Second, we used to find out the intersect lines of shell and nozzles by the means of projection transform.
二是以往通常用投影转换的方法来求得筒体和接管的相贯线，这种方法放样困难、繁复且精度不高。
In order to satisfy the different needs of submarine navigated performance in the different navigation steps, the fast terrain matching algorithm based on radial projection transform is presented.
根据多波束声纳地形匹配导航中不同阶段对匹配性能的不同要求，提出了基于径向投影变换的快速地形匹配方法。
As a result, with phase unwrapping technique based on Fourier transform, any cross section projection could conveniently be worked out from the Moiré deflectogram of rocket exhausted plumes.
结果发现，根据火箭喷焰的莫尔条纹，采用傅里叶变换相位展开技术，可以方便地提取任意截面的投影信息。
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