Method for correcting direction of document image

Image analysis – Image transformation or preprocessing – Changing the image coordinates

Utility Patent

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Details

C382S297000

Utility Patent

active

06169822

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for correcting the direction of a document image, and more particularly, to a method for automatically correcting a document image direction based on character recognition.
2. Description of the Related Art
In general, character recognition obtains text information by reading a document image through an image input device such as a scanner or a camera, extracting characters from a character area using a computer, and recognizing the extracted characters. However, when characters of the document image are recognized, the document image may be read upside down or rotated 90° clockwise or counterclockwise. In this case, a user conventionally corrects the direction of the document manually and then character recognition is resumed. Further, in automatically processing a large quantity of documents including an image document positioned in a wrong direction, document images not read in a correct direction cannot be recognized.
SUMMARY OF THE INVENTION
To solve the above problems, it is an object of the present invention to provide a method for automatically processing a large quantity of documents and recognizing a document read in an incorrect direction by automatically correcting the image document.
To achieve the above object, there is provided a document image direction correcting method for automatically correcting the angle of a document image, comprising the steps of: (a) detecting a predetermined portion of a character area in the document image; (b) determining the angle of the document according to the character recognition reliability of the predetermined portion of the step (a); and (c) recognizing a character by rotating the document at the angle determined in the step (b).


REFERENCES:
patent: 5020117 (1991-05-01), Ooi et al.
patent: 5077811 (1991-12-01), Onda
patent: 5235651 (1993-08-01), Nafarieh
patent: 5471549 (1995-11-01), Kurosu et al.
patent: 2-79184 (1990-03-01), None
patent: 6-103411 (1994-04-01), None
patent: 8-212298 (1996-08-01), None

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