Patent ID: 11876934
Assignee: SEIKO EPSON CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. An image reading method of an image reading apparatus including
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 method comprising:
causing the reading unit to read a shadow, generated at the background plate, of the document;
not determining occurrence of multifeeding when the multifeeding detecting unit detects multifeeding and a pixel value of the read shadow exceeds a predetermined threshold value, and
determining 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.