US7102669B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital color image pre-processing
Assignee: NXP USA Inc
•
Filing: 2002-04-02
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Granted: 2006-09-05
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Expires: 2022-04-02
Abstract
Abstract In one embodiment, the invention involves a method for processing an image. A sensor output is provided. An automatic gain control of the sensor output is performed to generate a first output. An automatic white balance correction to the first output is performed to generate a second output. A gamma correction of the second output is performed to generate a third output. A color interpolation is performed to the third output to generate a fourth output. A low-pass spatial filtration of the fourth output is performed to generate a fifth output. A color saturation and correction of the fifth output is performed to generate a sixth output, and a high-pass spatial filtration of the sixth output is performed to generate an image output.
Inventors
- 👤 Michael Skow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:13
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/70; H04N23/80; H04N23/84; H04N23/843; H04N2209/00; H04N2209/04; H04N2209/041; H04N2209/042; H04N2209/045; H04N2209/046
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
171 words
A method for processing an image, comprising: providing a sensor output; performing an automatic gain control of the sensor output to generate a first output, wherein the automatic gain control is applied in a digital domain, including performing an expansion of a histogram to fill a dynamic range; performing an automatic white balance correction to the first output to generate a second output; performing a gamma correction of the second output to generate a third output, wherein the gamma correction performs a variable gamma correction to increase a dynamic range of an image included in the second output; performing a color interpolation to the third output to generate a fourth output; performing a low-pass spatial filtration of the fourth output to generate a fifth output, wherein the low-pass spatial filtration is for eliminating a fixed pattern noise in a flat field; performing a color saturation and correction of the fifth output to generate a sixth output; and performing a high-pass spatial filtration of the sixth output to generate an image output.
Claim 2
Independent Claim
171 words
A method for processing an image, comprising: providing a sensor output; performing an automatic gain control of the sensor output to generate a first output, wherein the automatic gain control is applied in a digital domain, including performing an expansion of a histogram to fill a dynamic range; performing an automatic white balance correction to the first output to generate a second output; performing a gamma correction of the second output to generate a third output, wherein the gamma correction performs a variable gamma correction to increase a dynamic range of an image included in the second output; performing a color interpolation to the third output to generate a fourth output; performing a low-pass spatial filtration of the fourth output to generate a fifth output, wherein the low-pass spatial filtration is for eliminating a fixed pattern noise in a flat field; performing a color saturation and correction of the fifth output to generate a sixth output; and performing a high-pass spatial filtration of the sixth output to generate an image output.
Claim 3
Dependent Claim
34 words
The method of claim 1 , wherein the automatic white balance correction comprises calculating a gray world model ratio of a set of colors in a pattern and applying a multiplier to each color.
Claim 4
Dependent Claim
15 words
The method of claim 1 , wherein the gamma correction is performed in gray space.
Claim 5
Dependent Claim
26 words
The method of claim 1 , wherein the color interpolation comprises performing a three-by-three edge enhanced demosaic of a raw Bayer signal to an RGB signal.
Claim 6
Dependent Claim
25 words
The method of claim 1 , wherein the low-pass spatial filtration comprises performing a low-pass spatial filter on each of a plurality of color planes.
Claim 7
Dependent Claim
29 words
The method of claim 1 , wherein the color saturation and correction comprises manipulating color ratios of a plurality of color planes within each of a plurality of pixels.
Claim 8
Dependent Claim
16 words
The method of claim 1 , wherein the high-pass spatial filtration comprises enhancing a spatial edge.
Claim 9
Dependent Claim
12 words
An imaging device configured to implement the method of claim 1 .
Claim 10
Dependent Claim
14 words
An application specific integrated circuit configured to implement the method of claim 1 .
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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) | 2009-09-04 | 2010-03-06 | 2010-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2013-09-04 | 2014-03-06 | 2014-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2017-09-04 | 2018-03-06 | 2018-09-05 | $7700.00 | Window Closed / Lapsed |