1. A method for capturing a vital vascular fingerprint image comprising: performing non-contact in-vivo imaging of a human fingertip to collect two dimensional vascular image data of the human fingertip using inter-frame intensity-based Doppler variance (IBDV) optical coherence tomography (OCT); generating a plurality of vascular tomographic images from the two dimensional vascular image data; constructing a three dimensional vascular image of the human fingertip from the plurality of two dimensional vascular tomographic images; and extracting at least one vital vascular fingerprint image of the human fingertip from the three dimensional vascular image.