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US6453075B1
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Method for preserving image detail when adjusting the tone scale of a digital color image
Assignee: Monument Peak Ventures LLC
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Filing: 1998-12-31
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Granted: 2002-09-17
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Expires: 2018-12-31
Abstract
Abstract A method for preserving spatial detail when adjusting the tone scale of a digital color image, the method comprises receiving a digital color image; providing a tone scale function for adjusting the tone scale of the digital color image; generating a luminance signal from the digital color image; using the tone scale function and the control signal applied to each color channel of the digital color image to produce an enhanced digital color image.
Inventors
- 👤 Andrew C. Gallagher
- 👤 Edward B. Gindele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:30
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/58; H04N1/60; H04N1/6027
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
142 words
A method for preserving detail when adjusting tone scale of a digital color image, the method comprising: (a) receiving a digital color image having at least two color channels; (b) providing a tone scale function for adjusting the tone scale of the digital color image; (c) generating a luminance signal from the digital color image; (d) generating a control signal from a spatially filtered version of the luminance signal; and (e) using the tone scale function and the control signal applied to each color channel of the digital color image to produce an enhanced digital color image, wherein a high pass and low pass signal are generated for each color channel and at least two non-linear spatial filtered versions of each color channel are generated from the high pass signal, the low pass signal, the control signal, and the original color channels.
Claim 2
Independent Claim
142 words
A method for preserving detail when adjusting tone scale of a digital color image, the method comprising: (a) receiving a digital color image having at least two color channels; (b) providing a tone scale function for adjusting the tone scale of the digital color image; (c) generating a luminance signal from the digital color image; (d) generating a control signal from a spatially filtered version of the luminance signal; and (e) using the tone scale function and the control signal applied to each color channel of the digital color image to produce an enhanced digital color image, wherein a high pass and low pass signal are generated for each color channel and at least two non-linear spatial filtered versions of each color channel are generated from the high pass signal, the low pass signal, the control signal, and the original color channels.
Claim 3
Dependent Claim
36 words
The method as in claim 1 , wherein step (e) further includes generating enhanced color channels by the application of the tone scale function to one of the non-linear spatial filtered versions of each color channel.
Claim 4
Dependent Claim
19 words
The method as in claim 2 , wherein step (e) further includes modifying the remaining non-linear spatial filtered signals.
Claim 5
Independent Claim
146 words
A method for preserving detail when adjusting tone scale of a digital color image, the method comprising: (a) receiving a digital color image having at least two color channels; (b) providing a plurality of tone scale functions, one for each color channel, for adjusting the tone scale of the digital color image; (c) generating a luminance signal from the digital color image; (d) generating a control signal derived from the luminance signal; and (e) respectively applying each tone scale function and the control signal to the respective color channel of the digital color image to produce an enhanced digital color image, wherein a high pass and low pass signal are generated for each color channel and at least two non-linear spatial filtered versions of each color channel are generated from the high pass signal, the low pass signal, the control signal, and the original color channels.
Claim 6
Independent Claim
146 words
A method for preserving detail when adjusting tone scale of a digital color image, the method comprising: (a) receiving a digital color image having at least two color channels; (b) providing a plurality of tone scale functions, one for each color channel, for adjusting the tone scale of the digital color image; (c) generating a luminance signal from the digital color image; (d) generating a control signal derived from the luminance signal; and (e) respectively applying each tone scale function and the control signal to the respective color channel of the digital color image to produce an enhanced digital color image, wherein a high pass and low pass signal are generated for each color channel and at least two non-linear spatial filtered versions of each color channel are generated from the high pass signal, the low pass signal, the control signal, and the original color channels.
Claim 7
Dependent Claim
37 words
The method as in claim 4 , wherein step (e) further includes generating enhanced color channels by the application of the respective tone scale functions to one of the non-linear spatial filtered versions of each color channel.
Claim 8
Dependent Claim
19 words
The method as in claim 5 , wherein step (e) further includes modifying the remaining non-linear spatial filtered signals.
References Cited (Backward Citations)
US5012333A
Cited
EP0415648A2
Cited
US5454044A
Cited
US5172224A
Cited
EP0525949A2
Cited
DE4126751A1
Cited
JPH0630330A
Cited
EP0613294A1
Cited
US5793885A
Cited
EP0849940A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-09-16 | 2006-03-18 | 2006-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-09-16 | 2010-03-18 | 2010-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-09-16 | 2014-03-18 | 2014-09-17 | $7700.00 | Window Closed / Lapsed |