ENCODING METHOD, DECODING METHOD, ENCODING DEVICE AND DECODING DEVICE

摘要

Disclosed is an encoding method including a transform step (S110a) for transforming an input signal; a quantization step (S120) for quantizing the transform output signal; and an entropy encoding step (S130) for entropy encoding quantized coefficients. The transform step (S110a) includes a first transform step (S112) for generating the first transform output signal by way of performing a first transform on the input signal using a first transform coefficient; and a second transform step (S116a) for generating a second transform output signal by way of performing a second transform using a second transform coefficient on a first partial signal which is a portion of the first transform output signal, and outputting a transform output signal which includes the generated second transform output signal and a second partial signal which is the portion of the first transform output signal excluding the first partial signal. In the second transform step (S116a), either the range of the first transform output signal for the second transform as the first partial signal, and/or the second transform coefficient, is temporally or spatially adaptively determined.