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 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.
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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:
a template 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. 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. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A color identification system, comprising:
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a template comprising one or more full gray scale continuums, wherein the true intensity along each continuum is a function of geometric position on the template; an image obtaining device configured to obtain an image of an unknown color sample adjacent to the template; and color identification modules 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 intensities to determine the color of the unknown color sample.
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Specification