Picture information decoding method and picture information encoding method
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsChong Lim, Sheng Shen, Shinya Kadono
Life of this patent
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Abstract
A picture information decoding method enables to switch a pixel precisions of a motion vector while compatibility with conventional standard is maintained and a delay occurred in parsing a picture parameter set is prevented, and it is judged whether or not a half_pixel_mv_flag indicating the pixel precision of the motion vector used for picture decoding is included as a last parameter in a plurality of parameters of a picture parameter set, and in the case where the half_pixel_mv_flag is included, the half_pixel_mv_flag is decoded.
Claims15
A picture information decoding method for decoding a picture parameter set which includes a plurality of parameters used for decoding a picture, said method comprising:
- judging whether or not precision information, which indicates a pixel precision of a motion vector used for decoding the picture, is included as a last parameter among the plurality of parameters in the picture parameter set;
- and
- decoding the precision information in the case where it is judged that the precision information is included as the last parameter in the picture parameter set.
A picture information encoding method for encoding a picture parameter set which includes a plurality of parameters used for a picture, said method comprising:
- encoding precision information, which indicates a pixel precision, as one of the plurality of parameters, based on the pixel precision of a motion vector used for encoding the picture;
- and
- placing the encoded precision information at the end of the encoded plurality of parameters.
A picture information decoding apparatus which decodes a picture parameter set including a plurality of parameters used for decoding a picture, said apparatus comprising:
- a judging unit operable to judge whether or not precision information, which indicates a pixel precision of a motion vector used for decoding the picture, is included as a last parameter among the plurality of parameters in the picture parameter set, and
- a decoding unit operable to decode the precision information in the case where the precision information is included in the picture parameter set.
A picture information encoding apparatus which encodes a picture parameter set including a plurality of parameters used for decoding a picture, said apparatus comprising:
- an encoding unit operable to encode precision information, which indicates a pixel precision, included as one of the plurality of parameters, based on the pixel precision of a motion vector used for encoding the picture;
- and
- a placing unit operable to place the encoded precision information at the end of the encoded plurality of parameters.
A data structure of a picture parameter set which has a plurality of parameters used for decoding a picture, comprising
- precision information included as a last parameter among the plurality of parameters in the picture parameter set, the precision information indicating a pixel precision of a motion vector used for decoding the picture.
Dependencies are inferred from the claim text.