Printer Recalibration Using Visual Test Graphics
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Solution Overview
Problem
Existing printer recalibration methods require expensive colorimetric measuring equipment and technical expertise, making them impractical for environments that need frequent recalibration, such as those producing digitally watermarked photo ID cards.
Innovation Solution
A method for recalibrating printers using test graphics printed on target substrates, where an operator assesses visibility of contrasting features to adjust stored calibration data, potentially aided by internal sensors or software, allowing for quick recalibration without specialized equipment or expertise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If colorimetric measuring equipment is used for printer recalibration, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses a visual copy or representation of the test graphic printed on the substrate. Instead of directly measuring physical colorimetric properties, the system creates a visual copy that can be assessed by the operator or sensor, simplifying the measurement process while maintaining calibration accuracy
Solution Approach 2:
The patent replaces expensive, complex colorimetric measuring equipment with simpler, more accessible assessment methods. The test graphic itself acts as a disposable assessment tool that can be printed and evaluated without requiring sophisticated measurement instrumentation
2Manufacturing precision
If colorimetric measuring equipment and technical expertise are used for recalibration, then manufacturing precision is improved, but ease of operation deteriorates
Solution Approach 1:
The system enables operators to perform recalibration themselves using the visual test graphic assessment method. The test graphic provides self-evident visual indicators that allow operators to assess print quality and trigger recalibration without requiring specialized colorimetry knowledge or equipment
Solution Approach 2:
The patent utilizes visual color contrasts and transitions in the test graphic that are naturally perceptible to the human eye. By designing test patterns with specific color relationships (such as gray balance patches or contrast transitions), the system leverages human visual perception capabilities rather than requiring technical color measurement expertise
3Manufacturing precision
If prolonged recalibration procedures are used, then manufacturing precision is improved, but productivity deteriorates
Solution Approach 1:
The patent implements a quick assessment method using pre-designed test graphics that can be rapidly printed and evaluated. The test patterns are configured to provide immediate visual feedback on calibration status, allowing operators to quickly determine whether recalibration is needed without prolonged measurement procedures
Solution Approach 2:
The system performs a simplified, partial assessment using visual test graphic evaluation rather than comprehensive colorimetric measurement. This partial action approach provides sufficient calibration verification for most applications while significantly reducing the time and complexity required, with the option to perform more thorough calibration only when needed
Data Source
AI summary
A test pattern printed by a printer is assessed—without colorimetric equipment—to provide data used in recalibrating the printer. The assessment may be made by an unskilled operator, and can include discerning whether a particular pattern is visible in the printed test pattern, or whether a feature in the test pattern is relatively wider or narrower. From such assessment, needed changes to the printer's calibration data are inferred and implemented. A variety of other printer calibration techniques are disclosed. The technology is illustrated in the context of dye sublimation printers, and is particularly useful in optimizing printing of digitally-watermarked graphics.