Color Conversion Apparatus Flare Correction Table
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Solution Overview
Problem
The accuracy of color conversion in scanners is compromised due to differences in the level of flare between charts used for creating a scanner profile and those being converted, as the level of flare depends on the composition of the patches, including their color and size, leading to inaccuracies in color conversion.
Innovation Solution
A color conversion apparatus that creates a table of correction amounts for RGB values based on estimated flare levels and differences in RGB values and patch sizes, allowing it to correct measured RGB values from a second chart with different compositions to match the flare level of the chart used for creating the scanner profile, thereby improving color conversion accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a scanner profile is created using a first color chart with specific patch composition, then the scanner profile can accurately convert colors for that specific chart, but the profile becomes inaccurate when used with a second color chart having different patch composition due to flare level differences
Solution Approach 1:
The patent changes the parameters of the chart composition by creating a specific chart with controlled patch arrangements and color distributions. By adjusting the patch composition parameters (color values, patch sizes, spatial arrangements) to match the flare characteristics of the first chart, the system achieves consistent flare levels across different charts, thereby improving color conversion accuracy when using the scanner profile with various charts.
Solution Approach 2:
The patent performs preliminary action by creating a specific chart beforehand that is designed to produce the same flare level as the first color chart. This pre-designed chart serves as an intermediate reference that allows the scanner profile to be applied accurately to different charts. The specific chart is created in advance with optimized patch compositions that predict and control flare characteristics, enabling accurate color conversion before actual measurement takes place.
2Measurement precision
If the patch composition (color and size) of the first color chart is changed to create a specific chart, then the flare level can be matched to improve color conversion accuracy, but the complexity of chart creation and correction table generation increases
Solution Approach 1:
The patent segments the correction process into distinct components: (1) creating a specific chart with controlled patch compositions, (2) measuring both the first and specific charts to obtain RGB values, (3) calculating correction amounts based on differences between the charts, and (4) generating a separate correction table. This segmentation allows each step to be independently optimized and executed, managing the overall complexity while achieving accurate flare level matching for improved color conversion.
Data Source
AI summary
A color conversion apparatus includes a hardware processor that obtains a scanner profile created on the basis of measured RGB values and corresponding measured colorimetric values of patches in a first color chart, and creates a table including correction amounts of RGB values, each according to the level of flare estimated for a patch and each associated with an RGB-value difference and a patch-size difference, on the basis of RGB values of patches in the first color chart and RGB values of patches in a specific chart. The specific chart is created by using a part of the patches in the first color chart with the RGB value or patch size being changed. The hardware processor further corrects measured RGB values of patches in a second color chart with the table, and convers the corrected RGB values into colorimetric values with the scanner profile.