title: Detect Heart Rate using iPhone Camera
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/9274027/detecting-heart-rate-using-the-camera">Detecting heart rate using the camera</a>  </p>
  </blockquote>
  
  
  
  <p>I am working on detecting pulse rate in iOS. I have done some search and now I am able to read heart beats using external bluetooth device which is capable of reading heart beats. But now I am ver curious about detecting pulse using iPhone camera. I am trying to understand How it can be done? What is actual theory behind that? Can any one have an idea behind this?</p>
  
  <p>According to my search I found that I need to use camera in video mode. And I need to compare each frames from that video for colour changes. When our heart pumps blood into our body, colours are changed with every pump. So how will I get that colour change using camera or is there any other way to do this? </p>