Image reading apparatus with varied subscanning speed

Details Image reading apparatus with varied subscanning speed Image reading apparatus with varied subscanning speed

1994-08-11

1996-07-23

Rogers, Scott A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358444, 358447, 358471, 358486, 358494, H04N 104, H04N 1047, H04N 110, H04N 117, H04N 1191

Patent

active

055395325

ABSTRACT:
A scanner having an image sensor unit having a CCD linear array for electro-optically scanning an image of an original in a main scanning direction to convert the image into image data signals is used to scan, through a table sheet having a transparent document area and a pattern area which includes a stripe pattern inclined with respect to the main scanning direction, an original placed under the document area to read data of the original, and the scanner is moved relative to the original in a subscanning direction perpendicular to the main scanning direction. A pattern signal obtained by scanning the pattern area then is analyzed to detect an amount of relative movement of the scanner in the subscanning direction from the movement of the stripe pattern in the main scanning direction. Accordingly, the reading resolution in the subscanning direction which varies depending upon a high or low degree of the speed of relative movement of the scanner in the subscanning direction can be maintained suitably by adjustment of the speed of movement, or the reading speed can be raised for a predetermined resolution.

REFERENCES:
patent: 4641357 (1987-02-01), Satoh
patent: 4860377 (1989-08-01), Ishigaki

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