**6. Patents**

From the work reported in this paper, no patents have resulted nevertheless, two software algorithms have been registered: TGS-CVBR® and PIS-CVBR®.

**Supplementary Materials:** The following are available online at https://zenodo.org/record/3696767#.Xl-o6aj0na8, Video S1: UC3M-Wrist\_Vascular\_Biometric\_Recognition\_Using\_a\_Portable\_Contactless\_System.mp4.

**Author Contributions:** Conceptualization, R.S.-R. and R.G.-M.; methodology, R.S.-R. and R.G.-M.; software, R.G.-M.; validation, R.S.-R. and R.G.-M.; formal analysis, R.G.-M.; investigation, R.G.-M.; resources, R.S.-R. and R.G.-M.; data curation, R.G.-M.; writing—original draft preparation, R.G.-M.; writing—review and editing, R.S.-R. and R.G.-M.; visualization, R.G.-M.; supervision, R.S.-R.; project administration, R.S.-R.; funding acquisition, R.S.-R. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Conflicts of Interest:** The authors declare no conflict of interest.
