2020 年 8 巻 1 号 p. 40-48
We propose a disparity compensation framework for efficient light-field coding. We have proposed a novel lightfield coding scheme of approximating a light field with the sum of weighted binary patterns. This coding scheme achieves comparable performance to the modern video coding standards H.265/HEVC and enables a dramatically simple decoding process, but its computational complexity for encoding is quite high. We have also proposed a progressive coding scheme that progressively encodes the target light field with a small number of weighted binary patterns in a step-by-step manner. The progressive scheme remarkably mitigates the computational complexity, but its rate-distortion performance is degraded. To address the above problems, we design a disparity compensation framework, which can be applied to the existing progressive coding, to improve the rate-distortion performance while keeping feasible computational complexity. Experimental results demonstrate that the proposed method improves the rate-distortion performance of the progressive coding without a computational complexity explosion.