US 9,955,880 B2Granted

Estimating physiological parameters

AssigneeTata Consultancy Services Limited

InventorsAishwarya Visvanathan, Arpan Pal, Aniruddha Sinha, Rohan Banerjee, Anirban Dutta Choudhury, Aditi Mishra, Avik Ghose

Life of this patent

Estimating the term…

patentgrep

Loading patent…

Abstract

A physiological parameter measurement device comprising a processor and a video processing module coupled to the processor to divide each of a plurality of frames of a video into a plurality of blocks, where the video is of a body part of a subject whose physiological parameter is to be determined. The video processing module further is to select a block having highest peak signal to noise ratio (PSNR) from amongst the plurality of blocks. Further, the video processing module is to extract a photoplethysmogram (PPG) signal from the video based on a block identifier associated with the block. The physiological parameter measurement device further comprises a signal enhancement module coupled to the processor, to process the PPG signal to obtain an enhanced PPG signal for determining a value of the physiological parameter for the subject.

Claims14

Dependent claims

A physiological parameter measurement (PPM) device, the PPM device comprising:

a processor;
a video processing module coupled to the processor to,
divide each of a plurality of frames of a video into a plurality of blocks, wherein the video is of a body part of a subject whose physiological parameter is to be determined;
select a block, from amongst the plurality of blocks, having highest peak signal to noise ratio (PSNR);
extract a photoplethysmogram (PPG) signal from the video based on a block identifier associated with the block, wherein the video processing module is further configured to:
adjust an intensity level of a flash of a camera of the PPM device to operate the camera at one or more intensity levels of the flash for capturing a test video of the subject at each of the one or more intensity levels of the flash;
for each of the one or more intensity levels of the flash, determine a PSNR for the test video captured at the intensity level of flash;
determine, from amongst the test videos captured at the one or more intensity levels of the flash, a test video having highest PSNR;
and
capture the video of the subject at the intensity level of flash corresponding to the test video having the highest PSNR;
and
a signal enhancement module coupled to the processor to,
enhance the PPG signal for determining a value of the physiological parameter associated with the subject.

10 more elements

A non-transitory computer-readable medium having embodied thereon a computer program for executing a method comprising:

dividing, by a processor, each of a plurality of frames of a video into a plurality of blocks, wherein the video is of a body part of a subject whose physiological parameter is to be determined;
selecting a block, from amongst the plurality of blocks, having highest peak signal to noise ratio (PSNR);
extracting a photoplethysmogram (PPG) signal from the video based on a block identifier associated with the block;
enhancing the PPG signal for determining a value of the physiological parameter for the subject;
adjusting an intensity level of a flash of a camera to operate the camera at one or more intensity levels of the flash for capturing a test video of the subject at each of the one or more intensity levels of the flash;
for each of the one or more intensity levels of the flash, determining a PSNR for a test video captured at the intensity level of flash;
determining, from amongst the test videos captured at the one or more intensity levels of the flash, a test video having highest PSNR;
and
capturing the video of the subject at the intensity level of flash corresponding to the test video having the highest PSNR.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/665,657Filed 23 Mar 2015
Priority: IN 3396/MUM/201427 Oct 2014
Published: US 2016/0113531 A128 Apr 2016
Granted: 1 May 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

A61B 5/02416
Measuring pulse rate or heart rate: using photoplethysmograph signals, e.g. generated by infrared radiation
A61B 5/0082
Using light, e.g. diagnosis by transillumination, diascopy, fluorescence: adapted for particular medical purposes
A61B 5/02438
Measuring pulse rate or heart rate: with portable devices, e.g. worn by the patient
A61B 5/14551
Using optical sensors, e.g. spectral photometrical oximeters: for measuring blood gases