Image reading apparatus for detecting multifeeding an interrupting or stopping the reading, and image reading method
AssigneeSeiko Epson Corporation
InventorKazuya Takita
Life of this patent
Estimating the term…
Abstract
A reading unit is configured to capture an image of a shadow generated at a leading end of a document, and a control unit is configured to estimate a thickness of the document based on a pixel value of the shadow. A multifeeding error is displayed on a display unit when it is determined as thin paper in a thick paper determination. The control unit turns multifeeding detection to OFF and stands by until a feeding is completed, and upon completion, returns the multifeeding detection to ON.
Claims13
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.
An image reading apparatus, comprising:
- a reading unit that reads a document;
- a background plate that serves as a background of the document;
- a multifeeding detecting unit that detects multifeeding of the document;
- an operation unit that accepts a setting operation, 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,
- to accept, by the operation unit, an operation specifying a thickness of the document, and
- to not perform multifeeding detection by the multifeeding detecting unit when an accepted thickness corresponds to thick paper.
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.
An image reading method of an image reading apparatus comprising
- a reading unit that reads a document;
- a background plate that serves as a background of the document;
- a multifeeding detecting unit that detects multifeeding of the document;
- an operation unit that accepts a setting operation, and
- a control unit, wherein
- the method comprising:
- causing the reading unit to read a shadow, generated at the background plate, of the document;
- accepting, by the operation unit, an operation specifying a thickness of the document, and
- stopping detecting multifeeding by the multifeeding detecting unit when an accepted thickness corresponds to thick paper.
Dependencies are inferred from the claim text.