Krisztián Samu

Budapest University of Technology and Economics · Department of Mechatronics, Optics and Information Engineering

Body movements during perceptual tasks can be considered as exploratory activity that facilitate perception. In the present study we tested whether the complexity of postural sway is related to perception of affordances. Effort-to-compress (ETC), a novel measure of complexity, was shown to be related to perception as compared to gross measures of b...

The contrast sensitivity of normal and anomalous trichromats were examined with Landolt-C figures by eye-tracking system. For the measurements, two series of test images (achromatic and colored) were designed. The difficulty levels of the tests were gradually increased after each right answer. In the case of the observation of the ring of the Lando...

Visual perception of whether an object is within reach while standing in different postures was investigated. Participants viewed a three-dimensional (3D) virtual reality (VR) environment with a stimulus object (red ball) placed at different egocentric distances. Participants reported whether the object was reachable while in a standard pose as wel...

Accurate rotational speed determination for rotary machines tends to be allocated high priority in technical applications. In some cases, it is not easy to measure shaft speed directly. Vibration diagnostic tools can offer an alternative solution to the problem posed by direct rotational speed measurement. Using calculated spectra and cepstra can h...

Accurate event detection has high priority in many technical applications. Events in acquired data series, their duration, and statistical parameters provide useful information about the observed system and about its current state. This information can be used for condition monitoring, state identification, and many kinds of forecasting as well. In...

The goal of this project was to implement a device, which can measure the illuminance and the correlated color temperature (CCT) of a light source and also works as a webserver. The analyzation of light sources is very important in our everyday life. With the use of a webserver the measured values are easily accessible and the calculation methods c...

Accurate estimation of rotational speed of rotary machines has usually high priority in technical applications. This information should be calculated for many diagnostic algorithms, control or regulation processes. Incorrectly estimated values could occur serious disturbances in the operation of machines. Additional instrumentation often may be obs...

For the rapid development observable in solid state lighting technology, both in favor of the better lighting performance achievable and the advantage in upkeep, changing the conventional installations to LED luminaires is often considerable in the modern roadway lighting practice. By these modernization investments the sales volume is usually high...

To enhance the objectivity of humanmeteorological measurements, various instrumental measurements are required. These equipments are suitable to explore the desired relationships, only if those are able to record simultaneously the individual's physiological and micro-environmental parameters and their transients. It is also important to possibly f...

As in every technical discipline, the objective, reproducible instrumental measurements are indispensable. It is no different at investigating the effect of weather on living organism. The parallel measurement of the atmospheric environment and the physiological parameters is novel and individual, as well as the investigation of epileptic seizures...

As in every technical discipline, the objective, reproducible instrumental measurements are indispensable. It is no different at investigating the effect of weather on living organism. The parallel measurement of the atmospheric environment and the physiological parameters is novel and individual, as well as the investigation of epileptic seizures...

The congenital color vision deficient (CVD) generally demonstrates difficulties in color naming tasks. In our study we investigated color naming properties and uncertainties of a relatively large group of red–green CVDs using quasi monochromatic stimuli and seven basic color terms. The results show a large variability in color naming for the CVD wh...

The authors, based on literature data and own investigations, present the relationship between epileptic fits and certain meteorological factors in the case of a Jack Russell terrier suffering from epilepsy for years. The seizure-classification was based upon long-term observation of the animal, registration of fits by owners, and evaluation by a s...

The authors, based on literature data and own investigations, present that meteorological changes could determine the occurrence of the provoked epileptic fits of an epileptic dog, since aetiology and classification show many analogies between human and canine epilepsy. The symptom-associated meteorological changes included many factors (front acti...

Photochromic compounds change colour on exposure to light, while the reversion may be attributable either to radiation or may be thermal. The use of photochromism on fabrics can provide new opportunities to develop smart textiles; for example, sensors and active protective clothes. Ethyl cellulose‐1,3‐dihydro‐1,3,3,4,5 (and 1,3,3,5,6) ‐pentamethyl‐...

We have developed 3 series of pseudoisochromatic plates for colour vision testing. The plates are arranged in order of increasing difficulty. In the first (red/green) series, a red Landolt C is shown in front of a green background. This series is used to determine the severity of colour vision deficiency. In the second series, colours are located o...

In our current research our aim was to analyze the human visual effect of commercially available fluorescent light sources with similar photometric parameter. Achromatic and chromatic contrast sensitivity tests were used in human subjects to evaluate the effect of the lamps. We have encountered differences using several spatial frequencies and stim...

Recently there has been a growing interest in the selection of product colors for design engineering purposes and for quality control. The selection is generally based on color samples and the quality control is carried out with specific measurement instruments. In low quantity production it is common to avoid instrumental color measurement using h...

Liquid crystal display technology requires the spectral power distribution measurement of the displayed RGB colors. Such measurement tasks are typically resolved by means of spectrophotometers and the measured data is used in several applications. The costs of color management methods have been decreasing recently mainly because of the reduced cost...

In the engineer planning the choice of the colors in production is becoming a very important fact. In production the improvement of the quality assurance has become a great deal. Choice of the color is always made by color samples, but the control of the color is always happening by instrumental measurements. By the quality assurance of line produc...

It is well known that CRT displays have limited color presentation capability. In everyday cases the drawback mainly shows up in the DTP field where the color space of displays does not match the printers' color space, thus the color presented on the display does not correspond completely to printed color. In the contrary case the aim is to present...

The experience of a colored picture is formed of the multitude of spots of different colors and shapes projected on the retina of the eye. The more spots we can distinguish the more details we can see and the more information we can get. It can be observed that people of anomalous color vision are at a disadvantage not only from the point of view o...

To perform a more complete diagnosis on the effect of color vision deficiency on visual performance we measured luminance and color contrast threshold functions. Measurements were carried out on CRT for a range of spatial frequencies on color deficient and normal color vision individuals. Luminance and color contrast threshold is a measure of the r...

Measurement and assessment of CRT monitors' gamma characteristic is both time consuming and requires lot of calculus. Computer design and DTP application requires fast and accurate measurement of gamma characteristic for the purposes of calibration. For that reason, designing and developing a device that would automatically measure and assess gamma...