This paper focuses on the estimation of the Tilt intonation model [1]. Usually, Tilt events are detected using a first estimation which is improved using gradient descent techniques. To speed up the search we propose to use a closed form expression for some of the Tilt parameters. The gradient descent search is used only for the time related parameters because a close expression cannot be found...

Altered gravity environments, such as those experienced by astronauts, impact spatial orientation perception, and can lead to spatial disorientation and sensorimotor impairment. To more fully understand and quantify the impact of altered gravity on orientation perception, several mathematical models have been proposed. The utricular shear, tangent, and the idiotropic vector models aim to predic...

PURPOSE To measure tilt and decentration of intraocular lenses (IOLs) with Scheimpflug and Purkinje imaging systems in physical model eyes with known amounts of tilt and decentration and patients. SETTING Instituto de Optica Daza de Valdés, Consejo Superior de Investigaciones Científicas, Madrid, Spain. METHODS Measurements of IOL tilt and decentration were obtained using a commercial Schei...

This paper proposes a method for recognizing human behaviors based on a combination of “overall motion analysis using Hidden Markov Model (HMM)” and “detailed feature analysis in a specific area by using an active (pan-tilt-zoom, PTZ) camera”. The PTZ parameters are controlled depending on the intermediate result of analyzing the target’s motions based on HMM. As a result, our system can distin...

Recent simulations have indicated that the traditional Helfrich-Canham model for topographical fluctuations in fluid phase biomembranes should be enriched to include molecular tilt. Experimental evidence supporting the aforementioned enrichment is reported. The current work is a tilt-dependent analysis of the X-ray scattering from oriented stacks of fluid phase lipid bilayers. By analyzing seve...

Purpose: To measure tilt and decentration of intraocular lenses (IOLs) with Scheimpflug and Purkinje imaging systems. Methods: Measurements of IOL tilt and decentration were obtained using a commercial Scheimpflug system (Pentacam, Oculus) and custom algorithms, and a custom-built Purkinje imaging apparatus. Both methods were validated with a physical model eye where tilt and decentration can b...

The control of upper body (UB) orientation relative to the pelvis in the frontal plane was characterized by analyzing responses to external perturbations consisting of continuous pelvis tilts (eyes open and eyes closed) and visual surround tilts (eyes open) at various amplitudes. Lateral sway of the lower body was prevented on all tests. UB sway was analyzed by calculating impulse-response func...

All linear accelerometers measure gravitoinertial force, which is the sum of gravitational force (tilt) and inertial force due to linear acceleration (translation). Neural strategies must exist to elicit tilt and translation responses from this ambiguous cue. To investigate these neural processes, we developed a model of human responses and simulated a number of motion paradigms used to investi...

The control of upper body (UB) orientation relative to the pelvis in the frontal plane was characterized by analyzing responses to external perturbations consisting of continuous pelvis tilts (eyes open [EO] and eyes closed [EC]) and visual surround tilts (EO) at various amplitudes. Lateral sway of the lower body was prevented on all tests. UB sway was analyzed by calculating impulse-response f...

purpose : the aim of this study was to investigate the effect of misalignment (tilt & decentration) of iols in cataract surgery using liu-brennan optical eye model in a simulation. methods : a phantom with the real eye parameters –liu-brennan model– and tecnis z9000 iol were used for simulation. results : results showed that with 0.4 mm decentration and more the modulation transfer function (mt...