Error Diffusion: Wavefront Traversal and Contrast Considerations

Adaptive Wavefront-Correction Algorithms Using Focal-Plane Array Intensity Measurements

Earth’s atmospheric turbulence induces aberrations in the wavefront of the optical signal from a distant spacecraft. These aberrations cause diffusion and spreading of the signal energy in the receiver’s focal plane, potentially resulting in an increase in bit-error rate (BER) by several orders of magnitude when significant background radiation is present, such as during daytime operation. The ...

Pointillist Halftoning

We explore an extension of current halftoning algorithms that aims to reproduce pointillism, a style of postimpressionist painting. Halftoning algorithms solve the problem of reproducing an image with many colors on a device with very few colors (usually only two, black and white). Pointillist painters also created images using a very limited number of paint colors. Both halftoning and pointill...

Visual acuity as a function of Zernike mode and level of root mean square error.

BACKGROUND The coefficients of normalized Zernike expansion are orthogonal and reflect the relative contribution of each mode to the total root mean square (RMS) wavefront error. The relationship between the level of RMS wavefront error within a mode and its effect on visual performance is unknown. PURPOSE To determine for various levels of RMS wavefront error how each mode of the normalized ...

analysis the diffusion process for polymer solution using FTIR-ART technique: special considerations

Uncorrected wavefront error and visual performance during RGP wear in keratoconus.

PURPOSE To examine the relationship between uncorrected residual wavefront error and visual performance (VP) in rigid gas permeable (RGP) contact lens-wearing keratoconic eyes. METHODS Seven eyes from six subjects (six moderate, one severe) were studied (mean +/- SD age: 42.71 +/- 11.38 years). Significant corneal scarring was an exclusion criterion. Measurements were taken with RGP lenses in...