IMAGE READING APPARATUS, IMAGE FORMING APPARATUS, METHOD FOR DETECTING FOREIGN SUBSTANCE, AND CARRIER MEANS

IMAGE READING APPARATUS, IMAGE FORMING APPARATUS, METHOD FOR DETECTING FOREIGN SUBSTANCE, AND CARRIER MEANS

An image reading apparatus includes a light source (210; 310) configured to emit at least light in a first wavelength range and light in a second wavelength range different from the first wavelength range, a background member (240; 270) having different light reflectances in the first wavelength ran...

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Hauptverfasser: INUKAI, Yoshihiro, SUGAI, Atsushi
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
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creator INUKAI, Yoshihiro
SUGAI, Atsushi
description An image reading apparatus includes a light source (210; 310) configured to emit at least light in a first wavelength range and light in a second wavelength range different from the first wavelength range, a background member (240; 270) having different light reflectances in the first wavelength range and the second wavelength range, an imaging device (220; 320), and a foreign substance detection unit (411; 412). The imaging device (220; 320) receives reflected light from the background member (240; 270) irradiated with the light in the first wavelength range, and generates first read information. The imaging device (220; 320) further receives reflected light from the background member (240; 270) irradiated with the light in the second wavelength range, and generates second read information. The foreign substance detection unit (411; 412) detects presence or absence of a first foreign substance, based on a difference in reading level of the first read information generated by the imaging device (220; 320), and detects presence or absence of a second foreign substance, based on a difference in reading level of the second read information generated by the imaging device (220; 320).
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subjects ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
title IMAGE READING APPARATUS, IMAGE FORMING APPARATUS, METHOD FOR DETECTING FOREIGN SUBSTANCE, AND CARRIER MEANS
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