1) Windowed back projection
加窗反投影
2) projecting machining
投影加工
1.
Based on the analysis on the error of projecting machining for complex surface of 3-axis,the machining errors will be greatly affected by curvature of the surface, and deficient cut happens if the interval is greatly lengthened.
本文分析了数控三坐标曲面加工行距计算公式,得出了曲面数控投影加工行距与曲率半径的关系。
2.
Based on the analysis on the errors of projecting machining for complex surface of 3-axis, the machining errors will be greatly affected by the angle(α) formed by the line of two cutter locations as well as the surface on which tool-path exists.
两刀位点间连线与原有刀具轨迹所在平面的夹角α(或曲面上刀位数据的Z坐标增量Δz)对基于CAD/CAM的复杂曲面数控三坐标投影加工误差十分敏感。
3) additive color projection
加色投影
4) projective weighted
投影加权
1.
In this algorithm, the optimal motion vectors of lost blocks are estimated by projective weighted method using correspondingly positional motion vectors of neighboring frames and neighboring blocks.
264时域误码掩盖算法中丢失块的相邻运动矢量在无线环境下极易丢失的问题,结合部分误码掩盖算法研究成果,提出了一种利用相邻参考帧和丢失块相邻运动矢量,运用投影加权的方法估计出最优丢失块运动矢量用于误码补偿的改进误码掩盖算法。
5) back-projection
['bækprə,dʒekʃən]
反投影
1.
An improved back-projection algorithm for electrical impedance tomography
改进的电阻抗反投影成像算法
2.
In this thesis projection-address computation of reconstruction of 3D-cone beam CT has been studied, the reuse regularity of projection-address and back-projection weight has been found , a method of " 3D-cone beam CT fast reconstructioncomputation using cylinder coordination address mapping back-projection" has been realized, and the related data struct has been constructed.
本文对锥束3D-CT反投影过程的计算进行了深入研究。
6) back projection
反投影
1.
The forward problem is solved by finite element method and the method of simple back projection is adopted to reconstruct the image.
本文给出了二维计算机模拟头模型；采用有限元方法进行正问题的求解，用简单反投影算法进行了图象的重建，成像结果与实际模型相近。
2.
In review of the "pseudo-lines" in direct projection image reconstructions, a new image reconstruction algorithm is proposed in the paper purporting to solve problems of ray back projections.
针对直接反投影重建的伪迹现象,提出了一种新型射线反投影重建算法,该方法基于反投影数据的“求交”运算,不同于常规反投影相叠加方法,可以较好地克服图像部分伪迹,仿真结果证明了该方法的有效性。
3.
It describes the finite element model of electrical capacitance tomography system for two phase flows and the numerical simulation method based on back projection algorithm.
描述了两相流成象电容层析系统的有限元模型和利用反投影法进行数值模拟的方法，对典型的层流状模型重建出流体成分分布图象。
补充资料：滤波反投影或卷积反投影
滤波反投影或卷积反投影
影像学术语。当代影像学设备进行影像重建的数学方法。在直接用扫描后所获得的投影轨迹剖面图反投影重建出的CT图像中，无法避免角度卷入条纹伪影(angular aliasing streaks)造成的模糊和失真。这种现象与被扫描层面的空间频率中高频信息的损失有关。使用一种精密的数学方法去除这种模糊。称为“展现”(unfolding)或去卷积(deconvolution)，即在反投影前使用一种数学的“滤器”或卷积函数对原始数据进行修正，然后再进行反投影。两步数学处理过程合称为滤波(修正后)反投影或卷积(后)反投影。这种方法的优点是处理过程简单，速度快，所得图像逼真、清晰。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条