Registers – Coded record sensors – Particular sensor structure
Patent
1996-04-01
2000-09-19
Gross, Anita Pellman
Registers
Coded record sensors
Particular sensor structure
235462, 235472, 235494, 371 378, 371 379, G06K 938, G06K 1906
Patent
active
061199370
ABSTRACT:
A threshold determination/binarization circuit and a recording medium for an information reproduction system, wherein the diameter of a reference dot detected by a reference dot diameter detection section is compared with a predetermined dot diameter as a standard value, and the threshold is adjusted such that the difference between the reference dot diameter and the standard value equals a predetermined target value, thereby obtaining the same binarization effect with respect to image signals obtained with different transfer characteristics (different media, recording states, and optical systems). This circuit also includes a maximum/minimum value detection section that detects the maximum and minimum values of an image signal level corresponding to a dot code. A threshold is calculated by using an internal ratio representing the radio between the maximum and minimum values so as to stabilize a reading operation against illumination and recording irregularity, contamination of a dot code, and the like. On a dot code recorded on a recording medium, attribute dots, each containing information associated with the recording medium, are arranged in a predetermined area on the reading start end side to set a threshold for binarization.
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Sonobe Kazuo
Wang Kangda
Gross Anita Pellman
Olympus Optical Co,. Ltd.
Rodriguez Douglas X.
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