Three-dimensional rate-distortion function and comparison with some image-coding methods

Based on a 3-dimensional exponential covariance model for image sequences, a 3-dimensional rate-distortion function is obtained, and it is compared with some interframe transform and hybrid coding techniques. The computational problem of 3-dimensional complexity is reduced by the assumption that the covariance function is separable between the spatial and temporal covariances. It is shown that the interframe hybrid coding of moderate complexity is quite a good method for high bit rates.