公开(公告)号：EP3862913A1

公开(公告)日：2021-08-11

申请号：EP19869212.1

申请日：2019-09-25

申请人： HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD.

发明人： SATO, Takashi ,  WATANABE, Muneaki ,  KURIHARA, Hiroko

IPC分类号： G06K7/14 ,  G06K7/10 ,  G06T7/00

摘要： To obtain a printing inspection device that an optimum binarization threshold value in the printing inspection device that captures an image including a two-dimensional code printed by a general-purpose printer such as an ink jet printer, as a multi-level image, creates a binary image from the multi-level image with a predetermined binarization threshold value, and then performs decoding. Before a practical printing inspection is performed, a read test is performed. The read test is performed on one or more inspection samples by binarizing a multi-level image with brightness values for all gradations as a threshold value. A range (maximum value and minimum value) of readable brightness values is obtained, and then a median value between the minimum value and the maximum value is used as a binarization threshold value for a two-dimensional code image in a practical printing inspection.