Table 1 Summary of the measurement set-up, signal domain analysis and results of reference works

[13]

1 = sitting still

2 = natural movements (no large or rapid movements)

12

1 min

640 × 480

(15 fps)

FD

[16]

1 = sitting still

2 = natural human-computer interaction

10

(1) 1 min

(2) 20 min

640 × 480

(30 fps)

FD

[17]

Sitting still in front of a laptop

12

1 min

640 × 480

(15 fps)

TD, FD^†

[18]

Resting conditions (palm of the subject’s hand)

10

4 min

384 × 256

(200 fps)

TD, FD^†

[19]

1 = sitting at rest

2 = sitting under stress

(1) 9

(2) 10

2 min

960 × 720

(30 fps)

TD, FD^†

[20]

1 = sitting at rest

2 = sitting under stress

11

2 min

960 × 720

(30 fps)

TD

[21]

1 = supine position

2 = sitting position (controlled illumination, synchronized breathing and eyes closed)

(1) 12

(2) 8

5 min

640 × 480

(30 fps)

TD, FD^†

[22]

Sitting still in front of a camera

(1 = ICA-based method

2 = EVM-based method)

12

2 min

720 × 480

(30 fps)

TD, FD^†

[23]

1 = sitting still and calm

2 = sitting with pre-defined head movements

12

35 s

320 × 240

(30 fps)

TD

[24]

1 = stationary

2 = reading

3 = watching video

4 = talking

5

80 s

1280 × 1024

(30 fps)

TD

[25]

1 = sitting still

2 = reading without motion

3 = reading without further instructions

4

2 min

800 × 600

(30 fps)

TD

[26]

1 = static

2 = static with makeup

3 = occasional motion

4 = frequent motion

(1) 4

(2) 3

(3) 3

(4) 2

1 min

640 × 480

(30 fps)

TD