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 and a physiological characteristic, the optical distance measurement system comprising:
- a first light source providing light of a first wavelength to a finger;
a second light source providing 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 receiving 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 according to the first image frames or the second image frames and to calculate the physiological characteristic according to the first image frames and the second image frames when the finger distance is within a 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.
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Citations
21 Claims
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1. An optical distance measurement system configured to detect a finger distance and a physiological characteristic, the optical distance measurement system comprising:
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a first light source providing light of a first wavelength to a finger; a second light source providing 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 receiving 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 according to the first image frames or the second image frames and to calculate the physiological characteristic according to the first image frames and the second image frames when the finger distance is within a 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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a first mode configured to detect a finger distance; and a second mode 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. - 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; receiving reflected light of the first wavelength or the second wavelength to generate a plurality of image frames; calculating a finger distance according to an intensity distribution of the image frames; and performing 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; using an image sensor to receive reflected light of the first wavelength to generate a plurality of first image frames and to receive 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