Self-similarity matrices have become an important tool for visualizing the repetitive structure of a music recording. Transforming an audio data stream into a feature sequence, one obtains a self-similarity matrix by pairwise comparing all features of the sequence with respect to a local cost measure. The basic idea is that similar audio segments are revealed as paths of low cost along diagonal...

The term stochastic resonance was originally introduced to describe the mechanism of a constructive action of a white Gaussian noise in the transmission of a sinusoid by a nonlinear dynamic system governed by a double-well potential. Since then, the phenomenon of stochastic resonance has experienced large varieties of extensions with variations concerning the type of noise, the type of informat...

A video-rate color inverse-dithering system based on edge-sensitive low-pass filtering is introduced. The twin requirements of low complexity and low memory necessitate tradeoffs in system design, especially in the extent of the processing window. Our investigation shows that a single-line window is sufficient for achieving good results. We also investigate whether the separate color channels (...

Motivated by a recent halftoning method which is based on electrostatic principles, we analyse a halftoning framework where one minimizes a functional consisting of the difference of two convex functions (DC). One of them describes attracting forces caused by the image gray values, the other one enforces repulsion between points. In one dimension, the minimizers of our functional can be compute...

Dithering an image decreases the pixel bit depth and reduces the storage space required in the image buffer while largely preserving the perceptual quality. In some applications, it is desirable to reconstruct the original image; that is, restore the dithered image to its original bit-depth, for further processing or display. In this paper, we present a new color inverse dithering system design...

Dither-based methods for the halftoning of images on multi-level printing devices such as multi-level inkjet printers are presented. Due to the relatively large size of single droplets, halftoning algorithms are still needed. However, since halftoning occurs between the basic levels attainable by printing one, two or several droplets at the same position, artefacts are less visible than in equa...

halftoning, dithering A simple model for quantifying dither screen performance is proposed. Using this model, inherent limitations on the performance of dither screen halftoning are proved. An efficient method for generating quality dither screens, with good performance under our model, is presented.

We present a novel way of “dithering” the operation of an iterated hash function, based on the notion of square-free sequences (sequences containing no consecutive repeated subsequences) and on their generalization to abelian square-free sequences, as a means of defeating some “message expansion” attacks recently proposed by Dean and of Kelsey and Schneier [Dea99,KS05].