Optical navigation device and locus smoothing method thereof
AssigneePixart Imaging Inc.
InventorsYu-Hao Huang, Ming-Tsan Kao, Sen-Huang Huang
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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.
Claims20
An optical navigation device configured to be coupled to an external electronic device, the optical navigation device comprising:
- an image sensor configured to successively capture images;
- an output unit;
- and
- a processing unit coupled to the output unit and configured to
- calculate a current displacement according to the captured images and compare the current displacement with a threshold,
- when the current displacement is smaller than the threshold, output a zero displacement to the 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.
A locus smoothing method of an optical navigation device for smoothing displacements sent to an external electronic device, the optical navigation device comprising an image sensor, an output unit and a processing unit, the locus smoothing method comprising:
- successively capturing, by the image sensor, images;
- calculating, by the processing unit, a current displacement according to the captured images;
- comparing, by the processing unit, the current displacement with a threshold;
- when the current displacement is smaller than the threshold,
- accumulating the current displacement to an accumulated displacement,
- calculating, by the processing unit, a next current displacement, and
- directly accumulating the next current displacement to the accumulated displacement;
- outputting the accumulated displacement to the external electronic device via the output unit when the accumulated displacement is larger than or equal to the threshold;
- and
- outputting a zero displacement to the external electronic device via the output unit when the accumulated displacement is smaller than the threshold.
A locus smoothing method of an optical navigation device for smoothing displacements sent to an external electronic device, the optical navigation device comprising an image sensor, an output unit and a processing unit, the locus smoothing method comprising:
- successively capturing, by the image sensor, images;
- calculating, by the processing unit, a current displacement according to the captured images;
- comparing, by 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;
- and
- accumulating the current displacement to the accumulated displacement and outputting a zero displacement to the external electronic device via the output unit when the current displacement is smaller than the threshold.
Dependencies are inferred from the claim text.