Patent ID: 11949913
Assignee: B1 INSTITUTE OF IMAGE TECHNOLOGY, INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 6:
7. A method for encoding a 360-degree image, 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 extended 2-dimensional image including the 2-dimensional image and a predetermined extension region; and
encoding data of the extended 2-dimensional image into a bitstream in which the 360-degree image is encoded by obtaining a prediction image of a current block included in the 2-dimensional image and by obtaining a residual image of a current block based on the prediction image of the current block,
wherein a size of the extension region is encoded based on size information indicating a size of the extension region, one or more syntax elements for the size information being encoded into the bitstream,
wherein the number of syntax elements for the size information is determined differently based on a projection format for the 3-dimensional projection structure, the projection format being one among a plurality of projection formats including an ERP format in which the 360-degree image is projected in a two-dimensional plane and a CMP format in which the 360-degree image is projected in a cube, and
wherein sample values of the extension region are determined differently according to a padding method selected from a plurality of padding methods.