We pres ent a new "knowledge-based nonuniform crossover" opera tor for genet ic algorit hms that generalizes uniform crossover. We ext end this to "Dynamic knowledge-based nonuniform crossover ," which const antly updates the knowledge ext racted t hus far from the environment 's feedb ack on previously generated chromosomes. Knowledge-based nonu niform crossover can improve on good solutions p...

The fundamental knowledge container in case-based reasoning is the case base of prior experiences. An important focus of recent CBR research is on maintenance strategies for achieving compact, competent case bases, as a way to improve the performance of CBR systems. However, the actual tradeoos between competence, compactness, and performance may be complex. Consequently, this paper argues for ...

This chapter generalizes compressed sensing (CS) to reduced-rate sampling of analog signals. It introduces Xampling, a unified framework for low rate sampling and processing of signals lying in a union of subspaces. Xampling consists of two main blocks: Analog compression that narrows down the input bandwidth prior to sampling with commercial devices followed by a nonlinear algorithm that detec...

An innovative technique for the enhancement of digital color images captured under extremely nonuniform lighting conditions is proposed in this paper. The key contributions of this technique are adaptive intensity enhancement, contrast enhancement and color restoration. Simultaneous enhancement of extreme dark and bright intensity regions in an image is performed by a specifically designed Loca...

With the advent of wavelets for lossy data compression came the notion of representing signals in a certain vector space by their projections in well chosen subspaces of the original space. In this paper, we consider the subspace of signals generated by an overdecimated rational nonuniform filter bank and find the optimal conditions under which the mean-squared error between a given determinist...

Current audio compression schemes are capable of reducing the per channel bit rate of high quality audio signals from 16 bits per sample to around 2-4 bits per sample. In these schemes, knowledge of psychoacoustics is utilised and a uniform or nonuniform frequency decomposition method is used. In this paper we derive the optimum bit allocation to achieve the highest perceptual quality under a f...

A nonuniform multi-Gabor expansion (MGE) scheme is studied under proportional time and fi'equency (TF) shifts among different window indices m. In particular, TF parameters for each m are different, but proportional and relevant to windows' TF patterns. The generation of synthesis waveforms for nonuniform MGE is generally difficult. 'Ne show constructively that there is a set of basic synthesis...