Detecting heart rate using the camera

Question

I need the same functionality as the application Instant Heart Rate.

The basic process requires the user to:

1. Place the tip of the index f

Answer 1

Check out this..

// switch on the flash in torch mode  
 if([camera isTorchModeSupported:AVCaptureTorchModeOn]) {  
 [camera lockForConfiguration:nil];  
 camera.torchMode=AVCaptureTorchModeOn;  
 [camera unlockForConfiguration];  
 }  

  [session setSessionPreset:AVCaptureSessionPresetLow];

   // Create the AVCapture Session  
   session = [[AVCaptureSession alloc] init];  

  // Get the default camera device  
   AVCaptureDevice* camera = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];  
  if([camera isTorchModeSupported:AVCaptureTorchModeOn]) {  
    [camera lockForConfiguration:nil];  
  camera.torchMode=AVCaptureTorchModeOn;  
    [camera unlockForConfiguration];  
 }  
 // Create a AVCaptureInput with the camera device  
    NSError *error=nil;  
     AVCaptureInput* cameraInput = [[AVCaptureDeviceInput alloc] initWithDevice:camera error:&error];  
   if (cameraInput == nil) {  
    NSLog(@"Error to create camera capture:%@",error);  
  }  

    // Set the output  
    AVCaptureVideoDataOutput* videoOutput = [[AVCaptureVideoDataOutput alloc] init];  

   // create a queue to run the capture on  
  dispatch_queue_t captureQueue=dispatch_queue_create("catpureQueue", NULL);  

   // setup our delegate  
   [videoOutput setSampleBufferDelegate:self queue:captureQueue];  

    // configure the pixel format  
    videoOutput.videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber     numberWithUnsignedInt:kCVPixelFormatType_32BGRA], (id)kCVPixelBufferPixelFormatTypeKey,  
     nil];  
   // cap the framerate  
   videoOutput.minFrameDuration=CMTimeMake(1, 10);  
  // and the size of the frames we want  
  [session setSessionPreset:AVCaptureSessionPresetLow];  

   // Add the input and output  
   [session addInput:cameraInput];  
   [session addOutput:videoOutput];  

   // Start the session  

    [session startRunning];  

   - (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection {  



   // this is the image buffer  

  CVImageBufferRef cvimgRef = CMSampleBufferGetImageBuffer(sampleBuffer);  


   // Lock the image buffer  

  CVPixelBufferLockBaseAddress(cvimgRef,0);  


  // access the data  

  int width=CVPixelBufferGetWidth(cvimgRef);  
  int height=CVPixelBufferGetHeight(cvimgRef);  


  // get the raw image bytes  
  uint8_t *buf=(uint8_t *) CVPixelBufferGetBaseAddress(cvimgRef);  
  size_t bprow=CVPixelBufferGetBytesPerRow(cvimgRef);  


// get the average red green and blue values from the image  

 float r=0,g=0,b=0;  
 for(int y=0; y

Sample Code Here