Patent ID: 8184698

Claim:
A method of decoding a video signal, comprising: obtaining, by a demultiplexing unit, inter-layer prediction identification information, the inter-layer prediction identification information indicating whether a current block of an enhanced layer is coded by using inter-layer prediction; obtaining, by the demultiplexing unit, quality identification information, the quality identification information identifying an image quality of a picture including the current block; obtaining, by the demultiplexing unit, prediction constraint information based on the inter-layer prediction identification information and the quality identification information, the prediction constraint information indicating whether it is constrained to use an intra-base prediction mode in predicting a current block when a corresponding block covers at least two slices of the base layer; and decoding, by an enhanced layer decoding unit, the current block by using the intra-base prediction mode when the prediction constraint information indicates it is not constrained to use the intra-base prediction mode in predicting the current block in case that the corresponding block covers at least two slices of the base layer, wherein the intra-base prediction mode is a mode for predicting the current block of the enhanced layer based on the corresponding block of the base layer, and the corresponding block is coded in intra mode.