将Java中构建的3D仿射变换导入R
将Java中构建的3D仿射变换导入R
提问于 2018-10-15 02:53:59
我有一个关于仿射变换的问题(在<affine>标签之间)。我从一个xml文件(full xml file here)中提取以下两个仿射转换，该文件是用BigDataViewer创建的斐济插件创建的，使用AffineTransform3D函数：
<ViewRegistrations>
<ViewRegistration timepoint="0" setup="0">
<ViewTransform type="affine">
<Name>Fast 3d geometric hashing (rotation invariant), AffineModel3D on [beads (c=0)]</Name>
<affine>1.0 0.0 0.0 0.0 0.0 1.0 0.0 0.0 0.0 0.0 1.0 0.0</affine>
</ViewTransform>
<ViewTransform type="affine">
<Name>calibration</Name>
<affine>1.9998662296836334 0.0 0.0 0.0 0.0 1.9998662296836334 0.0 0.0 0.0 0.0 1.9998662296836334 0.0</affine>
</ViewTransform>
</ViewRegistration>我想使用R包{RNiftyReg}中的buildAffine()函数导入R中的两个仿射变换，然后使用{RNiftyReg}中的composeTransforms()计算它们的合成。
buildAffine(translation = c(0, 0, 0), scales = c(1, 1, 1), skews = c(0, 0,0),
angles = c(0, 0, 0), source = NULL, target = NULL,
anchor = c("none", "origin", "centre", "center"))我的问题是：
上面的仿射变换存储在12个索引的向量中。buildAffine()要求将平移、比例、倾斜和角度的值作为输入参数。
我想知道哪个值对应于什么。
回答 1
Stack Overflow用户
回答已采纳
发布于 2018-10-15 07:11:12
我主要是一个R用户，但是这里是这样的: Java调用中变量的名称是：
dat <- scan (text="double xx, double yx, double zx, double tx, double xy, double yy, double zy, double ty, double xz, double yz, double zz, double tz", what="")
dat <- dat[dat != "double"]
matrix(dat,4)
[,1] [,2] [,3]
[1,] "xx," "xy," "xz,"
[2,] "yx," "yy," "yz,"
[3,] "zx," "zy," "zz,"
[4,] "tx," "ty," "tz" 本页介绍了如何对仿射变换进行编码，唯一的区别是4x3矩阵是转置的：https://o7planning.org/en/11157/javafx-transformations-tutorial
t( matrix(dat,4) )
[,1] [,2] [,3] [,4]
[1,] "xx," "yx," "zx," "tx,"
[2,] "xy," "yy," "zy," "ty,"
[3,] "xz," "yz," "zz," "tz" 因此，将矩阵应用于c(x，y，z,1)的向量，得到的输出为：
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原文链接：
https://stackoverflow.com/questions/52806023
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