| US 7,542,510 B2 | ||
| Moving picture predicting method, moving image encoding method and device, and moving image decoding method and device | ||
| Shinya Kadono, Nishinomiya (Japan); Chong Soon Lim, Singapore (Singapore); Teck Wee Foo, Singapore (Singapore); and Sheng Mei Shen, Singapore (Singapore) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Appl. No. 10/500,801 PCT Filed Sep. 04, 2003, PCT No. PCT/JP03/11286 § 371(c)(1), (2), (4) Date Jul. 07, 2004, PCT Pub. No. WO2004/047453, PCT Pub. Date Jun. 03, 2004. |
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| Claims priority of application No. 2002-336294 (JP), filed on Nov. 20, 2002; and application No. 2002-340391 (JP), filed on Nov. 25, 2002. | ||
| Prior Publication US 2005/0047506 A1, Mar. 03, 2005 | ||
| Int. Cl. H04N 7/12 (2006.01); G06K 9/36 (2006.01) | ||
| U.S. Cl. 375—240.12 [375/240.16; 382/247] | 2 Claims |
| 1. An image decoding method for generating a predictive pixel value of a current picture to be decoded, using pixel values
of two reference pictures, and decoding the current picture using the predictive pixel value, the method comprising:
a first parameter calculation step of calculating, using a first parameter calculation unit, a first parameter corresponding
to a temporal distance between the current picture and a first reference picture;
a second parameter calculation step of calculating, using a second parameter calculation unit, a second parameter corresponding
to a temporal distance between the first reference picture and a second reference picture;
a judgment step of judging, using a judgment unit, whether or not a value of a third parameter calculated based on the first
and the second parameters is included in a predetermined range;
a predictive pixel value generation step of
(i) generating, using a predictive pixel value generation unit, a predictive pixel value of the current picture by scaling
a pixel value of the first reference picture and a pixel value of the second reference picture using a weighting coefficient
calculated by the first parameter and the second parameter, in a case where it is judged, in said judgment step, that the
value of the third parameter is included in the predetermined range, and
(ii) generating, using the predictive pixel value generation unit, a predictive pixel value of the current picture by scaling
a pixel value of the first reference picture and a pixel value of the second reference picture using a weighting coefficient
of a predetermined value, in a case where it is judged, in said judgment step, that the value of the third parameter is not
included in the predetermined range; and
a decoding step of decoding, using a decoding unit, the current picture using the predictive pixel value calculated in said
predictive pixel value generation step.
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