Determination of a navigation window in an optical navigation system
First Claim
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1. An optical navigation method comprising:
- establishing a threshold;
obtaining image data;
summing the image data on a per-slice basis to create per-slice sums;
comparing the per-slice sums to the threshold; and
defining a boundary of a navigation window in response to the comparison.
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Abstract
A technique for reducing navigation errors that are caused by uneven illumination involves using only the portion of the image data that is properly illuminated in the correlation process. The portion of the image data that is used for optical navigation is established by summing the image data on a per-slice basis, comparing the per-slice sums to a pre-established intensity threshold, and defining boundaries of the navigation window in response to the comparison. Boundaries are set at the points where the per-slice sums equal the pre-established intensity threshold.
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Citations
20 Claims
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1. An optical navigation method comprising:
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establishing a threshold;
obtaining image data;
summing the image data on a per-slice basis to create per-slice sums;
comparing the per-slice sums to the threshold; and
defining a boundary of a navigation window in response to the comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 12)
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10. An optical navigation method comprising:
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obtaining image data;
summing the image data on a per-column basis and on a per-row basis; and
defining boundaries of a navigation window in response to the summing. - View Dependent Claims (11, 13, 14, 15, 16)
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17. A system for processing image data for optical navigation comprising:
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an image sensor configured to obtain image data;
pre-processing logic configured to sum intensity values of first image data on a per-column basis and on a per-row basis; and
boundary logic configured to define boundaries of a navigation window in response to the per-column and per-row sums. - View Dependent Claims (18, 19, 20)
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Specification