DECODING METHOD AND DECODING PROCESSING DEVICE

WIPO Patent Application WO/2012/002335

A1

Disclosed is a decoding method in which light reflected from a code image is subjected to photoelectric conversion, a read signal indicating the intensity of the reflected light is generated, and the generated read signal is differentiated to generate a differential signal. Taking this as a precondition, points of inflection in the intensity of the reflected light of the read signal are detected from the generated differential signal, and peak levels are detected which constitute extremal values of the intensity of the reflected light and correspond to the width length between the detected points of inflection. Differences between the detected peak levels are obtained and threshold values (ThB2, ThS2) for decoding the read signal are then set from the obtained peak level differences. Decoding can therefore be achieved for a read signal of a code image having degraded printing quality due to the adhesion of dirt etc., or for a read signal that has been read in a de-focused state.

KIMURA Kazuto (12-17, Tsukagoshi 4-chome, Warabi-sh, Saitama 02, 〒3350002, JP)
木村　一人 (〒02 埼玉県蕨市塚越４－１２－１７　株式会社オプトエレクトロニクス内 Saitama, 〒3350002, JP)

JP2011/064711

January 05, 2012

June 27, 2011

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Optoelectronics Co., Ltd. (12-17, Tsukagoshi 4-chome Warabi-sh, Saitama 02, 〒3350002, JP)
株式会社オプトエレクトロニクス (〒02 埼玉県蕨市塚越４－１２－１７ Saitama, 〒3350002, JP)
KIMURA Kazuto (12-17, Tsukagoshi 4-chome, Warabi-sh, Saitama 02, 〒3350002, JP)

G06K7/00; G06K7/10

YAMAGUCHI INTERNATIONAL PATENT FIRM (Takamura Building 5F, 3-14-7 Yushima, Bunkyo-k, Tokyo 34, 〒1130034, JP)

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