| 摘要 |
Disclosed are an encoding device, encoding method, decoding device, and decoding method that reduce the amount of computation required for an orthogonal transformation process or inverse orthogonal transformation process. A DWT unit (91) performs a DWT, which requires less computation than the KLT, on residual information. Then, KLT units (92-0 to 92-8) perform a separable KLT on low-frequency components of the residual information, obtained from the DWT, using KLT bases corresponding to intra prediction modes. The coefficients obtained from the KLT and the high-frequency components of the residual information, obtained from the DWT, are reversibly encoded. This technology can be applied, for example, to an image encoding device. |
