| CPC A61B 5/02108 (2013.01) [A61B 5/681 (2013.01)] | 12 Claims |
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1. An apparatus for measuring bio-information, the apparatus comprising:
a light source comprising a green light emitter configured to emit green light of a green wavelength range, and an infrared light emitter configured to emit infrared light of a infrared wavelength range;
an image sensor comprising an n number of pixel rows, n denotes a number that is equal to or greater than 10, wherein:
among the n number of pixel rows, a first set of alternating number rows comprises a plurality of green pixels configured to detect the green light and reacted with an object, without detecting the infrared light, and
among the n number of pixel rows, a second set of alternating number rows comprises a plurality of infrared pixels configured to detect the infrared light and reacted with the object, without detecting the green light, wherein the second set of alternating number rows alternates with the first set of alternating number rows; and
a pixel controller configured to control the image sensor row-by-row to simultaneously activate the plurality of green pixels in a first pixel row while simultaneously deactivating the plurality of infrared pixels in a second pixel row during a first time period, and simultaneously activate the plurality of infrared pixels in the second pixel row while simultaneously deactivating the plurality of green pixels in the first pixel row during a second time period;
a light source controller configured to control the green light emitter to emit the green light when a green light exposure operation is performed on the plurality of green pixels, and control the infrared light emitter to emit the infrared light when a infrared light exposure operation is performed on the plurality of infrared pixels; and
a processor configured to;
for one frame of the image sensor, obtain a green photoplethysmogram (PPG) signal based on green light signals detected by the first set of alternating number rows of the image sensor, and obtain an infrared PPG signal based on infrared light signals detected by the second set of alternating number rows of the image sensor; and
estimate blood pressure of the object based on the green PPG signal and the infrared PPG signal,
wherein the light source is provided separately from the image sensor,
wherein the image sensor is further configured to output a horizontal synchronization (H-sync) signal that alternates between a high state and a low state upon a completion of a read-out operation of each pixel row, and
wherein, based on the H-sync signal provided from the light source to the light source controller, the light source controller is further configured to alternate on and off states of the green light emitter and the infrared light emitter every occurrence of a predetermined number of consecutive high states of the H-sync signal.
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