Fig. 3

Comparison of separation results using different ICA/BSS methods. a There is a segment of R/G/B signals contains less apparent BVP signals in G channel (see the green circle mark), b after separated by JADE, two ICs contain BVP components emerge in results (see the red circle mark), and c the situation of FastICA is similar to JADE, d furthermore, InfomaxICA algorithm separated out a satisfactory BVP signal (see the yellow circle mark), e at last, a superior BVP with an outstanding amplitude is obtained by SOBI algorithm (see the blue circle mark)