Apparatus for Encoding Moving Picture

摘要

Provided is an apparatus for encoding a moving picture that determines a quantization step size of a previous coding block according to scan order as the quantization step size predictor of the current coding block when a quantization step size of a left coding block of a current coding block and a quantization step size of an above coding block of the current coding block are unavailable and determines an available motion vector encountered first when retrieving motion vectors in the order of motion vector of a first predetermined position and motion vector of a second predetermined position in a reference picture as a temporal motion vector candidate. Therefore, it is possible to reduce the amount of coding bits required to encode motion information and the quantization step size of the current prediction block.

主权项

1. An apparatus for encoding a moving picture, comprising:
a picture division unit configured to determine a size and a prediction mode of each coding block; an inter prediction unit configured to determine a reference picture and a motion vector of a current block by performing motion estimation and extract a prediction block corresponding to the current block from the reference picture based on the motion vector when the current block is coded in inter prediction mode; a transform unit configured to transform a residual block obtained by calculating difference between the current block and the prediction block to generate a transform block; a quantization unit configured to determine a quantization step size of a current coding block and quantize the transform block using the quantization step size to generate a quantized transform block; a scanning unit configured to scan quantized transform coefficients of the quantized transform block to generate one-dimensional (1D) quantized transform coefficients; and an entropy coding unit configured to entropy-code the 1D quantized transform coefficients, wherein the motion vector predictor is an available spatial motion vector candidate or an available temporal motion vector candidate and the temporal motion vector candidate is an available motion vector encountered first when retrieving motion vectors in the order of motion vector of a first predetermined position and motion vector of a second predetermined position in a reference picture, and wherein, when the quantization step size of the left coding block of the current coding block and the quantization step size of the above coding block of the current coding block are unavailable, a quantization step size of previous coding block in scan order is determined as the quantization step size predictor of the current coding block.