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A Method for Thresholding and Correction of Skew in Camera Document Images

  • Journal of The Korea Society of Computer and Information
  • Abbr : JKSCI
  • 2005, 10(3), pp.143-150
  • Publisher : The Korean Society Of Computer And Information
  • Research Area : Engineering > Computer Science

장대근 1 Byung-Tae Chun 2

1특허청 통신 사무관
2한경대학교

Candidate

ABSTRACT

Camera image is very sensitive to illumination that result in difficulties for recognizing character. Also Camera captured document images have not only skew but also vignetting effect and geometric distortion. Vignetting effect make it difficult to separate characters from the document images. Geometric distortion, occurred by the mismatch of angle and center position between the document image and the camera, make the shape of characters to be distorted, so that the character recognition is more difficult than the case of using scanner. In this paper, we propose a method that can increase the performance of character recognition by correcting the geometric distortion of document images using a linear approximation which changes the quadrilateral region to the rectangle one. The proposed method also determine the quadrilateral transform region automatically, using the alignment of character lines and the skewed angles of characters located in the edges of each character line. Proposed method, therefore, can correct the geometric distortion without getting positional information from camera.

Citation status

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