| 摘要 |
Disclosed is a method and associated device for predicting a portion of an image using an intra prediction process. The method comprises deriving samples from at least one reference image portion (602) and generating, from these derived samples, by the intra prediction process, at least one prediction image portion corresponding to the image portion to be predicted (603 & Figure 7A, 704). A parametric displacement transformation (such as a 1D, 2D or affine transformation) is applied to the derived samples and/or the prediction image portion (604 & Figure 7A, 703.) Methods and devices for encoding and decoding images using the disclosed method are also described. The use of the parametric displacement transformation is designed to reduce losses in the coding efficiency induced by spatial misalignment of reference sample used in the coding process. The transformation can correct slight misalignments of reference samples which may improve the coding efficiency by reducing the energy of the prediction signal. |
