DESC:ESTIMATING PHYSIOLOGICAL PARAMETERS ,CLAIMS:1. A physiological parameter measurement (PPM) device (100), the PPM device (100) comprising:
a processor (102);
a video processing module (110) coupled to the processor (102) 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; and
a signal enhancement module (112) coupled to the processor (102) to,
enhance the PPG signal for determining a value of the physiological parameter associated with the subject.
2. The PPM device (100) as claimed in claim 1, wherein the video processing module (110) further is to compute a PSNR for each of the plurality of blocks.
3. The PPM device (100) as claimed in claim 1, wherein the video processing module (110) further is to,
determine the block identifier associated with the block; and
identify a region in each frame of the video based on the block identifier; and
select the identified region corresponding to each of the frames of the video for extracting the PPG signal.
4. The PPM device (100) as claimed in claim 1, wherein the signal enhancement module (112) further is to,
filter the PPG signal to obtain a filtered PPG signal; and
apply an interpolation technique on the filtered PPG signal to enhance the PPG signal.
5. The PPM device (100) as claimed in claim 1, wherein the video processing module (110) further is to,
adjust an intensity level of a flash of a camera (128) of the PPM device (100) to operate the camera (128) 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.
6. A method comprising:
dividing, by a processor (102), 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; and
enhancing the PPG signal for determining a value of the physiological parameter for the subject.
7. The method as claimed in claim 6, wherein the method further comprises computing a PSNR for each of the plurality of blocks.
8. The method as claimed in claim 6, wherein the extracting comprises:
ascertaining the block identifier associated with the block; and
identifying a region in each frame of the video based on the block identifier; and
selecting the region corresponding to each of the frames of the video for extracting the PPG signal.
9. The method as claimed in claim 6, wherein the enhancing the PPG signal further comprises:
filtering the PPG signal to obtain a filtered PPG signal; and
applying an interpolation technique on the filtered PPG signal to enhance the PPG signal.
10. The method as claimed in claim 6, wherein the physiological parameter comprises at least one of a heart rate, a blood pressure, and an oxygen saturation.
11. The method as claimed in claim 6, wherein the method further comprises:
adjusting an intensity level of a flash of a camera (128) to operate the camera (128) 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.
12. A non-transitory computer-readable medium having embodied thereon a computer program for executing a method comprising:
dividing, by a processor (102), 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; and
enhancing the PPG signal for determining a value of the physiological parameter for the subject.