Image-scanning apparatus with a shading correction function

Details Image-scanning apparatus with a shading correction function Image-scanning apparatus with a shading correction function

1997-08-28

1999-10-19

Vu, Kim Yen

Image analysis

Image enhancement or restoration

Intensity, brightness, contrast, or shading correction

358406, 358461, 358486, H04N 1407, H04N 140

Patent

active

059701811

ABSTRACT:
An image-scanning apparatus for scanning an original in an image-reading area to output image data, includes, a platen on which the original is placed, a reference plate which has a reference color, and a scanning device for optically scanning the reference plate and the original placed on the platen to provide a first optical image and a second optical image. The image-scanning apparatus also has a receiving device for receiving the first optical image and the second optical image so as to output electrical signals, a setting device for setting a correcting amount on the basis of the electrical signals, a correcting device for correcting the scattering of the electrical signals to output the image data, a calculating device for calculating a pre-running length corresponding to a predetermined speed, the scanning device is accelerated in a pre-running portion corresponding to the pre-running length so that the scanning device reaches the predetermined speed, a determining device for determining that the reference plate is sufficiently included in the pre-running portion, a control system for controlling the scanning device and the setting device corresponding to the detecting operation of the determining device so that the scanning device performs the scanning operation efficiently.

REFERENCES:
patent: 4573787 (1986-03-01), Sanbayashi et al.
patent: 4720729 (1988-01-01), Watanabe
patent: 5206501 (1993-04-01), Sakakibara et al.
patent: 5734758 (1998-03-01), Yamamoto et al.

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