Search results for " estimation"
showing 10 items of 562 documents
Estimating Stress in Online Meetings by Remote Physiological Signal and Behavioral Features
2022
Work stress impacts people’s daily lives. Their well-being can be improved if the stress is monitored and addressed in time. Attaching physiological sensors are used for such stress monitoring and analysis. Such approach is feasible only when the person is physically presented. Due to the transfer of the life from offline to online, caused by the COVID-19 pandemic, remote stress measurement is of high importance. This study investigated the feasibility of estimating participants’ stress levels based on remote physiological signal features (rPPG) and behavioral features (facial expression and motion) obtained from facial videos recorded during online video meetings. Remote physiological sign…
Helsingin osa-alueiden työvoimatilastojen estimointi pienaluetekniikalla valtakunnallisesta työvoimatutkimuksesta
1997
Biomass estimator for NIR image with a few additional spectral band images taken from light UAS
2012
A novel way to produce biomass estimation will offer possibilities for precision farming. Fertilizer prediction maps can be made based on accurate biomass estimation generated by a novel biomass estimator. By using this knowledge, a variable rate amount of fertilizers can be applied during the growing season. The innovation consists of light UAS, a high spatial resolution camera, and VTT's novel spectral camera. A few properly selected spectral wavelengths with NIR images and point clouds extracted by automatic image matching have been used in the estimation. The spectral wavelengths were chosen from green, red, and NIR channels.
Optical measurement of virtual reality headset performance
2018
Virtuaalitodellisuussilmikoiden päänseurantajärjestelmän suorituskyvyn mittaamista varten kehitettiin mittausmenetelmä ja sulautettu kameramoduuli. Kyse on päästä päähän mittauksesta (engl. end-to-end measurement), jossa robotti liikuttaa silmikkoa ja kamera mittaa sisällön muutoksia näytöllä. Tavoitteena on optisesti mitata päänseurantajärjestelmän tarkkuutta kuvaamalla näytön sisältöä näytön virkistykseen tahdistettuna. Työssä keskityttiin kameramoduulin ja siihen liittyvien konenäköalgoritmien kehittämiseen. Mittauksessa näytöllä on kolmiulotteinen kohde, jossa on tunnistettavia pisteitä. Paikallistamalla nämä pisteet kuvassa voidaan määrittää grafiikkamoottorin virtuaalisen kameran asen…
Time estimation in Alzheimer and the role of the central executive
2004
The aim of this study was to evaluate the role of short-term memory and attention in time estimation. For this purpose we studied prospective time verbal estimation in 21 patients with Alzheimer's disease (AD), and compared their performance with that of 21 matched normal controls in two different conditions: during a digit span task and during an attentional task. Results showed that the performance of AD patients was significantly worse than that of the controls; the interaction between group and condition was significant. We suggest a role of attentional-executive functions in prospective time estimation.
Estimation of the Time-Variant Velocity of a Single Walking Person in Two-Dimensional Non-Stationary Indoor Environments Using Radio-Frequency Techni…
2020
Accurate estimation of the time-variant (TV) velocity of moving persons/objects in indoor spaces is of crucial importance for numerous wireless indoor applications. This article introduces a novel iterative procedure to estimate the TV velocity, i.e., TV speed and TV angle-of-motion (AOM), of a single moving person in 2D indoor environments by using radio-frequency (RF) techniques. The indoor area is equipped with a distributed 2 × 2 multiple-input multiple-output (MIMO) system. The proposed method is divided into two parts. In the first part, we estimate the path gains and the instantaneous Doppler frequencies by fitting the exact spectrograms of the complex channel gains of a 2D no…
The forecasting of the roadside pollutant levels to evaluate traffic management measures in Palermo.
2015
The road transport has become the major source of environmental degradation in urban centres. It produces negative externalities (i.e. pollution, delay, etc.) that are usually connected with the queues of traffic flows and the congestion of the road network. The quantitative estimation of roadside pollutant levels is very complex. Many variables are involved such as the type of vehicle (characterized by different antipollution devices, used fuels, engine temperatures, maintenance level of engines, etc.), the different cinematic conditions of the flows, the urban/road network structure, the weather conditions, etc. Therefore it is important to develop scientific tools able to predict roadsid…