Three-Dimensional Color Table Rescaling for Thermal Imaging
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Solution Overview
Problem
Thermal imaging printing devices face challenges in controlling energy transfer between image-forming layers, leading to undesired activation and degradation of image quality due to crosstalk, which affects color accuracy and gamut representation.
Innovation Solution
Implementing a three-dimensional color table instead of one-dimensional primary activation curves, where color patches are printed and measured to determine peak chroma nodes, and energy profiles are rescaled to reduce crosstalk and improve color calibration, using a method that involves printing color ramps and measuring them with a colorimeter or spectrophotometer to generate a fully populated target color table.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one-dimensional primary activation curves are used for color management in thermal imaging printing devices, then the device complexity is reduced, but color accuracy and gamut representation deteriorate due to crosstalk between image-forming layers
Solution Approach 1:
The patent transitions from one-dimensional primary activation curves to three-dimensional color tables that incorporate multiple color components (cyan, magenta, yellow, and black channels). This dimensional expansion allows the system to account for interactions between different color layers, thereby reducing crosstalk and improving color accuracy while maintaining manageable complexity through systematic organization of the color data.
2Speed
If energy profiles are not rescaled, then the processing speed is maintained, but color calibration deteriorates due to crosstalk between adjacent image-forming layers
Solution Approach 1:
The patent applies parameter changes by rescaling energy profiles based on measured crosstalk characteristics. The system determines peak chroma nodes through printing and measuring color ramps, then adjusts energy distribution parameters to compensate for inter-layer interference. This parameter optimization reduces crosstalk and improves color calibration while maintaining efficient processing through pre-calculated correction factors.
3Productivity
If color ramps are not printed and measured, then the productivity is maintained, but measurement precision of color output deteriorates
Solution Approach 1:
The patent implements preliminary action by pre-printing color ramps and measuring color patches to establish accurate color profiles before actual printing operations. The system uses these preliminary measurements to determine peak chroma nodes and create comprehensive three-dimensional color tables, which are then stored for rapid lookup during production. This preliminary characterization enables both high measurement precision and maintained productivity through efficient data reuse.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces crosstalk, enhances color accuracy, and improves the gamut representation by rescaling energy profiles, resulting in better control over color production and reduced variability in thermal imaging printing devices.
Implementation Method 1
Thermal imaging printing devices face challenges in controlling energy transfer between image-forming layers
Implementation Method 2
controlling energy transfer between image-forming layers, leading to undesired activation
Data Source
AI summary
A color table is modulated. The color table includes a plurality of nodes, and each node corresponds with a color input in the first color space and provides a print output in a second color space. The set of the plurality of nodes are arranged in a vector of a first color perception parameter. The vector can be arranged according to an order of increasing second color perception parameter in the first color space to an end node of the set of the plurality of nodes. A node in the set of the plurality of nodes that provides a peak amount of the second color perception parameter on the medium is determined. The print output for the end node is replaced with a print output corresponding with the node that provides the peak amount of the second color perception parameter on the medium.