The depth resolution of the Optical Coherence Tomography (OCT) system is dependent on the coherence length
and the lateral resolution depends on the beam waist on the sample. In OCT, optical axial resolution can thus be
increased by selecting a broad band source. High NA lenses provide smaller spot size than low NA lens at the expense of
short depth of focus that often does not stretch along. This is a trade-off between lateral resolution and depth of focus. In
this paper, a new kind of polarization pupil mask, which consists of a three-portion half-wave plate between two parallel
quarter-wave plates, is introduced into the Optical Coherence Tomography (OCT) systems, has the ability to realize the
lateral superresolution and extend the focal depth in a small range when used as an apodizer in the optical imaging
system. The simulation results show that high focal depth which is two times of the original optical system and the
lateral superresolution can be realized at the same time.
A efficient method for infrared face recognition by modified blood perfusion model of human face and
2DLDA in DWT domain is proposed. Then we demonstrate from the theoretical that the 2DLDA
subspace projection result remains the same with the original data are transformed using the wavelet
transformation. The experiments conducted illustrate that the method proposed in this paper has better
performance. While the recognition rate wasn't decrease based on modified blood perfusion model
compared to blood perfusion model obviously and have even lightly improved in some cases.
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