Methods and devices are disclosed for calibrating intensity of a light source in a system of evaluating a skin lesion using Elastic-Scattering Spectroscopy (ESS). The ESS system may illuminate a sample of the skin lesion with a pulse from the light source adjusted to a high output setting, receive a signal comprising an elastic scattering spectrum from illuminating the skin lesion sample at the high output setting, determine whether the received signal has an intensity that is greater than a saturation threshold associated with at least one optical detection sensor, and if so, store the elastic scattering spectrum from illuminating the skin lesion sample at the high output setting. If not greater than the saturation threshold, the ESS system may illuminate the skin lesion sample with a pulse from the light source adjusted to a low output setting, receive a signal comprising an elastic scattering spectrum from illuminating the skin lesion sample at the low output setting, and store the elastic scattering spectrum from illuminating the skin lesion sample at the low output setting.

An optoelectronic sensor (01), a control method for the optoelectronic sensor (01), and a pulse monitor including the optoelectronic sensor (01). The optoelectronic sensor (01) may include a light source (10), a first receiver (20), a second receiver (30), and a phantom material layer (40) that is facing a light-emitting side of the light source (10) and at least partially overlapping with the second receiver (30).

The invention relates to a method to determine the wavelength dependent absorption coefficient of a turbid medium using overlapping illumination-detection areas comprising the steps of a) retrieving a calibration spectrum (CA) from a reference measurement using a reference sample; b) carrying out a measurement on an actual sample for determining the absolute reflection spectrum (R.sub.abs) using a raw spectrum measured on the sample (S.sub.medium) and the calibration spectrum (C.sub.); C) using the absolute reflection spectrum (R.sub.abs) for determining the wavelength dependent absorption coefficient by minimizing the difference between the measured absolute reflection spectrum (R.sub.abs) and a model function (R.sub.abs.sup.model). wherein the model function (R.sub.abs.sup.model) is modelled using a predetermined equation based on prior knowledge of the combination of a dependence of the effective photon path length (L.sub.PF) on a scattering phase function (PF); a dependence of the absolute reflectance in the absence of absorption (R.sub.abs.sup.0) on scattering phase function (PF). The invention further relates to a system and a computer program product for determining the wavelength dependent absorption coefficient of a turbid medium.

A digital image is captured. The captured digital image includes a calibration pattern. The calibration pattern includes displayed information about the calibration pattern. The displayed information is read to obtain calibration information about the captured digital image.

Quantitative colorimetric carbon dioxide measurement and measurement systems and methods are disclosed. The methods can include methods for calibrating a chemical colorimetric indicator used in the quantitative colorimetric carbon dioxide measurement system. Apparatuses are disclosed including a cartridge comprising a chemical colorimetric indicator that is configured to removably engage with a quantitative colorimetric measurement system. Cartridges containing a sealed container comprising a reference gas with a known concentration of carbon dioxide are also disclosed. Systems and methods for humidifying the chemical colorimetric indicator are also provided. Methods for using the systems are also disclosed including providing a breathing therapy to a patient or user.

In one embodiment, an imaging system illuminates a surface of tissue with one or more spots of near-infrared (NIR) light within a field of view of a camera of the imaging system. The imaging system captures an image of the one or more spots of NIR light within the field of view of the camera of the imaging system. The imaging system calculates, for each of the one or more spots of NIR light in the captured image, a spot diameter, spot position, or spot shape in the captured image. The imaging system determines a distance between the imaging system and the surface of tissue, based on the calculated spot diameter, spot position, or spot shape of the one or more spots of NIR light in the captured image. The imaging system provides data indicative of the determined distance between the imaging system and the surface of tissue to an electronic display.

An imaging device including a support, a mouth retractor fastened to the support and defining a retractor opening and structure for fastening an image acquisition apparatus to the support in a position in which the acquisition apparatus is oriented so as to receive an image of the retractor opening.

A system and method for non-invasive and/or non-contact measurement of a subject's tremor in the context of therapeutic intervention is presented. The system includes a memory, a communications interface, a sensor to measure a signal associated with position or motion of an extremity of the subject, and a processor. The processor is configured to receive the signal from the sensor. The processor is further configured to communicate, via the communications interface, the signal, login credentials, and position or motion data to a remote server coupled to a remote electronic health record database. The remote server is configured to receive the signal and perform an analysis that quantifies a severity of tremor based on the position or motion signals of the subject. The processor is configured to receive the analysis that quantified the severity of tremor and cause the quantified severity of tremor to be displayed via a display device.

Systems, methods and apparatus are provided through which in some aspects an ocular scene is imaged and changes in the ocular scene relative to a calibration image, are tracked. In one aspect, an imaging instrument includes an eyepiece, a light source operable to project light, an imaging system operable to image an ocular scene; and a processing system operable to receive a set of calibration images, and further operable to capture an image of the imaged ocular scene associated with a calibration image. In another aspect, a method to track changes in an ocular scene includes receiving a set of calibration images, receiving a set of landmarks on each calibration image, capturing a set of images of an ocular scene, associating each captured image with a calibration image, and detecting landmarks on each captured image wherein each detected landmark corresponds to a landmark on the associated calibration image.

A motion capture system includes a wearable device (e.g. a glove) suitable for being worn by a user and including one or more markers having respective colors. A video camera acquires a sequence of color frames of the user moving while wearing the glove, while a range camera acquires corresponding depth frames of the same scene. A processing unit processes both color frames and depth frames for reconstructing the 3D positions of the markers. In particular, the depth information provided by the depth frames are used for isolating a validity area within the color frames, and the markers are searched based on their colors, exclusively within the validity area of the color frames. The movements of the user are then captured as a sequence of positions of the markers. Combined use of color information and depth information provide a very reliable and accurate motion capture.