Video encoding/decoding method and device
地域：
Seoul
摘要
A video encoding/decoding device according to the present invention may determine an intra prediction mode of a current block on the basis of a most probable mode (MPM) of the current block or an intra prediction mode of a neighboring block, determine a reference region for intra prediction of the current block, and perform intra prediction on the current block by using the intra prediction mode and the reference region.
說明書
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This application is a U.S. National Stage Application of International Application No. PCT/KR2019/017479, filed on Dec. 11, 2019, which claims the benefit under 35 USC 119(a) and 365(b) of Korean Patent Application No. 10-2018-0163526, filed on Dec. 17, 2018, in the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes.
The present disclosure relates to a method and a device of encoding/decoding a video signal.
The demands for high-resolution and high-quality images have increased in a variety of application fields. As image data becomes high-resolution and high-quality, the volume of data relatively increases compared to the existing image data, so when image data is transmitted by using media such as the existing wire and wireless broadband circuit or is stored by using the existing storage medium, expenses for transmission and expenses for storage increase. High efficiency image compression technologies may be utilized to resolve these problems which are generated as image data becomes high-resolution and high-quality.
The present disclosure is to improve encoding/decoding efficiency of intra prediction.
The present disclosure is to improve encoding/decoding efficiency of an intra prediction mode.
權(quán)利要求
What is claimed is:1. A video decoding method, comprising:obtaining a flag from a bitstream, the flag indicating whether an intra prediction mode of a current block is derived from a first candidate group; determining a candidate group for the intra prediction mode of the current block among a plurality of candidate groups based on the flag; deriving the intra prediction mode of the current block based on the determined candidate group; and performing intra prediction for the current block based on the derived intra prediction mode and a reference region, wherein the plurality of the candidate groups includes the first candidate group, a second candidate group and a third candidate group, wherein the first candidate group is configured with only one default mode, wherein the second candidate group is configured by using an intra prediction mode of a neighboring block adjacent to the current block, wherein the third candidate group is configured with remaining modes except for candidate modes of the first candidate group and the second candidate group among intra prediction modes available for the current block, wherein the default mode is representative of one of a DC mode or a Planar mode, wherein the default mode belonging to the first candidate group is not included in the second candidate group, wherein in response to a mode value of the derived intra prediction mode being less than a mode value of the DC mode, one reference line of the reference region is available for the intra prediction of the current block, and wherein in response to a mode value of the derived intra prediction mode being greater than a mode value of the DC mode, three reference lines of the reference region are available for the intra prediction of the current block. 2. The method of claim 1 , wherein at least one candidate mode belonging to the second candidate group is derived by adding or subtracting a value of N to or from the intra prediction mode of the neighboring block, andwherein the value of N is a natural number greater than or equal to 2. 3. The method of claim 2 , wherein a number of candidate modes belonging to the second candidate group is 5. 4. A video encoding method, comprising:determining an intra prediction mode of a current block; and performing intra prediction for the current block based on the intra prediction mode of the current block and a reference region, wherein the intra prediction mode of the current block belongs to a candidate group among a plurality of candidate groups, wherein the plurality of the candidate groups includes a first candidate group, a second candidate group and a third candidate group, wherein a flag indicating whether the intra prediction mode of the current block is derived from the first candidate group is encoded into a bitstream, wherein the first candidate group is configured with only one default mode, wherein the second candidate group is configured by using an intra prediction mode of a neighboring block adjacent to the current block, wherein the third candidate group is configured with remaining modes except for candidate modes of the first candidate group and the second candidate group among intra prediction modes available for the current block, wherein the default mode is representative of one of a DC mode or a Planar mode, wherein the default mode belonging to the first candidate group is not included in the second candidate group, wherein in response to a mode value of the intra prediction m(de being less than a mode value of the DC mode, one reference line of the reference region is available for the intra prediction of the current block, and wherein in response to mode value of the inta prediction mode being greater than a mode value of the DC mode, three reference lines of the reference region are available for the intra prediction of the current block. 5. The method of claim 4 , wherein at least one candidate mode belonging to the second candidate group is derived by adding or subtracting a value of N to or from the intra prediction mode of the neighboring block, andwherein the value of N is a natural number greater than or equal to 2. 6. The method of claim 5 , wherein a number of candidate modes belonging to the second candidate group is 5. 7. A non-transitory computer-readable recording medium storing bitstream generated by an encoding method, the method comprising:determining an intra prediction mode of a current block; and performing intra prediction for the current block based on the intra prediction mode of the current block and a reference region, wherein the intra prediction mode of the current block belongs to a candidate group among a plurality of candidate groups, wherein the plurality of the candidate groups includes a first candidate group, a second candidate group and a third candidate group, wherein a flag indicating whether the intra prediction mode of the current block is derived from the first candidate group is encoded into the bitstream, wherein the first candidate group is configured with only one default mode, wherein the second candidate group is configured by using an intra prediction mode of a neighboring block adjacent to the current block, wherein the third candidate group is configure with remaining modes except for candidate modes of the first candidate group and the second candidate group among intra prediction modes available for the current block, wherein the default mode is representative of one of a DC mode or a Planar mode, wherein the default mode belonging to the first candidate group is not included in the second candidate group, wherein in response to a mode value of the intra prediction mode being less than a mode value of the DC mode, one reference line of the reference region is available for the intra prediction of the current block, and wherein in response to a mode value of the intra prediction mode being greater than a mode value of the DC mode, three reference lines of the reference region are available for the intra prediction of the current block. 8. The non-transitory computer-readable recording medium of claim 7 , wherein at least one candidate mode belonging to the second candidate group is derived by adding or subtracting a value of N to or from the intra prediction mode of the neighboring block, andwherein the value of N is a natural number greater than or equal to 2. 9. The non-transitory computer-readable recording medium of claim 8 , wherein a number of candidate modes belonging to the second candidate group is 5. 10. The method of claim 1 , wherein the third candidate group includes first remaining modes to which an index in a range of 0 to 2 is assigned and second remaining modes to which an index in a range other than 0 to 2 is assigned,wherein a number of bits allocated to remaining mode information for the first remaining modes is 5, and wherein a cumber of bits allocated to remaining mode information for the second remaining modes is 6.
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