| CPC H04N 19/119 (2014.11) [H04N 19/176 (2014.11); H04N 19/46 (2014.11); H04N 19/91 (2014.11)] | 11 Claims |
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1. A method of decoding an image, comprising:
determining whether to split a first coding block or not;
in response to a determination of split the first coding block, split the first coding block into three second coding blocks by using two vertical partitioning lines or two horizontal partitioning lines; and
split a second coding block, which is one of the three second coding blocks, into two third coding blocks by using a single vertical partitioning line or a single horizontal partitioning line,
wherein in response to the second coding block being middle one of the three second coding blocks, only a partitioning line, perpendicular to partitioning lines used to split the first coding block, is allowed to the second coding block,
wherein the method further comprises:
determining a division type of a third coding block, which is one of the two third coding blocks, from a plurality of division type candidates pre-defined in a decoding apparatus,
wherein the plurality of division type candidates includes a first candidate of a non-division type, a second candidate of dividing a coding block into two transform blocks, and a third candidate of dividing a coding block into four transform blocks,
wherein a transform block is determined by dividing the third coding block based on the division type, and
wherein a residual sample of the transform block is obtained by performing inverse-transform on the transform block.
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