[Cyborg] medical mirror

Todd Anderson tanders at stanford.edu
Wed Oct 20 23:51:15 PDT 2010


Yea, I was hoping to just feed it the fish data.  I have experience with
ICA, so I think I'll just use the paper as inspiration!


On Wed, Oct 20, 2010 at 7:54 PM, Eric Boyd <mrericboyd at yahoo.com> wrote:

> 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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>>
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