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US 11,240,526 B2Granted
Method and apparatus for decoding image using interpicture prediction
AssigneeIndustry-University Cooperation Foundation Hanyang University
InventorsJe Chang Jeong, Ki Baek Kim, Do Kyung Lee
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Abstract
Disclosed are a method and apparatus for decoding an image using inter-prediction. The method of decoding an image using inter-prediction includes receiving a bitstream; acquiring a portion of information indicating a motion vector of a current block to be decoded in the received bitstream, obtaining the motion vector of the current block by using the acquired information to determine the remaining information other than the portion, and generating a prediction block for the current block through inter-prediction that uses the motion vector of the current block. Therefore, it is possible to improve image decoding/encoding efficiency.
Claims6
An image decoding method using inter-prediction, the image decoding method comprising:
- receiving a bitstream;
- determining a current block by dividing a coding block based on division information included in the bitstream;
- acquiring a motion vector candidate of the current block based on a motion vector indicator indicating the motion vector candidate from among a plurality of motion vector candidates;
- acquiring a motion vector difference between a motion vector of the current block and the motion vector candidate based on at least one of size information indicating a size of the motion vector difference or sign information indicating a sign of the motion vector difference, wherein the sign information is signaled when the size of the motion vector difference is greater than a pre-defined threshold size while the sign information is not signaled when the size of the motion vector difference is less than or equal to the pre-defined threshold size;
- acquiring the motion vector of the current block based on the motion vector candidate and the motion vector difference;
- and
- generating a prediction block for the current block through the inter-prediction that uses the motion vector of the current block,
- wherein the division information includes at least one of a quad division flag indicating whether the coding block is divided based a quad tree division, a binary division flag indicating whether the coding block is divided based on a binary tree division, or a division direction flag indicating whether the coding block is divided in a vertical direction or in a horizontal direction,
- wherein the division direction flag is selectively signaled based on a division type of a higher block to which the coding block belongs, and
- wherein the higher block is representative of a block having a smaller division depth than the coding block.
7 more elements
An image encoding method using inter-prediction, the image encoding method comprising:
- encoding division information indicating a number of a plurality of sub-coding blocks into which a coding block is divided;
- encoding a motion vector of a current block for generating a prediction block of the current block through the inter-prediction, the current block being one of the sub-coding blocks,
- wherein encoding the motion vector of the current block comprises:
- encoding a motion vector indicator indicating a motion vector candidate of the current block from among a plurality of motion vector candidates;
- and
- encoding at least one of size information indicating a size of a motion vector difference between the motion vector of the current block and the motion vector candidate, or sign information indicating a sign of the motion vector difference;
- and
- generating a bitstream based on the division information, the motion vector indicator, the size information, and the sign information,
- wherein the sign information is encoded when the size of the motion vector difference is greater than a pre-defined threshold size while the sign information is not encoded when the size of the motion vector difference is less than or equal to the pre-defined threshold size,
- wherein the division information includes at least one of a quad division flag indicating whether the coding block is divided based a quad tree division, a binary division flag indicating whether the coding block is divided based on a binary tree division, or a division direction flag indicating whether the coding block is divided in a vertical direction or in a horizontal direction,
- wherein the division direction flag is selectively encoded based on a division type of a higher block to which the coding block belongs, and
- wherein the higher block is representative of a block having a smaller division depth than the coding block.
9 more elements
A non-transitory computer-readable medium for storing data associated with a video signal, comprising:
- a bitstream encoded by an encoding method comprising:
- encoding division information indicating a number of a plurality of sub-coding blocks into which a coding block is divided;
- encoding a motion vector of a current block for generating a prediction block of the current block through the inter-prediction, the current block being one of the sub-coding blocks,
- wherein encoding the motion vector of the current block comprises:
- encoding a motion vector indicator indicating a motion vector candidate of the current block from among a plurality of motion vector candidates;
- and
- encoding at least one of size information indicating a size of a motion vector difference between the motion vector of the current block and the motion vector candidate, or sign information indicating a sign of the motion vector difference;
- and
- generating a bitstream based on the division information, the motion vector indicator, the size information, and the sign information,
- wherein the sign information is not encoded when the size of the motion vector difference is less than or equal to a pre-defined threshold size,
- wherein the division information includes at least one of a quad division flag indicating whether the coding block is divided based a quad tree division, a binary division flag indicating whether the coding block is divided based on a binary tree division, or a division direction flag indicating whether the coding block is divided in a vertical direction or in a horizontal direction,
- wherein the division direction flag is selectively encoded based on a division type of a higher block to which the coding block belongs, and
- wherein the higher block is representative of a block having a smaller division depth than the coding block.
10 more elements
Dependencies are inferred from the claim text.