6results about How to "Improve encoding/decoding efficiency" patented technology

The present invention relates to an image encoding / decoding method and a recording medium therefor. To this end, a method of decoding an image can include the steps of generating a list of a plurality of motion vector candidates according to an inter prediction direction of a current block, obtaining a plurality of motion vectors for the current block by using the list of the plurality of motion vector candidates, determining a plurality of prediction blocks for the current block by using the plurality of motion vectors, and obtaining a final prediction block for the current block based on the plurality of prediction blocks.

This invention provides a video signal decoding / encoding method and a bitstream transmission method. The video signal decoding method includes the following steps: determining an intra-frame prediction mode for a current block; obtaining reference samples based on neighboring samples of the current block; obtaining a first prediction sample for the current block based on the reference samples and the intra-frame prediction mode; obtaining a second prediction sample for the current block by applying weighted filtering to the reference samples and the first prediction sample; and obtaining a reconstructed sample for the current block based on the second prediction sample.

This invention relates to an image encoding / decoding method and a recording medium for the method. To this end, a method for decoding an image may include the following steps: generating a list of multiple motion vector candidates based on the inter-frame prediction direction of a current block; obtaining multiple motion vectors for the current block using the list of multiple motion vector candidates; determining multiple prediction blocks for the current block using the multiple motion vectors; and obtaining a final prediction block for the current block based on the multiple prediction blocks.

Image encoding / decoding methods and apparatus are provided. The image decoding method performed by the image decoding apparatus according to this disclosure includes the following steps: obtaining a first flag indicating the presence of Network Abstraction Layer (NAL) HRD parameters in the bitstream and a second flag indicating the presence of Video Coding Layer (VCL) HRD parameters in the bitstream; obtaining a third flag indicating whether the time interval between the output times of consecutive frames in the bitstream has a fixed value; deriving the output time of the frames in the bitstream based on at least one of the first, second, and third flags; and processing the frames in the bitstream based on the derived output times, wherein the first flag has a second value indicating that the NAL HRD parameters are not present in the bitstream and the second flag has a second value indicating that the VCL HRD parameters are not present in the bitstream, and the third flag can be restricted to having a first value indicating that the time interval between the output times of consecutive frames in the bitstream has a fixed value.

A video encoding method and apparatus are disclosed. An intra prediction method for video decoding includes determining an intra prediction mode belonging to an initial directional prediction range for an intra prediction of an MxN current block, determining whether to correct the intra prediction mode from the initial directional prediction range to a corrected directional prediction range based on a horizontal length N and a vertical length M of the MxN current block, determining a corrected intra prediction mode belonging to the corrected directional prediction range, and performing the intra prediction of the MxN current block based on the corrected intra prediction mode, the initial directional prediction range including a first prediction range, a second prediction range, and a third prediction range, the corrected directional prediction range including the first prediction range, the second prediction range, and a fourth prediction range according to the vertical length M, the intra prediction being performed by using reference regions adjacent to the current block, the reference regions including an upper reference pixel column and a left reference pixel column of the current block.

A video encoding method and apparatus are disclosed. An intra prediction method for video decoding, comprising: determining an intra prediction mode belonging to an initial directional prediction range for an intra prediction of an MxN current block; determining whether to correct the intra prediction mode from the initial directional prediction range to a corrected directional prediction range based on a horizontal length N and a vertical length M of the MxN current block; determining a corrected intra prediction mode belonging to the corrected directional prediction range; performing the intra prediction of the MxN current block based on the corrected intra prediction mode, the initial directional prediction range comprising a first prediction range, a second prediction range and a third prediction range, the corrected directional prediction range comprising the first prediction range, the second prediction range and a fourth prediction range according to the vertical length M of the MxN current block, the intra prediction of the MxN current block being performed by using a reference region adjacent to the MxN current block.