Device and method for decoding video data

1 . A method of decoding video data performed by an electronic device, the method comprising:

receiving the video data;

determining a block unit from a current frame included in the video data;

determining, for the block unit, a plurality of integer-sample reference blocks and a plurality of fractional-sample reference blocks from the current frame, wherein:

each of the plurality of integer-sample reference blocks is located at one of a plurality of integer-sample positions in the current frame, and

each of the plurality of fractional-sample reference blocks is located at one of a plurality of fractional-sample positions in the current frame;

determining a plurality of integer-sample template cost values based on the plurality of integer-sample reference blocks of the current frame;

determining a plurality of fractional-sample template cost values based on the plurality of fractional-sample reference blocks of the current frame;

selecting a plurality of prediction reference blocks of the current frame from the plurality of integer-sample reference blocks and the plurality of fractional-sample reference blocks based on the plurality of integer-sample template cost values and the plurality of fractional-sample template cost values; and

reconstructing the block unit based on the plurality of prediction reference blocks of the current frame.

2 . The method according to claim 1 , wherein at least one of the plurality of prediction reference blocks is selected from the plurality of fractional-sample reference blocks.

3 . The method according to claim 1 , further comprising:

determining a plurality of weighting parameters based on the plurality of integer-sample template cost values and the fractional-sample template cost values for the plurality of prediction reference blocks; and

weightedly combining the plurality of prediction reference blocks based on the plurality of weighting parameters to determine a predicted block,

wherein reconstructing the block unit is further based on the predicted block.

4 . The method according to claim 1 , further comprising:

determining an arrangement of the plurality of integer-sample reference blocks and the plurality of fractional-sample reference blocks based on the plurality of integer-sample template cost values and the plurality of fractional-sample template cost values,

wherein selecting the plurality of prediction reference blocks is further based on the arrangement.

5 . The method according to claim 1 , further comprising:

determining a reference area of the block unit from the current image, wherein:

the reference area is reconstructed prior to reconstructing the block unit, and

the plurality of integer-sample reference blocks and the plurality of fractional-sample reference blocks are determined from the reference area of the block unit.

6 . The method according to claim 5 , further comprising:

determining, from the reference area of the current frame, a block template region of the current frame neighboring the block unit;

determining, from the reference area of the current frame, a plurality of integer-sample template regions of the current frame, each neighboring one of the plurality of integer-sample reference blocks, wherein each of the plurality of integer-sample template cost values is determined by calculating a difference between the block template region of the current frame and a corresponding one of the plurality of integer-sample template regions of the current frame; and

determining, from the reference area of the current frame, a plurality of fractional-sample template regions of the current frame, each neighboring one of the plurality of fractional-sample reference blocks, wherein each of the plurality of fractional-sample template cost values is determined by calculating a difference between the block template region of the current frame and a corresponding one of the plurality of fractional-sample template regions of the current frame.

7 . The method according to claim 5 , further comprising:

sub-sampling the reference area based on the block unit by a sub-sampling factor to determine the plurality of integer-sample reference blocks;

determining a plurality of intermediate reference blocks from the plurality of integer-sample reference blocks based on the plurality of integer-sample template cost values; and

determining the plurality of fractional-sample reference blocks, each neighboring one of the plurality of intermediate reference blocks.

8 . The method according to claim 7 , further comprising:

determining the sub-sampling factor for the block unit from the video data.

9 . The method according to claim 5 , wherein:

the reference area includes a plurality of reconstructed samples reconstructed prior to reconstructing the block unit; and

each of the plurality of fractional-sample reference blocks is determined by using an interpolation filter to filter, respectively, at least one of the plurality of reconstructed samples.

10 . An electronic device for decoding video data, the electronic device comprising:

at least one processor; and

at least one non-transitory computer-readable medium coupled to the at least one processor and storing one or more computer-executable instructions that, when executed by the at least one processor, cause the electronic device to:

receive the video data;

determine a block unit from a current frame included in the video data;

determine, for the block unit, a plurality of integer-sample reference blocks and a plurality of fractional-sample reference blocks from the current frame, wherein:

each of the plurality of integer-sample reference blocks is located at one of a plurality of integer-sample positions in the current frame, and

each of the plurality of fractional-sample reference blocks is located at one of a plurality of fractional-sample positions in the current frame;

determine a plurality of integer-sample template cost values based on the plurality of integer-sample reference blocks of the current frame;

determine a plurality of fractional-sample template cost values based on the plurality of fractional-sample reference blocks of the current frame;

select a plurality of prediction reference blocks of the current frame from the plurality of integer-sample reference blocks and the plurality of fractional-sample reference blocks based on the plurality of integer-sample template cost values and the plurality of fractional-sample template cost values; and

reconstruct the block unit based on the plurality of prediction reference blocks of the current frame.

11 . The electronic device according to claim 10 , wherein at least one of the plurality of prediction reference blocks is selected from the plurality of fractional-sample reference blocks.

12 . The electronic device according to claim 10 , wherein the one or more computer-executable instructions, when executed by the at least one processor, further cause the electronic device to:

determine a plurality of weighting parameters based on the plurality of integer-sample template cost values and the fractional-sample template cost values for the plurality of prediction reference blocks; and

weightedly combine the plurality of prediction reference blocks based on the plurality of weighting parameters to determine a predicted block,

wherein reconstructing the block unit is further based on the predicted block.

13 . The electronic device according to claim 10 , wherein the one or more computer-executable instructions, when executed by the at least one processor, further cause the electronic device to:

determine an arrangement of the plurality of integer-sample reference blocks and the plurality of fractional-sample reference blocks based on the plurality of integer-sample template cost values and the plurality of fractional-sample template cost values,

wherein selecting the plurality of prediction reference blocks is further based on the arrangement.

14 . The electronic device according to claim 10 , wherein the one or more computer-executable instructions, when executed by the at least one processor, further cause the electronic device to:

determine a reference area of the block unit from the current image, wherein:

the reference area is reconstructed prior to reconstructing the block unit, and

the plurality of integer-sample reference blocks and the plurality of fractional-sample reference blocks are determined from the reference area of the block unit.

15 . The electronic device according to claim 14 , wherein the one or more computer-executable instructions, when executed by the at least one processor, further cause the electronic device to:

determine, from the reference area of the current frame, a block template region of the current frame neighboring the block unit;

determine, from the reference area of the current frame, a plurality of integer-sample template regions of the current frame, each neighboring one of the plurality of integer-sample reference blocks, wherein each of the plurality of integer-sample template cost values is determined by calculating a difference between the block template region of the current frame and a corresponding one of the plurality of integer-sample template regions of the current frame; and

determine, from the reference area of the current frame, a plurality of fractional-sample template regions of the current frame, each neighboring one of the plurality of fractional-sample reference blocks, wherein each of the plurality of fractional-sample template cost values is determined by calculating a difference between the block template region of the current frame and a corresponding one of the plurality of fractional-sample template regions of the current frame.

16 . The electronic device according to claim 14 , wherein the one or more computer-executable instructions, when executed by the at least one processor, further cause the electronic device to:

sub-sample the reference area based on the block unit by a sub-sampling factor to determine the plurality of integer-sample reference blocks;

determine a plurality of intermediate reference blocks from the plurality of integer-sample reference blocks based on the plurality of integer-sample template cost values; and

determine the plurality of fractional-sample reference blocks, each neighboring one of the plurality of intermediate reference blocks.

17 . The electronic device according to claim 16 , wherein the one or more computer-executable instructions, when executed by the at least one processor, further cause the electronic device to:

determine the sub-sampling factor for the block unit from the video data.

18 . The electronic device according to claim 14 , wherein:

the reference area includes a plurality of reconstructed samples reconstructed prior to reconstructing the block unit; and

each of the plurality of fractional-sample reference blocks is determined by using an interpolation filter to filter, respectively, at least one of the plurality of reconstructed samples.