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The purpose of this paper is to improve allocation of the number of bits by estimating the target bits in H.264/AVC rate control.In the scheme,an enhancement method of the target unit-layer bit allocation is proposed,which uses a frame and unit complexity estimation to improve the existing mean absolute difference(MAD)complexity measurement.Using the statistical characteristics,we obtain change of occurrence bit about QP to apply the bit amount by QP from the video characteristics in the estimated bit amount of the current frame.Simulation results show that not only the proposed rate control scheme could achieve time saving of more than 99% over existing rate control algorithm,but also PSNR and bit rate were almost the same as the performance in all the sequences. 相似文献
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码率控制作为H.264里极为重要的一个环节,在参考软件Joint Model(JM)中已给出算法.由于JM模型采用线性模型预测MAD以获得模式选择所需要的量化步长,这种算法运算量较大且MAD预测不够准确,因而造成码率控制的结果不准确.本文针对这种缺点,在原有算法的基础上提出一种新的基于预测激励和时空相关的MAD预测算法,同时还给出一种根据修正空间来调节码率的方法.仿真结果显示,采用这种改进算法的H.264编码器不仅取得更低比特率,而且有效提高了PSNR,控制的精确度也有所提高. 相似文献
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提出了一种基于Sobel边缘算子的宏块层H.264码率控制方案. 该方案利用Sobel边缘
算子,提高了平均绝对误差预测准确性和头信息比特预测准确性,继而在Sobel边缘算子计
算结果的基础上采用一种新的历史数据点选择方法,进一步提升了码〖JP9〗率-〖JP〗量化
模型的准确性. 实验表明,与传统的H.264/AVC码率控制算法相比,该方案能更精确地控
制码率并获得最大08?dB的峰值信噪比增益. 相似文献
算子,提高了平均绝对误差预测准确性和头信息比特预测准确性,继而在Sobel边缘算子计
算结果的基础上采用一种新的历史数据点选择方法,进一步提升了码〖JP9〗率-〖JP〗量化
模型的准确性. 实验表明,与传统的H.264/AVC码率控制算法相比,该方案能更精确地控
制码率并获得最大08?dB的峰值信噪比增益. 相似文献
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Fatemeh Maleki Saeed Mehri Abdollah Aghaie Hamid Shahriari 《Quality and Reliability Engineering International》2020,36(6):2187-2201
One of the most widely used multivariate control charts is the Hotelling T2. In order to construct a Hotelling T2 control chart, the mean vector (μ) and the variance–covariance matrix (Σ) must be first estimated. The classical estimators of μ and Σ are usually used to design Hotelling T2 control chart. The classical estimators are sensitive to the presence of outliers. One way to deal with outliers is to use robust estimators. In this study, a robust T2 control chart is proposed. The mean vector is obtained from the sample median. The median absolute deviation and the comedian are used as the estimates of the elements of the variance–covariance matrix. The proposed robust estimators of the mean vector and the variance–covariance matrix are compared with the sample mean vector and the sample variance–covariance matrix, and the M estimator of these parameters, through efficiency and robustness measures. The performances of the proposed robust T2 control chart and the classical and the M estimators are also compared by means of average run length. Simulation results reveal that the proposed robust T2 control chart has much better performance than the traditional Hotelling T2 and similar performance to the M estimator in detecting shifts in process mean vector. Use of other robust estimators to estimate the process parameters is an area for further research. 相似文献
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