| US 7,542,081 B2 | ||
| Image input apparatus | ||
| Kazuhito Ohashi, Sunto-gun (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Sep. 26, 2005, as Appl. No. 11/234,099. | ||
| Application 11/234099 is a division of application No. 09/639082, filed on Aug. 16, 2000, granted, now 7,053,941. | ||
| Claims priority of application No. 11-232463 (JP), filed on Aug. 19, 1999; and application No. 2000-016949 (JP), filed on Jan. 26, 2000. | ||
| Prior Publication US 2006/0017819 A1, Jan. 26, 2006 | ||
| Int. Cl. H04N 5/217 (2006.01) | ||
| U.S. Cl. 348—241 [348/243; 348/247] | 5 Claims |
| 1. An image input apparatus comprising:
a photoelectric conversion unit adapted to acquire image information of an object from a plurality of divided areas and to
output signals from each of a plurality of output units corresponding to respective ones of the areas, wherein each of the
areas includes a plurality of effective pixels and a plurality of non-image pixels; and
a correcting unit adapted to correct offset components contained in the signals output from each of the output units during
a period of acquiring image information, in accordance with a first signal output from the plurality of effective pixels during
a period other than the image information acquiring, a second signal output from the plurality of non-image pixels during
the period of acquiring the image information, and an average of the second signal, said correcting unit including:
a subtracting unit adapted to subtract the offset components from the signals output from the plurality of areas of said photoelectric
conversion unit during the period of acquiring the image information;
a calculating unit adapted to calculate the fluctuation of the offset components in accordance with the second signal and
the average of the second signal; and
an adjusting unit adapted to adjust the offset components to be subtracted by said subtracting unit, in accordance with an
output signal from said calculating unit.
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