| US 7,558,437 B2 | ||
| Method and apparatus for image processing | ||
| Naoyuki Misaka, Shizuoka-ken (Japan) | ||
| Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan); and Toshiba Tec Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Mar. 15, 2005, as Appl. No. 11/79,891. | ||
| Prior Publication US 2006/0209367 A1, Sep. 21, 2006 | ||
| Int. Cl. G06K 9/38 (2006.01); H04N 1/40 (2006.01); H04N 1/38 (2006.01); H04N 1/04 (2006.01) | ||
| U.S. Cl. 382—275 [358/461; 358/474; 358/463] | 13 Claims |
| 1. An image processing apparatus comprising:
a CCD sensor which includes at least one line sensor, and which performs photoelectric conversion of image information of
a reading object to output an electric signal corresponding to the image information;
an average value computing unit which determines an average value of read values in each line of a reference plate when shading
correction is performed using the read value obtained by reading the reference plate with the CCD sensor;
a comparison computing unit which compares the average value computed by the average value computing unit to data of a next
read position;
a determining unit which determines whether or not foreign matter adheres to the reference plate based on the comparison result
of the comparison computing unit; and
a control unit which repeats the computation of the average value by the average value computing unit, the data comparison
by the comparison computing unit, and the determination by the determining unit up to the necessary number of lines.
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