`
`i. An encoder, comprising:
`
`circuitry: and
`
`memory coupled to the circuitry,
`
`wherein the circuitry, in operation:
`
`determines whether a shape of a current chroma block to be
`
`split in an image satisfies afirst condition:
`
`generates one or more second candidates for a block partitioning
`
`method by eliminating one or more predetermined candidates from a plurality
`
`of first candidates for a block partitioning method when the shape of the
`
`current chroma block satisfies the first condition,
`
`selects a block partitioning method from among the one or more
`
`second candidates; and
`
`splits
`
`the current chroma block according to the block
`
`partitioning method selected.
`
`2. The encoder according to claim 1, wherein
`
`the first condition is that the shape of the current chroma block is a
`
`rectangle and a length ofa shorterside of the current chroma block is equal toa
`
`20
`
`first value.
`
`3. The encoder according to claim 1, wherein
`
`the first condition is that the shape of the current chroma block is a
`
`vertically elongated block and a width of the current chromablock is equal toa
`
`25
`
`first value.
`
`4, The encoder according to claim 3, wherein the first value is one of16,
`
`130
`
`
`
`&, 4, and 2 pixels.
`
`5. The encoder according to claim 4, wherein
`
`the plurality of first candidates include at least a ternary splitting in
`
`Or
`
`vertical direction and the one or more second candidates exclude the ternary
`
`splitting in vertical direction.
`
`6.Adecoder, cormprising:
`
`circuitry, and
`
`memory coupled to the circuitry,
`
`wherein the circuitry, in operation:
`
`parses, from an encoded bitstream generated by encoding an
`
`image, block partitioning information relating to a block partitioning method
`
`according to which a current chroma block to be split in the image is split; and
`
`splits the current chroma block based on the block partitioning
`
`information parsed, whereim
`
`when a shape of the current chroma block satisfies a first condition, the
`
`block partitioning information is generated by G) generating one or more
`
`second candidates for a block partitioning method by eliminating one or more
`
`20
`
`predetermined candidates from a plurality of first candidates for a block
`
`partitioning method andGi) selecting a block partitioning method from among
`
`the one or more second candidates.
`
`7, The decoder according to claim 6, wherein
`
`25
`
`the first condition is that the shape of the current chroma block is a
`
`rectangle and a length of a shorterside of the current chroma block is equaltoa
`
`first value,
`
`131
`
`
`
`8. The decoder according to claim 6, wherein
`
`the first condition is that the shape of the current chroma block is a
`
`vertically elongated block and a width of the current chroma block is equal toa
`
`first value.
`
`93, The decoder according to claim 8, wherein the first value is one of 16,
`
`8, 4, and 2 pixels.
`
`10. The decoder according to claim 9, wherein
`
`the plurahty of first candidates include at least a ternary splitting in
`
`vertical direction and the one or more second candidates exclude the ternary
`
`splitting in vertical direction.
`
`182
`
`
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