Did anyone ever find a software package or code for this? I'd like to see if it can track zebrafish heart rates...<br><br><br><br><div class="gmail_quote">On Mon, Oct 11, 2010 at 1:03 PM, Eric Boyd <span dir="ltr"><<a href="mailto:mrericboyd@yahoo.com">mrericboyd@yahoo.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">My guess would be that they can't really get HRV. It looks to me like<br>
their analysis system requires multiple beats just to get the heart-rate<br>
accurately (they do the equivalent of an FFT to get it). But given that<br>
they can get HR at all, I'm sure getting HRV is just a matter of time.<br>
Might be hard with only 15Hz webcam though - if my calculations are<br>
right that limits intra-beat timings to +/-4BPM, yes? Or could you<br>
calculate HRV over a big data set?!?<br>
<br>
I am looking forward to having my new pulse-choker stuff (using polar<br>
heart rate receiver and a heart-shaped circuit I have designed), I'm<br>
totally gonna hack a logger into one of them and when I do so I'll share<br>
the data here :-).<br>
<br>
Eric<br>
<div class="im"><br>
On 10/9/10 6:03 PM, Tomm wrote:<br>
> A tray app that monitors your heart rate is a great idea. I wonder if<br>
> the time resolution is good enough to measure heart rate variation<br>
> (HRV)? Variations in heartrate is also pretty interesting:<br>
><br>
> "[...] asked 52 adults to report how often they experienced positive<br>
> emotions like happiness, awe, and gratitude and how socially connected<br>
> they felt in their social interactions every day for a period of nine<br>
> weeks. The researchers also measured the HRV of each individual at the<br>
> beginning and end of the study by measuring heart rate during a<br>
> two-minute session of normal breathing. HRV at the beginning of the<br>
> study predicted how quickly people developed positive feelings and<br>
> experiences of social connectedness throughout the nine-week period. In<br>
> addition, experiences of social connectedness predicted increases in HRV<br>
> at the end of the study, demonstrating a reciprocal relationship between<br>
> heart rate and having satisfying social experiences."<br>
> <a href="http://www.scientificamerican.com/article.cfm?id=the-neuroscience-of-heart" target="_blank">http://www.scientificamerican.com/article.cfm?id=the-neuroscience-of-heart</a><br>
><br>
> Tom<br>
><br>
> On Sat, Oct 9, 2010 at 8:21 AM, Eric Boyd <<a href="mailto:mrericboyd@yahoo.com">mrericboyd@yahoo.com</a><br>
</div><div class="im">> <mailto:<a href="mailto:mrericboyd@yahoo.com">mrericboyd@yahoo.com</a>>> wrote:<br>
><br>
> <a href="http://www.youtube.com/watch?v=LyWnvAWEbWE&feature=player_embedded" target="_blank">http://www.youtube.com/watch?v=LyWnvAWEbWE&feature=player_embedded</a><br>
> <<a href="http://www.youtube.com/watch?v=LyWnvAWEbWE&feature=player_embedded" target="_blank">http://www.youtube.com/watch?v=LyWnvAWEbWE&feature=player_embedded</a>><br>
><br>
> Basically, using nothing other than a webcam (1.3MP, 15 Hz!), they can<br>
> read your heart rate. Then they built that into a "medical mirror", so<br>
> you can see your heart beat in the morning when you brush your teeth :-)<br>
><br>
> I found one of his papers about it online, full text:<br>
><br>
> Non-contact, automated cardiac pulse measurements using video imaging<br>
> and blind source separation<br>
> <a href="http://www.opticsinfobase.org/abstract.cfm?URI=oe-18-10-10762" target="_blank">http://www.opticsinfobase.org/abstract.cfm?URI=oe-18-10-10762</a><br>
><br>
> Looks to me like the big breakthrough here is the motion independence,<br>
> which they got through a combination of face recognition and cropping<br>
> and separating the video into it's three component colors. They claim<br>
> an average error from the reference pulseox reading of less than 1 BPM<br>
> even with movement, that's pretty impressive.<br>
><br>
> Anyone want to write a laptop app which would just keep the webcam on<br>
> all the time and log your heartbeat?<br>
><br>
> Eric<br>
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