采样

Therefore, we need to resample the chroma values to achieve a 4:4:4 format.

因此，我们需要对色度值进行再采样，以达到4：4：4的格式。

On the other hand, if it's a 0, there is a 2:1 chroma subsampling between lines.

另一方面，如果它等于0，则两条线之间存在一次2：1的色度子采样。

Note that 4:2:2 is not the only chroma subsampling scheme.

应注意的是，4：2：2并非是唯一的色度子采样方案。

The third number, if it's the same as the second digit, implies no vertical subsampling of chroma.

第三个数，如果与第二个数相同的话，则意味着没有垂直方向上的色度子采样。

In this thesis, two important problems in the decoder project are discussed: sampling structure and chrominance demodulation.

本文主要研究数字视频解码器中的两个重要问题：采样结构和色度处理。

The phase of optical wave can be recovered by the intensity transport equation under the paraxial approximation For the optical system with diffraction limit, it is difficult to get the boundary radical slope of phase and sample in the circular domain boundary when using the intensity transport equation to recover the phase, consequently, we reviewed an algorithm mentioned in the reference ［4］, namely, the equation, computation domain and boundary condition are changed, then the phase is reconstructed by the multigrid method and corrected at last Moreover, the experiment system is set to testify the algorithm, and the recovered phase from the intensity data detected by CCD is compared with the result from phase retrieval algorithm, it is found that the phase reconstruction error can reach 017 λ in the case of non-uniform intensity distribution, as a result, the method is suitable for the phase recovery with low wavefront sensing accuracy.

在傍轴近似条件下，可以利用光强传播方程对畸变波前进行相位恢复。对于衍射受限的光学系统，很难获得相位的边界径向斜率值作为边界条件，此外，要获得精确的圆域边界采样值也并非易事。为了克服上述困难，进一步研究了相位恢复改进方法，即改变了方程的表示形式、计算区域和边界条件，并用多重网格法进行求解获得重构相位，最后再将其修正。为了验证算法的精确性，搭建了实验系统对算法进行实验验证，将由CCD探测的光强分布进行计算得到的相位分布与相位恢复算法的结果进行比较，证明在光强分布非均匀的情况下，该方法恢复的相位均方根误差能够达到017 λ，可以适用于波前传感精度要求不是很高的相位恢复。标签自适应光学相位恢复相位修正光强传播方程 adaptive optics phase retrieval phase correction intensity transport equation

Compared with the FFT-based computation to CAF, the presented method can scan the target only in certain circular sector instead of the whole ambiguity plane, which may decrease the computational load.

与基于FFT计算互模糊函数的方法相比，采用这种方法的优点是在检测目标时可以只扫描某个环形扇区而不用计算整个模糊平面，减小了计算量；另外，由于在计算互模糊函数时极角和极径的取样间隔可以任意选择，突破了时域采样间隔的限制，可在时延和频移上均得到高精度估计。

In the scheme, we use a path time delay estimation method to improve the accuracy of the correla- tion based symbol synchronization methods, and use a tracking loop to lock the symbol synchronization and to track the sampling clock.

在该算法中，我们使用一种路径时延估计的方法来提高基于相关算法码元同步的准确性，并采用一个跟踪环路来锁定码元同步和跟踪采样时钟。

The standard deviation of the delay between the hold command (input clock switched from hold to track state) and the instant at which the analog input is sampled, excluding clock source jitter.

该命令之间的延迟举行标准差（输入时钟由持有跟踪状态切换），以及在该模拟输入进行采样瞬间，不包括时钟源抖动。

AVO analysis is suggested for solving to solve the difficulty in identification of thin alternating layers in exploration of oilfields. It can improve the current method that has no thickness variable in the formula of reflective and is limited by sampling rates in calculation of the coefficient in the time of domain. Using the relationship of stress and displacement on two interfaces, this paper derives the spectrum of reflective coefficient for any incidence angle and thiekness of thim layer based on the equation of seismic wave propagation in the frequency domain.

针对油气田开发中薄互层认识难的问题，提出从AVO分析解决困难，克服现有方法在反射系数公式中无厚度变量、时间域计算反射系数谱受采样率限制的不足，运用两个界面间位移与应力关系，从频率域地震波传播方程推导了任意入射角和薄层厚度下的反射系数谱。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。