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 12

Bland-Altman plots of and under different light intensities (LC1 to LC5). The central solid red line indicates the mean difference, and the outer blue dashed lines show the upper and lower 95% limits of agreement. From (a) to (e), the left and right columns show the plots for the light- and dark-skinned subjects, respectively.

(a) LC1 condition

(b) LC2 condition

(c) LC3 condition

(d) LC4 condition

(e) LC5 condition