Click-event detection device
First Claim
1. A click-event detection device, configured to detect a click-event of a finger, the click-event detection device comprising:
- a light source configured to illuminate the finger;
a light control unit configured to control the light source to illuminate with a first brightness value and a second brightness value;
an image sensor configured to receive reflected light from the finger at a sampling frequency to output bright image frames corresponding to the first brightness value and to output dark image frames corresponding to the second brightness value; and
a processing unit configured to calculate a plurality of differential image characteristics according to the bright image frames and the dark image frames,wherein the processing unit is configured to identify a single-click when following two conditions are satisfied sequentially;
(1) a first variation of the differential image characteristics is larger than a first varying threshold within a first time interval; and
(2) a second variation of the differential image characteristics is smaller than or equal to a second varying threshold within a second time interval, andwherein the processing unit is configured to identify a double-click when following four conditions are satisfied sequentially;
(1) the first variation of the differential image characteristics is larger than the first varying threshold within the first time interval;
(2) the second variation of the differential image characteristics is smaller than or equal to the second varying threshold within the second time interval;
(3) a third variation of the differential image characteristics is larger than the first varying threshold within a third time interval; and
(4) a fourth variation of the differential image characteristics is smaller than or equal to the second varying threshold within a fourth time interval.
1 Assignment
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Accused Products
Abstract
There is provided a click-event detection device including a light source, a light control unit, an image sensor and a processing unit. The light control unit is configured to control the light source to illuminate a finger. The image sensor receives reflected light from the finger to accordingly output a plurality of bright image frames and dark image frames. The processing unit is configured to calculate a differential image characteristic between the bright image frames and the dark image frames, to determine a plurality of operating states according to the differential image characteristic, to count a residence time at each of the operating states, and to identify a click-event according to the operating states and the residence time.
6 Citations
19 Claims
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1. A click-event detection device, configured to detect a click-event of a finger, the click-event detection device comprising:
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a light source configured to illuminate the finger; a light control unit configured to control the light source to illuminate with a first brightness value and a second brightness value; an image sensor configured to receive reflected light from the finger at a sampling frequency to output bright image frames corresponding to the first brightness value and to output dark image frames corresponding to the second brightness value; and a processing unit configured to calculate a plurality of differential image characteristics according to the bright image frames and the dark image frames, wherein the processing unit is configured to identify a single-click when following two conditions are satisfied sequentially;
(1) a first variation of the differential image characteristics is larger than a first varying threshold within a first time interval; and
(2) a second variation of the differential image characteristics is smaller than or equal to a second varying threshold within a second time interval, andwherein the processing unit is configured to identify a double-click when following four conditions are satisfied sequentially;
(1) the first variation of the differential image characteristics is larger than the first varying threshold within the first time interval;
(2) the second variation of the differential image characteristics is smaller than or equal to the second varying threshold within the second time interval;
(3) a third variation of the differential image characteristics is larger than the first varying threshold within a third time interval; and
(4) a fourth variation of the differential image characteristics is smaller than or equal to the second varying threshold within a fourth time interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A click-event detection device, configured to detect a click-event of a finger, the click-event detection device comprising:
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a light source configured to illuminate the finger; a light control unit configured to control the light source to illuminate with a first brightness value and a second brightness value; an image sensor configured to receive reflected light from the finger at a sampling frequency to output bright image frames corresponding to the first brightness value and to output dark image frames corresponding to the second brightness value; and a processing unit configured to calculate a plurality of differential image characteristics according to the bright image frames and the dark image frames, wherein the processing unit is configured to identify a single-click when following two conditions are satisfied sequentially;
(1) a first value of the differential image characteristics is larger than a first threshold within a first time interval; and
(2) a second value of the differential image characteristics is smaller than or equal to a second threshold within a second time interval, andwherein the processing unit is configured to calculate a double-click when following four conditions are satisfied sequentially;
(1) the first value of the differential image characteristics is larger than the first threshold within the first time interval;
(2) the second value of the differential image characteristics is smaller than or equal to the second threshold within the second time interval;
(3) a third value of the differential image characteristics is larger than the first threshold within a third time interval; and
(4) a fourth value of the differential image characteristics is smaller than or equal to the second threshold with a fourth time interval. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A click-event detection device, configured to detect a click-event of a finger, the click-event detection device comprising:
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a light source configured to illuminate the finger; a light control unit configured to control the light source to illuminate with a first brightness value and a second brightness value; an image sensor configured to receive reflected light from the finger to output bright image frames corresponding to the first brightness value and to output dark image frames corresponding to the second brightness value; and a processing unit configured to calculate a plurality of differential image characteristics according to the bright image frames and the dark image frames, wherein the processing unit is configured to identify a double-click when following four conditions are satisfied sequentially;
(1) a first variation of the differential image characteristics is larger than a first varying threshold within a first time interval;
(2) a second variation of the differential image characteristics is smaller than or equal to a second varying threshold within a second time interval;
(3) a third variation of the differential image characteristics is larger than the first varying threshold within a third time interval; and
(4) a fourth variation of the differential image characteristics is smaller than or equal to the second varying threshold within a fourth time interval. - View Dependent Claims (18, 19)
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Specification