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. 2018 Mar 22;9(4):1809–1826. doi: 10.1364/BOE.9.001809

Table 2.

Description of all the features used in the experiment

PPG Output Real image Multispectral Images
  • 1.

    PPG Output Image

  • 2.

    Maximum over mean

  • 3.

    Standard deviations away from mean

  • 4.

    Number of crossings

  • 5.

    SNR

  • 6.

    Improved SNR

  • 7.

    Lighting normalized

  • 8.

    PPG image Normalized

  • 9.

    Standard deviation

  • 10.

    Skewness

  • 11.

    Kurtosis

  • 12.

    X-gradient

  • 13.

    Y-gradient

  • 14.

    Standard deviation of the gradients
  • 1.

    Real image

  • 2.

    Real image normalized

  • 3.

    Skewness

  • 4.

    Kurtosis

  • 5.

    X-gradient

  • 6.

    Y-gradient

  • 7.

    Standard deviation within X-gradient

  • 8.

    Standard deviation within a small neighborhood

  • 9.

    Range within a small neighborhood normalized

  • 10.

    Standard deviation within a big neighborhood

  • 11.

    Range within a big neighborhood normalized
  • 1.

    MSI λ1

  • 2.

    MSI λ2

  • 3.

    MSI λ3

  • 4.

    MSI λ4

  • 5.

    MSI λ5

  • 6.

    MSI λ6

  • 7.

    MSI λ7

  • 8.

    MSI λ8