CAJ | 학술논문

为了在改进的H.264上实现无再损帧内编码,该文提出了一种新的基于整数线性规划的优化clip算法及改进算法,解决了H.264多次编码中由当前clip模块和帧内预测运算引入的视频畸变问题,并且改进了现有帧内预测算法的代价函数以确保多次编码时后续编码器预测值与前次编码器预测值一致.实验结果显示,与现有帧内编码算法比较,基于整数线性规划理论的帧内编码算法完全消除了现有算法导致的多次编码时的图像降质现象,在改进的H.264编解码算法中实现了严格视频无再损编码.
위료재개진적H.264상실현무재손정내편마,해문제출료일충신적기우정수선성규화적우화clip산법급개진산법,해결료H.264다차편마중유당전clip모괴화정내예측운산인입적시빈기변문제,병차개진료현유정내예측산법적대개함수이학보다차편마시후속편마기예측치여전차편마기예측치일치.실험결과현시,여현유정내편마산법비교,기우정수선성규화이론적정내편마산법완전소제료현유산법도치적다차편마시적도상강질현상,재개진적H.264편해마산법중실현료엄격시빈무재손편마.
This paper addresses the video distortion of intra-frame coding in multigeneration, which is introduced by the current clip operation and intra-frame prediction. In order to implement the Re-Loss-Free (RLF) intra-frame coding in modified H.264, a novel optimal clipping algorithm based on Integer Linear Programming (ILP) and its improved algorithm are proposed. Furthermore, the cost function of intra-frame prediction is improved to guarantee later encoder the same prediction values with the former. Experimental results show that the ILP-based intra-frame coding method completely eliminates the video degradation and achieves superior performance in comparison with current intra-frame coding method in H.264.