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Optical navigation device and locus smoothing method thereof

Inactive Publication Date: 2013-11-07
PIXART IMAGING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

The patent text describes an optical navigation device and a method for smoothing its locus to reduce noise interference. The device can output a zero displacement when the accumulated displacement does not exceed a certain threshold or when the accumulated parameter does not exceed a predetermined value. This helps to eliminate any noise interference and ensures accurate navigation.

Problems solved by technology

However, as the image frames captured by the image sensor may contain noise, the noise will reflect in the displacement calculated by the processing unit.
This zigzag locus can significantly affect the operation of a user in fine operation.

Method used

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  • Optical navigation device and locus smoothing method thereof
  • Optical navigation device and locus smoothing method thereof
  • Optical navigation device and locus smoothing method thereof

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Embodiment Construction

[0021]It should be noted that, wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

[0022]Referring to FIGS. 2A and 2B, FIG. 2A shows a schematic diagram of the optical navigation device according to an embodiment of the present disclosure; and FIG. 2B shows a schematic block diagram of the optical navigation device according to an embodiment of the present disclosure.

[0023]The optical navigation device 1 includes a housing 10, a light source11, an image sensor 12, a processing unit 13, an output unit 14, a counting unit 15 and a storage unit 16. In one embodiment, the optical navigation device 1 may further include a light control unit 17 configured to control the turning on and the turning off of the light source 11, and the light control unit 17 may be included in the processing unit 13 or separated therefrom. The optical navigation device 1 is configured to be put on a working surface S for being operated by a user...

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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.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application claims the priority benefit of Taiwan Patent Application Serial Number 101115438, filed on May 1, 2012, the full disclosure of which is incorporated herein by reference.BACKGROUND[0002]1. Field of the Disclosure[0003]This disclosure generally relates to a human machine interface device and, more particularly, to an optical navigation device and a locus smoothing method thereof capable of increasing locus smoothness.[0004]2. Description of the Related Art[0005]Traditionally, the optical mouse is one of the peripheral devices for interacting with the computer system having a display screen. An optical mouse generally includes a light source, an image sensor and a processing unit. The light source emits light to a working surface. The image sensor receives reflected light from the working surface and successively outputs image frames. The processing unit calculates a displacement of the optical mouse with respect to the worki...

Claims

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Application Information

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IPC IPC(8): G06F3/0354
CPCG06F3/03543G06F3/0317G06F3/038G06F3/027G06F3/0304G06F3/03541
Inventor HAUNG, YU-HAOKAO, MING-TSANHAUNG, SEN-HUANG
Owner PIXART IMAGING INC
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