Methods and apparatus for color calibration and verification
First Claim
1. A method of calibrating a color measuring instrument with a color standard and verifying said color standard and said calibration, said method comprising:
- providing a color standard having a surface with at least two different colors arranged for a simultaneous color measurement;
calibrating said instrument with said color standard; and
verifying that said color standard used in calibration is an authorized color standard of a predetermined specification and that the calibration of the color measurement instrument has achieved predetermined specified results, said steps of calibrating and verifying being performed by either sequential (1) exclusion and inclusion or (2) inclusion and exclusion of predetermined color measurement values of a portion of said color standard.
3 Assignments
0 Petitions
Accused Products
Abstract
Methods and apparatus for calibrating a color measuring instrument with a color standard and verifying the color standard and calibration are provided. One method includes providing a color standard having a surface with at least two different colors (preferably arranged for a simultaneous color measurement), calibrating the instrument, and verifying that said color standard is an authorized color standard of a predetermined specification and that the calibration of the color measuring instrument has achieved predetermined specified results. Some of the provided methods and apparatus use a photosensitive portion of the color standard that changes color in a known way when exposed to a predetermined dose of light. Various color standards for use with this invention are provided.
135 Citations
225 Claims
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1. A method of calibrating a color measuring instrument with a color standard and verifying said color standard and said calibration, said method comprising:
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providing a color standard having a surface with at least two different colors arranged for a simultaneous color measurement;
calibrating said instrument with said color standard; and
verifying that said color standard used in calibration is an authorized color standard of a predetermined specification and that the calibration of the color measurement instrument has achieved predetermined specified results, said steps of calibrating and verifying being performed by either sequential (1) exclusion and inclusion or (2) inclusion and exclusion of predetermined color measurement values of a portion of said color standard. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 74)
providing a color standard having a first of said colors characterized by a first predetermined coloration having premeasured color measurement value(s) and a second of said colors characterized by a second predetermined coloration having premeasured color measurement value(s).
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3. The method of claim 2 wherein said calibrating comprises:
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measuring at least a first known and predetermined portion of said color standard surface to obtain preliminary calibration color measurement value(s);
adjusting the instrument output to correspond to previously established calibrations, using said portion of said color standard;
remeasuring said portion of said color standard to obtain calibration color measurement value(s); and
comparing said calibration color measurement value(s) with a calibration'"'"'s premeasured color measurement value(s) for the same known and predetermined portion of said color standard surface to ensure that said calibration color measurement value(s) and said calibration'"'"'s premeasured color measurement value(s) is substantially the same and therefore to ensure that calibration has achieved predetermined specified results.
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4. The method of claim 3 wherein said verifying comprises:
measuring at least a second known and predetermined portion of said color standard surface to obtain verification color measurement value(s), and determining that said verification color measurement value(s) is substantially equal to a verification'"'"'s premeasured color measurement value(s) for the same known and predetermined portion of the said color standard surface.
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5. The method of claim 2 wherein said providing comprises providing a color standard wherein said at least two colors of predetermined coloration are disposed on said color standard surface in a known ratio of surface areas.
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6. The method of claim 2 wherein said providing comprises providing a color standard wherein said at least two colors of predetermined coloration are disposed on said color standard surface in a known configuration of surface areas.
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7. The method of claim 6 wherein said providing comprises providing a color standard wherein said at least two colors of predetermined coloration are disposed on said color standard surface with a known radial disposition.
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8. The method of claim 7 wherein said providing comprises providing a color standard wherein said first color of predetermined coloration is on a central region that is centrally located on said standard surface and wherein said second color of predetermined coloration is disposed on an outer region that is radially outside said central region.
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9. The method of claim 8 wherein said providing comprises providing a color standard wherein said second color of predetermined coloration is disposed on an annular region of said standard surface.
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10. The method of claim 8 wherein said providing comprises providing a color standard wherein said centrally located region has a surface area that is larger than a surface area of said annular region.
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11. The method of claim 6 wherein said providing comprises providing a color standard wherein said first color of predetermined coloration is disposed on at least two noncontiguous regions on said color standard surface.
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12. The method of claim 11 wherein said providing comprises providing a color standard wherein said second color of predetermined coloration is disposed on at least two additional noncontiguous regions on said color standard surface.
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13. The method of claim 12 wherein said providing comprises providing a color standard wherein said colors of predetermined coloration on said standard surface have a mottled appearance.
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14. The method of claim 6 wherein said providing comprises providing a color standard wherein said first color of predetermined coloration is disposed on at least two contiguous regions on said color standard surface.
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15. The method of claim 4 wherein said measuring a first known portion comprises masking said second known portion with a mask.
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16. The method of claim 15 wherein said calibrating comprises measuring a first known portion wherein said first known portion is a region on which said first color of predetermined coloration is disposed.
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17. The method of claim 16 wherein said verifying comprises measuring a second known portion wherein said second known portion is a region on which said second color of predetermined coloration is disposed.
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18. The method of claim 15 wherein said verifying comprises measuring a second known portion wherein said second known portion is a portion on which said first color of predetermined coloration and said second color of predetermined coloration are disposed.
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19. The method of claim 15 wherein said verifying comprises measuring a second known portion consisting essentially of a region on which said second color of predetermined coloration is disposed.
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20. The method of claim 15 wherein said verifying comprises measuring a second known portion consisting essentially of a portion on which a predetermined combination of said first color of predetermined coloration and said second color of predetermined coloration is disposed.
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21. The method of claim 15 wherein said calibrating comprises measuring a first known portion wherein said first known portion is a region on which said second color of predetermined coloration is disposed.
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22. The method of claim 21 wherein said verifying comprises measuring a second known portion wherein said second known portion is a region on which Salid first color of predetermined coloration is disposed.
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23. The method of claim 21 wherein said verifying comprises measuring a second known portion wherein said second known portion is a portion on which said first color of predetermined coloration and said second color of predetermined coloration are disposed.
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24. The method of claim 21 wherein said verifying comprises measuring a second known portion consisting essentially of a portion on which said first color of predetermined coloration is disposed.
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25. The method of claim 21 wherein said verifying comprises measuring a second known portion, consisting essentially of a portion on which a predetermined combination of said first color of predetermined coloration and said second color of predetermined coloration is disposed.
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26. The method of claim 15 wherein said calibrating comprises measuring a first known portion wherein said first known portion is a portion on which said first color of predetermined coloration and said second color of predetermined coloration are disposed.
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27. The method of claim 15 wherein said calibrating comprises measuring a first known portion, wherein said first known portion is selected from a group consisting essentially of a portion on which said first color of predetermined coloration is disposed, a portion on which said second color of predetermined coloration is disposed, and a portion on which a predetermined combination of said first color of predetermined coloration and said second color of predetermined coloration is disposed.
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28. The method of claim 27 wherein said calibrating comprises measuring a first known portion consisting essentially of a portion on which said first color of predetermined coloration is disposed.
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29. The method of claim 27 wherein said calibrating comprises measuring a first known portion consisting essentially of a portion on which said second color of predetermined coloration is disposed.
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30. The method of claim 27 wherein said calibrating comprises measuring a first known portion consisting essentially of a portion on which said predetermined combination is disposed.
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31. The method of claim 15 wherein said mask has an aperture, said measuring a first known portion comprises positioning said mask adjacent said color standard surface so that-said first known portion is measurable and said second known portion is not measurable.
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32. The method of claim 31 wherein said first known portion is one of a plurality of calibration portions disposed on said color standard surface and said mask has a plurality of operable positions that correspond to said calibration portions, and wherein said positioning comprises positioning said mask in one of said plurality of operable positions to select one of said calibration portions.
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33. The method of claim 4 wherein said measuring a second known portion comprises masking said first known portion with a mask.
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34. The method of claim 33 wherein said verifying comprises measuring a second known portion wherein said second known portion is a region on which said first color of predetermined coloration is disposed.
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35. The method of claim 33 wherein said verifying comprises measuring a second known portion wherein said second known portion is a region on which said second color of predetermined coloration is disposed.
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36. The method of claim 33 wherein said verifying comprises measuring a second known portion wherein said second known portion is a portion on which said first color of predetermined coloration and said second color of predetermined coloration are disposed.
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37. The method of claim 33 wherein said verifying comprises measuring a second known portion, wherein said second known portion is selected from a group consisting essentially of a portion on which said first color of predetermined coloration is disposed, a portion on which said second color of predetermined coloration is disposed, and a portion on which a predetermined combination of said first color of predetermined coloration and said second color of predetermined coloration is disposed.
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38. The method of claim 37 wherein said verifying comprises measuring a second known portion consisting essentially of a portion on which said first color of predetermined coloration is disposed.
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39. The method of claim 37 wherein said verifying comprises measuring a second known portion consisting essentially of a portion on which said second color of predetermined coloration is disposed.
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40. The method of claim 37 wherein said verifying comprises measuring a second known portion consisting essentially of a portion on which said predetermined combination is disposed.
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41. The method of claim 36 wherein said mask has an aperture, said measuring a second known portion comprises positioning said mask adjacent said color standard surface so that said second known portion is measurable and said first known portion is not measurable.
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42. The method of claim 41 wherein said second known portion is one of a plurality of calibration portions disposed on said color standard surface and said mask has a plurality of operable 1) positions that correspond to said calibration portions, and wherein said positioning comprises positioning said mask in one of said operable positions to select one of said calibration portions.
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43. The method of claim 4 wherein said first known portion and said second known portion are the same.
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44. The method of claim 43 wherein said determining that said verification color measurement value(s) is substantially equal comprises:
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calculating computed color measurement value(s) based on said verification color measurement value(s); and
determining that said computed color measurement value(s) are substantially equal to said verification'"'"'s premeasured color measurement value(s).
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45. The method of claim 44 wherein said first known portion is selected from a group consisting essentially of a portion on which said first color is disposed, a portion on which said second color is disposed, and a portion on which a predetermined combination of said first color of predetermined coloration and said second color of predetermined coloration is disposed.
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46. The method of claim 45 wherein said calculating computed color measurement value(s) comprises adding predetermined differential color measurement value(s) to said verification color measurement value(s) to obtain said computed color measurement value(s).
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47. The method of claim 46 wherein said predetermined differential color measurement value(s) is at least partially based on said first predetermined coloration'"'"'s premeasured color measurement value(s), said second predetermined colorations'"'"'s premeasured color measurement value(s), or a combination thereof.
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48. The method of claim 45 wherein said determining of said calculated color measurement value(s) comprises subtracting said predetermined differential color measurement value(s) from said verification color measurement value(s) to obtain said computed color measurement value(s).
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49. The method of claim 48 wherein said first known portion consists essentially of a portion on which said predetermined combination of said first color of predetermined coloration and said second color of predetermined coloration is disposed, and wherein said predetermined differential color measurement value(s) is at least partially based on said first predetermined coloration'"'"'s premeasured color measurement value(s).
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50. The method of claim 48 wherein said first known portion consists essentially of a portion on which said predetermined combination of said first color of predetermined coloration and said second color of predetermined coloration is disposed, and wherein said predetermined differential color measurement value(s) are at least partially based on said second predetermined coloration'"'"'s premeasured color measurement value(s).
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51. The method of claim 4 wherein said providing a color standard comprises providing a color standard having at least two different colors, a first of said colors being disposed on a first surface of said color standard and being characterized by a first predetermined coloration having premeasured color measurement value(s) and a second of said colors being disposed on a second surface of said color standard and being characterized by a second predetermined coloration having premeasured color measurement value(s).
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52. The method of claim 51 wherein said measuring a first known portion comprises measuring at least said first known and predetermined portion of said first surface of said color standard to obtain said calibration color measurement value(s).
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53. The method of claim 51 wherein said measuring a second known portion comprises measuring at least said second known and predetermined portion of said second surface of said color standard to obtain said verification color measurement value(s).
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54. The method of claim 51 wherein said color standard first surface and said color standard second surface are separable.
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55. The method of claim 51 wherein said color standard first surface and said color standard second surface are inseparable.
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56. The method of claim 55 wherein said inseparable first and second surfaces are disposed on opposite sides of a flat substrate.
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57. The method of claim 1 wherein said color measuring instrument has a head with a window, said providing a color standard comprises providing a color standard having at least two different colors arranged for a simultaneous color measurement within said window.
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58. The method of claim 57 wherein said window has a substantially round shape, said providing a color standard comprises providing a color standard having at least two different colors arranged for a simultaneous color measurement within said substantially round window.
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59. The method of claim 1 wherein said at least two different colors includes a first color having a first surface area and a second color having a second surface area, said providing comprises providing a color standard wherein said first surface area is substantially larger than said second surface area.
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60. The method of claim 1 wherein said providing comprises:
providing a color standard having a first color that is characterized by a first predetermined coloration having premeasured color measurement value(s) and a second color that is photosensitive.
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61. The method of claim 60 wherein said calibrating comprises measuring a known and predetermined portion of said color standard to obtain calibration color measurement value(s), and wherein said verifying comprises measuring said portion to obtain verification color measurement value(s), said method further comprising:
exposing at least said second color to a predetermined dose of light for verification after calibration such that said calibration color measurement value(s) and said verification color measurement value(s) are different.
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62. The method of claim 60 wherein said first color has a first surface area and said second color has a second surface area, said providing comprises providing a color standard wherein said first surface area is larger than said second surface area.
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63. The method of claim 62 wherein said providing comprises providing a color standard wherein said first surface area is substantially larger than said second surface area.
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64. The method of claim 60 wherein said calibrating comprises measuring a known and predetermined portion of said color standard to obtain calibration color measurement value(s), and wherein said verifying comprises measuring said portion to obtain verification color measurement value(s), said method further comprising:
exposing at least said second color to a predetermined dose of light after said calibrating such that said calibration color measurement value(s) and said verification color measurement value(s) are different.
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65. The method of claim 1 wherein said providing comprises providing a color standard that is substantially opaque to said light.
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74. The method of claim 17 wherein said window has a substantially round shape, said providing a color standard comprises providing a color standard having at least two different colors arranged for a simultaneous color measurement within said substantially round window.
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66. A method of calibrating a color measuring instrument with a color standard and verifying said color standard and said calibration, said method comprising:
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providing a color standard having a surface with at least a first region and a second region, wherein said first region has a first color characterized by a first predetermined coloration having premeasured color measurement value(s), and wherein said second region is photosensitive so that it changes color in a known way when exposed to a predetermined dose of light, the change in color distinguishing the so exposed color standard from a color standard that has not been so exposed;
calibrating said instrument with said color standard;
exposing at least said second region with light; and
verifying that said color standard used in calibration is an authorized color standard of a predetermined specification and that the calibration of the color measurement instrument has achieved predetermined specified results. - View Dependent Claims (67, 68, 69, 70, 71, 72, 73, 75)
providing a color standard having said first color characterized by a first predetermined coloration having premeasured color measurement value(s) and a second color characterized by a second predetermined coloration having premeasured color measurement value(s).
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68. The method of claim 67 wherein said calibrating comprises:
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measuring at least a first known and predetermined portion of said color standard surface to obtain preliminary calibration color measurement value(s);
adjusting the instrument output to correspond to previously established calibrations, using said portion of said color standard;
remeasuring said portion of said color standard to obtain calibration color measurement value(s); and
comparing said calibration color measurement value(s) with a calibration'"'"'s premeasured color measurement value(s) for the same known and predetermined portion of said color standard surface to ensure that said calibration color measurement value(s) and said calibration'"'"'s premeasured color measurement value(s) is substantially the same and therefore to ensure that calibration has achieved predetermined specified results.
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69. The method of claim 68 wherein said verifying comprises:
measuring at least a second known and predetermined portion of said color standard surface to obtain verification color measurement value(s), and determining that said verification color measurement value(s) is substantially equal to a verification'"'"'s premeasured color measurement value(s) for the same known and predetermined portion of the said color standard surface.
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70. The method of claim 66 wherein said calibrating comprises at least measuring a known and predetermined portion of said color standard to obtain calibration color measurement value(s), wherein said verifying comprises at least measuring said portion to obtain verification color measurement value(s), and wherein said exposing comprises exposing at least said second region to said predetermined dose of light for verification after calibration such that said calibration color measurement value(s) and said verification color measurement value(s) are different.
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71. The method of claim 66 wherein at least one of said calibrating and verifying comprises measuring the color of said portion, wherein said portion comprises said first region and said second region, wherein said first region has a first surface area and said second region has a second surface area, said first surface area being larger than said second surface area.
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72. The method of claim 66 wherein said providing comprises providing a color standard having a surface with at least two different colors arranged for a simultaneous color measurement.
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73. The method of claim 66 wherein said color measuring instrument has a head with a window, said providing a color standard comprises providing a color standard having at least two different colors arranged for a simultaneous color measurement within said window.
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75. The method of claim 66 wherein said providing comprises providing a color standard that is substantially opaque to light.
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76. A method for calibration of a color measuring instrument and verification of the calibration using a color calibration and verification apparatus, said apparatus comprising:
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a color standard having a substantially opaque surface with at least two different colors arranged for simultaneous color measurement to sequentially calibrate the instrument with first predetermined color measurement value(s) of the color standard and verify the calibration with at least second and different predetermined color measurement value(s) of the color standard, and variance means to provide said first and second different color measurement values, said variance means being selected from the group consisting of;
(1) sequential inclusion and exclusion of predetermined color measurement value(s) of a portion of said colors, (2) sequential exclusion and inclusion of predetermined color measurement value(s) of a portion of said colors, and (3) sequential exposure of photosensitive paper or material which provides at least one of said colors or portion of at least one of said colors, said photosensitive paper or material being capable of changing color in a known way when exposed to a predetermined dose of light, the chance in color distinguishing the so exposed color standard from a color standard that has not been so exposed, said method comprising the steps of;
calibrating said instrument with said first predetermined color measurement value(s) of the color standard;
causing the variance means to provide at least second and different predetermined color measurement value(s) of the color standard; and
verifying the calibration of the color measurement instrument with said at least second and different predetermined color measurement value(s) of the color standard.
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77. A method for calibrating a color measuring instrument and verifying the calibration of said instrument, said method comprising:
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(a) providing a color standard having a substantially opaque surface with at least two different colors arranged for simultaneous color measurement;
(b) sequentially calibrating the instrument with first predetermined color measurement value(s) of the color standard and verifying the calibration with at least second and different predetermined color measurement value(s) of the color standard;
(c) providing variance means to provide said first and second different color measurement values, said variance means being selected from the group consisting of;
(1) sequential inclusion and exclusion of at least the predetermined color measurement value(s) of a portion of said colors, (2) sequential exclusion and inclusion of at least the predetermined color measurement value(s) of the portion of said colors, and (3) sequential exposure of photosensitive paper or material which provides at least one of said colors or region or portion of said colors, said photosensitive paper or material being capable of changing color in a known way when exposed to a predetermined dose of light, the chance in color distinguishing the so exposed color standard from a color standard that has not been so exposed;
(d) calibrating said instrument with said first predetermined color measurement value(s) of the color standard;
(e) causing the variance means to provide at least second and different predetermined color measurement value(s) of the color standard; and
(f) verifying the calibration of the color measurement instrument with said at least second and different predetermined color measurement value(s) of the color standard.
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- 78. A color calibration and verification apparatus for calibrating and verifying a color measuring instrument, said apparatus comprising a color standard having at least two different colors, wherein a first of said colors is characterized by a first predetermined coloration having premeasured color measurement value(s) and wherein a second of said colors is characterized by a second predetermined coloration having premeasured color measurement value(s), said second of said colors being photosensitive so that said second color changes color in a known way when exposed to a predetermined dose of light, the change in color distinguishing the so exposed color standard from such a color standard that has not been so exposed.
- 139. A color calibration and verification apparatus for calibrating and verifying a color measuring instrument, said apparatus comprising a color standard having a surface with at least a first region and a second region, wherein said first region has a first color characterized by a first predetermined coloration having premeasured color measurement value(s), and wherein said second region is photosensitive so that said second region changes color in a known way when exposed to a predetermined dose of light, the change in color distinguishing the so exposed color standard from a color standard that has not been so exposed.
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145. A color calibration and verification apparatus for calibrating and verifying a color measuring instrument, said apparatus comprising:
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a color standard having a first surface and a second surface, said first surface having at least a first region characterized by a first predetermined coloration having premeasured color measurement value(s); and
a photosensitive layer having a first surface and a second surface, said first surface of said photosensitive layer having a second region that is photosensitive so that said second region changes color in a known way when exposed to a predetermined dose of light, the change in color distinguishing the so exposed color standard from a color standard that has not been so exposed. - View Dependent Claims (146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158)
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- 159. A color calibration and verification apparatus for a color measuring instrument, said apparatus comprising a color standard having a substantially opaque back surface and an additional surface that has at least one section with at least two different colors arranged for a simultaneous color measurement, a first of said colors being characterized by a first predetermined coloration having premeasured color measurement value(s) and a second of said colors being characterized by a second predetermined coloration having premeasured color measurement value(s) and being photosensitive so that it changes color in a known way when exposed to a predetermined dose of light, the change in color distinguishing the so exposed color standard from a color standard that has not been so exposed.
- 190. A color calibration and verification apparatus for a color measuring instrument, said apparatus comprising a color standard having a substantially opaque back surface and at least one section having at least two different colors arranged for a simultaneous color measurement, wherein a first of said colors is characterized by a first predetermined coloration having premeasured color measurement value(s) and wherein a second of said color is capable of changing color in a known way when exposed to a predetermined dose of light, the change in color distinguishing the so exposed color standard from a color standard that has not been so exposed, and characterized by a second predetermined coloration having premeasured color measurement value(s), said at least two colors of predetermined coloration are disposed on at least one of a first and a second color standard surfaces.
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221. A color calibration and verification apparatus for calibration of a color measuring instrument and verification of the calibration, said apparatus comprising:
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a color standard having a substantially opaque surface with at least two different colors arranged for simultaneous color measurement to sequentially calibrate the instrument with first predetermined color measurement value(s) of the color standard and verify the calibration with at least second and different predetermined color measurement value(s) of the color standard; and
variance means to provide said first and at least second different color measurement values, said variance means being selected from the group consisting of;
(1) means for sequential inclusion and exclusion of predetermined color measurement value(s) of a portion of said colors, (2) means for sequential exclusion and inclusion of predetermined color measurement value(s) of a portion of said colors, and (3) means for sequential exposure of photosensitive paper or material which provides at least one of said colors or portion of at least one of said colors, said photosensitive paper or material being capable of changing color in a known way when exposed to a predetermined dose of light, the change in color distinguishing the so exposed color standard from a color standard that has not been so exposed.- View Dependent Claims (222, 223, 224)
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225. A color standard for color calibration of a color measuring instrument and verification that said color standard used in calibration is an authorized color standard of a predetermined specification and that the calibration of the color measurement instrument has achieved predetermined specified results, wherein said standard comprises:
a surface with at least two different colors arranged for a simultaneous color measurement by said color measuring instrument, and wherein said color standard is capable of being used to so calibrate and verify by either sequential (1) exclusion and inclusion or (2) inclusion and exclusion of predetermined color measurement values of a portion of said color standard.
Specification