How adjusting the right frequency of saving?

Hello!

I am working on a project, that has to detect pulse of a person in distance. I am using Matlab 2009b with Image Processing toolbox.

At this moment, I save some videos at different frequencies (I used the code on http://sourceforge.net/projects/kinect-mex/ .) What I would like is synchronizing the saving frequency of a video with the right frequency "at the real time".

I mean, I want to save some videos on Matlab then using these videos for measuring the frequency of the pulse of a person. The problem is the frequency of Matlab is a little hazardous (the frequency can go from 5 to 25 Hz...)

The ideal is measuring the correct frequency of a pulse.

What can I do, in this case?

Answer 1

[Image Analyst]

I can see the interest in detecting pulse (heart rate) from a security/surveillance aspect, but I really doubt that you can detect the pulse of a person from the kinds of videos you showed on that web site. If anything you'd need a closeup view of some blood vessels taken with the appropriate wavelength of radiation/illumination. Can you show a few frame of the video that show the "beat" and "non-beat"?

[Aubry]

In fact, I use two different codes.

One for saving videos. Another for detecting the pulse (<http://people.csail.mit.edu/mrub/vidmag/>)

It is a question of frequency, here. I would like applying the second code on matlab videos. It may have a problem of synhronization.

[Image Analyst]

I can't help you per the FAQ, but perhaps the folks at MIT who authored that code could give you some pointers. I would think that saving the videos as frequent as possible would be good so then they can get analyzed as promptly as possible. If you saved the video every 30 minutes then you'd only know the pulse from 30 minutes ago. If you saved the video every 1 minutes, your lag time would be only 1 minute.