US RE50,573 E1
Motion vector calculation method, picture coding method, picture decoding method, motion vector calculation apparatus, and picture coding and decoding apparatus
Toshiyasu Sugio, Osaka (JP); Takahiro Nishi, Nara (JP); Youji Shibahara, Osaka (JP); and Hisao Sasai, Osaka (JP)
Assigned to SUN PATENT TRUST, New York, NY (US)
Appl. No. 18/394,292
Filed by Sun Patent Trust, New York, NY (US)
PCT Filed Nov. 22, 2011, PCT No. PCT/JP2011/006517
§ 371(c)(1), (2), (4) Date Feb. 6, 2013,
PCT Pub. No. WO2012/070235, PCT Pub. Date May 31, 2012.
Application 18/394,292 is a reissue of application No. 13/814,564, filed on Nov. 22, 2011, granted, now 9,300,961, issued on Mar. 29, 2016.
Claims priority of provisional application 61/416,822, filed on Nov. 24, 2010.
Int. Cl. H04N 19/513 (2014.01); H04N 19/105 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/44 (2014.01); H04N 19/52 (2014.01)
CPC H04N 19/513 (2014.11) [H04N 19/105 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/44 (2014.11); H04N 19/52 (2014.11)] 3 Claims
OG exemplary drawing
 
1. A motion vector calculation method of calculating a motion vector of a current block to be processed that is included in a moving picture, said motion vector calculation method comprising:
a [ first ] determination step of determining a reference picture, the reference picture being included in one of (i) a first reference picture group of the current block and (ii) a second reference picture group of the current block;
a selection step of selecting [ , based on a position flag that indicates that the reference picture is included in one of the first reference picture group and the second reference picture group, ] one of at least one reference motion vector of a reference block in the reference picture; and
a calculation step of calculating the motion vector of the current block using the one reference motion vector selected in said selection step,
wherein, in said selection step,
when the reference block in the reference picture has a first reference motion vector and a second reference motion vector that respectively correspond to the first reference picture group and the second reference picture group, (i) the first reference motion vector is selected when the reference picture is included in the second reference picture group and (ii) the second reference motion vector is selected when the reference picture is included in the first reference picture group, and
when the reference block has only one reference motion vector, the one reference motion vector is selected.
[ wherein said selection step includes:
a second determination step of determining that (i) the reference block in the reference picture has a first reference motion vector and a second reference motion vector that respectively correspond to the first reference picture group and the second reference picture group and (ii) the position flag indicates that the reference picture is included in the second reference picture group; and
a selection step of selecting the first reference motion vector in response to said second determination step determining that (i) the reference block in the reference picture has a first reference motion vector and a second reference motion vector that respectively correspond to the first reference picture group and the second reference picture group and (ii) the position flag indicates that the reference picture is included in the second reference picture group.]