Patent ID: 9154803
Filing Date: 2015-10-06
Classification: H04N

Abstract:
1. A method of encoding a video signal, comprising: deriving reference samples based on neighboring samples adjacent to a current block, the reference samples being used for intra prediction of the current block; and performing the intra prediction of the current block using the reference samples, wherein deriving the reference samples comprises: when the neighboring samples adjacent to the current block include an unavailable sample which is not used for the intra prediction of the current block, performing a substitution of the unavailable sample using a sample which is present on one side of the unavailable sample, wherein when the unavailable sample is a left neighboring sample of the current block and is not a top-left neighboring sample, the sample which is present on one side of the unavailable sample is a bottom neighboring sample of the unavailable sample and the substitution of the unavailable sample is performed using only the bottom neighboring sample of the unavailable sample, without referring to a top neighboring sample of the unavailable sample, and wherein when the unavailable sample is a top neighboring sample of the current block, the sample which is present on one side of the unavailable sample is a left neighboring sample of the unavailable sample.