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Method-and-apparatus-for-producing-compensated-signals-for-individual-light-sensors-arranged-in-a-predetermined-relation

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Method and apparatus for producing compensated signals for individual light sensors arranged in a predetermined relation

Details

Inventors: Althauser, William E.; Barnes, Richard A.;
Assignee: International Business Machines Corporation (Armonk, NY)
Primary Examiner: Boudreau; Leo H.
Assistant Examiner:
Attorney, Agent or Firm: Leach, Jr.; Frank C.

The output signal from each light sensor of a solid state array is compensated for variations due to dark scan noise levels, which are due to fixed pattern noise and sensor leakage, produced by the individual light sensors and variations in the light conditions to which the light sensors are subjected. Each of the output signals also can have its threshold level reduced through removing a portion of the signal caused by an output produced by the light sensor when it is scanning a black document. The compensation signals for the noise level variations and the light condition variations are obtained for each of the light sensors separately. The changing in the threshold level due to the black level can be the same for each of a group of the light sensors.

DETAILED DESCRIPTION What is claimed is: 1.
A method for compensating for noise level variations in individual light sensors arranged in a predetermined relation and for variations in light conditions to which the sensors are subjected including: producing a separate output signal from each of the individual light sensors in accordance with the level of light received by each of the individual light sensors; correcting each of the separate output signals from each of the individual light sensors for a noise level variation of the same individual light sensor to produce a sensitivity compensated signal for each of the individual light sensors; correcting each of the sensitivity compensated signals for variations in light conditions to which each of the individual light sensors is subjected to produce a compensated signal for each of the individual light sensors; and changing the compensated signal for each of the individual light sensors in accordance with the variation caused by a black area in the presence of illumination.
2.
The method according to claim 1 including: storing a correction signal for each of the individual light sensors for variations in light conditions to which the individual light sensor is subjected; and utilizing the correction signal for each of the individual light sensors in conjunction with the sensitivity compensated signal for the same individual light sensor to produce the compensated signal for the same individual light sensor.
3.
The method according to claim 2 including obtaining each of the correction signals for variations in light conditions by subjecting each of the individual light sensors to a substantially uniform white area.
4.
The method according to claim 3 including: obtaining the changed signal for each of a selected number of the individual light sensors by subjecting at least one of the selected number of the individual light sensors to the black area in the presence of illumination; and determining the magnitude of the changed signal by determining the magnitude of the compensation signal from the one light sensor of the selected number of the individual light sensors

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