Determining an optimal color space direction for selecting color modulations
First Claim
1. A method for operating a processor-controlled machine to determine, for a given input color, an optimal direction in color space that includes the given input color and that satisfies a set of constraints;
- the machine including an output device, a processor, and a memory device for storing data;
the data stored in the memory device including instruction data the processor executes to operate the machine;
the processor being connected to the memory device for accessing and executing the instruction data stored therein;
the method comprising;
obtaining an input color defined in coordinates of a multi-dimensional color space;
specifying an objective function that balances measurements of a human perceptual response and a digital image capture device response to a color change;
the color change being defined by a color space direction away from the input color;
the objective function simultaneously minimizing the human perceptual response measurement and maximizing the digital image capture device response measurement to the color change;
determining an output color defined as an optimal color space direction in the multi-dimensional color space away from the input color using the objective function;
encoding data as a pattern comprising one or more picture elements in an output color and one or more picture elements in the input color; and
outputting, on the output device, the encoded data such that the pattern is minimally visually perceptible to humans while, at the same time is maximally detectable by the digital image capture device.
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Abstract
This technique for determining an optimal color space direction for a respective input color mathematically models the determination of the color space direction as an optimization problem and uses models of human perception and scanner response that produce quantitative measurements of color changes. A given input color and a direction in color space away from the givien input color define a color change away from the input color. An objective function simultaneously minimizes the quantitative color difference of the color change measured by a human perception model and maximizes the color response difference of a scanner response model to find an optimal color space direction for the respective input color.
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Citations
7 Claims
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1. A method for operating a processor-controlled machine to determine, for a given input color, an optimal direction in color space that includes the given input color and that satisfies a set of constraints;
- the machine including an output device, a processor, and a memory device for storing data;
the data stored in the memory device including instruction data the processor executes to operate the machine;
the processor being connected to the memory device for accessing and executing the instruction data stored therein;
the method comprising;obtaining an input color defined in coordinates of a multi-dimensional color space; specifying an objective function that balances measurements of a human perceptual response and a digital image capture device response to a color change;
the color change being defined by a color space direction away from the input color;
the objective function simultaneously minimizing the human perceptual response measurement and maximizing the digital image capture device response measurement to the color change;determining an output color defined as an optimal color space direction in the multi-dimensional color space away from the input color using the objective function; encoding data as a pattern comprising one or more picture elements in an output color and one or more picture elements in the input color; and outputting, on the output device, the encoded data such that the pattern is minimally visually perceptible to humans while, at the same time is maximally detectable by the digital image capture device.
- the machine including an output device, a processor, and a memory device for storing data;
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2. A method for operating a processor-controlled machine to determine, for a given input color, an optimal direction in color space that includes the given input color and that satisfies a set of constraints;
- the machine including an output device, a processor, and a memory device for storing data;
the data stored in the memory device including instruction data the processor executes to operate the machine, the processor being connected to the memory device for accessing and executing the instruction data stored therein, the method comprising;obtaining an input color defined in coordinates of a multi-dimensional color space; specifying an objective function that balances measurements of a human perceptual response and a digital image capture device response to a color change, the color change being defined by a color space direction away from the input color, the objective function simultaneously minimizing the human perceptual response measurement and maximizing the digital image capture device response measurement to the color change; determining a range of output colors defined as optimal color space directions in the multi-dimensional color space away from the input color using the objective function; encoding data as a pattern comprising a plurality of picture elements in one or more output colors of the range of output colors; and outputting, on the output device, the encoded data such that the pattern is generally visually non-perceptible to humans while, at the same time is detectable by the digital image capture device. - View Dependent Claims (3, 4, 5, 6, 7)
- the machine including an output device, a processor, and a memory device for storing data;
Specification