METHOD AND APPARATUS FOR DETECTING STRIPE DEFECTS OF PRINTED MATTER

Title:

METHOD AND APPARATUS FOR DETECTING STRIPE DEFECTS OF PRINTED MATTER

Document Type and Number:

WIPO Patent Application WO/1998/015919

Kind Code:

A1

Abstract:

A printer matter stripe defect detecting apparatus which detects a stripe defect on a printed matter by examining an inspection image formed by inputting the image of the printed matter comprises an image input unit (10) to which the inspection image of the printed matter is optically inputted, a pattern eliminating unit (12) which eliminates the patterns from the inspection image, a stripe emphasizing unit (14) which subjects the stripes existing in the image from which the patterns are eliminated to an emphasis processing, a judging unit (16) which detects a stripe defect in accordance with the image whose stripes are emphasized, and defect display unit (18) which displays the detected stripe defects on a monitor. With this constitution, the stripe defects can be reliably detected from the inspection image containing patterns even if the stripe defects are very small and of very low contrast.

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Inventors:

SATOU HIROSHI (JP)
SAKATA HIDETO (JP)
SOEDA MASAHIKO (JP)
HAYASHI KENTA (JP)

Application Number:

PCT/JP1997/003611

Publication Date:

April 16, 1998

Filing Date:

October 08, 1997

Export Citation:

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Assignee:

DAINIPPON PRINTING CO LTD (JP)
SATO HIROSHI (JP)
SAKATA HIDETO (JP)
SOEDA MASAHIKO (JP)
HAYASHI KENTA (JP)

International Classes:

B41F33/00; G06T5/00; G06T7/00; (IPC1-7): G06T7/00

Foreign References:

JPH07175926A	1995-07-14
JPH03264359A	1991-11-25
JPS6319078A	1988-01-26
JPH07234933A	1995-09-05

Other References: