Method of generating reconstructed block

摘要

Provided is a method that derives an intra prediction mode of a prediction unit, determines a size of a current block using transform size information, generates a prediction block of the current block according to the intra prediction mode, generating a residual block of the current block according to the intra prediction mode and generating a reconstructed block of the current block using the prediction block and the residual block. The sizes of the prediction block and the residual block are set equal to a size of a transform unit. Therefore, the distance of intra prediction becomes short, and the amount of coding bits of residual block is reduced by generating a prediction block very similar to original block. Also, the signaling bits required to signal intra prediction mode decrease by generating MPM group adaptively according to the neighboring intra prediction modes.

主权项

1. An apparatus for generating a reconstructed block, comprising:
an intra prediction unit for deriving an intra prediction mode of a current prediction unit using a Most Probable Mode (MPM) group including three intra prediction modes which are determined according to left and above intra prediction modes of the current prediction unit, and generating a prediction block according to the intra prediction mode; a residual block generating unit for generating a residual block by inversely scanning significant flags, coefficient signs and coefficient levels according to an inverse scan pattern to generate a quantized block, by inversely quantizing the quantized block using a quantization parameter to generate a transformed block and by inversely transforming the transformed block using an inverse transform matrix determined based on a size of transform unit; and an adder for generating a reconstructed block using the prediction block and the residual block, wherein a size of the prediction block is determined based on transform size information; and wherein when only one of the left intra prediction mode and the above intra prediction mode is available, the MPM group includes two non-directional intra prediction modes and a vertical mode if the available intra prediction mode is one of the two non-directional intra prediction modes, the MPM group includes the available intra prediction mode and the two non-directional intra prediction modes if the available intra prediction mode is one of directional intra prediction modes.