Due to the proliferation of low-cost color printers during the last few years, converting full-color images to halftoned bi-level separations remains an important issue. A halftoning technique should faithfully reproduce the original color image, while satisfying several quality criteria such as absence of visible artifacts and Moires, providing reliable color reproduction as well as good small...

Error diffusion dithering is a technique that is used to represent a grayscale image on a printer, a computer monitor or other bi-level displays. For a number of years it was believed that error diffusion algorithms can not be parallelized. On this paper we present a simple error-diffusion parallel algorithm that can be easily implemented on parallel computers that contain linear arrays of proc...

The accuracy in the photometry of a point source depends on the point-spread function (PSF), detector pixelization, and observing strategy. The PSF and pixel response describe the spatial blurring of the source, the pixel scale describes the spatial sampling of a single exposure, and the observing strategy determines the set of dithered exposures with pointing offsets from which the source flux...

In this paper, a method for compensating the softening effect of the error diffusion algorithms, and a new dithering technique that emphasizes the details of images and is based entirely on the wavelet transform, are presented.

Dithering is the process of intentionally adding artificially generated noise to an otherwise uncorrupted signal to actually improve the performance of an end overall system. This article demonstrates that a dithering procedure can be used to improve the performance of an EEG interictal spike detection algorithm. Using a previously reported algorithm, by adding varying amounts of artificially g...

Digital halftoning remains an active area of research with a plethora of new and enhanced methods. While several fine overviews exist, this purpose of this paper is to review retrospectively the basic classes of techniques. Halftoning algorithms are presented by the nature of the appearance of resulting patterns, including white noise, recursive tessellation, the classical screen, and blue nois...

We introduce a new global approach for image dithering, stippling, screening, and sampling. It is inspired by the physical principles of electrostatics. Repelling forces between equally charged particles create a homogeneous distribution in flat areas, while attracting forces from the image brightness values ensure a high approximation quality. Our model is transparent and uses only two intuiti...

One of the interesting problems of digital image processing is how much the color table can be reduced without any detectable difference in the quality of an image. The process of reducing the color information is known as quantizing. Often visible artifacts, such as false contours, appear in a quantized image. Digital halftoning or spatial dithering is a process which tries to reduce the visib...

Deep metrics have been shown effective as similarity measures in multi-modal image registration; however, the metrics are currently constructed from aligned image pairs in the training data. In this paper, we propose a strategy for learning such metrics from roughly aligned training data. Symmetrizing the data corrects bias in the metric that results from misalignment in the data (at the expens...

The MultiDrizzle software provides a flexible, unified interface to the various steps involved in registering, cleaning and combining dithered HST data. MultiDrizzle can be run on ACS, WFPC2, NICMOS and STIS imaging data in a single step, with default parameters chosen to provide good results for the majority of datasets if standard recommended dithering patterns were followed. Alternatively, t...