This paper presents the results of three psychophysical experiments designed to investigate the effects of spatial correlations and the disruption of global precedence on the visual fidelity of natural images. The first two experiments used a psychophysical scaling paradigm in which subjects placed distorted images along a linear, one-dimensional “distortion axis” where physical distance corres...

Grayscale digital image halftoning quantizes each pixel to one bit. In error diffusion halftoning, the quantization error at each pixel is filtered and fed back to the input in order to diffuse the quantization error among the neighboring grayscale pixels. Error diffusion introduces nonlinear distortion (directional artifacts), linear distortion (sharpening), and additive noise. Threshold modul...

Several input-output gains of linear periodic systems are deened, in particular, G(` 2 ; ` 2)| the worst-casè 2 norm of the output over all inputs of unit`2 norm|and G(RMS; RMS)|the worst-case RMS value of the output over all inputs of unit RMS value. It is proved for linear periodically time-varying (LPTV) systems that these two gains are equal, a known fact for LTI systems. In addition, the r...

This paper describes the computations of micro-strains at inner corner of cold formed rectangular hollow sections (CFRHS) made up of structural steels using finite element analysis. In order to obtain the micro-strains, distortion test is simulated by modeling two-dimensional structural steel tubes in ANSYS software. Two dimensional linear static analyses are performed by defining elastic prope...

In order to evaluate the effect of dropping parts of coefficients in H.264 bit-stream, the distortion aroused by coefficient dropping has to be estimated accurately. In this paper, an efficient method is presented to estimate the distortion of a frame during the error propagation caused by single frame coefficient dropping of H.264 bit-stream. At first, through analyzing the image reconstructio...

Harmonic distortion has garnered a lot of interest in the recent past due to the high advent of the non-linear electronic loads. Moreover, newer technologies including distributed generation and electric vehicles are anticipated to be part of the distribution systems at a mass scale in the near future. This makes it of utmost importance to evaluate the existing power distribution systems and an...

In the past few years problems like harmonic pollution or waveform distortion became more important as the load nature changed. The typical linear loads have been progressively replaced by non-linear ones, where rectifier systems have a great importance. A wide variety of industrial applications such as variable speed drives and most of power electronics’ converters use uncontrolled rectifiers ...

The theoretical guarantees provided by voting have distinguished it as a prominent method of preference aggregation among autonomous agents. However, unlike humans, agents usually assign each candidate an exact utility, whereas an election is resolved based solely on each voter’s linear ordering of candidates. In essence, the agents’ cardinal (utility-based) preferences are embedded into the sp...

Linear methods form the basis of current high-performance image and video coders. In image coding, energy-compacting linear transforms are utilized to decorrelate and sparsify the source. In the coding of video sequences, a simple linear predictive loop is used to reduce the important temporal dependencies. This dissertation presents a body of work concerned with the analysis and optimization o...

A time-domain digital simulation of an in-the-ear (ITE) hearing aid has been developed. The stimulation allows modeling of nonlinear effects such as compression and amplifier distortion in addition to linear processing and acoustics. The simulation includes a microphone, two-channel compression processing, an amplifier with clipping distortion, a receiver, an ear canal and ear drum, and feedbac...