An Automatic Two-Hand 2D:4D Finger-Ratio Measurement Algorithm for Flatbed Scanned Images

There is a vast body of research based on 2D:4D finger ratio measurements within the fields of medicine, physiology, and several other disciplines. There are well-known conventions for how such finger measures should be conducted, and all such measurements are to this date manual. Manual measurements are time consuming and prone to human error, different practices and subjective influences. This study proposes a novel algorithm for automatically computing the 2D:4D finger ratios using images of hand pairs. The algorithm is simple to implement and robust to image noise. Initial experimental assessments indicate that the algorithm successfully manages to accurately determine 2D:4D finger ratios. The proposed algorithm could help improve the research fields that make use of digit ratio measurements. Areas of algorithm improvements are also identified.