Image analysis – Image sensing
Patent
1997-07-01
2000-02-08
Couso, Jose L.
Image analysis
Image sensing
318318, 358505, G06K 700
Patent
active
060235373
ABSTRACT:
An oblique line pattern is located outside of an effective image area and comprises a plurality of lines with a fixed inclination to the main scan direction. A reading unit, extending in the main scan direction, reads the oblique line pattern together with an original image which is placed in the effective image area. A setting portion is provided for an operator to set an image size change rate for the original image. A sub-scanning portion changes an original image scanning speed in a sub-scan direction according to the image size change rate. A first calculating portion sets a window on image data of the oblique line pattern obtained through the reading unit, and calculates a center of gravity of the image data in the window. A controlling portion controls movement of the window according to a value of the center of gravity obtained through the first calculating portion. A second calculating portion obtains an image reading position error for each main scan line based on the value of the center of gravity and the image size change rate.
REFERENCES:
patent: 5402409 (1995-03-01), Kataoka et al.
patent: 5485288 (1996-01-01), Kamei et al.
patent: 5666213 (1997-09-01), Ohshita et al.
Shunsuke Hattori, et al., "A Development of Image Scanner of High Resolution", Japan Society of Mechanical Engineers, lecture paper collection (IV), Mar. 29-31, 1994, Tokyo, pp. 673-675.
Koujiro Ohshima, et al., "Base and Application of Servo Sensor", Feb. 20, 1988, pp. 151-154.
Noguchi Koichi
Wada Shinichiro
Couso Jose L.
Do Anh Hong
Ricoh & Company, Ltd.
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