Transmission Color Gradation Chart for Imaging Calibration
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Solution Overview
Problem
Conventional color gradation charts experience color shift issues when brightness is reduced, leading to inaccurate color calibration in imaging devices, as the chromaticity position shifts on the xy chromaticity diagram, necessitating a more precise method for color calibration.
Innovation Solution
A transmission type color gradation chart is developed, comprising a color chart member with chromatic color bars and a gray gradation chart member with achromatic transmission regions, stacked to overlap in planar view, allowing for precise adjustment of color and brightness, with features like black colorants, light shielding dots, and spacers to prevent chromatic distortion and light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a conventional color gradation chart uses RGB value design with brightness reduction, then the chart can display color gradation, but color shift occurs and chromaticity position shifts on xy chromaticity diagram
Solution Approach 1:
The color gradation chart is divided into two separate members: a color chart member containing color bars with chromatic colors, and a gray gradation chart member containing transmission regions with different brightness levels. This segmentation allows independent optimization of color accuracy and brightness control, preventing color shift when brightness is adjusted.
Solution Approach 2:
The invention transitions from a single-plane color chart to a stacked multi-layer structure where the color chart member and gray gradation chart member are positioned at different depths. This dimensional change enables the overlapping of color bars and transmission regions in planar view while maintaining physical separation, allowing precise control of both chromaticity and brightness independently.
2Measurement precision
If the color chart member and gray gradation chart member are stacked to overlap in planar view, then precise color and brightness adjustment is enabled, but the structure becomes more complex
Solution Approach 1:
The stacked structure serves multiple functions simultaneously: the color chart member provides chromatic color reference, the gray gradation chart member provides brightness reference, and their overlapping region enables combined color-brightness calibration. This multi-functionality justifies the increased structural complexity by delivering comprehensive calibration capabilities in a single device.
3Device complexity
If a single color gradation chart is used, then the structure is simple, but it cannot accurately control both color and brightness independently
Solution Approach 1:
The calibration chart is segmented into specialized functional members: the color chart member dedicated to chromatic color display and the gray gradation chart member dedicated to brightness control. This segmentation enables independent control of color and brightness parameters, providing adaptability for precise calibration while maintaining relatively simple individual member structures.
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 solution enables accurate color calibration of imaging devices by maintaining chromaticity position stability even at reduced brightness, preventing noise and chromatic distortion, and allowing for precise adjustment of color and brightness.
Implementation Method 1
a gray gradation chart member wherein transmitted light exhibits achromatic color, and includes a plurality of transmission regions with different brightness
Implementation Method 2
a color chart member including, at least one color bar wherein transmitted light exhibits chromatic color
Implementation Method 3
a spacer is preferably placed between the color chart member and the gray gradation chart member, and the spacer preferably includes an opening portion in the duplicative transmission region. The reason therefor is to suppress appearance of a Newton's ring due to occurrence of a gap
Data Source
AI summary
A transmission type color gradation chart comprising: a color chart member including at least one color bar wherein transmitted light exhibits chromatic color; and a gray gradation chart member wherein transmitted light exhibits achromatic color, and includes a plurality of transmission regions with different brightness, wherein the color chart member and the gray gradation chart member are stacked so that there is a duplicative transmission region wherein the color bar and the plurality of transmission regions overlap in planar view.