Facsimile and static presentation processing – Natural color facsimile – Measuring – testing – and calibrating
Patent
1996-02-26
2000-06-06
Lee, Thomas D.
Facsimile and static presentation processing
Natural color facsimile
Measuring, testing, and calibrating
358523, 358406, H04N 146
Patent
active
060726032
ABSTRACT:
A CCD imager which employs multiple outputs to increase frame rates suffers from imbalances between the signal processing electronics of each output. The imbalances may result in an image of unacceptable quality. A method for eliminating image imbalances on multiple output CCD image sensors. Calibration of multi-block image sensors having a block readout format is accomplished employing look up tables (LUTs) that have their values determined during a calibration cycle. A test pattern is placed in front of the sensor and its pattern read into the image sensor. The LUTs have their values determined by comparing charges within cells along the borders of the blocks of the image sensor to corresponding cells along the border for the adjacent block. A polynomial equation is determined via a least square fitting routine for these cells which is then used to determine scaling factors for each block. These scaling factors are stored in the LUTs for each block, at least along the borders for the multi-block image sensor in order to provide for smooth transitions across the borders of the blocks.
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Eastman Kodak Company
Lee Thomas D.
Leimbach James D.
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