H.264 intra coding with transforms based on prediction inaccuracy modeling

Abstract

In intra video coding, intra frames are predicted with intra prediction and the prediction residual signal is encoded. In many transform-based video coding systems, intra prediction residuals are encoded with transforms. For example, the Discrete Cosine Transform (DCT) and the Asymmetric Discrete Sine Transform (ADST) are used for intra prediction residuals in many coding systems. In the recent work, a set of transforms based on prediction inaccuracy modeling (PIM) has been proposed. These transforms are developed based on the observation that much of the residual non-stationarity is due to the use of an inaccurate prediction parameter. These transforms are shown to be effective for non-stationarity that arises in directional intra prediction residuals. In this paper, we implement the transforms based on prediction inaccuracy modeling on the H.264 intra coding system. The proposed transform is used in hybrid with the ADST. We compare the performance of the hybrid transform with the ADST and show that a significant bit-rate reduction is obtained with the proposed transform.