[Cyborg] medical mirror
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
> actually has enough technical details that you could probably write code.
> Of course that's a big project :-).
> 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
>> 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
>> the data here :-).
>> 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
>> > they felt in their social interactions every day for a period of
>> > 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
>> > heart rate and having satisfying social experiences."
>> > 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:
>> > 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
>> > 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
>> > which they got through a combination of face recognition and
>> > 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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