Image reading apparatus for reading a color image by irradiating

Details Image reading apparatus for reading a color image by irradiating Image reading apparatus for reading a color image by irradiating

1995-08-18

2000-06-20

Au, Amelia

Image analysis

Color image processing

Color correction

358518, 382323, G06K 900

Patent

active

06078685&

ABSTRACT:
This invention has as its object to provide an image reading apparatus which can prevent color mixing even when a linear image sensor in which charge transfer units are arranged to sandwich light-receiving units of different colors therebetween is used. In order to achieve the object, the image reading apparatus includes: a linear image sensor which is constituted by a plurality of image line sensors (301, 302, 303) respectively having a plurality of color filters, and transfer units (304-309) for transferring charges from the image line sensors, so that a charge obtained by a light-receiving/storage operation of at least one color image line sensor (302) is transferred to the transfer units (306, 307) via the image line sensor (303) of another color; and a subtraction circuit for subtracting a value obtained by multiplying a charge obtained by the light-receiving/storage operation of the image line sensor (303) of the other color with a correction coefficient from the charge transferred via the image line sensor (303) of the other color.

REFERENCES:
patent: 4293871 (1981-10-01), Macovski
patent: 4481522 (1984-11-01), Jastrzebski et al.
patent: 4718768 (1988-01-01), Houki et al.
patent: 5121192 (1992-06-01), Kazui
patent: 5241377 (1993-08-01), Kaneda
patent: 5340977 (1994-08-01), Kojima et al.
patent: 5345320 (1994-09-01), Hirota
patent: 5438364 (1995-08-01), Maeshima et al.
patent: 5508742 (1996-04-01), Geerlings et al.
European Search Report in corresponding foreign application EP95 30 5816 which cites the references disclosed in this Form PTO-1449.

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