US6130756A
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US
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Method for characterizing a response function of an output
Assignee: Monument Peak Ventures LLC
•
Filing: 1998-03-12
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Granted: 2000-10-10
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Expires: 2018-03-12
Abstract
Abstract A method for characterizing a response function of an output device, the method comprises the steps of producing a test image on the output device with a set of one or more test patches having known code values; obtaining one or more captured images of the test image using a digital camera; determining colorimetric values for each of the test patches in the captured images using a known response function of the digital camera; and determining a response function of the output device which relates the known code values to the determined colorimetric values.
Inventors
- 👤 Barbara L. Grady
- 👤 Kevin E. Spaulding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:57
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/603; H04N1/6033
Claims Analysis
Total Claims: 66
Claim 1
Independent Claim
129 words
A method for characterizing a response function of an output device, the method comprising the steps of: (a) producing a test image on the output device with a set of one or more test patches having known code values; (b) obtaining one or more captured images of the test image using a digital camera; (c) determining colorimetric values for the test patches in the captured images using a known response function of the digital camera, wherein the known response function of the digital camera relates code values of the captured image to corresponding colorimetric values of the test image; (d) determining a response function of the output device which relates the known code values to the determined colorimetric values throughout the entire range of colors of the output device.
Claim 2
Independent Claim
129 words
A method for characterizing a response function of an output device, the method comprising the steps of: (a) producing a test image on the output device with a set of one or more test patches having known code values; (b) obtaining one or more captured images of the test image using a digital camera; (c) determining colorimetric values for the test patches in the captured images using a known response function of the digital camera, wherein the known response function of the digital camera relates code values of the captured image to corresponding colorimetric values of the test image; (d) determining a response function of the output device which relates the known code values to the determined colorimetric values throughout the entire range of colors of the output device.
Claim 3
Dependent Claim
20 words
The method as in claim 1 further comprising using either a video display or a printer as the output device.
Claim 4
Dependent Claim
31 words
The method as in claim 2 further comprising using any combination of an estimate of device non-linearity, white point, or colorant color to determine the response function of the output device.
Claim 5
Dependent Claim
34 words
The method as in claim 3 further comprising using a plurality of gray patches as the test patches when an estimate of device non-linearity is included in the response function of the output device.
Claim 6
Dependent Claim
30 words
The method as in claim 3 further comprising using a white patch as the test patch when the white point is included in the response function of the output device.
Claim 7
Dependent Claim
30 words
The method as in claim 3 further comprising using pure red, green and blue test patches when the colorant color is included in the response function of the output device.
Claim 8
Dependent Claim
28 words
The method of claim 1 wherein the step of determining the response function of the output device includes providing a one-dimensional non-linear function, and a color correction matrix.
Claim 9
Dependent Claim
23 words
The method of claim 1 wherein the step of determining the response function of the output device includes providing a three-dimensional look-up table.
Claim 10
Dependent Claim
23 words
The method of claim 1 wherein the step of determining the response function of the output device includes providing a multi-dimensional polynomial function.
Claim 11
Dependent Claim
21 words
The method of claim 1 wherein the step of determining the colorimetric values includes averaging test patch values from multiple images.
Claim 12
Dependent Claim
30 words
The method of claim 1 wherein the step of determining the response function of the output device includes combining the determined colorimetric values with known a priori output device characteristics.
Claim 13
Dependent Claim
22 words
The method of claim 11 wherein the known a priori output device characteristics include the colorimetric values of the output device colorants.
Claim 14
Dependent Claim
21 words
The method of claim 1 wherein steps (c) and (d) are performed using a microprocessor based unit inside the digital camera.
Claim 15
Dependent Claim
21 words
The method of claim 1 wherein steps (c) and (d) are perfonned using a microprocessor based unit inside the output device.
Claim 16
Dependent Claim
27 words
The method of claim 1, further including the step of determining a calibration function for the output device from the determined response function of the output device.
Claim 17
Dependent Claim
25 words
The method of claim 15 wherein the calibration function is used to correct the output device to make it substantially match a standard device response.
Claim 18
Dependent Claim
30 words
The method of claim 1, further including the step of modifying an image to be displayed on the output device according to the determined response function of the output device.
Claim 19
Dependent Claim
41 words
The method of claim 1, further including the step of determining a device profile for the output device from the determined response function of the output device, wherein the device profile is intended for use in for a color management system.
Claim 20
Dependent Claim
142 words
A computer program product for characterizing a response function of an output device, comprising a computer readable storage medium having a computer program stored thereon for performing the steps of: (a) producing a test image on the output device with a set of one or more test patches having known code values; (b) obtaining one or more captured images of the test image using a digital camera; (c) determining colorimetric values for the test patches in the captured images using a known response function of the digital camera, wherein the known response function of the digital camera relates code values of the captured image to corresponding colorimetric values of the test image; (d) determining a response function of the output device which relates the known code values to the determined colorimetric values throughout the entire range of colors of the output device.
Claim 21
Dependent Claim
142 words
A computer program product for characterizing a response function of an output device, comprising a computer readable storage medium having a computer program stored thereon for performing the steps of: (a) producing a test image on the output device with a set of one or more test patches having known code values; (b) obtaining one or more captured images of the test image using a digital camera; (c) determining colorimetric values for the test patches in the captured images using a known response function of the digital camera, wherein the known response function of the digital camera relates code values of the captured image to corresponding colorimetric values of the test image; (d) determining a response function of the output device which relates the known code values to the determined colorimetric values throughout the entire range of colors of the output device.
Claim 22
Dependent Claim
25 words
The computer program product as in claim 19 further comprising the step of using either a video display or a printer as the output device.
Claim 23
Dependent Claim
36 words
The computer program product as in claim 20 further comprising the step of using any combination of an estimate of device non-linearity, white point, or colorant color to determine the response function of the output device.
Claim 24
Dependent Claim
39 words
The computer program product as in claim 21 further comprising the step of using a plurality of gray patches as the test patches when an estimate of device non-linearity is included in the response function of the output device.
Claim 25
Dependent Claim
35 words
The computer program product as in claim 21 further comprising the step of using a white patch as the test patch when the white point is included in the response function of the output device.
Claim 26
Dependent Claim
35 words
The computer program product as in claim 21 further comprising the step of using pure red, green and blue test patches when the colorant color is included in the response function of the output device.
Claim 27
Dependent Claim
30 words
The computer program product of claim 19, wherein the step of determining the response function of the output device includes providing a one-dimensional non-linear function, and a color correction matrix.
Claim 28
Dependent Claim
25 words
The computer program product of claim 19, wherein the step of determining the response function of the output device includes providing a three-dimensional look-up table.
Claim 29
Dependent Claim
25 words
The computer program product of claim 19, wherein the step of determining the response function of the output device includes providing a multi-dimensional polynomial function.
Claim 30
Dependent Claim
23 words
The computer program product of claim 19, wherein the step of determining the colorimetric values includes averaging test patch values from multiple images.
Claim 31
Dependent Claim
32 words
The computer program product of claim 19, wherein the step of determining the response function of the output device includes combining the determined colorimetric values with known a priori output device characteristics.
Claim 32
Dependent Claim
24 words
The computer program product of claim 29, wherein the known a priori output device characteristics include the colorimetric values of the output device colorants.
Claim 33
Dependent Claim
23 words
The computer program product of claim 19, wherein steps (c) and (d) are performed using a microprocessor based unit inside the digital camera.
Claim 34
Dependent Claim
23 words
The computer program product of claim 19, wherein steps (c) and (d) are performed using a microprocessor based unit inside the output device.
Claim 35
Dependent Claim
29 words
The computer program product of claim 19, further including the step of determining a calibration function for the output device from the determined response function of the output device.
Claim 36
Dependent Claim
27 words
The computer program product of claim 33 wherein the calibration function is used to correct the output device to make it substantially match a standard device response.
Claim 37
Dependent Claim
32 words
The computer program product of claim 19, further including the step of modifying an image to be displayed on the output device according to the determined response function of the output device.
Claim 38
Dependent Claim
43 words
The computer program product of claim 19, further including the step of determining a device profile for the output device from the determined response function of the output device, wherein the device profile is intended for use in for a color management system.
Claim 39
Independent Claim
134 words
A system for characterizing a response function of an output device, the system comprising: (a) means for producing a test image on the output device with a set of one or more test patches having known code values; (b) means for obtaining one or more captured images of the test image using a digital camera; (c) means for determining colorimetric values for the test patches in the captured images using a known response function of the digital camera, wherein the known response function of the digital camera relates code values of the captured image to corresponding colorimetric values of the test image; (d) means for determining a response function of the output device which relates the known code values to the determined colorimetric values throughout the entire range of colors of the output device.
Claim 40
Independent Claim
134 words
A system for characterizing a response function of an output device, the system comprising: (a) means for producing a test image on the output device with a set of one or more test patches having known code values; (b) means for obtaining one or more captured images of the test image using a digital camera; (c) means for determining colorimetric values for the test patches in the captured images using a known response function of the digital camera, wherein the known response function of the digital camera relates code values of the captured image to corresponding colorimetric values of the test image; (d) means for determining a response function of the output device which relates the known code values to the determined colorimetric values throughout the entire range of colors of the output device.
Claim 41
Dependent Claim
19 words
The system as in claim 37 further comprising either a video display or a printer as the output device.
Claim 42
Dependent Claim
33 words
The system as in claim 38 further comprising means for using any combination of an estimate of device non-linearity, white point, or colorant color to determine the response function of the output device.
Claim 43
Dependent Claim
36 words
The system as in claim 39 further comprising means for using a plurality of gray patches as the test patches when an estimate of device non-linearity is included in the response function of the output device.
Claim 44
Dependent Claim
32 words
The system as in claim 39 further comprising means for using a white patch as the test patch when the white point is included in the response function of the output device.
Claim 45
Dependent Claim
32 words
The system as in claim 39 further comprising means for using pure red, green and blue test patches when the colorant color is included in the response function of the output device.
Claim 46
Dependent Claim
29 words
The system as in claim 37, wherein the means for determining the response function of the output device includes providing a one-dimensional non-linear function, and a color correction matrix.
Claim 47
Dependent Claim
23 words
The system of claim 37, wherein the means for determining the response function of the output device includes providing a three-dimensional look-up table.
Claim 48
Dependent Claim
23 words
The system of claim 37, wherein the means for determining the response function of the output device includes providing a multi-dimensional polynomial function.
Claim 49
Dependent Claim
21 words
The system of claim 37, wherein the means for determining the colorimetric values includes averaging test patch values from multiple images.
Claim 50
Dependent Claim
30 words
The system of claim 37, wherein the means for determining the response function of the output device includes combining the determined colorimetric values with known a priori output device characteristics.
Claim 51
Dependent Claim
22 words
The system of claim 37, wherein the known a priori output device characteristics include the colorimetric values of the output device colorants.
Claim 52
Dependent Claim
24 words
The system of claim 37, wherein means for performing elements (c) and (d) are performed using a microprocessor based unit inside the digital camera.
Claim 53
Dependent Claim
24 words
The system of claim 37, wherein means for performing elements (c) and (d) are performed using a microprocessor based unit inside the output device.
Claim 54
Dependent Claim
26 words
The system of claim 37, further including means for determining a calibration function for the output device from the determined response function of the output device.
Claim 55
Dependent Claim
25 words
The system of claim 51 wherein the calibration function is used to correct the output device to make it substantially match a standard device response.
Claim 56
Dependent Claim
29 words
The system of claim 37, further including means for modifying an image to be displayed on the output device according to the determined response function of the output device.
Claim 57
Dependent Claim
40 words
The system of claim 37, further including means for determining a device profile for the output device from the determined response function of the output device, wherein the device profile is intended for use in for a color management system.
Claim 58
Dependent Claim
58 words
The method as claimed in claim 1 wherein said known response function of the digital camera comprises a set of one-dimensional functions that transform the code values of the captured image into corresponding linear RGB signals, and a matrix operation that is used to transform the linear RGB signals into colormetric XYZ tristimulus values of the test image.
Claim 59
Dependent Claim
38 words
The method as claimed in claim 1 wherein said known response function of the digital camera comprises a three dimensional lookup table which relates code values of the captured image to corresponding colorimetric values of the test image.
Claim 60
Dependent Claim
37 words
The method as claimed in claim 1 wherein said known response function of the digital camera comprises a multi-dimensional polynomial function which relates code values of the captured image to corresponding colorimetric values of the test image.
Claim 61
Dependent Claim
60 words
The computer program product as claimed in claim 19 wherein said known response function of the digital camera comprises a set of one-dimensional functions that transform the code values of the captured image into corresponding linear RGB signals, and a matrix operation that is used to transform the linear RGB signals into colormetric XYZ tristimulus values of the test image.
Claim 62
Dependent Claim
40 words
The computer program product as claimed in claim 19 wherein said known response function of the digital camera comprises a three dimensional lookup table which relates code values of the captured image to corresponding colorimetric values of the test image.
Claim 63
Dependent Claim
39 words
The computer program product as claimed in claim 19 wherein said known response function of the digital camera comprises a multi-dimensional polynomial function which relates code values of the captured image to corresponding colorimetric values of the test image.
Claim 64
Dependent Claim
58 words
The system as claimed in claim 37 wherein said known response function of the digital camera comprises a set of one-dimensional functions that transform the code values of the captured image into corresponding linear RGB signals, and a matrix operation that is used to transform the linear RGB signals into colormetric XYZ tristimulus values of the test image.
Claim 65
Dependent Claim
38 words
The system as claimed in claim 37 wherein said known response function of the digital camera comprises a three dimensional lookup table which relates code values of the captured image to corresponding colorimetric values of the test image.
Claim 66
Dependent Claim
37 words
The system as claimed in claim 37 wherein said known response function of the digital camera comprises a multi-dimensional polynomial function which relates code values of the captured image to corresponding colorimetric values of the test image.
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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) | 2003-10-10 | 2004-04-10 | 2004-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-10-10 | 2008-04-10 | 2008-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-10-10 | 2012-04-10 | 2012-10-10 | $7700.00 | Window Closed / Lapsed |