Method to correct for sensitivity variation of media sensors
AssigneeLexmark International, Inc.
InventorsMahesan Chelvayohan, Timothy L. Anderson
Life of this patent
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Abstract
A method of correcting for sensitivity variation of media sensors includes the steps of determining a first reflectance ratio of a first calibration media having a first glossiness; determining a second reflectance ratio of a second calibration media having a second glossiness, the second glossiness being greater than the first glossiness and determining a corrected normalized reflectance ratio of an unknown media based on the first reflectance ratio of the first calibration media and the second reflectance ratio of the second calibration media.
Claims15
A method of correcting for sensitivity variation of media sensors, comprising the steps of:
- (a) determining a first reflectance ratio of a first calibration media having a first glossiness;
- (b) determining a second reflectance ratio of a second calibration media having a second glossiness, said second glossiness being greater than said first glossiness;
- (c) determining a corrected normalized reflectance ratio of an unknown media based on said first reflectance ratio of said first calibration media and said second reflectance ratio of said second calibration media.
A method of dynamically correcting for sensitivity variation of media sensors during a determination of a media type of an unknown media using a first media sensor, comprising the steps of:
- determining a first reflectance ratio R0 of a first calibration media having a first glossiness;
- providing a predetermined average normalized reflectance ratio RA of a plurality of normalized reflectance ratios R1, R2, . . . RX for a second calibration media having a second glossiness, said second glossiness being greater than said first glossiness, said plurality of normalized reflectance ratios R1, R2, . . . RX being generated using a plurality of media sensors;
- determining a second reflectance ratio R[HIGH] of said second calibration media;
- determining a reflectance ratio R of said unknown media;
- and
- determining a corrected normalized reflectance ratio of said unknown media based on said first reflectance ratio R0 of said first calibration media, said predetermined average normalized reflectance ratio RA of said second calibration media, said second reflectance ratio R[HIGH] of said second calibration media, and said reflectance ratio R of said unknown media.
A method of determining a corrected normalized reflectance ratio of an unknown media having an unknown media type, comprising the steps of:
- providing a first media sensor for sensitivity correction, said first media sensor being used in determining a reflectance ratio R of said unknown media type;
- selecting a first calibration media having a first glossiness;
- selecting a second calibration media having a second glossiness, said second glossiness being greater than said first glossiness;
- determining a first reflectance ratio R0 of said first calibration media;
- determining a plurality of normalized reflectance ratios R1, R2, . . . RX of said second calibration media;
- calculating an average normalized reflectance ratio RA of said plurality of normalized reflectance ratios R1, R2, . . . RX;
- determining a second reflectance ratio R[HIGH] for said second calibration media;
- and
- determining a corrected normalized reflectance ratio of said unknown media based, in part, on said first reflectance ratio R0 of said first calibration media, said average normalized reflectance ratio RA of said second calibration media and said second reflectance ratio R[HIGH] for said second calibration media.
Dependencies are inferred from the claim text.