Automatic contrast and brightness control for thermal image appa

Details Automatic contrast and brightness control for thermal image appa Automatic contrast and brightness control for thermal image appa

1993-03-30

1994-02-15

Powell, Mark R.

X-ray or gamma ray systems or devices

Electronic circuit

With display or signaling

348678, 348687, H04N 533, H04N 5235, H04N 557

Patent

active

052871762

ABSTRACT:
A process for the automatic contrast and brightness control for thermal imaging apparatus of FLIR systems which is used for forming the actual value of the contrast and brightness of an evaluation window, fixing the shape of the evaluation window and displacing the position of the evaluation window in dependence on the content of the FLIR image, includes: utilizing "n" vertical image columns for evaluation of the FLIR image, converting the average brightness of the FLIR image into an analog voltage signal, comparing the analog voltage signal with a video signal of the FLIR image, summing the results of the comparison in the vertical image columns of the FLIR image such that a sum value results for each image column, determining the position of the horizon from the amounts of the sum values, and in the case of column sums that differ from each other, determining the optimum position of the evaluation window in the horizontal direction from the sum values of the columns such that the surface center of gravity of the evaluation window lies on the column with the maximum column sum, and determining the optimum position of the evaluation window in the vertical direction from this column sum such that the uppermost boundary of the evaluation window in this column does not exceed the determined height of the horizon.

REFERENCES:
patent: 3953667 (1976-04-01), Layton et al.
patent: 4618892 (1986-10-01), Kawaguchi
patent: 5083204 (1992-01-01), Heard et al.
patent: 5091779 (1992-02-01), Ams et al.
patent: 5225903 (1993-07-01), Wittrin

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