In image pre-processing, it introduces two steps of image pre-processing that is image distortion rectification and image noise restraint.
在图像预处理中，介绍了图像预处理中的两个步骤，即图像的几何校正和噪声点的抑制。
It can be seen from model experiment that the Total Harmonic Distortion (THD) of the current in the three-phase rectification circuit can be reduced from 30% to about 10%.
通过模拟试验证明，三相整流电路交流侧电流中的谐波含量由原来约30%下降到约10%。
The form of distortion of work piece was studied, and the software rectification method of three coordinates measurement data was put forward accordingly.
研究了工件的变形形式，并依此提出三坐标测量数据的软件矫正法。
But the distortion of SAR image brought by elevation is very difficult to be corrected by polynomial rectification.
但是，因高差引起的变形很难通过一般的多项式纠正方法进行改正。
This paper proposes an algorithm of iris automated identification and a method for rectification of geometric distortion of iris image. The matching result is measured by the relative coefficient.
提出了虹膜自动身份识别的算法及虹膜图像几何畸变的校正方法，最后用相关系数来测度图像的匹配结果。
The geometric rectification of satellite SAR image becomes more and more important in order to avoid geometric distortion and locate the image accurately.
而对星载SAR图像进行几何校正处理，消除图像中的各种几何变形，从而实现精确定位也越来越重要。
The form of distortion of work piece was studied, and the software rectification method of three coordinates measurement data was pot forward accordingly.
研究了工件的变形形式，并依此提出三坐标测量数据的软件矫正法。
The paper adopted cubic multinomial rectification technology which not only can correct optical lens's distortion but also has good rectification results for perspective and incline distortion.
文中采用了三次多项式校正技术，该技术不仅可校正光学镜头的几何畸变，对透视和倾斜所产生的畸变都有较好的校正效果。
A special configuration reducing stress distortion and a method for integral coupling of multi-lenses connecting in the processing of optical assembly and rectification are given in detail.
详细介绍了一种减小应力变形的特殊结构和在一种光学装校过程中多镜组整体对接的方法，给出了对接前后的偏心测量数据以及镜头实际曝光的图形。
A special configuration reducing stress distortion and a method for integral coupling of multi-lenses connecting in the processing of optical assembly and rectification are given in detail.
详细介绍了一种减小应力变形的特殊结构和在一种光学装校过程中多镜组整体对接的方法，给出了对接前后的偏心测量数据以及镜头实际曝光的图形。
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