| US 7,551,805 B2 | ||
| Converting the resolution of an image using interpolation and displaying the converted image | ||
| Kenji Namie, Kanagawa-ken (Japan); Kenji Kameyama, Kanagawa-ken (Japan); and Toshiharu Murai, Kanagawa-ken (Japan) | ||
| Assigned to Ricoh Company, Ltd., Tokyo (Japan) | ||
| Filed on Jul. 13, 2005, as Appl. No. 11/179,850. | ||
| Claims priority of application No. 2004-206408 (JP), filed on Jul. 13, 2004; and application No. 2005-039603 (JP), filed on Feb. 16, 2005. | ||
| Prior Publication US 2006/0013499 A1, Jan. 19, 2006 | ||
| Int. Cl. G06K 9/32 (2006.01) | ||
| U.S. Cl. 382—300 | 42 Claims |
| 1. A method of converting resolution of an image, comprising using a processor to perform the steps of:
specifying an interpolated pixel to be added to the image;
selecting a plurality of reference pixels from a vicinity of the interpolated pixel;
obtaining a distance value for each of the reference pixels;
extracting a pixel value for each of the reference pixels;
generating a weighting factor for a target reference pixel selected from the plurality of reference pixels, using the distance
value and the pixel value of the target reference pixel; and
adding, to the image, the interpolated pixel having a pixel value determined by the weighting factor of the target reference
pixel,
wherein the generating step comprises the step of:
calculating, for the target reference pixel, a pixel value difference between the pixel value of the target reference pixel
and a first predetermined value; and
normalizing the pixel value difference with a normalization factor.
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