Signal Processing Apparatus for Image Quality Optimization
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Solution Overview
Problem
In existing imaging devices, the synthesis ratio for combining visible and infrared light signals is based on visible light luminance, leading to decreased color reproducibility and image quality when the infrared light signal is stronger, resulting in deteriorated image quality.
Innovation Solution
A signal processing device and method that create a mixture ratio for mixing low-frequency visible and infrared light signals based on their relative strengths, adjusting the ratio to prioritize either signal or set it equal, and adding high-frequency components to improve image quality, using filters and noise reduction units to generate and process these signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the synthesis ratio is determined on the basis of the visible light luminance signal, then the image signal can be generated by synthesizing visible and infrared light signals, but the color reproducibility decreases when the infrared light signal value is larger than the visible light signal value
Solution Approach 1:
The patent changes the basis for determining the mixture ratio from visible light luminance signal to low frequency signal. This parameter change ensures that when infrared light signal is stronger, the low frequency component comparison provides a more accurate basis for mixing ratio determination, preventing excessive infrared signal mixing and maintaining color reproducibility while ensuring reliable image quality
Solution Approach 2:
The patent separates the visible light signal and infrared light signal into low frequency components and high frequency components. By determining the mixture ratio based on low frequency components and then adding high frequency components, the system achieves better control over color reproducibility and image quality
Data Source
AI summary
To prevent deterioration in image quality in mixing a visible light signal and an infrared light signal to generate a color image signal. A signal processing device includes a mixture ratio creator and a mixer. The mixture ratio creator is configured to create a mixture ratio that is a ratio in mixing a low frequency visible light signal that is a low frequency component of a visible light signal and a low frequency invisible light signal that is a low frequency component of an invisible light signal together on a basis of the low frequency visible light signal and the low frequency invisible light signal. The mixer is configured to mix the low frequency visible light signal and the low frequency invisible light signal together on a basis of the mixture ratio to generate a mixed signal.