Image scanning device

Details Image scanning device Image scanning device

1997-06-19

1999-01-05

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359215, 358474, 358494, 250234, G02B 2608

Patent

active

058568794

ABSTRACT:
An image scanning device is provided that includes an imaging lens, a linear image sensor that outputs a line image signal, a rotatable scanning mirror that deflects light towards the image sensor through the imaging lens, a scanning system for rotating the scanning mirror to scan a two-dimensional image, a focusing system that drives the imaging lens according to a position of the scanning mirror to maintain an in-focus image, and a magnification correction system which compensates for changes of magnification of the line image due to the driving of the imaging lens, such that distortion of the two-dimensional image is reduced. In particular, based on the assumption that an object is a flat surface that is perpendicular to an optical axis of the image scanning device, the magnification correction system compensates for the changes of magnification by calculating a difference between a reference magnification and a current magnification, and replaces a corresponding number of pixels from the line image signal with compensation pixels.

REFERENCES:
patent: 5235375 (1993-08-01), Yamana et al.
patent: 5585937 (1996-12-01), Kokubo et al.
patent: 5717200 (1998-02-01), Hashimoto

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