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B 슬라이스의 압축 효율 향상을 위한 개선된 양방향 대칭 예측 부호화 방법
정봉수(Bongsoo Jung),원광현(Kwanhyun Won),전병우(Byeungwoo Jeon) 한국방송·미디어공학회 2009 방송공학회논문지 Vol.14 No.1
A bi-directionaJ symmetric prediction technique has been developed to improve coding efticiency of B-slice and to reduce the computational complexity required to estimate two motion vectors. On the contrary to the conventional bi-directional mode which encodes both forward and backward motion vectors, it only encodes a single forward motion vector, and the missing backward motion vector is derived in a symmetric way from the forward motion vector using temporal distance between forward/backward reference frames to and from the current B picture. Since the backward motion vector is derived from the forward motion vector, it can halve the computational complexity for motion estimation, and also reduces motion vector data to encode. This technique always derives the backward motion vector from the forward motion vector, however, there are cases when the forward motion vector is better to be derived from the backward motion vector especially in scene changes. In this paper, we generalize the idea of the symmetric coding with forward motion vector coding, and propose a new symmetric coding with backward motion vector coding and adaptive selection between the conventional symmetric mode and the proposed symmetric mode based on rate-distortion optimization.
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