System and method for extracting physiological information from remotely detected electromagnetic radiation

The present invention relates to a device and a method for extracting physiological information indicative of at least one health symptom from remotely detected electromagnetic radiation. The device comprises an interface (20) for receiving a data stream comprising remotely detected image data representing an observed region comprising at least one subject of interest (12), wherein the image data comprises wavelength-dependent image information, wherein the wavelength-dependent image information is composed of at least two color channels (96, 98, 100) representative of respective wavelength portions; an image processor (22) for detecting channel signal strength information for at least two of the at least two color channels (96, 98, 100); and a data comparison unit (24) for comparing detected channel signal strengths with respective reference values.</p

Device, system and method for skin detection

The present invention relates to a device, system and method for skin detection. To enable a reliable, accurate and fast skin detection the proposed device comprises an input unit (20) for obtaining a sequence of image frames acquired over time, a segmentation unit (22) for segmenting an image frame of said sequence of image frames, a tracking unit (24) for tracking segments of the segmented image frame over time in said sequence of image frames, and a clustering unit (26) for clustering the tracked segments to obtain clusters representing skin of a subject by use of one or more image features of said tracked segments.</p

Device, system and method for extracting physiological information

The present invention relates to a device, system and a method for extracting physiological information indicative of at least one vital sign of a subject. To provide a high motion robustness, the proposed device comprises an input interface configured to obtain at least two detection signals derived from detected electromagnetic radiation transmitted through or reflected from a skin region of a subject, wherein each detection signal comprises wavelength-dependent reflection or transmission information in a different wavelength channel, a pulse signal computation unit configured to compute at least two pulse signals from said at least two detection signals using different signature vectors for the computation of each pulse signal, a quality indicator computation unit configured to compute quality indicator values for said pulse signals indicating a characteristic of the respective pulse signal, and a processing unit configured to derive physiological information indicative of at least one vital sign from the signature vector that results in the pulse signal with the best quality indicator value and/or from said pulse signal.</p

Device and method for determing vital signs of a subject

The present invention relates to a Device for determining vital signs of a subject comprising an interface (22) for receiving a periodic photoplethysmographic, PPG, signal obtained from a subject (14) by a PPG measurement, a signal partitioning unit (24) for partitioning the PPG signal in time into a plurality of PPG sub-signals covering a half period or an integer multiple of a half period, a normalizing unit (26) for normalizing the PPG signal in advance of the partitioning and/or the PPG sub-signals in time and/or amplitude, a signal combination unit (28) for combining a number of normalized PPG sub-signals to obtain a combined PPG sub-signal, and a vital sign processor (30) for deriving a desired vital sign from the PPG signal, one or more combined PPG sub-signals or an enhanced PPG signal obtained by consecutively arranging a number of combined PPG sub-signals.</p

Device, system and method for extracting physiological information

The present invention relates to a device, system and a method for extracting physiological information indicative of at least one vital sign of a subject. To provide a high motion robustness, the proposed device comprises an input interface (30) for obtaining at least two detection signals (Cn) derived from detected electromagnetic radiation transmitted through or reflected from a skin region of a subject, wherein each detection signal comprises wavelength-dependent reflection or transmission information in a different wavelength channel, a pulse signal computation unit (32) for computing at least two pulse signals (S1, S2) from said at least two detection signals (Cn) using different signature vectors (Pbv1, Pbv2) for the computation of each pulse signal, a quality indicator computation unit (34) for computing quality indicator values (Q1, Q2) for said pulse signals (S1, S2) indicating a characteristic of the respective pulse signal, and a processing unit (38) for deriving physiological information (V) indicative of at least one vital sign from the signature vector that results in the pulse signal with the best quality indicator value (Q1, Q2) and/or from said pulse signal.</p

Device, system and method for extracting physiological information

A device for extracting physiological information indicative of at least one vital sign of a subject from detected electromagnetic radiation transmitted through or reflected from a subject comprises an input interface for receiving a data stream of detection data derived from detected electromagnetic radiation transmitted through or reflected from a skin region of a subject. The detection data comprises wavelength-dependent reflection or transmission information in at least two signal channels representative of respective wavelength portions. A signal mixer dynamically mixes the at least two signal channels into at least one mixed signal. A processor derives physiological information indicative of at least one vital sign from the at least one mixed signal, and a controller controls the signal mixer to limit the relative contributions of the at least two signal channels mixed into at least one mixed signal and/or the rate-of-change at which said relative contributions are allowed to dynamically change.</p

Exact Markovian kinetic equation for a quantum Brownian oscillator

We derive an exact Markovian kinetic equation for an oscillator linearly coupled to a heat bath, describing quantum Brownian motion. Our work is based on the subdynamics formulation developed by Prigogine and collaborators. The space of distribution functions is decomposed into independent subspaces that remain invariant under Liouville dynamics. For integrable systems in Poincar\'e's sense the invariant subspaces follow the dynamics of uncoupled, renormalized particles. In contrast for non-integrable systems, the invariant subspaces follow a dynamics with broken-time symmetry, involving generalized functions. This result indicates that irreversibility and stochasticity are exact properties of dynamics in generalized function spaces. We comment on the relation between our Markovian kinetic equation and the Hu-Paz-Zhang equation.Comment: A few typos in the published version are correcte

The asymptotic regimes of tilted Bianchi II cosmologies

In this paper we give, for the first time, a complete description of the dynamics of tilted spatially homogeneous cosmologies of Bianchi type II. The source is assumed to be a perfect fluid with equation of state $p = (\gamma -1) \mu$, where $\gamma$ is a constant. We show that unless the perfect fluid is stiff, the tilt destabilizes the Kasner solutions, leading to a Mixmaster-like initial singularity, with the tilt being dynamically significant. At late times the tilt becomes dynamically negligible unless the equation of state parameter satisfies $\gamma > {10/7}$. We also find that the tilt does not destabilize the flat FL model, with the result that the presence of tilt increases the likelihood of intermediate isotropization