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US6441867B1
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Bit-depth extension of digital displays using noise
Assignee: Sharp Laboratories of America Inc
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Filing: 1999-10-22
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Granted: 2002-08-27
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Expires: 2019-10-22
Abstract
Abstract A method for extending bit-depth of display systems. The method includes the steps of measuring the static display noise of a display device, using the display noise to create pseudo-random noise and subtracting the pseudorandom noise from a contone image. After the noise-compensated image data is quantized and displayed, the noise in the display device will substantially convert the noise-compensated image data back to contone image data with few or no contouring artifacts. Other embodiments include using the inherent noise of the human visual system instead of the static display noise, or both. Specific adjustments can be made to the noise of the human visual system for color displays.
Inventors
- 👤 Scott Daly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:09
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N1/00; H04N1/46; H04N1/56; H04N1/58; G; G06; G06T; G06T5/00; G09; G09G; G09G3/00; G09G3/20; G09G3/2007; G09G3/2044; G09G3/2048; G09G5/00; H04N5/00; H04N5/14; H04N5/21; G06T2207/00; G06T2207/10; G06T2207/10024; H04N19/00; H04N19/90
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
76 words
A method for extending bit-depth of display systems, comprising the steps of: a) measuring static display noise of a display device; b) creating pseudo-random noise using the static display noise of a display device; c) subtracting the pseudo-random noise from image data, thereby producing noise-compensated image data; d) quantizing the noise-compensated image data; and e) displaying the noise-compensated image data, whereby the noise-compensated image data is substantially converted back to image data at the display device.
Claim 2
Independent Claim
76 words
A method for extending bit-depth of display systems, comprising the steps of: a) measuring static display noise of a display device; b) creating pseudo-random noise using the static display noise of a display device; c) subtracting the pseudo-random noise from image data, thereby producing noise-compensated image data; d) quantizing the noise-compensated image data; and e) displaying the noise-compensated image data, whereby the noise-compensated image data is substantially converted back to image data at the display device.
Claim 3
Dependent Claim
30 words
The method of claim 1 wherein the creating pseudo-random noise step further comprises determining human visual system noise and combining the human visual system noise with the static display noise.
Claim 4
Independent Claim
73 words
A method for extending bit-depth of display systems, comprising the steps of: a) determining human visual system noise; b) creating pseudo-random noise from the human visual system noise; c) subtracting the pseudo-random noise from image data, thereby producing noise-compensated image data; d) quantizing the noise-compensated image data; and e) displaying the noise-compensated image data, whereby the noise-compensated image data is at least partially converted back to image data by a human visual system.
Claim 5
Independent Claim
73 words
A method for extending bit-depth of display systems, comprising the steps of: a) determining human visual system noise; b) creating pseudo-random noise from the human visual system noise; c) subtracting the pseudo-random noise from image data, thereby producing noise-compensated image data; d) quantizing the noise-compensated image data; and e) displaying the noise-compensated image data, whereby the noise-compensated image data is at least partially converted back to image data by a human visual system.
Claim 6
Dependent Claim
21 words
The method as claimed in claim 3 , wherein an achromatic model is used for determining the human visual system noise.
Claim 7
Dependent Claim
18 words
The method as claimed in claim 4 , wherein one noise field is added to each color plane.
Claim 8
Dependent Claim
20 words
The method as claimed in claim 4 , wherein the noise field is spatially offset differently for each color plane.
Claim 9
Dependent Claim
21 words
The method as claimed in claim 3 , wherein a chromatic model is used for determining the human visual system noise.
Claim 10
Dependent Claim
19 words
The method as claimed in claim 7 , wherein a different noise field is generated for each color plane.
Claim 11
Dependent Claim
20 words
The method as claimed in claim 7 , wherein noise is added prior to conversion from opponent color to RGB.
Claim 12
Dependent Claim
34 words
The method of claim 3 , wherein the creating pseudo-random noise step further comprises measuring static display noise of a display device and combining the static display noise with the human visual system noise.
Claim 13
Independent Claim
71 words
A method for extending bit-depth of display system, comprising the steps of: a) determining human visual system noise; b) measuring static noise of a display device; c) combining the human visual system noise and the static noise of a display device to create pseudo-random noise; d) subtracting the pseudo-random noise from image data, thereby producing noise-compensated image data; e) quantizing the noise-compensated image data; and f) displaying the noise-compensated image data.
Claim 14
Independent Claim
71 words
A method for extending bit-depth of display system, comprising the steps of: a) determining human visual system noise; b) measuring static noise of a display device; c) combining the human visual system noise and the static noise of a display device to create pseudo-random noise; d) subtracting the pseudo-random noise from image data, thereby producing noise-compensated image data; e) quantizing the noise-compensated image data; and f) displaying the noise-compensated image data.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-08-26 | 2006-02-25 | 2006-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-08-26 | 2010-02-25 | 2010-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-08-26 | 2014-02-25 | 2014-08-27 | $7700.00 | Window Closed / Lapsed |