Performance Improvements with Two-Source Decomposition and DCT-WHT for Transform Coding of Interframe Prediction Errors

프레임간 예측오차의 신호분리 및 DCT-WHT를 이용한 변환 부호화의 성능 개선

BMA, which is generally adopted in low bit-rate motion-compensated coding, performs properly under an assumption of rigid-body motion of moving objects. Since, however, the assumption can not be held in practical coding , the prediction errors with low correlation are generated. For effective transform codings of the interframe prediction errors, we propose a new transform coding technique which decomposes the prediction errors into two sources and then transforms them with DCT and WHT consecutively. The performance of the proposed algorithm is compared to those of the two conventional algorithms in terms of bit rate and subjective image quality.