Boots – shoes – and leggings
Patent
1989-12-21
1992-01-14
Black, Thomas G.
Boots, shoes, and leggings
36457102, 36457104, 364581, G06F 1520
Patent
active
050815970
ABSTRACT:
In accordance with the present invention, correction factors for dynamically equalizing the optical channels of a multichannel optical imaging system, individually or on a group-by-group basis, are recursively computed while the imaging system is idle (i.e., not printing) through the use of an iterative process comprising the steps of: measuring the output intensities of the respective sets of channels, sequentially comparing the measured channel intensities against a system calibrated reference intensity level, and adjusting the correction factor for each set of channels that is found to be operating at an intensity level deviating from the reference intensity level in the direction that is required to reduce the magnitude of the deviation (unless the correction factor value already is at the limit of its dynamic range in that direction). Preferably, the correction factor adjustments are made by incrementing and decrementing their least significant values, thereby maximizing the sensitivity of each iteration of the process to the affect of the immediately preceding iteration on the amount of crosstalk occurring between neighboring sets of channels. For example, the correction factors suitably are multi-bit binary values which are adjusted by incrementing and decrementing their least significant bits (LSB's). The reference intensity level typically is calibrated by measuring the uncorrected output intensities of the respective sets of channels and by then selecting the intensity of the set of channels which is determined to be operating at the lowest valid intensity level for use as the reference intensity. Advantageously, this calibration procedure is repeated on a predetermined schedule for recalibrating the reference level from time-to-time to correct for gradual drift in the optical characteristics of the imaging system.
REFERENCES:
patent: 4636039 (1987-01-01), Turner
patent: 4809194 (1989-02-01), Crookshanks
patent: 4956796 (1990-09-01), Rogers et al.
Black Thomas G.
Ramirez Ellis B.
Xerox Corporation
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