Patent ID: 8831104
Filing Date: 2014-09-09
Classification: H04N

Abstract:
1. A method for decoding a video signal performed by a decoding apparatus, comprising: receiving the video signal, the video signal including a bitstream of an enhanced layer and a bitstream of a base layer; parsing first coding information from the bitstream of the enhanced layer, the first coding information indicating whether residual data of an image block in the enhanced layer is predicted from residual data of a corresponding block in the base layer; and decoding the video signal based on the first coding information, wherein the parsing comprises performing modeling of the first coding information based on second coding information, the second coding information indicating whether prediction information of the corresponding block in the base layer is used to decode the image block in the enhanced layer, the prediction information including a prediction mode, partition information and motion information, the prediction mode including an intra mode and an inter mode, the motion information including a motion vector and a reference index, and wherein the modeling includes, deriving a context index increment based on the second coding information and a context index offset for the first coding information; deriving quantization parameter information associated with a slice from the bitstream of the enhanced layer; obtaining an intermediate variable based on the context index increment and the quantization parameter information, the intermediate variable indicating a variable being used for an initial process of context modeling; and deriving an initial value of a probability coding function based on the intermediate value.