Image data encoding/decoding method and apparatus
AssigneeB1 Institute of Image Technology, Inc.
InventorKi Baek KIM
Life of this patent
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Abstract
Disclosed are methods and apparatuses for image data encoding/decoding. A method of decoding an image includes receiving a bitstream in which the image is encoded; obtaining index information for specifying a block division type of a current block in the image; and determining the block division type of the current block from a candidate group pre-defined in the decoding apparatus. The candidate group includes a plurality of candidate division types, including at least one of a non-division, a first quad-division, a second quad-division, a binary-division or a triple-division. The method also includes dividing the current block into a plurality of sub-blocks; and decoding each of the sub-blocks with reference to syntax information obtained from the bitstream.
Claims4
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 decoding the data of an extended 2-dimensional image,
- wherein a size of the extension region is determined based on both first width information of the extension region on a left side of the face and second width information of the extension region on a right side of the face, both the first width information and the second width information being obtained from the bitstream,
- wherein the first width information and the second width information are restricted to indicate an even number of luma samples according to a color format of the 2-dimensional image,
- wherein sample values of the extension region are determined differently according to a padding method selected from a plurality of padding methods, and
- wherein the extended 2-dimensional image is reconstructed based on a residual image, the residual image being generated by performing inverse quantization for information on the residual image.
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,
- wherein a size of the extension region is encoded based on both first width information of the extension region on a left side of the face and second width information of the extension region on a right side of the face, both the first width information and the second width information being encoded into the bitstream,
- wherein the first width information and the second width information are restricted to indicate an even number of luma samples according to a color format of the 2-dimensional image,
- wherein sample values of the extension region are determined differently according to a padding method selected from a plurality of padding methods, and
- wherein the extended 2-dimensional image is encoded by performing quantization for a residual image.
A method of transmitting a bitstream that is generated by an image encoding method for encoding a 360-degree image, the image encoding 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,
- wherein a size of the extension region is encoded based on both first width information of the extension region on a left side of the face and second width information of the extension region on a right side of the face, both the first width information and the second width information being encoded into the bitstream,
- wherein the first width information and the second width information are restricted to indicate an even number of luma samples according to a color format of the 2-dimensional image,
- wherein sample values of the extension region are determined differently according to a padding method selected from a plurality of padding methods, and
- wherein the extended 2-dimensional image is encoded by performing quantization for a residual image.
A non-transitory computer-readable recording medium storing a bitstream that is generated by 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,
- wherein a size of the extension region is encoded based on both first width information of the extension region on a left side of the face and second width information of the extension region on a right side of the face, both the first width information and the second width information being encoded into the bitstream,
- wherein the first width information and the second width information are restricted to indicate an even number of luma samples according to a color format of the 2-dimensional image,
- wherein sample values of the extension region are determined differently according to a padding method selected from a plurality of padding methods, and
- wherein the extended 2-dimensional image is encoded by performing quantization for a residual image.
Dependencies are inferred from the claim text.