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. 2022 Mar 23;12:4971. doi: 10.1038/s41598-022-09047-6

Figure 4.

Figure 4

Illustration of data processing using 3D-PCA. Each point (i,j) throughout the depth in the 3D images is transformed into a temporary 2D structure. A regular PCA decomposition is applied to transformed images of the millimeter-wave image data set. After the number of PCs is selected, the scores and loadings are combined for all points (i,j) and separated for each PC.