A method for processing a video signal, comprising: receiving the video signal, the video signal including a current prediction unit and prediction mode information corresponding to the current prediction unit, the prediction mode information identifying a prediction mode for processing the current prediction unit (301; 501; 701; 801; 901; 1301; 1401; 1501; 1601; 1701; 1805; 1905; 2001; 2103; 2201; 2301; 2302; 2401; 2402; 2501; 2502; 2601; 2602; 2701; 2702) in intra mode, the prediction mode information representing a prediction direction of an intra prediction, parsing the prediction mode information from the video signal; and predicting current samples (a; b) of the current prediction unit using top neighboring reconstructed samples and left neighboring reconstructed samples adjacent to the current prediction unit, characterized in that, when an angular line corresponding to the prediction mode information passes through a point between two reconstructed samples (B, C) of the top neighboring reconstructed samples and a reconstructed sample of the left neighboring reconstructed samples and a current sample (a; b) lies in a path of the angular line, the predicting comprises: obtaining an estimated sample value for the point using a linear interpolation between the two reconstructed samples (B, C) of the top neighboring reconstructed samples; performing a linear interpolation between the estimated sample value and the reconstructed sample of the left neighboring reconstructed samples; and predicting the current sample (a; b) of the current prediction unit using a result of the linear interpolation between the estimated sample value and the reconstructed sample of the left neighboring reconstructed samples. receiving the video signal, the video signal including a current prediction unit and prediction mode information corresponding to the current prediction unit, the prediction mode information identifying a prediction mode for processing the current prediction unit (301; 501; 701; 801; 901; 1301; 1401; 1501; 1601; 1701; 1805; 1905; 2001; 2103; 2201; 2301; 2302; 2401; 2402; 2501; 2502; 2601; 2602; 2701; 2702) in intra mode, the prediction mode information representing a prediction direction of an intra prediction, parsing the prediction mode information from the video signal; and predicting current samples (a; b) of the current prediction unit using top neighboring reconstructed samples and left neighboring reconstructed samples adjacent to the current prediction unit, characterized in that, when an angular line corresponding to the prediction mode information passes through a point between two reconstructed samples (B, C) of the top neighboring reconstructed samples and a reconstructed sample of the left neighboring reconstructed samples and a current sample (a; b) lies in a path of the angular line, the predicting comprises: obtaining an estimated sample value for the point using a linear interpolation between the two reconstructed samples (B, C) of the top neighboring reconstructed samples; performing a linear interpolation between the estimated sample value and the reconstructed sample of the left neighboring reconstructed samples; and predicting the current sample (a; b) of the current prediction unit using a result of the linear interpolation between the estimated sample value and the reconstructed sample of the left neighboring reconstructed samples. obtaining an estimated sample value for the point using a linear interpolation between the two reconstructed samples (B, C) of the top neighboring reconstructed samples; performing a linear interpolation between the estimated sample value and the reconstructed sample of the left neighboring reconstructed samples; and predicting the current sample (a; b) of the current prediction unit using a result of the linear interpolation between the estimated sample value and the reconstructed sample of the left neighboring reconstructed samples.