A dataframe containing sample JSON output format of the heartrate data, containing red, green, blue levels from the camera sensor, indexed along the timestamp t.
heartrate_data
A data frame with 3661 rows (observations) and 7 variables:
time, in seconds
mean green intensity across the frame at the given timestamp
mean blue intensity across the frame at the given timestamp
mean red intensity across the frame at the given timestamp
A video(240p) of a finger covering the smartphone camera with the flash turned on was recorded at 60fps. The average intensity of all the pixels per frame in all the three color channels was calculated, and indexed along the timestamp of the frame.