Image encoder, image decoder, and non-transitory computer-readable recording medium

Abstract

An image encoder is provided, which includes circuitry and a memory coupled to the circuitry. The circuitry, in operation, performs a partition syntax operation including: splitting an image block into a plurality of partitions including a first partition having a non-rectangular shape (e.g., a triangular shape) and a second partition based on a partition parameter indicative of the splitting; encoding the first partition and the second partition; and writing one or more parameters including the partition parameter into a bitstream.