ADAPTIVE INTRA-PREDICTION ENCODING AND DECODING METHOD

摘要

Disclosed is an adaptive intra-prediction encoding and decoding method. The adaptive intra-prediction encoding method comprises the following steps: providing a prediction unit to be encoded; determining the total number of prediction modes for intra-prediction in accordance with the size of the prediction unit; selecting a certain prediction mode on the basis of the displacement of a reference pixel among the determined total number of the prediction modes, and performing intra-prediction using the selected prediction mode; and transforming and quantizing the residual value, which is the difference between the prediction unit predicted by the intra-prediction and the current prediction unit, and entropy-encoding the transformed and quantized value. Thus, rate-distortion may be optimized and image quality and encoding speed may be improved.

主权项

1. A video decoding method comprising the steps of:
reconstructing a header information and a quantized residue by entropy-decoding received bit stream; performing inverse-quantization and inverse-transformation on the quantized residue to reconstruct a residue; selecting a prediction mode from a plurality of prediction modes and performing intra-prediction by using the selected prediction mode to generate a prediction unit; and reconstructing an image by adding the prediction unit and the residue, wherein the prediction unit corresponds to a leaf coding unit when a coding unit is split and reaches a maximum permissible depth, wherein when a planar intra prediction mode is activated, a predicted pixel value of an internal pixel of a current prediction unit is obtained by performing bilinear interpolation using (a) vertically and horizontally directional corresponding pixel values in previously decoded left side block and upper end block of the current prediction unit, and (b) vertically and horizontally directional corresponding internal boundary prediction pixel values in the current prediction unit.