CPC H04N 13/161 (2018.05) [H04N 19/103 (2014.11); H04N 19/105 (2014.11); H04N 19/11 (2014.11); H04N 19/119 (2014.11); H04N 19/124 (2014.11); H04N 19/129 (2014.11); H04N 19/13 (2014.11); H04N 19/134 (2014.11); H04N 19/167 (2014.11); H04N 19/172 (2014.11); H04N 19/176 (2014.11); H04N 19/597 (2014.11); H04N 19/625 (2014.11); H04N 19/70 (2014.11)] | 9 Claims |
1. A method of decoding a 360-degree image, the method comprising:
receiving a bitstream obtained by encoding the 360-degree image;
generating a predicted image with reference to syntax information acquired from the received bitstream;
acquiring a decoded image by combining the generated predicted image with a residual image acquired by inversely quantizing and inversely transforming the bitstream; and
reconstructing the decoded image to produce a 360-degree image corresponding to a projection format,
wherein the generating of the predicted image comprises:
obtaining a reference image acquired by restoring the bitstream and by performing image expansion on the reference image; and
generating a predicted image with reference to the reference image on which the image expansion is performed,
wherein the reference image on which the image expansion is performed includes an expansion region,
wherein a size of the expansion region is determined as a value indicated by size information obtained from the bitstream, and
the size information is restricted to indicate an even number of luma samples according to a color format of the decoded image.
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