Patent ID: 9420294
Filing Date: 2016-08-16
CPC Classification: H04N

Claim Text:
1. A video decoding method performed by a video decoder, comprising: deriving a prediction mode of a current block as an intra planar prediction mode; deriving neighboring reference samples of the current block, wherein the reference samples include left reference samples and upper reference samples; deriving a prediction sample of the current block based on the neighboring reference samples; and generating a reconstructed picture based on the prediction sample; wherein the prediction sample is derived based on bi-linear interpolation using 4 reference samples among the neighboring reference samples, wherein the 4 reference samples include a first reference sample located in the same row with the prediction sample, a second reference sample located in a lower side of the first reference sample, a third reference sample located in a same column with the prediction sample, and a fourth reference sample located in a right side of the third reference sample, and wherein the second reference sample is derived by using a sample located in a lower side of a lowest sample among the left reference samples adjacent to a left boundary of the current block, and the fourth reference sample is derived by using a sample located in a right side of a right-most sample among the upper reference samples adjacent to an upper boundary of the current block.