A system for reducing the substantially vertical extent of a wide-area biometric system and for reducing the cost and complexity of installation while maintaining high biometric performance, using a substantially horizontally configuration of cameras, preferably with an attention mechanism, and using a precision calibration system that can be used by an unskilled technician and that does not require an accurate site survey or additional materials or equipment.

A light field image capturing apparatus includes: a main lens, configured to transmit light of an object environment, and including an optical axis; a beam generation unit, configured to receive the light transmitted by the main lens and generate plurality Bessel-beams, where the beam generation unit includes plurality slits or conical lenses arranged in an array manner and configured to generate the Bessel-beam respectively; a micro-lens unit, configured to receive the Bessel-beam generated by the beam generation unit, and including plurality micro-lens elements corresponding to the beam generation unit, wherein each micro-lens element is configured to determine a focus point generated after the Bessel-beam passes through each micro-lens element, and a focal length of a distance between the focus point and the micro-lens element; and a light sensing unit, including a focal plane, and configured to enable the focus point to be focused on the focal plane.