Method and apparatus for encoding video by compensating for pixel value according to pixel groups, and method and apparatus for decoding video by the same

An apparatus for video encoding, the apparatus comprising at least one processor configured to:

• generate information about compensation type of a current block for indicating a band type or an edge type, and
• generate a compensation value applied to at least one pixel of the current block to perform pixel value compensation,
• wherein:
• the at least one processor is configured to generate the information about compensation type of a current block to indicate the band type when the at least one pixel is categorized as a band and the compensation value corresponds to the band,
• when the at least one pixel is categorized as an edge level and the compensation value corresponds to the edge level, the at least one processor is configured to generate the information about compensation type of the current block to indicate the edge type,
• wherein the band is one of a plurality of bands, and
• the edge level is one of a plurality of edge levels.

A method of video encoding, performed by at least one processor, the method comprising:

• generating information about compensation type of a current block for indicating a band type or an edge type;
• and
• generating a plurality of compensation values applied to at least one pixel of the current block to perform pixel value compensation,
• wherein:
• when the at least one pixel is categorized as a band and a compensation value corresponds to the band, the information about compensation type of the current block is generated to indicate the band type, wherein the band is one of a plurality of band, the plurality of compensation values correspond to the plurality of bands, and the compensation value corresponding to the band is one of the plurality of compensation values;
• when the at least one pixel is categorized as an edge level and the compensation value corresponds to the edge level, the information about compensation type of the current block is generated to indicate the edge type, wherein the edge level is one of a plurality of edge levels, a plurality of compensation values correspond to the plurality of edge levels, and the compensation value corresponding to the edge level is one of the plurality of compensation values.

An apparatus for video encoding, the apparatus comprising at least one processor configured to:

• generate information about compensation type of a current block for indicating a band type or an edge type, and
• generate a plurality of compensation values applied to at least one pixel of the current block to perform pixel value compensation,
• wherein:
• the at least one processor is configured to generate the information about compensation type of a current block to indicate the band type when the at least one pixel is categorized as a band and a compensation value corresponds to the band, wherein the band is one of a plurality of bands, the plurality of compensation values correspond to the plurality of bands, and the compensation value corresponding to the band is one of the plurality of compensation values,
• when the at least one pixel is categorized as an edge level and the compensation value corresponds to the edge level, the at least one processor is configured to generate the information about compensation type of the current block to indicate the edge type, wherein the edge level is one of a plurality of edge levels, the plurality of compensation values correspond to the plurality of edge levels, and the compensation value corresponding to the edge level is one of the plurality of compensation values.

An apparatus for video encoding, the apparatus comprising at least one processor configured to:

• generate information about compensation type of a current block for indicating a band type or an edge type;
• and
• generate a plurality of compensation values applied to at least one pixel of the current block to perform pixel value compensation,
• wherein:
• the processor is configured to generate the information about compensation type of a current block to indicate the band type when the at least one pixel is categorized as a band and a compensation value corresponds to the band, wherein the band is one of a plurality of bands, the plurality of compensation values correspond to the plurality of bands, and the compensation value corresponding to the band is one of the plurality of compensation values,
• when the at least one pixel is categorized as an edge level and the compensation value corresponds to the edge level, the processor is configured to generate the information about compensation type of the current block to indicate an edge type, wherein the edge level is one of a plurality of edge levels, the plurality of compensation values correspond to the plurality of edge levels, and the compensation value corresponding to the edge level is one of the plurality of compensation values,
• wherein the edge level is determined by comparing the at least one pixel and neighboring pixels of the at least one pixel, and
• the band is one among bands corresponding to a range of sample values of the at least one pixel.

A non-transitory computer-readable storage medium storing a bit stream generated by at least one processor for performing video encoding, the bit stream comprising:

• information about compensation type of a current block for indicating a band type or an edge type;
• and
• a compensation value applied to at least one pixel of the current block to perform pixel value compensation,
• wherein, when the information about compensation type of the current block indicates the band type, the compensation value corresponds to a band,
• when the information about compensation type of the current block indicates the edge type, the compensation value corresponds to an edge level,
• wherein the band is one of a plurality of bands, and
• the edge level is one of a plurality of edge levels.

A non-transitory computer-readable storage medium storing a bit stream generated by at least one processor for performing video encoding, the bit stream comprising:

• information about compensation type of a current block for indicating a band type or an edge type;
• and
• a plurality of compensation values applied to at least one pixel of the current block to perform pixel value compensation;
• wherein, when the information about compensation type of the current block indicates the band type, a compensation value corresponds to a band, the band is one of a plurality of bands, the plurality of compensation values correspond to the plurality of bands, and the compensation value corresponding to the band is one of the plurality of compensation values,
• when the information about compensation type of the current block indicates the edge type, the compensation value, corresponds to an edge level, the edge level is one of a plurality of edge levels, the plurality of compensation values correspond to the plurality of edge levels, and the compensation value corresponding to the edge level is one of the plurality of compensation values.

A non-transitory computer-readable storage medium storing a bit stream generated by at least one processor for performing video encoding, the bit stream comprising:

• information about compensation type of a current block for indicating a band type or an edge type;
• and
• a compensation value applied to at least one pixel of the current block to perform pixel value compensation,
• wherein, when the information about compensation type of the current block indicates the band type, the compensation value corresponds to a band,
• when the information about compensation type of the current block indicates the edge type, the compensation value corresponds to an edge level,
• wherein the band is one among a plurality of bands corresponding to a range of sample values of the at least one pixel, and
• the edge level is one of a plurality of edge levels.

A non-transitory computer-readable storage medium storing a bit stream generated by at least one processor for performing video encoding, the bit stream comprising:

• information about compensation type of a current block for indicating a band type or an edge type;
• and
• a compensation value applied to at least one pixel of the current block to perform pixel value compensation,
• wherein, when the information about compensation type of the current block indicates the band type, the compensation value corresponds to a band,
• when the information about compensation type of the current block indicates the edge type, the compensation value corresponds to an edge level,
• wherein the band is one of a plurality of bands, and
• the edge level is one of a plurality of edge levels, and
• the edge level is determined by comparing the at least one pixel and neighboring pixels of the at least one pixel.

A non-transitory computer-readable storage medium storing a bit stream to be decoded by at least one processor for performing video decoding, the bit stream comprising:

• information about compensation type of a current block for indicating a band type or an edge type;
• and
• a plurality of compensation values applied to at least one pixel of the current block to perform pixel value compensation,
• wherein, when the information about compensation type of the current block indicates the band type, a compensation value corresponds to a band, the band is one of a plurality of band, the plurality of compensation values correspond to the plurality of bands, and the compensation value corresponding to the band is one of the plurality of compensation values,
• when the information about compensation type of the current block indicates the edge type, the compensation value corresponds to an edge level, the plurality of compensation values correspond to a plurality of edge levels, and the compensation value corresponding to the edge level is one of the plurality of compensation values, the edge level is one of the plurality of edge levels and determined by comparing the at least one pixel and neighboring pixels of the at least one pixel.