Picture coding method

Abstract

A picture coding method according to the present invention includes: a coding step (S 102 , S 103 ) of coding, picture parameter sets (PPS) to be used for decoding all the pictures (pic) included in a random access unit (RAU) made up of plural pictures and a sequence parameter set (SPS); and a parameter set placement step (S 104 ) of placing, in the random access unit (RAU), the parameter set (PPS, SPS) coded in the coding step (S 102 , S 103 ).

1 . A picture coding method for coding a picture signal on a picture-by-picture basis so as to generate a bit stream, the method comprising:
 a coding step of coding a parameter set to be used for decoding all pictures included in an access unit made up of a plurality of pictures; and   a parameter set placement step of placing, in each access unit in the bit stream, the parameter set coded in the coding step.   
     
     
         2 . The picture coding method according to  claim 1 , wherein
 the parameter set includes picture parameter sets to be used for decoding one or more pictures, and   the picture coding method further comprises a parameter identification information placement step of placing parameter identification information before a codeword for pixels of a picture in the bit stream, the parameter identification information indicating a picture parameter set for the picture.   
     
     
         3 . The picture coding method according to  claim 2 , wherein
 in the parameter set placement step, the parameter set is placed before any of the pictures in the access unit in the bit stream.   
     
     
         4 . The picture coding method according to  claim 3 , further comprising:
 a structure identification information generation step of generating structure identification information indicating a placement of the parameter set.   
     
     
         5 . The picture coding method according to  claim 2 , wherein
 the parameter set includes a plurality of the picture parameter sets and a sequence parameter set can be used in common for decoding all the pictures included in the access unit, and   in the parameter set placement step, the sequence parameter set is placed in a head side of the access unit in the bit stream, and a picture parameter set for a picture included in a sub access unit is placed in the sub access unit in the bit stream, the sub access unit being obtained by dividing the access unit.   
     
     
         6 . The picture coding method according to  claim 5 , further comprising:
 a structure identification information generation step of generating structure identification information indicating a placement of the parameter set.   
     
     
         7 . The picture coding method according to  claim 6 , wherein
 in the structure identification information generation step, the structure identification information is generated and then included in the bit stream.   
     
     
         8 . The picture coding method according to  claim 7 , wherein
 in the structure identification information generation step, the structure identification in-formation is generated and then attached to the bit stream.   
     
     
         9 . The picture coding method according to  claim 2 , wherein
 the parameter set includes a plurality of picture parameter sets, and   in the parameter set placement step, a picture parameter set for a picture is placed before the picture in the access unit in the bit stream.   
     
     
         10 . The picture coding method according to  claim 9 , wherein
 in the parameter set placement step, a picture parameter set for a picture is placed immediately before the picture in the access unit in the bit stream, except for a picture parameter set that is already placed.   
     
     
         11 . The picture coding method according to  claim 9 , wherein
 in the coding step, either any or all of the picture parameter sets are coded for plural times, and a plurality of same coded picture parameter sets are generated, and   in the parameter set placement step, the plurality of same picture parameter sets coded in the coding step are placed in the same access unit.   
     
     
         12 . The picture coding method according to  claim 11 , wherein
 the parameter set includes a sequence parameter set can be used in common for decoding all the pictures included in the access unit,   in the coding step, the sequence parameter set is coded for plural times, and a plurality of same coded sequence parameter sets are generated, and   in the parameter set placement step, the plurality of same sequence parameter sets coded in the coding step are placed in the same access unit.