Color measurement and calibration
First Claim
Patent Images
1. A system for determining a true color of an unknown color sample, the system comprising:
- a template card including a cut-out and a plurality of concentric rings around the cut-out, each of the concentric rings having offset gray scales modulated as a function of an angle of a polar coordinate, wherein there is a trigonometric relationship between the gray scales of the plurality of concentric rings;
a RGB color processor configured to determine, in an image of the template card over the unknown color sample, a first radial cross-section of one of the concentric rings having an intensity that matches a determined average red color value of the image of the unknown color sample and to determine a true average red color value of the unknown color sample based on an intensity profile of the one of the concentric rings and a polar angle of the first radial cross-section; and
an angular processor configured to determine the polar angle of the first radial cross-section.
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Abstract
Embodiments described herein disclose a color measurement device and method for use with cameras or other imaging devices. The color measurement device may be configured to determine many different colors via a commonly owned device. Embodiments utilize sinusoidal grayscale rings to determine an exact color match of an unknown color, even if there is perspective distortion of an obtained image.
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Citations
19 Claims
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1. A system for determining a true color of an unknown color sample, the system comprising:
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a template card including a cut-out and a plurality of concentric rings around the cut-out, each of the concentric rings having offset gray scales modulated as a function of an angle of a polar coordinate, wherein there is a trigonometric relationship between the gray scales of the plurality of concentric rings; a RGB color processor configured to determine, in an image of the template card over the unknown color sample, a first radial cross-section of one of the concentric rings having an intensity that matches a determined average red color value of the image of the unknown color sample and to determine a true average red color value of the unknown color sample based on an intensity profile of the one of the concentric rings and a polar angle of the first radial cross-section; and an angular processor configured to determine the polar angle of the first radial cross-section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for determining a true color of an unknown color sample, the method comprising:
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obtaining an image wherein the image includes the unknown color sample and a template comprising a cut-out and a plurality of concentric rings around the cut-out, each of the plurality of concentric rings having offset gray scales modulated as a function of an angle of a polar coordinate and a trigonometric relationship existing between the gray scales of the plurality of concentric rings; determining a first radial cross-section of one of the concentric rings that matches a determined average red color value of the unknown color sample in the image; determining a polar angle of the first radial cross-section; and determining a true average red color value of the unknown color sample based on an intensity profile of the one of the concentric rings and the polar angle of the first radial cross-section; wherein the method is performed utilizing a camera. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A color identification system, comprising:
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a template card comprising one or more full gray scale continuums, wherein a true color intensity along each continuum is a function of geometric position on the template card; an image obtaining device configured to obtain an image of an unknown color sample adjacent to the template card; and color identification processors configured to determine geometric positions on the gray scale continuums in the image where their intensities match determined red, green, and blue color values of the image of the unknown color sample, and to use the determined geometric positions to determine the true color intensity of the gray scale continuum at each geometric position, and to use these true color intensities to determine the color of the unknown color sample.
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19. A color identification method, comprising:
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obtaining an image of an unknown color sample adjacent to a template comprising one or more full gray scale continuums, wherein a true intensity along each continuum is a function of geometric position on the template; determining geometric positions on the gray scale continuums in the image where intensity matches determined red, green, and blue color values of the image of the unknown color sample; determining the true intensity of the gray scale continuums at each geometric position based on the determined geometric positions; and determining the color of the unknown color sample based on these true intensities; wherein the method is performed utilizing a camera.
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Specification