Apparatus for correcting skew, distortion and luminance when ima

Details Apparatus for correcting skew, distortion and luminance when ima Apparatus for correcting skew, distortion and luminance when ima

1997-08-21

1999-08-17

Boudreau, Leo H.

Image analysis

Image transformation or preprocessing

Changing the image coordinates

382275, 382289, 358496, 358497, G06K 932

Patent

active

059405449

ABSTRACT:
An object of the invention is to correct a distortion due to inclination of a document and to correct a luminance.
First, an edge detection section detects an edge of a document image from a picture obtained by imaging the document. Then, a skew detection section detects a skew of the document from the edge. A rotation correction section causes the picture to rotate on the basis of the skew detected by the skew detection section. Subsequently, the edge detection section again extracts a document image edge from the picture rotated by the rotation correction section. Further, a height calculation section calculates from the edge a height of the document. Simultaneously, a magnification calculation section calculates from the edge a magnification of the picture. Next, a distortion correction section corrects a distortion by magnification/reduction of the picture rotated by the rotation correction section on the basis of the document height and the magnification. Lastly, a luminance correction section corrects the luminance of pixels of the distortion-corrected picture. Whereby, even when the document suffers from skew added thereto, distortion correction and luminance correction can be performed.

REFERENCES:
patent: 5537226 (1996-07-01), Wolberg et al.
patent: 5537494 (1996-07-01), Toh
patent: 5764383 (1998-06-01), Saund et al.
patent: 5805272 (1998-09-01), Nozawa et al.

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