US 12,081,711 B2
Medium conveying apparatus for determining whether a conveyed medium is ID card
Masaaki Sakai, Kahoku (JP)
Assigned to PFU LIMITED, Kahoku (JP)
Filed by PFU LIMITED, Kahoku (JP)
Filed on Apr. 29, 2022, as Appl. No. 17/733,943.
Application 17/733,943 is a continuation of application No. 16/985,055, filed on Aug. 4, 2020, granted, now 11,363,153.
Claims priority of application No. 2019-167528 (JP), filed on Sep. 13, 2019.
Prior Publication US 2022/0256047 A1, Aug. 11, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 1/04 (2006.01); H04N 1/00 (2006.01)
CPC H04N 1/00748 (2013.01) [H04N 1/0057 (2013.01); H04N 1/0071 (2013.01); H04N 1/00724 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A medium conveying apparatus comprising:
a conveying roller to convey a medium;
an imaging device to generate an input image acquired by imaging the conveyed medium; and
a processor to
extract edge pixels from the input image,
detect two straight lines substantially perpendicular to each other from the edge pixels,
determine whether the conveyed medium is a predetermined card based on a distance between an intersection of the two straight lines and predetermined edge pixels at a corner of the medium in the input image, and
control the conveying roller based on a result of the determination or outputs the result of the determination.