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US 11,962,791 B2Granted
Method for inter prediction and device therefor, and method for motion compensation and device therefor
AssigneeSamsung Electronics Co., Ltd.
InventorsYoung-o Park, Il-koo Kim, Chan-yul Kim, Kwang-pyo Choi
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Abstract
Provided are an inter prediction method and a motion compensation method. The inter prediction method includes: performing inter prediction on a current image by using a long-term reference image stored in a decoded picture buffer; determining residual data and a motion vector of the current image generated via the inter prediction; and determining least significant bit (LSB) information as a long-term reference index indicating the long-term reference image by dividing picture order count (POC) information of the long-term reference image into most significant bit (MSB) information and the LSB information.
Claims3
A video decoding method comprising:
- obtaining, from a bitstream, least significant bit (LSB) information regarding picture order count (POC) information of a current long-term reference image of a current image;
- determining most significant bit (MSB) information regarding the POC information of the current long-term reference image of the current image based on MSB information regarding POC information of a previous long-term reference image of the current image and a difference between the MSB information regarding the POC information of the current long-term reference image of the current image and the MSB information regarding the POC information of the previous long-term reference image of the current image;
- determining the POC information of the current long-term reference image of the current image by using the LSB information and the MSB information regarding the POC information of the current long-term reference image of the current image;
- and
- obtaining a predicted block of the current image by using the current long-term reference image of the current image corresponding to the POC information of the current long-term reference image of the current image;
- obtaining residues by decoding the bitstream;
- and
- reconstructing the current image by using the predicted block of the current image and the obtained residues,
- wherein the MSB information regarding the POC information of the current long-term reference image of the current image is information regarding a quotient generated by dividing a value related to the POC information of the current long-term reference image of the current image by a maximum size of the LSB information, and the LSB information is information regarding a remainder value generated by dividing the POC information of the current long-term reference image of the current image by the maximum size of the LSB information, and
- wherein the POC information of the current long-term reference image of the current image is used for an inter prediction on the current image by using the current long-term reference image of the current image.
7 more elements
A video encoding method comprising:
- performing an inter prediction on a current image by using a current long-term reference image of the current image to generate a predicted block of the current image;
- obtaining picture order count (POC) information of the current long-term reference image of the current image corresponding to the current long-term reference image of the current image;
- obtaining information regarding transform coefficients of the current image based on the predicted block of the current image;
- and
- generating least significant bit (LSB) information regarding the POC information of the current long-term reference image of the current image;
- and
- generating a bitstream including the LSB information regarding the POC information of the current long-term reference image of the current image and information regarding the transform coefficients of the current image,
- wherein POC information of the current long-term reference image of the current image is obtained by performing the inter prediction on the current image by using the current long-term reference image of the current image,
- wherein the LSB information is information regarding a remainder value generated by dividing the POC information of the current long-term reference image of the current image by a maximum size of the LSB information.
6 more elements
A non-transitory computer-readable storage medium storing a bitstream comprising:
- least significant bit (LSB) information regarding picture order count (POC) information of a current long-term reference image of a current image;
- and
- information regarding transform coefficients of the current image,
- wherein the LSB information regarding POC information is generated based on POC information of the current long-term reference image of the current image corresponding to the current long-term reference image of the current image,
- wherein the POC information of the current long-term reference image of the current image is obtained by performing an inter prediction on the current image by using the current long-term reference image of the current image,
- wherein the information regarding the transform coefficients of the current image is obtained based on a predicted block of the current image,
- wherein the predicted block of the current image is generated by performing the inter prediction on the current image by using the current long-term reference image of the current image,
- wherein the current image includes a plurality of maximum coding units, and
- wherein the LSB information is information regarding a remainder value generated by dividing the POC information of the current long-term reference image of the current image by a maximum size of the LSB information.
6 more elements
Dependencies are inferred from the claim text.