ENCODING METHOD, DECODING METHOD, ENCODER, AND DECODER

Abstract: an encoder includes circuitry and memory. using the memory, the circuitry performs a primary transform on a derived prediction error, performs a secondary transform on a result of the primary transform, quantizes a result of the secondary transform, and encodes a result of the quantization as data of an image. when a current block to be processed has a predetermined shape, the encoder performs the secondary transform using, among secondary transform basis candidates that are secondary bases usable in the secondary transform, only a secondary transform basis candidate having a size that is not largest size containable in the current block.

Inventor(s): Ryuichi KANOH, Tadamasa TOMA, Kiyofumi ABE, Takahiro NISHI

CPC Classification: H04N19/52 (PICTORIAL COMMUNICATION, e.g. TELEVISION)

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