Color Correction Device Using Dynamic Matrix Coefficients
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Solution Overview
Problem
Conventional color correction devices require manual selection of modes based on light sources, leading to potential incorrect color correction and inability to capture natural colors when the appropriate mode is forgotten or mistakenly selected, especially under LED light sources with narrow-band wavelengths.
Innovation Solution
A color correction device that automatically adjusts color correction coefficients using a linear matrix circuit and color difference matrix circuit to ensure natural color representation, regardless of the light source type, by modifying correction coefficients based on differences between R, G, and B signals to match the spectral characteristics of the light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional color correction device uses fixed correction modes for different light sources, then color correction can be achieved under wide-band light sources, but the device cannot automatically adapt to narrow-band LED light sources and requires manual mode selection
Solution Approach 1:
The color correction device automatically detects the light source type and applies appropriate correction coefficients without requiring manual user input. The system monitors the image capturing signal characteristics and self-adjusts the correction parameters to match the detected light source spectrum.
Solution Approach 2:
The device dynamically changes correction coefficients based on the detected light source type. Different correction coefficient sets are applied for wide-band light sources versus narrow-band LED light sources, allowing the system to adapt to different spectral characteristics through parameter modification.
2Manufacturing precision
If the device uses standard color correction coefficients for wide-band light sources, then natural color representation is achieved under sunlight or halogen lamps, but color distortion occurs under LED light sources with narrow-band wavelengths
Solution Approach 1:
The color correction system transitions from static, fixed correction coefficients to dynamic, adaptable coefficients that change based on the detected light source type. This allows the system to optimize color correction for each specific lighting condition rather than using a one-size-fits-all approach.
Solution Approach 2:
The system modifies correction coefficients as parameters based on the light source spectrum characteristics. Different coefficient values are selected or generated corresponding to different light source types (wide-band vs. narrow-band), enabling accurate color representation across diverse lighting conditions.
3Reliability
If the device automatically detects and adjusts correction coefficients, then color accuracy improves across all light sources, but the device complexity increases due to additional detection and adjustment mechanisms
Solution Approach 1:
The system incorporates feedback by monitoring the characteristics of the image capturing signal to determine the light source type. Based on this feedback, the system automatically selects or generates appropriate correction coefficients, creating a closed-loop control mechanism that ensures accurate color correction.
Solution Approach 2:
The color correction device performs self-detection and self-adjustment of correction coefficients without external intervention. The system independently analyzes the input signal characteristics and autonomously applies the necessary corrections, reducing the need for complex external control mechanisms.
Data Source
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AI summary
A linear matrix circuit (6) generates a second R signal, a second G signal, and a second B signal by performing a matrix operation of a correction coefficient of 3 rows × 3 columns including first to third correction coefficients, fourth to sixth correction coefficients, and seventh to ninth correction coefficients on a first R signal, a first G signal, and a first B signal that are generated by the image capturing device capturing an image of a subject. An R coefficient corrector (13) performs correction so that the first correction coefficient to be multiplied by the first R signal is caused to be close to 1 and the second and third correction coefficients to be respectively multiplied by the first G signal and the first B signal are caused to be close to 0, as a first difference value obtained by subtracting the first G signal from the first B signal increases when the first difference value exceeds a first threshold.