Color Conversion Table Ripple Adjustment for Accuracy

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Solution Overview

Problem

Existing color conversion tables face accuracy issues when the number of colors in the output color system exceeds the number of colors in the input color system, leading to non-unique determinations and decreased color reproducibility in printed results.

Innovation Solution

A method for creating and adjusting color conversion tables by calculating adjustment amounts for specific grid points, determining ripple amounts for peripheral grid points, and applying these amounts to improve the correspondence between input and output color systems, ensuring accurate color reproduction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the number of colors in the output color system is greater than the number of colors in the input color system, then the color conversion table can represent more colors, but the output value with respect to an input value cannot be uniquely determined

Engineering Contradiction:

Improvecolor representation capabilityVSAvoidoutput value determination accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent changes the parameter of output values by introducing ripple amounts that adjust output values based on their distance from a reference grid point. This allows the system to handle the many-to-one mapping problem by systematically varying output values according to spatial relationships in the color space, enabling unique determination despite the color system mismatch.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces an intermediary mechanism (ripple amount calculation based on distance from reference grid point) that mediates between the input color value and the multiple possible output color values. This intermediary approach allows the system to select a unique output value by considering the spatial relationship in color space, thus resolving the non-uniqueness problem while maintaining adaptability.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If the output value of a specific grid point is adjusted to improve color accuracy, then the color reproduction accuracy improves, but the values of peripheral grid points become inconsistent

Engineering Contradiction:

Improvecolor reproduction accuracyVSAvoidcolor conversion table consistency

Core Design Contradiction:

Measurement precisionVSStability of the object's composition

Solution Approach 1:

The patent applies local quality by adjusting output values differently based on their location relative to the reference grid point. The ripple amount is calculated based on distance, creating a localized adjustment pattern where grid points closer to the reference point receive different adjustments than those farther away. This maintains overall consistency while improving local accuracy.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent introduces dynamics by making the adjustment amount variable rather than fixed. The ripple amount changes dynamically based on the distance from the reference grid point, creating a gradient effect that smoothly transitions from the reference point outward. This dynamic approach maintains consistency across the entire color conversion table while allowing localized optimization.

Inventive Principle:

Principle #15Dynamics

3Reliability

If the correspondence relationship between input and output color systems is adjusted to improve accuracy, then color reproducibility improves, but the complexity of the adjustment process increases

Engineering Contradiction:

Improvecolor reproducibilityVSAvoidadjustment process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs feedback by using the measured color values from the color chart to determine adjustment amounts for the color conversion table. The process takes the actual printed color measurements, compares them with expected values, and uses the difference (ripple amount) to adjust the conversion table. This feedback mechanism improves reliability while keeping the process systematic and manageable.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent applies preliminary action by pre-calculating ripple amounts based on distance from reference grid points before finalizing the color conversion table. This preliminary calculation of adjustment amounts based on spatial relationships simplifies the overall process by establishing a systematic approach to adjustments before the actual color matching is finalized.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS10812684B2Color conversion table creation by adjusting output value of specific grid point in reference color conversion table and calculating prorogation to peripheral grid point

Publication Date: 2020.10.20 SEIKO EPSON CORP

AI summary

A color conversion table creation method includes creating a reference color conversion table using a color value of a color chart, and adjusting a color conversion table by adjusting an output value of a specific grid point corresponding to a predetermined input value in the created reference color conversion table, in which the adjusting the color conversion table includes an adjustment amount calculation step of calculating an adjustment amount of the output value of the specific grid point, a ripple amount determination step of determining a ripple amount when the calculated adjustment amount propagates with respect to a peripheral grid point existing in a vicinity of the specific grid point, and an application step of applying the determined ripple amount to the peripheral grid point in the color conversion table.