| US 7,483,158 B2 | ||
| Image forming apparatus for forming image on record medium | ||
| Hiromichi Hayashihara, Yokohama (Japan) | ||
| Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan); and Toshiba Tec Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Apr. 16, 2007, as Appl. No. 11/735,731. | ||
| Prior Publication US 2008/0252896 A1, Oct. 16, 2008 | ||
| Int. Cl. H04N 1/028 (2006.01) | ||
| U.S. Cl. 358—1.12 | 9 Claims |
| 1. An image forming apparatus that forms an image on a record medium, comprising:
a light source that irradiates light on the record medium and an image sensor that captures a speckle generated on the record
medium by the light;
an FFT transform unit configured to subject the speckle obtained by this image sensor to fast Fourier transform (FFT);
a storing unit configured to store reference speckle patterns, which are values obtained by subjecting speckles of plural
kinds of record media to fast Fourier transform; and
a control unit configured to determine a type of the record medium by comparing a value obtained by subjecting the speckle
to FFT transform using the FFT transform unit and the reference speckle patterns stored in the storing unit and set a condition
for image formation according to the type of the record medium determined.
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