为提高其重建速度，提出了一种利用对称性并结合递归技术的方法来减少该算法的反投影运算量。
To improve its reconstruction speed, a method combining symmetry with recursion technique to reduce backprojection calculation is presented.
与已有的加权迭代特征算法比较，该算法避免了所有点参与计算相机的投影矩阵，运算速度更快。
Compared to previous methods, this algorithm does not involve the problem of computing projection matrix of camera with all the points and its computing speed is faster.
给出了序列的矩与投影度的概念和数学描述，并着重研究了其运算性质。
The concepts and mathematic descriptions of moment and projection for general discrete sequence are also proposed. Their operation rules are studied in details.
使关系元组在由外存至主机的流动过程中就并行完成筛选、投影关系代数的一元运算。
When relational tuples are flowing from mass storage to host via this filter, the unary operations of relational algebra for them such as projection and selection are completed parallelly.
本文运用了约束关系式、投影和矩阵运算等方法对空间RSCR、RRSRR、RRRSR、RERRR和RRERR等机构的位移进行分析。
The author applies constraint relations, projective method and matrix operations to the displacement analyses of spatial RSCR, RRSRR, RRRSR, RERRR, and RRERR mechanisms.
另外新算法结合了变换图目标区域的轴向投影统计策略，保证了匹配运算量的降低；
Collecting the distance axis projection, this algorithm not only work well when the target has the scale change or rotation, but also has the low operation cost.
该方法直接进行图像矩阵投影，避免高维运算。
The image matrix was directly projected to avoid high dimension operation.
正交投影（OP）自适应波束形成算法性能优良，但需要进行复协方差矩阵特征分解，运算量大。
The orthogonal projection (OP) adaptive beamforming algorithm has good performance but it is computationally expensive because of performing eigen-decomposition of the complex covariance matrix.
通过这些处理将运动估计过程中复杂的二维图像运算转化为一维投影信号进行处理，有效的降低了计算负荷。
Those processing translate the 2D image calculation of motion estimation into 1D signal computation to reduce the computational complexity of motion estimation.
理论分析表明：近场三维距离偏移算法与后向投影算法相比，能在较大程度上减少运算量。
Theoretical analysis shows that near field 3-d range migration imaging technique can reduce computational complexity in much degree by contrast with back propagation algorithm.
理论分析表明：近场三维距离偏移算法与后向投影算法相比，能在较大程度上减少运算量。
Theoretical analysis shows that near field 3-d range migration imaging technique can reduce computational complexity in much degree by contrast with back propagation algorithm.
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