RATIONALE AND OBJECTIVE The set partitioning in hierarchical trees (SPIHT) wavelet image compression algorithm with the human visual system (HVS) quantization matrix was investigated using x-ray coronary angiograms. We tested whether the HVS quantization matrix for the SPIHT wavelet compression improved computer model/human observer performance in a detection task with variable signals compared...

Brushless Direct Current (BLDC) motors are widely used for high performance control applications. Conventional PID controller only provides satisfactory performance for set-point regulation. In this paper, a discrete time optimal tracking control of BLDC motor is presented. Modeling of the BLDC motor is expressed in state equation. A discrete time full-order state observer is designed to observ...

non-fragile observer design is the main problem of this paper. using continuous frequency distribution, the stability conditions based on integer order lyapunov theorem are derived for lipschitz class of nonlinear fractional order systems. the proposed observer is stable beside the existence of both gain perturbation and input disturbance. for the first time, in this paper a systematic method i...

this paper presents a new observer design methodology for a time varying actuator fault estimation. a new linear matrix inequality (lmi) design algorithm is developed to tackle the limitations (e.g. equality constraint and robustness problems) of the well known so called fast adaptive fault estimation observer (fafe). the fafe is capable of estimating a wide range of time-varying actuator fault...

We demonstrate that human-vision-model-based image quality metrics not only correlate strongly with subjective evaluations of image quality but also with human observer performance on visual recognition tasks. By varying amorphous silicon image system design parameters, the performance of human observers in target identification using the resulting test images was measured and compared with the...

We created a sequential ideal-observer model that could address the question, How much of letter identification performance and its change with eccentricity can be accounted for by preneural factors? The ideal-observer model takes into account preneural factors including the stimulus rendering properties of a CRT display, the optical imaging quality of the eye, and photon capture and sampling c...

Approximately 5% of the world’s population suffer from what is commonly called colour blindness. A small number of products are on the market that claim to improve colour discrimination for colour-blind observers. This study evaluates the performance of a particular product (Colour Correcting lenses) product by performing psychophysical experiments with a colour-blind observer. Without correcti...

This paper addresses the mixed H−/H∞ fault detection observer design issue for a class of linear parameter varying (LPV) system. Based on the quadraticH∞ performance and affine quadratic H∞ performance concepts, as well as the corresponding quadratic H− index performance and affine quadratic H− index performance for measuring the worst-case fault sensitivity of the underlying LPV system, the ex...

Approximately 5% of the world’s population suffer from what is commonly called colour blindness. A small number of products are on the market that claim to improve colour discrimination for colour-blind observers. This study evaluates the performance of a particular product (ColorView A5) product by performing psychophysical experiments with a colour-blind observer. Without correction the obser...

This paper presents an implementation of a switching observer design strategy to a piece-wise linear beam system comprising a flexible steel beam with a one-sided support. The switching observer design strategy guarantees asymptotic stability of the estimation error. Experimental and simulation results are presented to demonstrate the observer error stability and performance. Copyright c 2005 I...