Imaging Device False Color Correction via Luminance Ratio Adjustment
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Solution Overview
Problem
Existing imaging systems face challenges in suppressing false color when capturing scenes with local intense light sources, such as spotlights, due to difficulties in acquiring accurate color ratios and luminance values, particularly in RGBW-arranged color filter systems.
Innovation Solution
An imaging device with a signal processing unit that includes a luminance value acquisition unit and a color acquisition unit, which corrects luminance values in pixels with high color values relative to luminance values by adjusting them to match the ratios of adjacent pixels, thereby reducing false color effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If color filters with RGBW arrangement are used to increase sensitivity and luminance capture, then luminance sensitivity is improved, but false color occurs when local intense light enters specific color pixels
Solution Approach 1:
The patent applies preliminary action by detecting saturation in W pixels and RGB pixels before false color fully manifests, then proactively correcting color ratios and luminance values. The signal processing unit performs preliminary saturation detection and correction calculations to prevent false color artifacts in the final image output.
Solution Approach 2:
The patent changes parameters by dynamically adjusting color ratios and luminance values based on saturation detection. When saturation is detected in W or RGB pixels, the system modifies the color ratio parameters and luminance parameters to compensate for the saturation effect, thereby suppressing false color while maintaining luminance sensitivity.
2Productivity
If color ratios are calculated from single pixels to improve processing speed, then productivity is improved, but color ratio accuracy deteriorates under local intense light conditions
Solution Approach 1:
The patent applies segmentation by dividing the pixel array into regions and processing color ratios differently based on saturation detection. Instead of uniformly processing all pixels the same way, the system segments saturated and non-saturated regions, applying appropriate correction algorithms only where needed, thus maintaining speed while improving accuracy in problematic areas.
Solution Approach 2:
The patent uses partial action by applying complex correction algorithms only to pixels or regions where saturation is detected, rather than processing the entire image with full correction. This selective approach maintains high processing speed for non-saturated areas while applying necessary corrections only where accuracy is compromised by saturation.
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
The solution effectively suppresses false color occurrences and enhances color reproducibility in imaging systems by accurately interpolating color components and luminance values, even under conditions of local intense light exposure.
Implementation Method 1
an imaging element 100 having a plurality of pixels 12
Data Source
AI summary
An imaging device includes an imaging element including first pixels, each outputs a signal including color information, and second pixels having higher sensitivity than the first pixels, and a signal processing unit including a luminance value acquisition unit that acquires luminance values in the first pixels based on signals from the second pixels and a color acquisition unit that acquires color ratios by using color and luminance values in the first pixels. When a color value in the first pixels corresponding to one color is larger than a luminance value, the color acquisition unit corrects the luminance value in the first pixels corresponding to the one color so that a ratio of the color value and the luminance value in the first pixels corresponding to the one color is closer to a ratio of a color value and a luminance value in the first pixels corresponding to another color.