Contact-less blood pressure measurement

A system comprising:

• memory;
• and
• one or more processing devices configured to:
• receive optical data including information associated with a subject,
• determine, from the optical data, a first dataset representing time-varying color change at a first body part of the subject,
• determine, from the optical data, a second dataset representing time-varying characteristics at a second body part of the subject,
• identify a first point in the first dataset, the first point representing a time at which a pulse pressure wave traverses the first body part of the subject,
• identify a second point in the second dataset, the second point representing a time at which the pulse pressure wave traverses the second body part of the subject, and
• compute a pulse transit time (PTT) as a difference between the first and second points, the PTT representing a time taken by the pulse pressure wave to travel from the second body part to the first body part of the subject.

One or more machine-readable storage devices storing instructions that, upon execution by one or more processing devices, cause the one or more processing devices to perform operations comprising:

• receiving optical data including information associated with a subject;
• determining from the optical data, a first dataset representing time-varying color change at a first body part of the subject;
• determining from the optical data, a second dataset representing time-varying characteristics at a second body part of the subject;
• identifying a first point in the first dataset, the first point representing a time at which a pulse pressure wave traverses the first body part of the subject;
• identifying a second point in the second dataset, the second point representing a time at which the pulse pressure wave traverses the second body part of the subject;
• and
• computing a pulse transit time (PTT) as a difference between the first and second points, the PTT representing a time taken by the pulse pressure wave to travel from the second body part to the first body part of the subject.