Method of decoding moving picture
AssigneeM&K Holdings Inc.
InventorSoo Mi Oh
Life of this patent
Estimating the term…
Abstract
Provided is a method that generates a prediction block of a current prediction unit, and generates a residual block of the current prediction unit. To generate the prediction block, a reference picture index and motion vector difference of the current prediction unit are obtained from a received bit stream, spatial and temporal motion vector candidates are derived to construct a motion vector candidate list. A motion vector predictor is selected and a motion vector of the current prediction unit is restored to generate the prediction block. Therefore, the motion vector encoded effectively using spatial and temporal candidates is correctly recovered and the complexity of a decoder is reduced.
Claims4
A method of decoding a moving picture, comprising:
- a step of generating a prediction block of a current prediction unit;
- and
- a step of generating a residual block of the current prediction unit,
- wherein the step of generating the prediction block of the current prediction unit includes the steps of:
- obtaining a reference picture index and motion vector difference of the current prediction unit from a received bit stream;
- constructing a motion vector candidate list using available spatial and temporal motion vector candidates;
- determining a motion vector candidate indicated by a motion vector index as a motion vector predictor and restoring a motion vector of the current prediction unit using the motion vector difference and the motion vector predictor;
- and
- generating a prediction block of the current prediction unit using the restored motion vector and the reference picture index,
- wherein the temporal motion vector candidate is a first available motion vector encountered when retrieving two blocks corresponding to the current prediction unit or a motion vector of a predetermined block,
- wherein the step of generating the residual block of the current prediction unit includes the steps of:
- entropy-decoding residual signals;
- inversely scanning the residual signals using a first scan pattern;
- restoring a transform block by inversely quantizing a quantized transform block;
- and
- inversely transforming the transform block, and
- wherein, when a size of the transform block is larger than a first reference size, the residual signals are inversely scanned in a unit of subsets and a scan pattern for scanning a plurality of subsets is the same as a scan pattern for scanning residual signals of each subset.
Dependencies are inferred from the claim text.