Table 1 Effect of the type of lighting of the face on the pulse measurement
From: Blood pulsation measurement using cameras operating in visible light: limitations
Type of lighting | Measurement error δ for the adopted level of significance | Comments |
|---|---|---|
Daylight | ±2 [beats per minute] for p < 0.01 | Best results |
LED | ±3 [beats per minute] for p < 0.3 | Dependent on control systems (one-half power results in a greater measurement error) |
Bulb with filament | ±2 [beats per minute] for p < 0.02 | Comparable with visible light |
Fluorescent light bulb | ±4 [beats per minute] for p < 0.1 | A greater error for a higher heart rate |