Color measurement and calibration
First Claim
Patent Images
1. A system for determining a color match, comprising:
- a database storing color definitions, each having a unique RGB value;
a template card comprising at least one reference scale;
a memory for storing pre-determined calibration RGB values corresponding to the at least one reference scale; and
a processor configured to;
receive a first image of the template card and color sample,process the first image and output a sample RGB value corresponding to the color sample and at least one reference scale RGB value,apply color correction to the sample RGB value based on a difference between the at least one reference scale RGB value and a corresponding calibration RGB value of the at least one reference scale to produce a color corrected sample RGB value, andcompare the color corrected sample RGB value with the RGB values of the color definitions stored within the database to determine a color match.
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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.
40 Citations
47 Claims
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1. A system for determining a color match, comprising:
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a database storing color definitions, each having a unique RGB value; a template card comprising at least one reference scale; a memory for storing pre-determined calibration RGB values corresponding to the at least one reference scale; and a processor configured to; receive a first image of the template card and color sample, process the first image and output a sample RGB value corresponding to the color sample and at least one reference scale RGB value, apply color correction to the sample RGB value based on a difference between the at least one reference scale RGB value and a corresponding calibration RGB value of the at least one reference scale to produce a color corrected sample RGB value, and compare the color corrected sample RGB value with the RGB values of the color definitions stored within the database to determine a color match. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for matching colors, comprising:
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arranging a template card comprising at least one reference scale adjacent to a color sample of unknown color; obtaining a first image of the template card and the color sample; determining a sample RGB value of the color sample and at least one reference RGB value from the first image to produce a determined sample RGB value; applying color correction to the determined sample RGB value based on a difference between the at least one reference RGB value and corresponding calibration RGB values of the at least one reference scale to produce a color corrected sample RGB value, and comparing the color corrected sample RGB value with RGB values of a plurality of color definitions stored within a database to determine a color match. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A system for color determination, comprising:
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a database storing color definitions, each having a unique RGB value; one or more template cards, each comprising at least one reference scale and at least one reference color; and a processor configured to; receive one or more images of the template cards and one or more known color samples, process the images, output known sample RGB values and at least one reference color RGB value, store the at least one reference color RGB value as a calibration RGB value matrix for color correction, compare the output known sample RGB values with the RGB values of corresponding color definitions stored within the database; and perform a least squares fit of the output known sample RGB values to the corresponding color definition RGB values to generate coefficients of a transform function for transforming output RGB values into corresponding color definition RGB values. - View Dependent Claims (43, 44)
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45. A method for color determination, comprising:
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obtaining one or more images of template cards and one or more known color samples, outputting known sample RGB values and at least one reference color RGB value, storing the at least one reference color RGB value as a calibration RGB value matrix for color correction, comparing the output known sample RGB values with RGB values of corresponding color definitions stored within a database; and performing a least squares fit of the output known sample RGB values to the corresponding color definition RGB values to generate coefficients of a transform function for transforming output RGB values into corresponding color definition RGB values. - View Dependent Claims (46, 47)
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Specification