对于大机动目标拦截问题,模式决策器是基于逻辑的集成估计导引系统(Integrated estimation and guidance,IEG)中的一个重要组件.为了保证系统的估计精度和制导性能,模式决策器的模式延迟应尽可能小.本文针对末制导场景,首先推导了离散...对于大机动目标拦截问题,模式决策器是基于逻辑的集成估计导引系统(Integrated estimation and guidance,IEG)中的一个重要组件.为了保证系统的估计精度和制导性能,模式决策器的模式延迟应尽可能小.本文针对末制导场景,首先推导了离散时间系统零控脱靶量的估计误差模型,然后在一致性约束条件下给出了系统最大可容许模式决策延迟的数值计算方法.本文的研究结果可为IEG系统中模式决策器的设计提供指标参考.展开更多
The H.264/AVC video coding standard uses an intra prediction mode with 4×4 and 16×16 blocks for luma and 8×8 blocks for chroma. This standard uses the rate distortion optimization (RDO) method to determ...The H.264/AVC video coding standard uses an intra prediction mode with 4×4 and 16×16 blocks for luma and 8×8 blocks for chroma. This standard uses the rate distortion optimization (RDO) method to determine the best coding mode based on the compression performance and video quality. This method offers a large improvement in coding efficiency compared to other compression standards, but the computational complexity is greater due to the various intra prediction modes. This paper proposes a fast intra mode decision algorithm for real-time encoding of H.264/AVC based on the dominant edge direction (DED). The DED is extracted using pixel value summation and subtraction in the horizontal and vertical directions. By using the DED, three modes instead of nine are chosen for RDO calculation to decide on the best mode in the 4×4 luma block. For the 16×16 luma and the 8×8 chroma, only two modes are chosen instead of four. Experimental results show that the entire encoding time saving of the proposed algorithm is about 67% compared to the full intra search method with negligible loss of quality.展开更多
文摘对于大机动目标拦截问题,模式决策器是基于逻辑的集成估计导引系统(Integrated estimation and guidance,IEG)中的一个重要组件.为了保证系统的估计精度和制导性能,模式决策器的模式延迟应尽可能小.本文针对末制导场景,首先推导了离散时间系统零控脱靶量的估计误差模型,然后在一致性约束条件下给出了系统最大可容许模式决策延迟的数值计算方法.本文的研究结果可为IEG系统中模式决策器的设计提供指标参考.
基金Project (No. IITA-2009-(C1090-0902-0011)) supported by the Ministry of Knowledge Economy of Korea under the ITRC Support Program supervised by the IITA
文摘The H.264/AVC video coding standard uses an intra prediction mode with 4×4 and 16×16 blocks for luma and 8×8 blocks for chroma. This standard uses the rate distortion optimization (RDO) method to determine the best coding mode based on the compression performance and video quality. This method offers a large improvement in coding efficiency compared to other compression standards, but the computational complexity is greater due to the various intra prediction modes. This paper proposes a fast intra mode decision algorithm for real-time encoding of H.264/AVC based on the dominant edge direction (DED). The DED is extracted using pixel value summation and subtraction in the horizontal and vertical directions. By using the DED, three modes instead of nine are chosen for RDO calculation to decide on the best mode in the 4×4 luma block. For the 16×16 luma and the 8×8 chroma, only two modes are chosen instead of four. Experimental results show that the entire encoding time saving of the proposed algorithm is about 67% compared to the full intra search method with negligible loss of quality.
