Patent ID: 8451890

Claim:
A method of decoding a coded stream including a coded picture 1 representing an interlaced picture 1 and a coded picture 2 representing an interlaced picture 2 , wherein both of the interlaced pictures 1 and 2 are both included in an access unit, wherein a view point at which the picture 1 is captured is different from a view point at which the picture 2 is captured, and wherein said decoding method comprises: extracting a first flag 1 (field_pic_flag) regarding the coded picture 1 and a first flag 2 (field_pic_flag) regarding the coded picture 2 , each of the first flags 1 and 2 being included in the coded stream and indicating a first coding basis, as one of a per-field basis and a per-frame basis, wherein the first flag 1 is a same value as the first flag 2 ; extracting a second flag 1 (bottom_field_flag) regarding the coded picture 1 and a second flag 2 (bottom_field_flag) regarding the coded picture 2 , each of the second flags 1 and 2 being included in the coded stream and indicating a second coding basis, as one of a per-top-field basis and a per-bottom-field basis, when the first coding basis is the per-field basis, wherein the second flag 1 is a same value as the second flag 2 ; decoding the coded picture 1 on the per-frame basis to obtain a picture 1 and, by referring to the obtained picture 1 , decoding the coded picture 2 on the per-frame basis to obtain a picture 2 , when both the first flag 1 and the first flag 2 indicate the per-frame basis; decoding the coded picture 1 on the per-top-field basis to obtain the picture 1 and, by referring to the obtained picture 1 , decoding the coded picture 2 on the per-top-field basis to obtain the picture 2 , when both the first flag 1 and the first flag 2 indicate the per-field basis and when both the second flag 1 and the second flag 2 indicate the per-top-field basis; and decoding the coded picture 1 on the per-bottom-field basis to obtain the picture 1 and, by referring to the obtained picture 1 , decoding the coded picture 2 on the per-bottom-field basis to obtain the picture 2 , when both the first flag 1 and the first flag 2 indicate the per-field basis and when both the second flag 1 and the second flag 2 indicate the per-bottom-field basis.