Apparatus for controlling the position of a screen pointer with low sensitivity to fixed pattern noise
First Claim
1. An apparatus for controlling the position of a screen pointer, the apparatus comprising:
- a light source configured to illuminate an imaging surface to thereby generate reflected images; and
a navigation sensor configured to generate digital images based on the reflected images to perform a movement computation based on the digital images, and to generate movement data based on the movement computation that is indicative of relative motion between the imaging surface and the apparatus, wherein the movement computation includes attenuating fixed pattern noise in the digital images.
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Abstract
An apparatus for controlling the position of a screen pointer includes an at least partially coherent light source for illuminating an imaging surface, thereby generating reflected images. The apparatus includes a navigation sensor for generating digital images based on the reflected images, performing a movement computation based on the digital images, generating movement data based on the movement computation that is indicative of relative motion between the imaging surface and the apparatus, wherein the movement computation includes attenuating fixed pattern noise in the digital images.
66 Citations
20 Claims
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1. An apparatus for controlling the position of a screen pointer, the apparatus comprising:
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a light source configured to illuminate an imaging surface to thereby generate reflected images; and
a navigation sensor configured to generate digital images based on the reflected images to perform a movement computation based on the digital images, and to generate movement data based on the movement computation that is indicative of relative motion between the imaging surface and the apparatus, wherein the movement computation includes attenuating fixed pattern noise in the digital images. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of generating movement data with an optical pointing device, the method comprising:
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illuminating an imaging surface with an at least partially coherent light source, thereby generating reflected images;
generating digital images based on the reflected images; and
generating movement data based on the digital images including performing movement calculations that attenuate fixed pattern noise in the digital images. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A navigation sensor for generating movement data to control the position of a screen pointer, the navigation sensor comprising:
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a sensor array configured to sense reflected images from an imaging surface produced by a light source;
an analog to digital converter configured to generate digital images based on outputs of the sensor array; and
a processor configured to generate movement data based on the digital images, wherein the movement data is generated based on movement calculations that have a low sensitivity to effects in the digital images caused by fixed pattern noise.
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Specification