US5835618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Uniform and non-uniform dynamic range remapping for optimum image display
Assignee: Siemens Corp
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Filing: 1996-09-27
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Granted: 1998-11-10
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Expires: 2016-09-27
Abstract
Abstract A contexture dependent dynamic range remapping system utilizes background estimation, mask generation, parameter estimation and dynamic range remapping of an original image to provide an optimum output image. The dynamic range remapping includes an additive algorithm or a multiplicative algorithm or a combination of both algorithms. The output from the algorithms could be filtered by an edge-preserving filter to provide a filtered output image. The system adaptively compresses the dynamic range of the DC and slow-varying signals in the original image significantly while preserving and enhancing fine structures.
Inventors
- 👤 Ming Fang
- 👤 Jianzhong Qian
- 👤 Helmuth Schramm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:50
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/407; H04N1/4072; G; G06; G06T; G06T5/00; G06T5/40; G06T5/90; G06T5/92; G06T2207/00; G06T2207/20; G06T2207/20172; G06T2207/20192; G06T2207/30; G06T2207/30004
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
103 words
A uniform and non-uniform dynamic range remapping system for optimum image display comprising: background estimation means for receiving an original image and for providing an estimated background image; mask generation means for receiving an original image; parameter estimation means for receiving an original image; and, dynamic range remapping means connected to said background estimation means, said mask generation means and said parameter estimation means for transmitting an output image; wherein said dynamic range remapping means comprises: additive algorithm means; and means for using a minimum and maximum value of said original image to remap dynamic range of processed image to said original image.
Claim 2
Dependent Claim
103 words
A uniform and non-uniform dynamic range remapping system for optimum image display comprising: background estimation means for receiving an original image and for providing an estimated background image; mask generation means for receiving an original image; parameter estimation means for receiving an original image; and, dynamic range remapping means connected to said background estimation means, said mask generation means and said parameter estimation means for transmitting an output image; wherein said dynamic range remapping means comprises: additive algorithm means; and means for using a minimum and maximum value of said original image to remap dynamic range of processed image to said original image.
Claim 3
Dependent Claim
30 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 1 further comprising: edge preserving filter means connected to said dynamic range remapping means.
Claim 4
Dependent Claim
42 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 1 wherein: output of said dynamic range remapping means is fed back into said background estimation means, said mask generation means and said parameter estimation means.
Claim 5
Dependent Claim
42 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 1 wherein said background estimation means comprises: filter means for estimating DC and slow-varying signal components from said original image therefore providing said estimated background image.
Claim 6
Dependent Claim
36 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 1 wherein said mask generation means comprises: means for compressing DC and slow-varying signals for providing a binary mask image.
Claim 7
Dependent Claim
43 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 1 wherein said mask generation means comprises: means for subtracting said original image by a portion of said estimated background image for providing a binary mask image.
Claim 8
Dependent Claim
43 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 1 wherein said mask generation means comprises: means for dividing said original image by a portion of said estimated background image for providing a binary mask image.
Claim 9
Dependent Claim
39 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 1 wherein said parameter estimation means comprises: means for computing image parameters such as mean, maximum and minimum values from said original image.
Claim 10
Dependent Claim
38 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 1 wherein said dynamic range remapping means further comprises: fusion means for fusing said remapped images together to form said output image.
Claim 11
Dependent Claim
39 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 1 wherein: said dynamic range remapping means takes out DC and slow-varying signal components from said original image independent of estimated background intensity.
Claim 12
Dependent Claim
43 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 1 wherein said additive algorithm means comprises: positive threshold means for deciding if said estimated background image or said original image should be used for remapping process.
Claim 13
Dependent Claim
66 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 1 wherein: said additive algorithm means is defined by ##EQU3## where: θ(x,y) represents said original image; ν(x,y) represents a lowpass filtered image; β(x,y) represents said output image; ρ represents mean intensity value of image; <α< 1represents a user defined control parameter; and, Δ1 and Δ2 are two small positive thresholds.
Claim 14
Dependent Claim
28 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 1 wherein said dynamic range remapping means further comprises: multiplicative algorithm means.
Claim 15
Dependent Claim
30 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 13 further comprising: edge preserving filter means connected to said dynamic range remapping means.
Claim 16
Dependent Claim
42 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 13 wherein: output of said dynamic range remapping means is fed back into said background estimation means, said mask generation means and said parameter estimation means.
Claim 17
Dependent Claim
42 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 13 wherein said background estimation means comprises: filter means for estimating DC and slow-varying signal components from said original image therefore providing said estimated background image.
Claim 18
Dependent Claim
39 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 13 wherein said parameter estimation means comprises: means for computing image parameters such as mean, maximum and minimum values from said original image.
Claim 19
Dependent Claim
38 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 13 wherein said dynamic range remapping means further comprises: fusion means for fusing said remapped images together to form said output image.
Claim 20
Dependent Claim
39 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 13 wherein: said dynamic range remapping means takes out DC and slow-varying signal components from said original image independent of estimated background intensity.
Claim 21
Dependent Claim
43 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 13 wherein: said multiplicative algorithm means compresses DC and slow-varying signal components and also makes signal contrast in bright regions smaller than signal contrast in dark regions.
Claim 22
Dependent Claim
67 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 13 wherein: said multiplicative algorithm means is defined by ##EQU4## where: θ(x,y) represents said original image; v(x,y) represents a lowpass filtered image; β(x,y) represents said output image; ρ represents a mean intensity value of image; <α< 1represents a user defined control parameter; and, Δ1 and Δ2 are two small positive thresholds.
Claim 23
Dependent Claim
109 words
A uniform and non-uniform dynamic range remapping system for optimum image display comprising: a background estimator for receiving an original image and for providing an estimated background image; a mask generator connected to said background estimator for receiving said estimated background image and an original image; a parameter estimator for receiving an original image; and, a dynamic range remapper connected to said background estimator, said mask generator and said parameter estimator for transmitting an output image; wherein said dynamic range remapper comprises: an additive algorithm; and means for using a minimum and maximum value of said original image to remap dynamic range of processed image to said original image.
Claim 24
Dependent Claim
109 words
A uniform and non-uniform dynamic range remapping system for optimum image display comprising: a background estimator for receiving an original image and for providing an estimated background image; a mask generator connected to said background estimator for receiving said estimated background image and an original image; a parameter estimator for receiving an original image; and, a dynamic range remapper connected to said background estimator, said mask generator and said parameter estimator for transmitting an output image; wherein said dynamic range remapper comprises: an additive algorithm; and means for using a minimum and maximum value of said original image to remap dynamic range of processed image to said original image.
Claim 25
Dependent Claim
32 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 22 further comprising: an edge preserving filter connected to an output of said dynamic range remapper.
Claim 26
Independent Claim
94 words
A method of performing uniform and non-uniform dynamic range remapping for optimum image display comprising the steps of: estimating a background of an original image to provide an estimated background image; generating a binary mask image from said original image and said estimated background image; estimating parameters of said original image; and, remapping dynamic range therefore providing an output image; wherein remapping dynamic range comprises the steps of: utilizing a multiplicative algorithm; and using a minimum and maximum value of said original image to remap dynamic range of processed image to said original image.
Claim 27
Independent Claim
94 words
A method of performing uniform and non-uniform dynamic range remapping for optimum image display comprising the steps of: estimating a background of an original image to provide an estimated background image; generating a binary mask image from said original image and said estimated background image; estimating parameters of said original image; and, remapping dynamic range therefore providing an output image; wherein remapping dynamic range comprises the steps of: utilizing a multiplicative algorithm; and using a minimum and maximum value of said original image to remap dynamic range of processed image to said original image.
Claim 28
Dependent Claim
31 words
A method of performing uniform and non-uniform dynamic range remapping for optimum image display as claimed in claim 24 further comprising the step of: edge preserving filtering after remapping dynamic range.
Claim 29
Dependent Claim
103 words
A uniform and non-uniform dynamic range remapping system for optimum image display comprising: background estimation means for receiving an original image and for providing an estimated background image; mask generation means for receiving an original image; parameter estimation means for receiving an original image; and dynamic range remapping means connected to said background estimation means, said mask generation means and said parameter estimation means for transmitting an output image; wherein said dynamic range remapping means comprises: multiplicative algorithm means; and means for using a minimum and maximum value of said original image to remap dynamic range of processed image to said original image.
Claim 30
Dependent Claim
103 words
A uniform and non-uniform dynamic range remapping system for optimum image display comprising: background estimation means for receiving an original image and for providing an estimated background image; mask generation means for receiving an original image; parameter estimation means for receiving an original image; and dynamic range remapping means connected to said background estimation means, said mask generation means and said parameter estimation means for transmitting an output image; wherein said dynamic range remapping means comprises: multiplicative algorithm means; and means for using a minimum and maximum value of said original image to remap dynamic range of processed image to said original image.
Claim 31
Dependent Claim
30 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 26 further comprising: edge preserving filter means connected to said dynamic range remapping means.
Claim 32
Dependent Claim
42 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 26 wherein: output of said dynamic range remapping means is fed back into said background estimation means, said mask generation means and said parameter estimation means.
Claim 33
Dependent Claim
42 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 26 wherein said background estimation means comprises: filter means for estimating DC and slow-varying signal components from said original image therefore providing said estimated background image.
Claim 34
Dependent Claim
39 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 26 wherein said parameter estimation means comprises: means for computing image parameters such as mean, maximum and minimum values from said original image.
Claim 35
Dependent Claim
38 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 26 wherein said dynamic range remapping means further comprises: fusion means for fusing said remapped images together to form said output image.
Claim 36
Dependent Claim
39 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 26 wherein: said dynamic range remapping means takes out DC and slow-varying signal components from said original image independent of estimated background intensity.
Claim 37
Dependent Claim
43 words
A uniform and non-uniform dynamic range remapping system for optimum image display as claimed in claim 26 wherein: said multiplicative algorithm means compresses DC and slow-varying signal components and also makes signal contrast in bright regions smaller than signal contrast in dark regions.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-11-09 | 2002-05-11 | 2002-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-11-09 | 2006-05-11 | 2006-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-11-09 | 2010-05-11 | 2010-11-10 | $7700.00 | Window Closed / Lapsed |