As gate dielectrics are scaled to a few atomic layers and the channel doping is increased to mitigate short channel effects, high vertical electric fields cause considerable mobility degradation through surface roughness scattering in silicon MOSFETs. This high field mobility degradation is known to influence the harmonic distortion through higher order drain current derivatives. Failure to tak...

This paper describes a fast method of correcting for optical distortion in head-mounted displays (HMDs). Since the distorted display surface in an HMD is not rectilinear, the shape and location of the graphics window used with the display must be chosen carefully, and some corrections made to the predistortion model. A distortion correction might be performed with optics that reverse the distor...

EPIs (I-IIa), corresponding FA maps without (I-IIb), with eddy-correction (I-IIc and I-IId) and the final FA maps with comprehensive distortion correction (III): For comparison, eddy correction was performed with the proposed calibration method (c) and FSL (d) and the results were compared with an reference image without distortion (IIIa). To verify the correction quality more easily, the enlar...

Applications of X-ray image intensifiers in medical imaging, include the use of fluoroscopic projection images to generate three-dimensional tomographic reconstructions. Unfortunately, the inherent distortions on the acquired projections deteriorate the quality of the reconstructed tomograms. Distortion correction can be performed using algorithms that can be classified as global or local accor...

We present a new framework for correcting multiperspective distortions using collineations. A collineation describes the transformation between the images of a camera due to changes in sampling and image plane selection. We show that image distortions in many previous models of cameras can be effectively reduced via proper collineations. To correct distortions in a specific multiperspective cam...

We present a theoretical and experimental analysis of nonlinear microwave photonic filters. Far from the conventional condition of low modulation index commonly used to neglect high-order terms, we have analyzed the harmonic distortion involved in microwave photonic structures with periodic and non-periodic frequency responses. We show that it is possible to design microwave photonic filters wi...

Echo-planar images acquired in nonaxial planes are often distorted. Such image distortion has limited the applications of the echo-planar imaging (EPI) technique. In this article, it is demonstrated that a considerable amount of the distortion is caused by the higher-order magnetic field concomitant with the linear magnetic field gradient, or the concomitant magnetic field. The image distortion...

We examine the use of two integrated-optical modulators operated in parallel to attain low-distortion analog optical transmission. This static feedforward approach achieves significantly improved linearity at the expense of small increases in the required optical power and moderate increases in the required drive voltage. A novel variation that uses the unique characteristics of an integrated-o...