印字検出装置 - Oki Information Systems Co., Ltd.

Title:

印字検出装置

Document Type and Number:

Japanese Patent JP4384791

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To reliably detect the prints of a passbook or the like with a color image sensor. SOLUTION: A reference medium printed with characters in the density of a decision criterion is read by the color image sensor 11 and converted into R, G, B data of digital values by ADC(analog-to-digital converters) 12a-12c. The maximum level value MAX for every picture element is detected by a maximum value detecting circuit 14, and an achromatic color/color decision is made by a color decision circuit 15. The frequency distribution of the achromatic color picture element density is generated by a frequency distribution generating circuit 22, and a reference value slice is decided based on this frequency distribution and registered on a flash memory 19. The image of the passbook 2 is read by the color image sensor 11, and the density of the achromatic color picture elements is compared with the reference value slice by a CPU 20 to detect the presence or absence of the prints on the passbook 2.

Inventors:

Masafumi Mogi
Masashi Mataga

Application Number:

JP2000198122A

Publication Date:

December 16, 2009

Filing Date:

June 30, 2000

Export Citation:

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