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

Claim 0:
1. A method for decoding a 360-degree image, the method comprising:
receiving a bitstream in which the 360-degree image is encoded, the bitstream including data of an extended 2-dimensional image, the extended 2-dimensional image including a 2-dimensional image and a predetermined extension region, and the 2-dimensional image being projected from an image with a 3-dimensional projection structure and including at least one face; and
reconstructing the extended 2-dimensional image by obtaining a residual image of a current block included in the 2-dimensional image based on residual information included the bitstream and by obtaining a prediction image of the current block,
wherein a size of the extension region is determined based on size information indicating a size of the extension region, one or more syntax elements for the size information being obtained from 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.