OPTICAL NAVIGATION DEVICE AND FAILURE IDENTIFICATION METHOD THEREOF
First Claim
Patent Images
1. An optical navigation device, comprising:
- an image sensor configured to successively output image frames; and
a navigation processor configured toupdate a transition noise map according to a first ratio of the transition noise map and a second ratio of a current frame,generate a fixed noise map when an update count reaches a counting threshold, andgenerate an alert signal when a feature value of the fixed noise map exceeds a feature threshold.
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Abstract
There is provided a failure identification method of an optical navigation device including the steps of: constructing a fixed noise map according to image frames captured by an image sensor; calculating a feature value of the fixed noise map; identifying whether the fixed noise map is uniform or not according to the feature value; and generating an alert signal when the fixed noise map is non-uniform for indicating failure of the optical navigation device.
9 Citations
20 Claims
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1. An optical navigation device, comprising:
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an image sensor configured to successively output image frames; and a navigation processor configured to update a transition noise map according to a first ratio of the transition noise map and a second ratio of a current frame, generate a fixed noise map when an update count reaches a counting threshold, and generate an alert signal when a feature value of the fixed noise map exceeds a feature threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A failure identification method of an optical navigation device, comprising:
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identifying whether a movement occurs; updating a transition noise map according to a first ratio of the transition noise map and a second ratio of a current frame when the movement occurs; generating a fixed noise map when an update count reaches a counting threshold; and generating an alert signal indicating failure of the optical navigation device when a feature value of the fixed noise map exceeds a feature threshold. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A failure identification method of an optical navigation device, comprising:
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constructing a fixed noise map according to image frames captured by an image sensor; calculating a feature value of the fixed noise map; identifying whether the fixed noise map is uniform or non-uniform according to the feature value; and generating an alert signal indicating failure of the optical navigation device when the fixed noise map is non-uniform. - View Dependent Claims (17, 18, 19, 20)
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Specification