APPARATUS OF DECODING VIDEO DATA

摘要

Provided is an apparatus that includes an inverse scanning unit configured to an inverse scan pattern to the quantized coefficient components to generate a quantized block, an inverse quantization unit configured to generate a quantization parameter and to inverse-quantize the quantized block to generate a transformed block, an inter prediction unit configured to derive motion information and to generate a prediction block, and an adder configured to generate a reconstructed block. The transform unit is larger than a 4×4 block, each of the quantized coefficient components are inversely scanned in the unit of subset to generate multiple subsets, and the multiple subsets are inversely scanned to generate the quantized block. Accordingly, the coding efficiency of the motion information is improved by including various motion vector candidates. Also, the amount of coding bits of the residual block is reduced by applying diagonal scan pattern to each subset.

主权项

1. An apparatus of decoding video data, comprising:
an entropy decoding unit configured to extract quantized coefficient components and inter prediction information from a received bit stream; an inverse scanning unit configured to apply an inverse scan pattern to the quantized coefficient components to generate a quantized block having a size of a transform unit; an inverse quantization unit configured to generate a quantization parameter and to inverse-quantize the quantized block to generate a transformed block; an inverse transform unit configured to generate a residual block by inverse- transforming the transformed block; an inter prediction unit configured to derive motion information and to generate a prediction block; and an adder configured to generate a reconstructed block using the residual block and the prediction block, wherein when the transform unit is larger than a 4×4 block, the quantized coefficient components are inversely scanned to generate multiple subsets, and the multiple subsets are inversely scanned according to a diagonal scan to generate the quantized block, and when at least two of a left quantization parameter, an above quantization parameter and a previous quantization parameter are available, the quantization parameter is generated by adding a differential quantization parameter and an average of two quantization parameter determined according to a predetermined order.