Data hiding for spot colors in product packaging
First Claim
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1. A method comprising:
- obtaining color data representing a spot color ink;
accessing a table to obtain data representing a process color ink tint, the process color ink tint including at least a Cyan (C) component, a Magenta (M) component and a Yellow component (Y);
simulating an overprinting of the process ink tint with the color data;
decomposing the process ink tint into a maximum signal tweak and a minimum signal tweak, each of the maximum signal tweak and the minimum signal tweak having a Cyan (C) component, a Magenta (M) component and a Yellow component (Y);
controlling one or more processors for minimizing a color error metric of the overprinting relative to the data representing the spot color ink, and optimizing the maximum signal tweak and the minimum signal tweak according to at least a spectral dependency;
in which the optimizing includes determining color weights and a global signal strength, the color weights to be applied to the process color tint and the global signal strength for regulating a modulating process, wherein the modulating modulates the process color ink tint with the maximum signal tweak and the minimum signal tweak to represent an information signal; and
outputting the modulated process color ink tint for overprinting with the color data.
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Abstract
The present disclosure relates generally to data hiding for product packaging and other printed objects. One embodiment embeds an information signal in a spot color for product packaging. The spot color is screened, and overprinted with process color tint. The tint is modulated prior to overprinting with optimized signal tweaks. The optimization can include consideration of a detector spectral dependency (e.g., red and/or green illumination). Other embodiments and combinations are described in the subject patent document.
137 Citations
12 Claims
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1. A method comprising:
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obtaining color data representing a spot color ink; accessing a table to obtain data representing a process color ink tint, the process color ink tint including at least a Cyan (C) component, a Magenta (M) component and a Yellow component (Y); simulating an overprinting of the process ink tint with the color data; decomposing the process ink tint into a maximum signal tweak and a minimum signal tweak, each of the maximum signal tweak and the minimum signal tweak having a Cyan (C) component, a Magenta (M) component and a Yellow component (Y); controlling one or more processors for minimizing a color error metric of the overprinting relative to the data representing the spot color ink, and optimizing the maximum signal tweak and the minimum signal tweak according to at least a spectral dependency; in which the optimizing includes determining color weights and a global signal strength, the color weights to be applied to the process color tint and the global signal strength for regulating a modulating process, wherein the modulating modulates the process color ink tint with the maximum signal tweak and the minimum signal tweak to represent an information signal; and outputting the modulated process color ink tint for overprinting with the color data.
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2. A system for encoding information for a printed article comprising:
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memory for storing i) data representing a first color (S1), ii) data representing second color data (S2), and iii) data representing third color data (S3), in which encoded information is provided by modulating the data representing third color data (S3) with max (positive) and min (negative) tweaks; one or more processors configured for; determining a color error between a Si and a combination of S2 and S3, the combination including the max and min tweaks; determining an information modulating error associated with the max and min tweaks; and optimizing the combination of S2 and S3, including minimizing the color error and minimizing the information modulating error; and an output for providing the optimized combination of S2 and S3 for use in a design to be printed on the printed article. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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10. A method for generating a design for a printed article comprising:
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minimizing;
i) a color match error between a first color S1 and a combination of data representing second color data (S2) and data representing third color data (S3), the combination including auxiliary encoded information in the data representing third color data, and ii) an information modulating error associated with modulations of the third color data (S3) that carry the auxiliary encoded information,said minimizing being constrained by a spectral component associated with an anticipated information detector, in which said minimizing yields color percentage values associated with at least the data representing third color data (S3) and a signal strength value for regulating the modulations; and outputting the color percentage values and signal strength value for use in a design to be printed on the printed article. - View Dependent Claims (11, 12)
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Specification