Registers – Coded record sensors – Particular sensor structure
Patent
1981-01-05
1985-04-30
Yusko, Donald J.
Registers
Coded record sensors
Particular sensor structure
382 12, 382 36, G06K 710
Patent
active
045146225
ABSTRACT:
Disclosed is a method and an apparatus for identifying objects, such as articles sold in a store, appearing in a random position and orientation and at random times on an image window. On a surface facing the image window, each object has an identification in the form of a field which comprises on at least one data track contrasting indicia with at least one contrasting line pattern identifying the position and the orientation of the data track. The track also includes a plurality of parallel lines with variable spacing and/or line widths. The image window is scanned line-by-line to generate a binary video signal which corresponds to the scanned contrast sequence. The length of the overlapping light and dark intervals of the video signal resulting from the scanning of the line pattern is measured and successively measured interval lengths are compared with each other and a comparison signal having a first amplitude is generated when the two interval lengths which are being compared have a predetermined ratio to each other which conforms to the spacing of corresponding pattern lines. An identification signal is emitted when during each of a number of successive comparison steps, the number of which is determined by the contrasting line pattern, a reference signal having the first amplitude is generated.
REFERENCES:
patent: 3906202 (1975-09-01), Meyer
patent: 4020357 (1977-04-01), Punis
patent: 4056710 (1977-11-01), Shepardson
patent: 4059224 (1977-11-01), Seligman
patent: 4086477 (1978-04-01), Cowardin et al.
patent: 4272675 (1981-06-01), Blanford et al.
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patent: 4354101 (1982-10-01), Hester et al.
Kastner Anton
Wevelsiep Klaus
Scantron GmbH & Co.
Yusko Donald J.
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