Webcam Pulse Detector

#1

Post by theschwa » Tue, Apr 16, 2013, 3:21 AM UTC

Re: Webcam Pulse Detector

#2

Post by theschwa » Tue, Apr 16, 2013, 3:22 AM UTC

The paper that this is based on is also pretty fascinating: Eulerian Video Magnification for Revealing Subtle Changes in the World http://people.csail.mit.edu/mrub/vidmag/

Re: Webcam Pulse Detector

#3

Post by gluxon » Tue, Apr 16, 2013, 4:00 AM UTC

What in the world? Is this magic?

Re: Webcam Pulse Detector

#4

Post by dyno12345 » Tue, Apr 16, 2013, 4:00 AM UTC

I want to point it at crowds and get an aggregate crowd-pulse rate! Measure the excitement!

Re: Webcam Pulse Detector

#5

Post by [deleted] » Tue, Apr 16, 2013, 4:20 AM UTC

gluxon wrote: post #3

What in the world? Is this magic?

[deleted]

Re: Webcam Pulse Detector

#6

Post by hcarvalhoalves » Tue, Apr 16, 2013, 4:34 AM UTC

How precise is this, do we have data? I'm guessing it depends on the refresh rate of your webcam.

Re: Webcam Pulse Detector

#7

Post by AdamTReineke » Tue, Apr 16, 2013, 4:37 AM UTC

gluxon wrote: post #3

What in the world? Is this magic?

On each heartbeat, blood is pushed and makes the skin nearly unperceivably redder. By watching for and tracking this subtle change, you can extract a heartbeat.

Re: Webcam Pulse Detector

#8

Post by toomuchtodo » Tue, Apr 16, 2013, 4:37 AM UTC

dyno12345 wrote: post #4

I want to point it at crowds and get an aggregate crowd-pulse rate! Measure the excitement!

I expect to see this used by DJs, where the momentum of the music is controlled by the crowd.

Re: Webcam Pulse Detector

#9

Post by pokpokpok » Tue, Apr 16, 2013, 4:37 AM UTC

hcarvalhoalves wrote: post #6

How precise is this, do we have data? I'm guessing it depends on the refresh rate of your webcam.

it should still be very accurate though right? and so decently precise over a period of time?

Re: Webcam Pulse Detector

#10

Post by nl » Tue, Apr 16, 2013, 4:41 AM UTC

hcarvalhoalves wrote: post #6

How precise is this, do we have data? I'm guessing it depends on the refresh rate of your webcam.

It's precise enough for the application.

Webcams typically have a 15-30 fps framerate. Heartrates are typically 30-200 bpm (~= 0.5 to 3.3 bps).