US 11,876,934 B2
Image reading apparatus for detecting multifeeding an interrupting or stopping the reading, and image reading method
Kazuya Takita, Shimonoseki (JP)
Assigned to Seiko Epson Corporation, Tokyo (JP)
Filed by Seiko Epson Corporation, Tokyo (JP)
Filed on Feb. 7, 2022, as Appl. No. 17/650,142.
Claims priority of application No. 2021-018867 (JP), filed on Feb. 9, 2021.
Prior Publication US 2022/0256041 A1, Aug. 11, 2022
Int. Cl. H04N 1/00 (2006.01)
CPC H04N 1/00013 (2013.01) [H04N 1/00037 (2013.01); H04N 1/00657 (2013.01); H04N 1/00737 (2013.01); H04N 1/00745 (2013.01); H04N 1/00771 (2013.01); H04N 1/00777 (2013.01); H04N 1/00811 (2013.01); H04N 1/00824 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An image reading apparatus, comprising:
a reading unit that reads a document;
a background plate that serves as a background of the document; and
a multifeeding detecting unit that detects multifeeding of the document, and
a control unit, wherein
the control unit is configured to cause the reading unit to read a shadow, generated at the background plate, of the document, and
the control unit is configured to not determine occurrence of multifeeding when the multifeeding detecting unit detects multifeeding and a pixel value of the read shadow exceeds a predetermined threshold value, and
to determine occurrence of multifeeding when the multifeeding detecting unit detects multifeeding and the pixel value of the read shadow does not exceed the predetermined threshold value.