Fig. 4 | Nature Communications

Fig. 4

From: Machine-learning reprogrammable metasurface imager

Fig. 4

Classifying body gestures with the proposed imager. a Classification rate versus number of measurements when the programmable metasurface is trained by random projection and PCA. For comparison, the corresponding results by theoretical PCA (blue line) are also provided. b–d The comparison of specific classification results by (b) random projection, (c) PCA, and (d) theoretical PCA, in which 25 measurements are used

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