Method and apparatus for equalizing the gain of multi-channel sy

Details Method and apparatus for equalizing the gain of multi-channel sy Method and apparatus for equalizing the gain of multi-channel sy

1992-03-24

1993-09-14

Powell, Mark R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358166, 358174, 2502521, H04N 533

Patent

active

052454258

ABSTRACT:
Image restoration methods and systems include a comparison of the outputs of two or more adjacent detector element channels in order to determine the relative responsivities or conversion gains of these channels and to adjust the conversion gains of the two channels to make them substantially equal. These methods include determining the variance for each individual channel's output, and the covariance for each pair of adjacent channel outputs; comparing the values to determine if differences in the variances result from differences in radiant input signals to the channels or from differences in the conversion gains of the channels; and adjusting the conversion gains of the channels as necessary until they are substantially equal.

REFERENCES:
patent: 4712010 (1987-12-01), Alm
patent: 4821337 (1989-04-01), Alm
patent: 4835606 (1989-05-01), Peck
patent: 4868389 (1989-09-01), Moore
patent: 4948964 (1990-08-01), Gohlke
patent: 4963963 (1990-10-01), Dorman
patent: 5101271 (1992-03-01), Andrews et al.

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