Patent ID: 11934713
Assignee: RICOH COMPANY, LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 5:
6. An inspection device, comprising circuitry configured to:
read an inspection target image from a printed matter:
generate a difference image between the inspection target image and a comparison target image;
perform processing on the difference image using a threshold value to perform determination as to whether a defect of the printed matter is present;
calculate a threshold value for show-through at which show-through of the printed matter is not determined as the defect of the printed matter among multiple threshold values based on a result of the determination;
store lateral inversion coordinate information and vertical inversion coordinate information, based on an image to be printed on a front face of the printed matter and another image to be printed on a back face of the printed matter in order to determine the show-through, the lateral inversion coordinate information indicating a range of an image object on the printed matter when the image is laterally inverted and superimposed, the vertical inversion coordinate information indicating a range of an image object on the printed matter when the image is vertically inverted and superimposed; and
calculate the threshold value for show-through by using a coordinate included in the range of the image object indicated by the lateral inversion coordinate information among coordinates determined as the defect of the printed matter in a case of duplex printing in which the image is laterally inverted and superimposed, and calculate the threshold value for show-through by using a coordinate included in the range of the image object indicated by the vertical inversion coordinate information among coordinates determined as the defect of the printed matter in a case of duplex printing in which the image is vertically inversed and superimposed.