offset correction value for each detector element. (FIG. 3, Steps 305, 309, and 311; FIG. 6, Steps 603, 607, and 611). For each detector element, its gain error and its offset error are calculated from local averages, with the local average for a particular detector element including a term for that detector element as well as terms for its neighboring detector elements.

REFERENCES:
patent: 5276319 (1994-01-01), Hepfer et al.
patent: 5514865 (1996-05-01), O'Neil

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