During embryonic development the lens receives nourishment from the posterior and anterior tunica vasculosa lentis. During the fourth month of gestation, macrophages play a role in the regression of the tunica vasculosa lentis, revealing the pupillary aperture posteriorly. The persistent pupillary membrane (PPM) represents a congenital remnant of the anterior tunica vasculosa lentis. As in this...

This paper proposes a technique for using infrared (IR) imagery to eliminate false forward-looking ground penetrating radar (FLGPR) detections by examining areas in IR images corresponding to FLGPR alarm locations. The FLGPR and IR co-location is based on the assumption of a flat earth and the pinhole camera model. The parameters of the camera and its location on the vehicle are not assumed to ...

In this section we derive the algebraic equations commonly used in the computer graphics technique of raytracing, where the simulation of geometric propagation of rays in an illuminated scene is used to produce highly realistic renderings of three-dimensional virtual scenes. Somewhat counter-intuitively, but for reasons of efficiency, in practical raytracer implementations, ray trajectories ori...

Most algorithms in 3-D Computer Vision rely on the pinhole camera model because of its simplicity, whereas video optics, especially low-cost wide-angle lens, generate a lot of non-linear distortion which can be critical. To nd the distortion parameters of a camera, we use the following fundamental property: a camera follows the pinhole model if and only if the projection of every line in space ...

Monochromator-induced glitches m the extended X-ray absorption fine structure (EXAFS) are studied using a pinhole sample . We have collected more detailed beam-profile data that enabled us to do a better simulation of the glitch shape. Applying the model we developed earlier, we obtain excellent agreement between the simulation and the experimental pinhole glitch . We point out that the EXAFS g...

Abstract The surface evolution model based on geometric partial differential equation is used to numerically study the kinetics of dewetting and dynamic morphologies for the localized pinhole defect in the surface of the ultrathin solid film with the strongly anisotropic surface energy. Depending on parameters such as the initial depth and width of the pinole, the strength of the attractive sub...

The issue of channel estimation is investigated for the UHF MIMO-RFID systems over pinhole channel. A training sequences aided linear minimum mean square error (LMMSE) channel estimation is proposed for the whole pinhole channel at the reader. Based on the mean square error (MSE) criterion, the MSE bound and the optimal training scheme with this bound are derived. By exploiting the optimal trai...

Neutron imaging is currently being developed as a primary diagnostic for inertial fusion studies at the National Ignition Facility (NIF). It is an attractive diagnostic for measuring asymmetries in the burn region and will be able to operate at neutron fluences found during ignition scale implosions. The most straightforward technique for imaging of the spatial distribution of deuterium-tritium...