[Cyborg] medical mirror

Eric Boyd mrericboyd at yahoo.com
Wed Oct 20 19:54:00 PDT 2010


The article I linked

http://www.opticsinfobase.org/abstract.cfm?URI=oe-18-10-10762

actually has enough technical details that you could probably write 
code.  Of course that's a big project :-).

Eric




On 10/20/10 10:46 PM, Todd Anderson wrote:
> Did anyone ever find a software package or code for this?  I'd like to
> see if it can track zebrafish heart rates...
>
>
>
> On Mon, Oct 11, 2010 at 1:03 PM, Eric Boyd <mrericboyd at yahoo.com
> <mailto:mrericboyd at yahoo.com>> wrote:
>
>     My guess would be that they can't really get HRV.  It looks to me like
>     their analysis system requires multiple beats just to get the heart-rate
>     accurately (they do the equivalent of an FFT to get it). But given that
>     they can get HR at all, I'm sure getting HRV is just a matter of time.
>     Might be hard with only 15Hz webcam though - if my calculations are
>     right that limits intra-beat timings to +/-4BPM, yes?  Or could you
>     calculate HRV over a big data set?!?
>
>     I am looking forward to having my new pulse-choker stuff (using polar
>     heart rate receiver and a heart-shaped circuit I have designed), I'm
>     totally gonna hack a logger into one of them and when I do so I'll share
>     the data here :-).
>
>     Eric
>
>     On 10/9/10 6:03 PM, Tomm wrote:
>      > A tray app that monitors your heart rate is a great idea.  I
>     wonder if
>      > the time resolution is good enough to measure heart rate variation
>      > (HRV)?  Variations in heartrate is also pretty interesting:
>      >
>      > "[...] asked 52 adults to report how often they experienced positive
>      > emotions like happiness, awe, and gratitude and how socially
>     connected
>      > they felt in their social interactions every day for a period of nine
>      > weeks. The researchers also measured the HRV of each individual
>     at the
>      > beginning and end of the study by measuring heart rate during a
>      > two-minute session of normal breathing. HRV at the beginning of the
>      > study predicted how quickly people developed positive feelings and
>      > experiences of social connectedness throughout the nine-week
>     period. In
>      > addition, experiences of social connectedness predicted increases
>     in HRV
>      > at the end of the study, demonstrating a reciprocal relationship
>     between
>      > heart rate and having satisfying social experiences."
>      >
>     http://www.scientificamerican.com/article.cfm?id=the-neuroscience-of-heart
>      >
>      >       Tom
>      >
>      > On Sat, Oct 9, 2010 at 8:21 AM, Eric Boyd <mrericboyd at yahoo.com
>     <mailto:mrericboyd at yahoo.com>
>      > <mailto:mrericboyd at yahoo.com <mailto:mrericboyd at yahoo.com>>> wrote:
>      >
>      >
>     http://www.youtube.com/watch?v=LyWnvAWEbWE&feature=player_embedded
>     <http://www.youtube.com/watch?v=LyWnvAWEbWE&feature=player_embedded>
>      >
>     <http://www.youtube.com/watch?v=LyWnvAWEbWE&feature=player_embedded
>     <http://www.youtube.com/watch?v=LyWnvAWEbWE&feature=player_embedded>>
>      >
>      >     Basically, using nothing other than a webcam (1.3MP, 15 Hz!),
>     they can
>      >     read your heart rate.  Then they built that into a "medical
>     mirror", so
>      >     you can see your heart beat in the morning when you brush
>     your teeth :-)
>      >
>      >     I found one of his papers about it online, full text:
>      >
>      >     Non-contact, automated cardiac pulse measurements using video
>     imaging
>      >     and blind source separation
>      > http://www.opticsinfobase.org/abstract.cfm?URI=oe-18-10-10762
>      >
>      >     Looks to me like the big breakthrough here is the motion
>     independence,
>      >     which they got through a combination of face recognition and
>     cropping
>      >     and separating the video into it's three component colors.
>       They claim
>      >     an average error from the reference pulseox reading of less
>     than 1 BPM
>      >     even with movement, that's pretty impressive.
>      >
>      >     Anyone want to write a laptop app which would just keep the
>     webcam on
>      >     all the time and log your heartbeat?
>      >
>      >     Eric
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