CAJ | 학술논문

提出了H.264码率控制改进算法.首先,基于帧间运动估计残差(mean absolutely difference,MAD)的空间和时间相关性提出了"十字"MAD预测模型;为了平衡缓冲的占有率,在分配帧比特时将前一帧的比特使用情况作为当前帧比特分配时的惩罚因子;最后,结合视频文字对象提取技术实现了基于文字对象的宏块比特分配以及量化步长的计算.实验结果表明,改进算法能在准确控制码率的情况下,提高输出序列的峰值信噪比.
제출료H.264마솔공제개진산법.수선,기우정간운동고계잔차(mean absolutely difference,MAD)적공간화시간상관성제출료"십자"MAD예측모형;위료평형완충적점유솔,재분배정비특시장전일정적비특사용정황작위당전정비특분배시적징벌인자;최후,결합시빈문자대상제취기술실현료기우문자대상적굉괴비특분배이급양화보장적계산.실험결과표명,개진산법능재준학공제마솔적정황하,제고수출서렬적봉치신조비.
A new rate control scheme in H.264 coding standard was proposed.The scheme includes+shape MAD prediction model based on space and time relativity of MAD.We used former frame bit usage as penalty factor to modify the bit-allocation rule to balance buffer share.Furthermore,combining video text extraction techniques,the method realized macro bit allocation and quantization step based on text area.Experimental results show that the new rate-control scheme can control the bits very well and the average PSNR is improved.