Patent ID: 11863732
Assignee: B1 INSTITUTE OF IMAGE TECHNOLOGY, INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 1:
2. A method of encoding a 360-degree image performed by an image encoding apparatus, the method comprising:
obtaining a 2-dimensional image projected from an image with a 3-dimensional projection structure and including at least one face;
obtaining an expanded 2-dimensional image including the 2-dimensional image and a predetermined expansion region;
generating a predicted image by performing prediction, information on the prediction being encoded into the bitstream; and
encoding data of the expanded 2-dimensional image into the bitstream based on the predicted image and a residual image,
wherein sample values of the expansion region are determined by changing sample values of the face for the sample values of the expansion region,
wherein size information on a size of the expansion region is encoded into the bitstream,
wherein the predicted image is generated by performing inter prediction, and
wherein the 3-dimensional projection structure is selectively determined among a plurality of 3-dimensional projection structures including a first 3-dimensional projection structure and a second 3-dimensional projection structure, the determined 3-dimensional projection structure being encoded into the bitstream based on identification information,
wherein existence information indicating existence of the expansion region is encoded into the bitstream,
wherein the size information for the expansion region is encoded into the bitstream in case the existence information indicates that the expansion region exists,
wherein, based on a projection format for the 3-dimensional projection structure is a first projection format, the size of the expansion region is encoded based on first width information for specifying a width of the expansion region on a left side of the face and second width information for specifying a width of the expansion region on a right side of the face, both the first width information and the second width information being encoded into the bitstream,
wherein, based on a projection format for the 3-dimensional projection structure is a second projection format, the size of the expansion region is encoded based on first width information for specifying a width of the expansion region on a left side of the face, second width information for specifying a width of the expansion region on a right side of the face, third height information for specifying a height of the expansion region on a top side of the face and fourth height information for specifying a height of the expansion region on a bottom side of the face, all of the first width information, the second width information, the third height information and the fourth height information being encoded into the bitstream.