Patent ID: 9674531
Date: 2017-06-06
CPC Classifications: H04N

Claim:
1. A video decoding method for decoding a video signal, the method being operable in respect of a 4:2:0 format video signal and a 4:2:2 format video signal, the method comprising: generating prediction units of a current image from one or more stored images preceding the current image, the generating step comprising: in respect to the 4:2:0 format video signal, deriving samples of an interpolated prediction unit by using an 8-tap ×4 luminance filter applied vertically and horizontally to a stored luminance prediction unit and by applying a 4-tap ×8 chrominance filter horizontally and vertically to a stored chrominance prediction unit; and in respect to the 4:2:2 format video signal, deriving samples of an interpolated chrominance prediction unit by applying the same 4-tap ×8 chrominance filter horizontally and vertically to a stored chrominance prediction unit using only alternate fractional-position results as interpolated samples in the vertical direction.