lzd

This article gives the LZD matching technique in 3D free-form surface matching without control points based on Grid-DEM.

针对三维自由表面匹配问题，实现基于LZD算法进行无控制DEM匹配，克服了控制点布设的困难。

The research result shows that its matching accuracy is higher than that of the M-LZD ( LZD using M-estimator) and LMS-LZD ( LZD using least-median-of-squares estimator) algorithms.

结果表明，新方法的匹配精度比目前代表性的采用M-估计的LZD算法（M-LZD）和采用最小平方中位数的LZD算法（LMS-LZD）的精度高。

Through analyzing the algorithm principle and the transformation parameters relationship, the author puts forward slope-smoothing technique to strengthen and improve the pull-in range of LZD and the matching automatization degree.

通过分析匹配算法原理和转换参数相对关系，提出了增强LZD算法拉入范围的坡度平滑技术，改善了LZD算法的拉入范围，增强了匹配自动化程度；

Development of DoD Variable Displacement System in LZD Engines

LZD发动机DoD可变排量系统的开发

Comparison of LZD and ICP Algorithms in DEM Matching without Control Points

用于无控制DEM匹配的LZD和ICP算法的比较

To select an appropriate algorithm for DEM matching, this paper reviews the development of the two popular 3D surface matching algorithms, least z-difference ( LZD) and iterative closest point ( ICP), and describes their common logical framework.

为了选择一种更适合数字高程模型匹配的算法，首先回顾了目前广泛使用的两种3维表面匹配算法&最小高差算法和最近点迭代算法的发展，并给出了二者共同的逻辑框架；

Therefore, LZD is more appropriate for DEM matching with small pose different.

因此，对于表面姿态差异较小的DEM匹配而言，LZD算法更加适合。