Color Reference Pattern Without Neutral Borders for Chrominance Evaluation
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Solution Overview
Problem
Conventional color reference charts for evaluating chrominance in video systems provide no visual representation of color values or hues between explicitly represented hues, leading to unintended color corrections in video images.
Innovation Solution
A color reference pattern comprising a plurality of saturated color samples arranged in an array without neutral borders between adjacent samples, allowing interpolation of color information between primary and secondary hues, and using a video vectorscope to evaluate and adjust chrominance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional color reference charts use neutral borders to separate color samples, then each color sample can be clearly identified and measured, but no visual representation of color values or hues between explicitly represented hues is provided
Solution Approach 1:
The color reference chart is segmented into discrete color samples arranged in a specific geometric pattern (e.g., alternating primary and secondary hues). This segmentation allows each color sample to be clearly identified and measured while the overall pattern provides information about intermediate hues through the spatial relationship between samples.
Solution Approach 2:
The patent transitions from representing only discrete color values to representing a continuous color space by arranging color samples in a two-dimensional pattern. This spatial arrangement adds a dimensional aspect where the position and relationship between samples convey information about intermediate hues that would otherwise be missing.
2Ease of operation
If color samples are separated by neutral borders, then color value evaluation is simplified, but unintended color corrections occur due to lack of intermediate hue information
Solution Approach 1:
The geometric pattern of color samples provides visual feedback about the completeness of color representation. By observing the pattern and the positions of color samples relative to each other, evaluators can determine whether intermediate hues are properly represented, preventing unintended color corrections.
Solution Approach 2:
The patent utilizes systematic color changes across the reference chart by arranging color samples in a pattern that progresses through different hues. This deliberate color arrangement allows evaluators to assess whether intermediate hues are accurately captured while maintaining ease of visual evaluation.
3Ease of manufacture
If discrete color samples with borders are used, then the reference chart structure is simple and easy to manufacture, but color information interpolation between primary and secondary hues is not enabled
Solution Approach 1:
The reference chart is divided into discrete, manufacturable color samples arranged in a specific pattern. This segmentation maintains manufacturing simplicity while the strategic arrangement of samples enables interpolation of intermediate color information through the spatial relationships between adjacent samples.
Solution Approach 2:
The color reference chart serves multiple functions: it provides discrete color samples for direct measurement and simultaneously provides a pattern that enables interpolation of intermediate hues. This multi-functionality is achieved through the geometric arrangement of samples without complicating the manufacturing process.
Data Source
AI summary
In one example, a color reference chart for evaluating a chrominance signal of a video image includes a plurality of color samples arranged in an array, wherein the plurality of color samples comprises: a first color sample of a first known, non-neutral hue and saturation and a second color sample of a second known, non-neutral hue and saturation positioned so that at least a portion of the second color sample is directly adjacent to at least a portion of the first color sample, and a barrier of a known neutral color positioned directly adjacent to the plurality of color samples without separating the at least a portion of the second color sample from the at least a portion of the first color sample.