how android heart rate monitor app works

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Some one please tell me how android Heart rate monitor apps works and how they measures heart beat thorough camera
app Link: https://play.google.com/store/apps/details?id=com.macropinch.hydra.android&hl=en[^]

Thank you..!

Posted 13-Nov-14 18:32pm

Shariq93

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Peter Leow · Accepted Answer · 2014-11-13T18:48:00

Solution 1

Quote:
Cardiograph works by illuminating your index finger with your device's camera flash, rendering your finger red and measuring the changes in the color caused by your pulse.

from cardiograph[^]

Posted 13-Nov-14 18:48pm

Peter Leow

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Shariq93 14-Nov-14 0:59am

Thank You Friend :)
Can you tell me any code Hint if possible