Title:
PRINTING INSPECTION DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/071188
Kind Code:
A1
Abstract:
With regard to a printing inspection device that reads, as a multi-level image, an image that includes a two-dimensional code printed by a general-purpose printer such as an inkjet printer, creates a binary image from the multi-level image by using a prescribed binarization threshold value, and then carries out decoding, the objective of the present invention is to obtain a printing inspection device capable of obtaining an optimal binarization threshold value. Prior to an actual printing inspection a reading test is executed. This reading test is carried out by carrying out a binarization of a multi-level image for one or more inspection samples while using a lightness value for all of the gradations as a threshold value, and obtaining a range (maximum value, minimum value) for a readable lightness value, after which a median value between the minimum value and the maximum value is used as the binarization threshold value for the two-dimensional code image in the actual printing inspection.
Inventors:
SATO TAKASHI (JP)
WATANABE MUNEAKI (JP)
KURIHARA HIROKO (JP)
WATANABE MUNEAKI (JP)
KURIHARA HIROKO (JP)
Application Number:
PCT/JP2019/037463
Publication Date:
April 09, 2020
Filing Date:
September 25, 2019
Export Citation:
Assignee:
HITACHI INDUSTRY EQUIPMENT SYSTEMS CO LTD (JP)
International Classes:
G06K7/14; G06K7/10; G06T7/00
Foreign References:
| JP2005165949A | 2005-06-23 | |||
| JP2016218816A | 2016-12-22 | |||
| JP2009032202A | 2009-02-12 | |||
| JP2009070061A | 2009-04-02 |
Other References:
See also references of EP 3862913A4
Attorney, Agent or Firm:
TODA Yuji (JP)
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