US6809838B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transforms for display or printing digital images
Assignee: Monument Peak Ventures LLC
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Filing: 2000-10-19
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Granted: 2004-10-26
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Expires: 2020-10-19
Abstract
Abstract A method for constructing a transform for a predetermined display or printer, such printer or display being adapted to form a color image, on a particular medium, with extended chroma values while maintaining existing luminance values, the input to the transform including an input color digital image produced by a particular image capture device, the method includes providing a luminance reproduction curve in response to the input color digital image which, for any input luminance value, will produce an output luminance value, the luminance reproduction curve being selected to preserve highlight and midtone contrast, and shadow detail from the input color digital image; providing a plurality of selective luminance independent chromatic reproduction curves in response to the input color digital image which, for any input chroma value, will produce an output chroma value; and the chromatic reproduction curves being selected so that each curve is a function of the visual density range of the display or medium and the image chroma values wherein small chroma values remain unchanged and large chroma values are modified to extend chroma values while maintaining existing luminance values for a particular device or medium whereby a user can select one or more of the chromatic reproduction curves which, in combination with the luminance reproduction curve, produces color digital images so that a selected printer or display can form a color image, on a particular medium, with extended chroma values.
Inventors
- 👤 Paul B. Gilman
- 👤 John F. Hamilton, Jr.
- 👤 Edward J. Giorgianni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:20
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/6097; H04N1/6077; H04N1/608
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
235 words
A method for constructing a nonlinear transform for a predetermined display or printer, such printer or display being adapted to form a color image, on a particular medium, the input to the transform including an input color digital image produced by a particular image capture device, the method comprising the steps of: a) providing a luminance reproduction curve in response to the input color digital image which, for any input luminance value, will produce an output luminance value, the luminance reproduction curve being selected to preserve highlight and midtone contrast, and shadow detail from the input color digital image; b) providing a plurality of chromatic reproduction curves, which are luminance independent, in response to the input color digital image which, for any input chroma value, will produce an output chroma value; and c) the chromatic reproduction curves being selected so that each curve is a function of the visual density range of the display or medium and the image chroma values, wherein small chroma values remain unchanged and large chroma values are modified to increase or decrease chroma values while maintaining existing luminance values for a particular device or medium whereby a user can select one or more of the chromatic reproduction curves which, in combination with the luminance reproduction curve, produces color digital images so that a selected printer or display can form a color image, on a particular medium, with modified chroma values.
Claim 2
Independent Claim
235 words
A method for constructing a nonlinear transform for a predetermined display or printer, such printer or display being adapted to form a color image, on a particular medium, the input to the transform including an input color digital image produced by a particular image capture device, the method comprising the steps of: a) providing a luminance reproduction curve in response to the input color digital image which, for any input luminance value, will produce an output luminance value, the luminance reproduction curve being selected to preserve highlight and midtone contrast, and shadow detail from the input color digital image; b) providing a plurality of chromatic reproduction curves, which are luminance independent, in response to the input color digital image which, for any input chroma value, will produce an output chroma value; and c) the chromatic reproduction curves being selected so that each curve is a function of the visual density range of the display or medium and the image chroma values, wherein small chroma values remain unchanged and large chroma values are modified to increase or decrease chroma values while maintaining existing luminance values for a particular device or medium whereby a user can select one or more of the chromatic reproduction curves which, in combination with the luminance reproduction curve, produces color digital images so that a selected printer or display can form a color image, on a particular medium, with modified chroma values.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein the chromatic reproduction curves are selected to modify colors in particular portions of a color space.
Claim 4
Dependent Claim
25 words
The method of claim 1 wherein the contrast of the shoulder of each of the chromatic reproduction curves is gradually increased to reduce viewing flare.
Claim 5
Dependent Claim
40 words
The method of claim 1 wherein, when the transform is for a printer, further including using the transform to produce a desired number of prints from a printer which uses the particular print medium for which the transform is configured.
Claim 6
Dependent Claim
23 words
The method of claim 1 wherein the image capture device is a digital camera and the particular medium is a thermal print medium.
Claim 7
Dependent Claim
13 words
The method of claim 1 wherein the printer is an ink jet printer.
Claim 8
Dependent Claim
12 words
The method of claim 1 wherein the printer is an electrophotographic printer.
Claim 9
Dependent Claim
12 words
The method of claim 1 wherein the display is an OLED display.
Claim 10
Dependent Claim
9 words
A transform made in accordance with claim 1 .
Claim 11
Independent Claim
373 words
A method for constructing a nonlinear transform for a predetermined display or printer, such printer or display being adapted to form a color image, on a particular medium, the input to the transform including an input color digital image produced by a particular image capture device, the method comprising the steps of: a) providing a luminance reproduction curve in response to the input color digital image which, for any input luminance value, will produce an output luminance value, the luminance reproduction curve being selected to preserve highlight and midtone contrast, and shadow detail from the input color digital image; b) providing a plurality of selective luminance independent chromatic reproduction curves in response to the input color digital image which, for any input chroma value, will produce an output chroma value; and c) the chromatic reproduction curves being selected so that each curve is a function of the visual density range of the display or medium and the image chroma values wherein small chroma values remain unchanged and large chroma values are modified so as to satisfies the following relationship: G ( x )= F ( x )+ B ( F ( x )) wherein: F(x) is a conventional chromatic reproduction scale and wherein x is an image chroma value; and B(F(x)) is a boost function, which satisfies the relationship: B ( y ) = [ 0 if y < y 0 - h Tan ( θ ) 4 h [ y - ( y 0 - h ) 2 ] if y 0 - h ≤ y ≤ y 0 + h Tan ( θ ) ( y - y 0 ) if y 0 - h < y in which: y denotes any chroma value; y 0 denotes a particular chroma value; θ denotes a particular angle of inclination, positive or negative; and h denotes a particular small increment of chroma value, and whereby a user can select one or more of the chromatic reproduction curves which, in combination with the luminance reproduction curve, produces color digital images so that a selected printer or display can form a color image, on a particular medium, with enhanced or diminished chroma values.
Claim 12
Independent Claim
373 words
A method for constructing a nonlinear transform for a predetermined display or printer, such printer or display being adapted to form a color image, on a particular medium, the input to the transform including an input color digital image produced by a particular image capture device, the method comprising the steps of: a) providing a luminance reproduction curve in response to the input color digital image which, for any input luminance value, will produce an output luminance value, the luminance reproduction curve being selected to preserve highlight and midtone contrast, and shadow detail from the input color digital image; b) providing a plurality of selective luminance independent chromatic reproduction curves in response to the input color digital image which, for any input chroma value, will produce an output chroma value; and c) the chromatic reproduction curves being selected so that each curve is a function of the visual density range of the display or medium and the image chroma values wherein small chroma values remain unchanged and large chroma values are modified so as to satisfies the following relationship: G ( x )= F ( x )+ B ( F ( x )) wherein: F(x) is a conventional chromatic reproduction scale and wherein x is an image chroma value; and B(F(x)) is a boost function, which satisfies the relationship: B ( y ) = [ 0 if y < y 0 - h Tan ( θ ) 4 h [ y - ( y 0 - h ) 2 ] if y 0 - h ≤ y ≤ y 0 + h Tan ( θ ) ( y - y 0 ) if y 0 - h < y in which: y denotes any chroma value; y 0 denotes a particular chroma value; θ denotes a particular angle of inclination, positive or negative; and h denotes a particular small increment of chroma value, and whereby a user can select one or more of the chromatic reproduction curves which, in combination with the luminance reproduction curve, produces color digital images so that a selected printer or display can form a color image, on a particular medium, with enhanced or diminished chroma values.
Claim 13
Dependent Claim
22 words
The method of claim 2 wherein the chromatic reproduction curves are selected to modify colors in particular portions of a color space.
Claim 14
Dependent Claim
25 words
The method of claim 2 wherein the contrast of the shoulder of each of the chromatic reproduction curves is gradually increased to reduce viewing flare.
Claim 15
Dependent Claim
40 words
The method of claim 2 wherein, when the transform is for a printer, further including using the transform to produce a desired number of prints from a printer which uses the particular print medium for which the transform is configured.
Claim 16
Dependent Claim
23 words
The method of claim 2 wherein the image capture device is a digital camera and the particular medium is a thermal print medium.
Claim 17
Dependent Claim
13 words
The method of claim 2 wherein the printer is an ink jet printer.
Claim 18
Dependent Claim
12 words
The method of claim 2 wherein the printer is an electrophotographic printer.
Claim 19
Dependent Claim
12 words
The method of claim 2 wherein the display is an OLED display.
References Cited (Backward Citations)
US4792518A
Cited
US5225867A
Cited
US5300381A
Cited
US5729360A
Cited
US6374027B1
Cited
US6477271B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2007-10-26 | 2008-04-26 | 2008-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-10-26 | 2012-04-26 | 2012-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-10-26 | 2016-04-26 | 2016-10-26 | $7700.00 | Window Closed / Lapsed |