| US 7,522,778 B2 | ||
| Image decoding technique for suppressing tile boundary distortion | ||
| Tooru Suino, Kanagawa (Japan); and Hiroyuki Sakuyama, Tokyo (Japan) | ||
| Assigned to Ricoh Company, Ltd., Tokyo (Japan) | ||
| Filed on Oct. 31, 2007, as Appl. No. 11/980,580. | ||
| Application 11/980580 is a continuation of application No. 10/600333, filed on Jun. 23, 2003, granted, now 7,330,596. | ||
| Claims priority of application No. 2002-208107 (JP), filed on Jul. 17, 2002; application No. 2002-208156 (JP), filed on Jul. 17, 2002; and application No. 2002-267692 (JP), filed on Sep. 13, 2002. | ||
| Prior Publication US 2008/0131013 A1, Jun. 05, 2008 | ||
| Int. Cl. G06K 9/36 (2006.01); G06K 9/46 (2006.01) | ||
| U.S. Cl. 382—240 [382/232; 382/233; 382/236; 382/245; 382/246] | 18 Claims |
| 1. An image decoder successively decoding a plurality of frames of an image, the frames each being hierarchically compressed
and encoded through discrete wavelet transform on pixel values of each of tiles into which the frame is divided, the image
decoder comprising:
a tile boundary smoothing part configured to smooth a distortion of a tile boundary in each of the decoded frames;
a mode selection part configured to select one of a first mode giving priority to image quality and a second mode giving priority
to processing speed in the smoothing of the distortion of the tile boundary by the tile boundary smoothing part; and
a tile boundary smoothing switching part configured to switch between the first mode and the second mode based on the selection
by the mode selection part in the smoothing of the distortion of the tile boundary by the tile boundary smoothing part.
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