Table 3.

Summary of hybrid DL methods for signal extraction in remote HR measurement pipeline.

Ref.	Year	LSTM	2D CNN	3D CNN	2D CNN + RNN	3D CNN + RNN	GAN
[47]	2019	✓
[48]	2020	✓
[45]	2020		✓				✓
[49]	2021		✓
[50]	2019			✓
[51]	2020			✓
[52]	2020			✓
[53]	2020			✓
[54]	2020			✓
[55]	2019				✓
[56]	2020				✓
[57]	2020				✓
[58]	2021					✓
[59]	2021						✓