Noncontact Heart Rate Measurement Using a Webcam, Based on Joint Blind Source Separation and a Skin Reflection Model: For a Wide Range of Imaging Conditions

Figure 13

Bland-Altman plots of and under repeated stepwise illumination changes. The central solid red line indicates the mean difference, and the outer dashed blue lines refer to the upper and lower 95% limits of agreement. (a) and (b) are the plots of the pale-skinned subjects and the dark-skinned subjects, respectively.

(a)

(b)