Hybrid mechanical and electronic deskew of scanned images in an

Details Hybrid mechanical and electronic deskew of scanned images in an Hybrid mechanical and electronic deskew of scanned images in an

1992-12-23

1994-05-17

Powell, Mark R.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358475, 358468, 358448, 382 45, H04N 104

Patent

active

053133110

ABSTRACT:
In an image input terminal for deriving an electronic representation of the image, including a platen for supporting a document to be scanned, a scanning system including an illumination source for illuminating a document supported on the platen, an array of photosensitive elements which produce an electrical response to sensed reflected light, an arrangement for directing light reflected from a document to the linear array, and an arrangement for providing relative motion in a slow scan direction between the linear array of photosensitive elements and the document, there is provided an arrangement for rotating the scanning system of photosensitive elements and an illumination source about a rotational axis, by an amount corresponding to detected skew of the image, so that, upon relative movement of the linear array of photosensitive elements and the document, the effects of skew in the slow scan direction are removed from the electronic representation of the image. The scanned image still contains a component of skew in the slow scan direction. Accordingly, each pixel is shifted in the fast scan direction by an amount corresponding to the position of the scan line with respect to a start of page signal.

REFERENCES:
patent: 3812459 (1974-05-01), MacNeill
patent: 4435837 (1984-03-01), Abernathy
patent: 4604161 (1986-08-01), Araghi
patent: 4916483 (1990-04-01), Thompson et al.
A. W. Paeth, "A Fast Algorithm for General Raster Rotation", Graphics Interface '86, p. 77ff. (1986).

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