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US 10,082,883 B2Granted
Optical navigation device and locus smoothing method thereof
AssigneePixart Imaging Inc.
InventorsYu-Hao Huang, Ming-Tsan Kao, Sen-Huang Huang
Life of this patent
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Abstract
There is provided an optical navigation device including an image sensor, a processing unit, a storage unit and an output unit. The image sensor is configured to successively capture images. The processing unit is configured to calculate a current displacement according to the images and to compare the current displacement or an accumulated displacement with a threshold so as to determine an outputted displacement. The storage unit is configured to save the accumulated displacement. The output unit is configured to output the outputted displacement with a report rate.
Claims16
An optical navigation device, comprising:
- an image sensor configured to successively capture images;
- an output unit;
- a processing unit coupled to the output unit and configured to
- calculate a current displacement according to the images and to compare the current displacement with a threshold;
- when the current displacement is smaller than the threshold, output a zero displacement to an external electronic device via the output unit and accumulate the current displacement to an accumulated displacement;
- and
- when the current displacement is larger than or equal to the threshold, output the current displacement without accumulating the current displacement to the accumulated displacement;
- and
- a counting unit configured to count an accumulated number which is a number of times the current displacement is accumulated to the accumulated displacement,
- wherein the accumulated number is increased by 1 as long as one current displacement is accumulated to the accumulated displacement and the accumulated number is not increased when no current displacement is accumulated to the accumulated displacement.
7 more elements
A locus smoothing method of an optical navigation device, comprising:
- successively capturing images with an image sensor of the optical navigation device;
- calculating, using a processing unit of the optical navigation device, a current displacement according to the images;
- comparing, using the processing unit, the current displacement with a threshold;
- when the current displacement is smaller than the threshold,
- calculating, using the processing unit, a next current displacement, and
- directly accumulating the next current displacement to an accumulated displacement without comparing the next current displacement with the threshold;
- outputting the accumulated displacement to an external electronic device via an output unit when the accumulated displacement is larger than or equal to the threshold;
- outputting a zero displacement to the external electronic device via the output unit when the accumulated displacement is smaller than the threshold;
- and
- counting, with a counting unit of the optical navigation device, an accumulated number which is a number of times the current displacement is accumulated to the accumulated displacement,
- wherein the accumulated number is increased by 1 as long as one current displacement is accumulated to the accumulated displacement and the accumulated number is not increased when no current displacement is accumulated to the accumulated displacement.
8 more elements
A locus smoothing method of an optical navigation device, comprising:
- successively capturing images with an image sensor of the optical navigation device;
- calculating, using a processing unit of the optical navigation device, a current displacement according to the images;
- comparing, using the processing unit, the current displacement with a threshold;
- outputting the current displacement when the current displacement is larger than or equal to the threshold without accumulating the current displacement to an accumulated displacement;
- accumulating the current displacement to the accumulated displacement and outputting a zero displacement to an external electronic device via an output unit when the current displacement is smaller than the threshold, and
- counting, with a counting unit of the optical navigation device, an accumulated number which is a number of times the current displacement is accumulated to the accumulated displacement,
- wherein the accumulated number is increased by 1 as long as one current displacement is accumulated to the accumulated displacement and the accumulated number is not increased when no current displacement is accumulated to the accumulated displacement.
4 more elements
Dependencies are inferred from the claim text.