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. Author manuscript; available in PMC: 2020 Jun 11.
Published in final edited form as: Proc SPIE Int Soc Opt Eng. 2019 Mar 8;10951:109512I. doi: 10.1117/12.2512282

Figure 2.

Figure 2.

(a) A schematic illustration of the selected points on a sample ray (Ri) used for feature extraction. (b) A sample cubic image patch (P) centered on the ray point (xp, yp, zp) and extraction of a vector of K = 67 texture features of the image patch.