| US 7,570,825 B2 | ||
| Method and device for determining a data configuration of a digital signal of an image | ||
| Jeanne Guillou, Rennes (France); and Patrice Onno, Rennes (France) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Dec. 11, 2003, as Appl. No. 10/732,484. | ||
| Claims priority of application No. 02 15644 (FR), filed on Dec. 11, 2002. | ||
| Prior Publication US 2004/0165779 A1, Aug. 26, 2004 | ||
| Int. Cl. G06K 9/36 (2006.01); G06K 9/46 (2006.01) | ||
| U.S. Cl. 382—240 [382/166; 382/248] | 14 Claims |
| 1. A method of determining a data configuration of a digital signal of an image, the signal having undergone at least one
spatio-frequential transformation in a plurality of resolution levels, characterized in that the method comprises the following
steps:
determining at least two minimum rate reductions (Dmin) as proportions of the total data rate of at least one resolution level of the signal, each as a function of a quality mode
desired for the signal,
distributing, over several of the plurality of the resolution levels of the signal, a rate reduction (D) greater than or equal
to one of the minimum rate reductions (Dmin) and which is such that the reduction in data rate distributed in each resolution level is less than or equal to a threshold
representing a given quality mode,
adding at least one marker describing the distribution of the reduction in data rate; and
wherein the determining, the distributing and the adding steps are performed using a computer.
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