Registers – Coded record sensors – Particular sensor structure
Patent
1997-01-24
1999-12-28
Hajec, Donald
Registers
Coded record sensors
Particular sensor structure
235455, 23546201, 23546202, 23546226, 23547201, G06K 710
Patent
active
060069902
ABSTRACT:
A imaging based dataform reader utilizes a method of compensating for image offset between consecutive image fields comprising an interlaced image frame. The method includes determination of a disparity vector corresponding to the direction and magnitude of the offset between portions of successive fields. The disparity vector is determined by trial matching feature recognition data for a template area of a second image field to feature recognition data for a reference area of a first image field. The second field feature recognition data is trial matched to first field data at a plurality of offsets typical of hand jittering. The offset position providing the best feature match between the first and second fields is used to derive a disparity vector. The disparity vector is then applied to provide enhanced decoding by use of first field image data and registration-corrected second field image data. Feature recognition is achieved by use of digital filter value sets which may be adapted for recognition of horizontal, vertical or curved feature transitions.
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Title: Metanetics Corporation IR-2000 Hand Held Image Reader User's Guide. To the best of Applicant's knowledge, this publication was published more than one year prior to the filing date of the above-named patent application.
Li C. Jim
Ye Angi
Hajec Donald
St.Cyr Daniel
Telxon Corporation
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