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Document reading apparatus and image processing method

A technology for document reading and image processing, used in image communication, electrical components, etc.

Active Publication Date: 2014-01-22
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, no match can be obtained from the comparison between the density when the document did not pass the read position and the density when the document passed the read position
As a result, this dust is not detected as streak pixels

Method used

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  • Document reading apparatus and image processing method
  • Document reading apparatus and image processing method
  • Document reading apparatus and image processing method

Examples

Experimental program
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Embodiment Construction

[0024] figure 1 is a sectional view illustrating an image reading device according to an exemplary embodiment of the present invention. The image reading apparatus includes an image reading device 101 and an automatic document feeder 102 . The automatic document feeder 102 includes a document tray 104 , a transport unit for transporting documents, and a sheet discharge tray 117 . The document 103 placed on the document tray 104 is conveyed to the separation unit by the pickup roller 106 . Then, the separation pad 107 and the separation roller 108 separate the uppermost sheets of the document bundle from the document bundle one by one. At this time, the width adjusting plate 105 abuts against the document 103 placed on the document tray 104, thereby preventing the document 103 from being conveyed in a skewed state. The skew of the separated document 103 is corrected by the first registration roller 109 . Then, the document 103 is conveyed to the reading position by the seco...

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Abstract

The invention discloses a document reading apparatus and an image processing method. The document reading apparatus includes a reading unit configured to read the document being conveyed at a reading position, a white member disposed opposite the reading position, a reference value determination unit configured to determine a reference value from an output value of the reading unit obtained when the reading unit reads the white member, a detection unit configured to detect a shadow generated by a leading edge of the document from the reference value and an output value of the reading unit obtained before the leading edge of the document is conveyed, a streak pixel position determination unit configured to determine a streak pixel position from an output value of the reading unit corresponding to a position of the document which is determined based on a detection result by the detection unit, and a correction unit configured to perform a streak correction based on the streak pixel position.

Description

technical field [0001] The present invention relates to techniques for performing streak correction on image data of a document. Background technique [0002] Image reading devices using automatic document feeders are known. An image reading device using an automatic document feeder conveys documents placed on a document tray one by one, and simultaneously reads images of the conveyed documents at a reading position. These image reading devices read images at a constant reading position, so streaks in the read image tend to occur when dust such as paper dust, dirt, and fine particles carried by document conveyance adhere to the reading position generate. [0003] The image reading device discussed in Japanese Patent Application Laid-Open No. 2005-45462 acquires read data when the document has not passed the reading position, read data of the leading edge portion and rear edge portion of the document, and Read data of the main area (area other than the front edge portion a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/38
Inventor 田中滋人
Owner CANON KK
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