METHOD OF GENERATING QUANTIZED BLOCK

摘要

Provided is a method that derives an intra prediction mode of a prediction unit, selects an inverse scan pattern of a current transform unit among a diagonal scan, a vertical scan and a horizontal scan based on the intra prediction mode and a size of the transform unit, and generates a quantized block by inversely scanning significant flags, coefficients signs and coefficient levels according to the selected inverse scan pattern. If the transform unit is larger than a predetermined size, multiple subsets are generated and inversely scanned. Therefore, the amount of coding bits of the residual block is reduced by determining the scan pattern based on the size of the transform unit and the intra prediction mode, and by applying the scan pattern to each subset. Also, the signaling bits decreases by generating MPM group adaptively according to the neighboring intra prediction modes.

主权项

1. A method of generating a quantized block, comprising:
deriving an intra prediction mode of a current prediction unit using an MPM group including three intra prediction modes which are determined according to left and above intra prediction modes of the current prediction unit; selecting an inverse scan pattern based on the intra prediction mode and a size of a transform unit; and generating the quantized block by inversely scanning significant flags, coefficient signs and coefficient levels according to the selected inverse scan pattern, wherein the inverse scan pattern is one of a diagonal scan, a vertical scan and a horizontal scan, wherein when the left intra prediction mode and the above intra prediction mode are same each other and the left intra prediction mode is one of two non-directional intra prediction modes, the MPM group includes the two non-directional intra prediction modes and a vertical mode, and wherein when only one of the left intra prediction mode and the above intra prediction mode is available one of the two non-directional intra prediction modes, the MPM group includes the two non-directional intra prediction modes and a vertical mode.