Noncontact Palm Vein ROI Extraction Based on Improved Lightweight HRnet in Complex Backgrounds

<div>Comparison of ROI extraction effects in complex background. (a) Effect of traditional method of extraction: (a1) original image, (a2) binarization, (a3) valley point positioning, and (a4) ROI extraction. (b) Improved HRnet algorithm extraction effect: (b1) original image, (b2) keypoint positioning, and (b3) ROI extraction.</div>

IET Biometrics

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Figure 14

Figure 14: Noncontact Palm Vein ROI Extraction Based on Improved Lightweight HRnet in Complex Backgrounds 