Optical distance measurement system and operation method thereof
First Claim
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1. An optical distance measurement system configured to detect a finger distance of a finger of a user from the optical distance measurement system and a physiological characteristic of the user, the optical distance measurement system comprising:
- a first light source configured to provide light of a first wavelength to the finger;
a second light source configured to provide light of a second wavelength to the finger;
a light control unit configured to control on-states of the first light source and the second light source;
an image sensor configured to receive reflected light from the finger at a sampling frequency to generate a plurality of first image frames corresponding to the on-states of the first light source and a plurality of second image frames corresponding to the on-states of the second light source; and
a processing unit configured tocalculate the finger distance and a finger motion of the finger according to the first image frames or the second image frames, andcalculate the physiological characteristic according to the first image frames and the second image frames when the finger distance is within a predetermined range, whereinthe finger motion is not calculated when the finger distance is within the predetermined range.
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Abstract
There is provided an operation method of an optical distance measurement system including a first mode and a second mode. The first mode is configured to detect a finger distance. The second mode is configured to detect a physiological characteristic, wherein the optical distance measurement system transfers from the first mode to the second mode when the finger distance is within a predetermined range. There is further provided an optical distance measurement system.
15 Citations
21 Claims
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1. An optical distance measurement system configured to detect a finger distance of a finger of a user from the optical distance measurement system and a physiological characteristic of the user, the optical distance measurement system comprising:
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a first light source configured to provide light of a first wavelength to the finger; a second light source configured to provide light of a second wavelength to the finger; a light control unit configured to control on-states of the first light source and the second light source; an image sensor configured to receive reflected light from the finger at a sampling frequency to generate a plurality of first image frames corresponding to the on-states of the first light source and a plurality of second image frames corresponding to the on-states of the second light source; and a processing unit configured to calculate the finger distance and a finger motion of the finger according to the first image frames or the second image frames, and calculate the physiological characteristic according to the first image frames and the second image frames when the finger distance is within a predetermined range, wherein the finger motion is not calculated when the finger distance is within the predetermined range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An operation method of an optical distance measurement system, comprising:
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detecting a finger distance of a finger of a user from the optical distance measurement system and a finger motion of the finger in a first mode; and detecting a physiological characteristic of the user in a second mode, wherein the optical distance measurement system transfers from the first mode to the second mode when the finger distance is within a predetermined range and the finger motion is not detected when the finger distance is within the predetermined range. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. An operation method of an optical distance measurement system, comprising:
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providing light of a first wavelength or a second wavelength to a finger surface of a finger; receiving reflected light of the first wavelength or the second wavelength to generate a plurality of image frames; calculating a finger distance of the finger from the optical distance measurement system according to an intensity distribution of the image frames; and performing the following steps when the finger distance is within a predetermined range; providing light of the first wavelength and the second wavelength to the finger surface; receiving, by an image sensor, reflected light of the first wavelength to generate a plurality of first image frames and receiving reflected light of the second wavelength to generate a plurality of second image frames; dividing each of the first image frames and each of the second image frames into at least two parts and calculating an average brightness of each part; analyzing the average brightness of the each part of the first image frames to obtain a first intensity variation and analyzing the average brightness of the each part of the second image frames to obtain a second intensity variation; and calculating a blood oxygenation according to the first intensity variation and the second intensity variation. - View Dependent Claims (19, 20, 21)
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Specification