Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1991-08-22
1993-10-12
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
35821315, H01J 4014, H04N 314
Patent
active
052528189
ABSTRACT:
Improved linear sensor array and scanner apparatus and operating methods to reduce noise and streaking in a digitized image produced by the scanner. The scanner uses a charge coupled device linear sensor array having a pair of sensor output channels, each for processing one half of the array sensor elements which are interleaved with the other half of the sensor elements. To provide a reference, the CCD outputs are read a plurality of times with the system on but no article in scanning position, with the multiple readings for each sensor element being averaged to provide an average reference level therefor. These averages are stored in digital form, each to provide a calibration factor (multiplier) for the corresponding readings of the array during scanning of an article. During scanning, the output corresponding to each sensor element is multiplied by the corresponding calibration factor to normalize each output to a common reference. Thereafter, the outputs for the first and second sensor element locations are averaged, the outputs for the second and third sensor element locations are averaged, etc. across the entire line to provide the image scan line data, substantially eliminating any lack of tracking between the two output channels.
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Bass James O.
Gerlach Richard K.
Messinger Michael
Nelms David C.
Vision Ten, Inc.
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