Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1986-07-15
1987-10-13
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
382 65, 382 58, 235454, G06K 710
Patent
active
047000783
ABSTRACT:
Tire information marks for denoting tire kind, tire size, etc. formed in a surface of side wall of tire as protrusion or groove having a triangular cross section are optically detected by illuminating the surface of side wall of tire from a first direction substantially perpendicular to the surface of side wall of tire and a second direction inclined with respect to the surface of side wall of tire, and picking up an image of the surface of side wall of tire thus illuminated from the two different directions to derive an image signal. The image signal thus derived is converted into a bivalent signal, and is thinned to produce a mark pattern. Then the mark pattern is compared with a thick standard mark pattern. When a substantial part of the detected mark pattern is included in the standard mark pattern, the detected mark pattern is recognized to be identical with the standard mark pattern.
REFERENCES:
patent: 3163746 (1964-12-01), Hoeser
patent: 3210729 (1965-10-01), Lozier, Jr. et al.
patent: 3781798 (1973-12-01), Hinks
patent: 3930141 (1975-12-01), Koyama et al.
patent: 4549206 (1985-10-01), Suzuki et al.
Marumoto Yoshio
Mizuno Tetsuo
Yamada Kouji
Bridgestone Corporation
Nelms David C.
Seo Chung K.
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