Process for correcting the intensity of images from a digital in

Details Process for correcting the intensity of images from a digital in Process for correcting the intensity of images from a digital in

1998-04-16

2000-06-13

Rogers, Scott

Image analysis

Image enhancement or restoration

Image filter

382262, 382274, G06T 520, G06K 940

Patent

active

060759038

ABSTRACT:
The invention concerns a process to correct the intensity of images from a digital infrared camera with a two-dimensional detector. First a stationary correction is made at a reference source to determine correction coefficients. For the stationary correction, an average intensity characteristic curve U.sub.av (T) is determined for the detector and compared with the intensity characteristic curve U.sub.j (T) for each image point j of the two-dimensional detector to determine correction coefficients for each image point j. A non-linear formulation is used to adapt the intensity characteristic curve U.sub.j (T) of each image point to the average intensity characteristic curve U.sub.av (T). Correction coefficients are stored in a memory to correct the individual intensity U.sub.j of each image point j during operation. During operation, the correction coefficients are improved dynamically. The intensity Uj of an image is recorded and the intensity Uj of the image is filtered by a locally acting adaptive filter. Then the remaining imaging error is determined using intensity Uj of the unfiltered image and intensity F(Uj) of the filtered image and the correction coefficients are improved using the ascertained remaining imaging error.

REFERENCES:
patent: 4975864 (1990-12-01), Sendall et al.
patent: 5420421 (1995-05-01), Lindgren et al.
patent: 5514865 (1996-05-01), O'Neil
patent: 5606631 (1997-02-01), Weiss et al.

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