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. 2018 Jul 27;9(8):3898–3914. doi: 10.1364/BOE.9.003898

Fig. 3.

Fig. 3

Sequence of images and generated weighting mask sequences based on the top-4 eigenvectors. Regardless of the posture and position of the subject, the weighting mask sequences are consistently biasing the image by attenuating similar parts of the scene. Its validity is based on the assumption that the DC-colors of skin and background remain stable over the (short) time interval used for pulse extraction.