Color Calibration Database for Print Medium Feedback Control
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Solution Overview
Problem
Conventional color calibration methods for printing devices, particularly electrophotographic printers, face challenges in determining the necessity of feedback adjustments for color correction LUTs across various paper types, leading to improper judgments and inefficiencies in maintaining constant color balance and accuracy.
Innovation Solution
A control program and device system that creates a database associating white-ground color differences with resulting color accuracies for specific paper types, allowing for a mathematical relation to be established, enabling proper judgment on the necessity of feedback adjustments for color correction LUTs based on the calculated white-ground color difference and representative color differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If feedback adjustment is performed repeatedly for all paper types, then color calibration accuracy is improved, but processing time and operational complexity increase
Solution Approach 1:
The system pre-calculates and stores the relationship between white-ground color differences and resulting color accuracies in a database during system initialization or calibration setup. This preliminary action allows the control device to quickly determine whether feedback adjustment is necessary by simply querying the database with the measured white-ground color difference, avoiding the need to perform repeated feedback adjustments for all paper types while maintaining accurate color calibration decisions
Solution Approach 2:
The patent replaces the mechanical/repeated trial-and-error feedback adjustment process with an information-based decision system. By substituting physical repeated adjustments with database queries and mathematical comparisons, the system efficiently determines whether feedback adjustment is necessary without actually performing the time-consuming adjustment process unless truly needed
2Manufacturing precision
If feedback adjustment is performed for every paper type, then color accuracy is improved, but device complexity and operational difficulty increase
Solution Approach 1:
The system extracts the essential relationship between white-ground color differences and color accuracy outcomes from multiple paper type calibrations and stores it in a database. This extraction allows the complex feedback adjustment decision-making process to be simplified into a straightforward database lookup and comparison operation, reducing operational complexity while maintaining color accuracy
Solution Approach 2:
The patent introduces a database as an intermediary between the color measurement system and the feedback adjustment process. This intermediary stores pre-analyzed relationships and enables intelligent decision-making without requiring complex real-time calculations or repeated adjustments, thereby simplifying the overall system operation while preserving color accuracy
3Ease of operation
If conventional feedback adjustment methods are used without paper-type-specific data, then operational simplicity is maintained, but color calibration accuracy deteriorates
Solution Approach 1:
The system changes the operational parameter from uniform feedback adjustment for all paper types to parameter-based decision making using white-ground color difference values. By measuring and comparing this specific parameter against database thresholds, the system achieves accurate, paper-type-appropriate feedback adjustment decisions while maintaining operational simplicity through automated parameter comparison
Data Source
AI summary
Provided are a non-transitory computer-readable storage medium storing a control program for creating a database for use in color calibration and that storing a control program for a judgement based on the database. The control programs cause a computing device to perform the following operations. The database-creating operations include calculating a white-ground color difference using a print medium, and repeating a feedback adjustment of a color correction LUT, to obtain a resulting color accuracy. The operations further include obtaining white-ground color differences and resulting color accuracies for plural paper products of a certain print medium type, to obtain a mathematical relation and create a database. The judgement operations include using the database to calculate an estimated resulting color accuracy from a white-ground color difference calculated using a print medium, and judging whether to perform a feedback adjustment of a color correction LUT based on the estimated resulting color accuracy.