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US 12,771,825 B2Granted
Image encoding/decoding method and device
AssigneeB1 Institute of Image Technology, Inc.
InventorKi Baek Kim
Life of this patent
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Abstract
An image prediction method according to the present invention may comprise: identifying a reference pixel region designated for obtaining correlation information; determining a reference pixel processing configuration on the basis of determination of the availability of the reference pixel region; and performing intra prediction according to the determined reference pixel processing. As described above, performing intra prediction on the basis of the availability of a reference pixel according to the present invention can improve encoding performance.
Claims6
An image decoding method performed by an image decoding apparatus, the method comprising:
- obtaining, from a bitstream, a first flag specifying whether to use an affine model;
- determining whether to apply the affine model for a current block based on information obtained from the bitstream, the information including the first flag;
- determining the affine model for the current block among a 4-parameter affine model and a 6-parameter affine model based on a second flag signaled through the bitstream;
- deriving, in case the affine model is applied for the current block, a plurality of control point vectors for the current block based on the determined affine model;
- deriving a motion vector for the current block based on the plurality of control point vectors;
- generating a prediction block for the current block by performing inter-prediction based on the motion vector for the current block;
- and
- reconstructing the current block based on the prediction block,
- wherein the second flag indicates whether to use the 4-parameter affine model or the 6-parameter affine model,
- wherein a number of the plurality of control point vectors is determined based on both the first flag and the second flag, and
- wherein the plurality of the control point vectors are derived further based on whether a position of the current block is located on a boundary of a CTU (coding tree unit).
8 more elements
An image encoding method performed by an image encoding apparatus, the method comprising:
- determining whether to apply an affine model for a current block;
- encoding information for indicating whether to apply the affine model for the current block into a bitstream, the information including a first flag specifying whether to use the affine model;
- determining the affine model for the current block from among a 4-parameter affine model and a 6-parameter affine model, a second flag for the determined affine model being signaled through the bitstream;
- deriving, in case the affine model is applied for the current block, a plurality of control point vectors for the current block based on the determined affine model;
- deriving a motion vector for the current block based on the plurality of control point vectors;
- generating a prediction block for the current block by performing inter-prediction based on the motion vector for the current block;
- and
- encoding the current block based on the prediction block,
- wherein the second flag indicates whether to use the 4-parameter affine model or the 6-parameter affine model,
- wherein both the first flag and the second flag are encoded for determining a number of the plurality of control point vectors, and
- wherein the plurality of the control point vectors are derived further based on whether a position of the current block is located on a boundary of a CTU (coding tree unit).
8 more elements
A method of transmitting a bitstream generated by an image encoding method performed by an image encoding apparatus, the image encoding method comprising:
- encoding, into the bitstream, a first flag specifying whether to use an affine model;
- determining the affine model for a current block from among a 4-parameter affine model and a 6-parameter affine model, a second flag for the determined affine model being signaled through the bitstream;
- deriving a plurality of control point vectors for the current block based on the determined affine model;
- deriving a motion vector for the current block based on the plurality of control point vectors;
- generating a prediction block for the current block by performing inter-prediction based on the motion vector for the current block;
- generating a residual block of the current block based on the prediction block;
- encoding, into the bitstream, the residual block of the current block based on the prediction block;
- and
- generating the bitstream based on the prediction block,
- wherein the bitstream is transmitted to an image decoding apparatus,
- wherein the second flag indicates whether to use the 4-parameter affine model or the 6-parameter affine model,
- wherein both the first flag and the second flag are encoded for determining a number of the plurality of control point vectors, and
- wherein the plurality of the control point vectors are derived further based on whether a position of the current block is located on a boundary of a CTU (coding tree unit).
10 more elements
Dependencies are inferred from the claim text.