Heart rate is a critical vital sign for medical diagnosis. There is a growing interest in extracting it without contact, particularly for populations such as premature neonates and the elderly who have fragile skin that may be damaged by traditional sensors. Furthermore, as the population ages, frequent monitoring outside of clinical environments can provide doctors with not just timely samples but also long-term trends and statistical analyses. This continuous monitoring requires a non-obtrusive technology. The Inventors have developed one such method of non-invasive heart monitoring by detecting pulse from head motions in video.