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Image processing apparatus, image processing method, and computer program product

By using two line sensors arranged in parallel to detect the edge coordinates of the original in a paper-through image reading device, the problems of large equipment size and long processing time in the existing technology are solved, and accurate detection of original tilt and cost reduction are achieved. .

Inactive Publication Date: 2009-10-28
RICOH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the image recognition processing is executed by software, the processing time increases, and when the image recognition processing is executed by hardware, a large-scale and complicated circuit is required
Furthermore, when the character line printed on the original is initially inclined with respect to each side of the original, the inclination of the original cannot be accurately detected.

Method used

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Embodiment Construction

[0028] Exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The present invention is not limited to the following examples. The drawings are merely schematic diagrams, and actual dimensions or actual ratios between components are not considered in the drawings. Also, in the drawings, the size or ratio of the same component is not uniform.

[0029] figure 1 is a functional block diagram of the image processing apparatus 100 according to the embodiment of the present invention. The image processing apparatus 100 includes a controller 110, a reading unit 120, a tilt detection unit 130, an operation unit 140, a random access memory (RAM) 150, a read only memory (ROM) 160, and a storage unit connected to each other via an internal bus 180. 170.

[0030] The controller 110 functions as a processor that controls operations of the reading unit 120 , the tilt detection unit 130 , and the operation unit 140 . ...

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Abstract

A first line sensor optically reads a first surface of an original in a main scanning direction to obtain first line image data. A second line sensor arranged in parallel to the first line sensor at a predetermined distance optically reads a second surface of the original to obtain second line image data. A tilt detecting unit detects main-scanning coordinates of a first edge and a second edge from the first line image data, detects main-scanning coordinates of a third edge and a fourth edge from the second line image data, and detects a tilt of the original with respect to a sub-scanning direction based on the detected main-scanning coordinates.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Japanese Priority Document No. 2008-115238 filed in Japan on Apr. 25, 2008, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a technique for detecting the inclination of a document in a sheet-through type reading apparatus in an image processing apparatus. Background technique [0004] An image reading device mounted on a scanner, facsimile, or digital multifunction peripheral is generally configured as a flat head type or a sheetthrough type depending on a method of reading originals. Specifically, the head type image reading apparatus scans the entire original by moving a line sensor when the original is placed at a fixed position. On the other hand, the paper-through type image reading apparatus scans the entire original by moving the original when the line sensor is placed at a fixed position. Recentl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/04
CPCH04N1/00758H04N1/00681H04N1/00705H04N1/00745H04N1/00766H04N1/00785H04N1/00779H04N1/00718H04N1/12
Owner RICOH CO LTD