Feature extraction of a depth mapping by using a polarization-independent LC lens system

Abstract

The polarization-independent focal images are obtained by taking two images in lens state and one image in non-lens state of a liquid crystal (LC) lens. The two images in lens state are captured by switching the voltages applied to a twisted nematic (TN) LC cell attached in front of the LC lens. Three-dimensional and polarization-independent images of the sample target are obtained by tuning a focal plane of the LC lens and processing an image digital filter from sequential focal images.