Back to results
US 9,288,486 B2Granted
Method and apparatus for scalably encoding and decoding video signal
AssigneeLG Electronics Inc.
InventorsSeung Wook Park, Ji Ho Park, Byeong Moon Jeon, Doe Hun Yoon, Hyun Wook Park
Life of this patent
Estimating the term…
Abstract
In one embodiment, the method includes predicting at least a portion of a current image in a current layer based on at least a residual coded portion of a base image in a base layer, a reference image, shift information for samples in the predicted current image, and offset information indicating a position offset between at least one boundary pixel of the reference image and at least one boundary pixel of the current image. The residual coded portion represents difference pixel data.
Claims6
A method for decoding a video signal, comprising:
- decoding a base layer image in a base layer;
- determining whether offset information is transmitted through one of sequence parameter set and a slice header in an enhanced layer;
- obtaining phase shift information between a luma sample and a chroma sample in an enhanced layer in a slice header in an enhanced layer based on the determining;
- obtaining offset information indicating a position difference between at least one boundary pixel of an up-sampled image and at least one boundary pixel of a current image in the enhanced layer for an inter-layer prediction between the base layer and the enhanced layer, wherein the enhanced layer differs from the base layer in an aspect ratio or a spatial resolution, the up-sampled image representing an up-sampled base layer image;
- performing motion prediction to decode an inter-coded block of the current image in the enhanced layer using a motion vector of the base layer;
- and
- performing texture prediction to decode an intra-coded block of the current image in the enhanced layer based on the base layer image, the performing texture prediction including:
- obtaining position information of the intra-coded block in the enhanced layer;
- obtaining position information of a reference block in the base layer base layer based on the offset information and the position information of the intra-coded block;
- obtaining reference pixel values in the base layer based on the position information of the reference block;
- and
- decoding the intra-coded block in the enhanced layer based on the reference pixel values.
9 more elements
An apparatus for decoding a video signal, comprising:
- a base layer decoder configured to decode a base layer image in a base layer;
- a demuxer configured to determine whether offset information is transmitted through one of sequence parameter set and a slice header in an enhanced layer and obtain phase shift information between a luma sample and a chroma sample in an enhanced layer in a slice header in an enhanced layer based on the determining,
- obtain offset information indicating a position difference between at least one boundary pixel of an up-sampled image and at least one boundary pixel of a current image in the enhanced layer for an inter-layer prediction between the base layer and the enhanced layer, wherein the enhanced layer differs from the base layer in an aspect ratio or a spatial resolution, the up-sampled image representing an up-sampled base layer imaged;
- a motion decoding unit configured to perform motion prediction to decode an inter-coded block of the current image in the enhanced layer using a motion vector of the base layer;
- and
- a texture decoding unit configured to obtain position information of the intra-coded block in the enhanced layer,
- obtain position information of a reference block in the base layer base layer based on the offset information and the position information of the intra-coded block,
- obtain reference pixel values in the base layer based on the position information of the reference block, and
- decode an intra-coded block of the current image in the enhanced layer based on the reference pixel values.
6 more elements
Dependencies are inferred from the claim text.