| CPC H04N 19/167 (2014.11) [H04N 19/119 (2014.11); H04N 19/174 (2014.11); H04N 19/463 (2014.11); H04N 19/597 (2014.11); H04N 19/70 (2014.11)] | 5 Claims |
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1. An apparatus of processing a first bitstream in which each of pictures has been encoded with being split into a plurality of tiles, each tile comprised of one or more coding tree units, the first bitstream including encoded pixel data of the pictures and parameters used for encoding the pictures, the apparatus comprising one or more processors configured to:
receive the first bitstream which includes tile split information and area information,
wherein the area information is included in a header of the first bitstream, the header being a Sequence Parameter Set containing parameters which are referenced in common by all of the pictures, and
wherein the area information comprises first and second syntax elements for respectively indicating horizontal and vertical coordinates of a reference position in the pictures, and third and fourth syntax elements for respectively indicating a width and a height from the reference position, and allows an area which includes two or more tiles;
generate a second bitstream to be decoded, by:
extracting, from the encoded pixel data of the pictures included in the first bitstream, only encoded pixel data of an area extending by the width and the height indicated by the third and fourth syntax elements from the reference position indicated by the first and second syntax elements, and
modifying at least part of the parameters in the first bitstream using the reference position, and the width and the height from the reference position which are defined by the area information; and
output the second bitstream to thereby decode the extracted encoded pixel data.
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