Exposure compensation for a line scan camera

Details Exposure compensation for a line scan camera Exposure compensation for a line scan camera

1989-01-24

1990-04-24

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358486, 358496, H04N 140

Patent

active

049204297

ABSTRACT:
A scanning imager is described which includes a line camera and a table to mechanically present successive regions of an item to be imaged. The time of exposure of the camera for each successive region presented is controlled by encoding strips connected to the table. Thus, if the table is subjected to motion variations, the encoding strips are likewise affected and vary the exposure time for each analog image pixel scan. To compensate, an exposure correction system is provided which includes an analog voltage generator whose output is related to each successive region exposure time. An A to D conversion circuit is responsive to the analog voltage to normalize the analog image value from the camera so that, in effect, equal exposure images result.

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