Koninklijke Philips Corporation N.V.

Fei Comapny

Hendrikus Petrus Maria Sterken

Vincent Jeanne

Willem Hendrik Maes

Robertus Johannes Michael Vucht

The present invention relates to a device () for obtaining a vital sign of a subject (), comprising an interface () for receiving a set of image frames () of a subject (), a signal extraction unit () for extracting a photoplethysmographic (PPG) signal of the subject () from said set of image frames (), a signal evaluation unit () for determining a feature of said PPG signal indicative of the information content of the extracted PPG signal with respect to a desired vital sign of the subject (), a processing unit () for determining a binning configuration based on the determined feature of the extracted PPG signal, said binning configuration being provided for controlling binning of image pixels of an image frame; and a vital signs determination unit () for determining vital sign information from the extracted PPG signal.

Automatic camera adjustment for remote photoplethysmography

Method for performing focusing in a particle-optical device with the aid of astigmatism in the particle beam. In a particle-optical device such as an electron microscope it is advantageous to perform the process of focusing automatically. In accordance with the invention, the electron beam which is to be focused is deliberately made astigmatic to a certain degree. With this astigmatic beam, two images of a specimen are made at two different settings of the objective, after which in each of the images the direction of the astigmatic smearing is determined&#x2014;for example, with the aid of a two-dimensional Fourier transform (FFT). The directions of the astigmatic smearing are perpendicular to each other if, in the transition from a first setting of the objective to a second one, the point of optimum focus is passed. Through a process of interpolation (which process may be iterative) between these two settings, the point of optimum focus can now be determined. Possible anisotropy in the specimen itself can be eliminated by making two images at both of the settings of the objective and by subtracting the FFTs thereof from each other.

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Deurne, Netherlands

Hendrikus Petrus Maria Sterken